From 577a8d333530aa368cc4ef682ae757b59f94618b Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 01:28:29 +0200
Subject: [PATCH 01/22] taking a stab...

---
 dev.py                                      |  54 +++-
 pyperformance/_venv.py                      |  22 +-
 pyperformance/requirements/requirements.txt |   8 +-
 pyperformance/tests/__init__.py             |  20 +-
 pyproject.toml                              |  12 +-
 requirements.in                             |   4 +-
 uv.lock                                     | 300 ++++++++++++++++++++
 7 files changed, 380 insertions(+), 40 deletions(-)
 create mode 100644 uv.lock

diff --git a/dev.py b/dev.py
index 3a6752ac..fffe568f 100644
--- a/dev.py
+++ b/dev.py
@@ -1,6 +1,8 @@
 # A script for running pyperformance out of the repo in dev-mode.
 
 import os.path
+import shutil
+import subprocess
 import sys
 
 REPO_ROOT = os.path.dirname(os.path.abspath(__file__))
@@ -29,8 +31,6 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
         readyfile = os.path.join(sys.prefix, "READY")
         isready = os.path.exists(readyfile)
     else:
-        import venv
-
         if not venvroot:
             venvroot = resolve_venv_root(kind, venvsdir)
         # Make sure the venv exists.
@@ -38,11 +38,28 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
         isready = os.path.exists(readyfile)
         if not isready:
             relroot = os.path.relpath(venvroot)
-            if not os.path.exists(venvroot):
-                print(f"creating venv at {relroot}...")
+            uv = shutil.which("uv")
+            if not uv:
+                sys.exit(
+                    "ERROR: uv executable not found. "
+                    "Install uv from https://astral.sh/uv and retry."
+                )
+            if os.path.exists(venvroot):
+                print(f"uv env {relroot} not ready, re-creating...")
+                shutil.rmtree(venvroot)
             else:
-                print(f"venv {relroot} not ready, re-creating...")
-            venv.create(venvroot, with_pip=True, clear=True)
+                print(f"creating uv env at {relroot}...")
+            result = subprocess.run(
+                [
+                    uv,
+                    "venv",
+                    "--python",
+                    sys.executable,
+                    venvroot,
+                ]
+            )
+            if result.returncode != 0:
+                sys.exit("ERROR: uv venv creation failed")
         else:
             assert os.path.exists(os.path.join(venvroot, "pyvenv.cfg"))
         # Return the venv's Python executable.
@@ -52,18 +69,31 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
 
     # Now make sure the venv has pyperformance installed.
     if not isready:
-        import subprocess
-
         relroot = os.path.relpath(venvroot)
-        print(f"venv {relroot} not ready, installing dependencies...")
+        print(f"uv env {relroot} not ready, installing dependencies...")
+        uv = shutil.which("uv")
+        if not uv:
+            sys.exit(
+                "ERROR: uv executable not found. "
+                "Install uv from https://astral.sh/uv and retry."
+            )
         proc = subprocess.run(
-            [python, "-m", "pip", "install", "--upgrade", "--editable", REPO_ROOT],
+            [
+                uv,
+                "pip",
+                "install",
+                "--python",
+                python,
+                "--upgrade",
+                "--editable",
+                f"{REPO_ROOT}[dev]",
+            ],
         )
         if proc.returncode != 0:
-            sys.exit("ERROR: install failed")
+            sys.exit("ERROR: uv pip install failed")
         with open(readyfile, "w"):
             pass
-        print("...venv {relroot} ready!")
+        print(f"...uv env {relroot} ready!")
 
     return venvroot, python
 
diff --git a/pyperformance/_venv.py b/pyperformance/_venv.py
index 73c0b989..b6bf4c28 100644
--- a/pyperformance/_venv.py
+++ b/pyperformance/_venv.py
@@ -2,6 +2,7 @@
 
 import os
 import os.path
+import shutil
 import sys
 import types
 
@@ -111,11 +112,24 @@ def create_venv(
 ):
     """Create a new venv at the given root, optionally installing pip."""
     already_existed = os.path.exists(root)
-    if withpip:
-        args = ["-m", "venv", root]
+    uv = shutil.which("uv")
+    if not uv:
+        print("ERROR: uv executable not found. Install uv from https://astral.sh/uv.")
+        raise VenvCreationFailedError(root, 127, already_existed)
+
+    if isinstance(python, str) or python is None:
+        target_python = python or sys.executable
     else:
-        args = ["-m", "venv", "--without-pip", root]
-    ec, _, _ = _utils.run_python(*args, python=python, env=env)
+        try:
+            target_python = python.sys.executable
+        except AttributeError as exc:
+            raise TypeError(f"expected python str, got {python!r}") from exc
+
+    argv = [uv, "venv"]
+    if target_python:
+        argv.extend(["--python", target_python])
+    argv.append(root)
+    ec, _, _ = _utils.run_cmd(argv, env=env)
     if ec != 0:
         if cleanonfail and not already_existed:
             _utils.safe_rmtree(root)
diff --git a/pyperformance/requirements/requirements.txt b/pyperformance/requirements/requirements.txt
index 644a4965..0770802c 100644
--- a/pyperformance/requirements/requirements.txt
+++ b/pyperformance/requirements/requirements.txt
@@ -1,9 +1,5 @@
-#
-# This file is autogenerated by pip-compile with Python 3.11
-# by the following command:
-#
-#    pip-compile --output-file=pyperformance/requirements/requirements.txt requirements.in
-#
+# This file was autogenerated by uv via the following command:
+#    uv pip compile -o requirements.txt requirements.in
 packaging==23.1
     # via -r requirements.in
 psutil==5.9.5
diff --git a/pyperformance/tests/__init__.py b/pyperformance/tests/__init__.py
index 2aa40f21..9f0a5858 100644
--- a/pyperformance/tests/__init__.py
+++ b/pyperformance/tests/__init__.py
@@ -75,16 +75,16 @@ def cleanup():
         def cleanup():
             return None
 
-    run_cmd(
-        python or sys.executable,
-        "-m",
-        "venv",
-        root,
-        capture=not verbose,
-        onfail="raise",
-        verbose=verbose,
-    )
-    return root, _resolve_venv_python(root), cleanup
+    uv = shutil.which("uv")
+    if not uv:
+        raise RuntimeError("uv executable is required to provision test environments")
+    argv = [uv, "venv"]
+    if python:
+        argv.extend(["--python", python])
+    argv.append(root)
+    run_cmd(*argv, capture=not verbose, onfail="raise", verbose=verbose)
+    venv_root = os.path.realpath(root)
+    return venv_root, _resolve_venv_python(venv_root), cleanup
 
 
 class CleanupFile:
diff --git a/pyproject.toml b/pyproject.toml
index 94e9ce07..aa8966b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,8 +1,7 @@
 # Update dependencies:
 #
-#  - python3 -m pip install --user --upgrade pip-tools build
 #  - git clean -fdx  # remove all untracked files!
-#  - (pip-compile --upgrade -o requirements.txt requirements.in)
+#  - uv pip compile --upgrade -o requirements.txt requirements.in
 #
 # Prepare a release:
 #
@@ -28,8 +27,8 @@
 #  - git tag VERSION
 #  - git push --tags
 #  - Remove untracked files/dirs: git clean -fdx
-#  - python -m build
-#  - twine upload dist/*
+#  - uv run python -m build
+#  - uvx twine upload dist/*
 #
 # After the release:
 #
@@ -65,8 +64,9 @@ classifiers = [
 ]
 dynamic = [ "version" ]
 dependencies = [
-  "packaging",
-  "pyperf",
+  "packaging==23.1",
+  "psutil==5.9.5",
+  "pyperf==2.9",
   "tomli; python_version<'3.11'",
 ]
 
diff --git a/requirements.in b/requirements.in
index 55f432ef..d682f417 100644
--- a/requirements.in
+++ b/requirements.in
@@ -12,7 +12,7 @@
 pyperf
 
 # for benchmark metadata:
-packaging
+packaging==23.1
 tomli; python_version < '3.11'
 
 
@@ -22,4 +22,4 @@ tomli; python_version < '3.11'
 # The list of optional dependencies is hardcoded in pyperformance/venv.py
 
 # XXX Do we still need this?
-psutil
+psutil==5.9.5
diff --git a/uv.lock b/uv.lock
new file mode 100644
index 00000000..f98dddff
--- /dev/null
+++ b/uv.lock
@@ -0,0 +1,300 @@
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+revision = 3
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From 3c6f1da29efe0dcb7a926551229857dd57079245 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 17:26:26 +0200
Subject: [PATCH 02/22] run_uv

---
 dev.py                  | 49 ++++++++++++++---------------------------
 pyperformance/_utils.py | 13 ++++++++++-
 pyperformance/_venv.py  | 15 +++++--------
 3 files changed, 34 insertions(+), 43 deletions(-)

diff --git a/dev.py b/dev.py
index fffe568f..9d87ae18 100644
--- a/dev.py
+++ b/dev.py
@@ -4,6 +4,7 @@
 import shutil
 import subprocess
 import sys
+from pyperformance import _utils
 
 REPO_ROOT = os.path.dirname(os.path.abspath(__file__))
 VENVS = os.path.join(REPO_ROOT, ".venvs")
@@ -38,27 +39,18 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
         isready = os.path.exists(readyfile)
         if not isready:
             relroot = os.path.relpath(venvroot)
-            uv = shutil.which("uv")
-            if not uv:
-                sys.exit(
-                    "ERROR: uv executable not found. "
-                    "Install uv from https://astral.sh/uv and retry."
-                )
             if os.path.exists(venvroot):
                 print(f"uv env {relroot} not ready, re-creating...")
                 shutil.rmtree(venvroot)
             else:
                 print(f"creating uv env at {relroot}...")
-            result = subprocess.run(
-                [
-                    uv,
-                    "venv",
-                    "--python",
-                    sys.executable,
-                    venvroot,
-                ]
+            ec, _, _ = _utils.run_uv(
+                "venv",
+                "--python",
+                sys.executable,
+                venvroot,
             )
-            if result.returncode != 0:
+            if ec != 0:
                 sys.exit("ERROR: uv venv creation failed")
         else:
             assert os.path.exists(os.path.join(venvroot, "pyvenv.cfg"))
@@ -71,25 +63,16 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
     if not isready:
         relroot = os.path.relpath(venvroot)
         print(f"uv env {relroot} not ready, installing dependencies...")
-        uv = shutil.which("uv")
-        if not uv:
-            sys.exit(
-                "ERROR: uv executable not found. "
-                "Install uv from https://astral.sh/uv and retry."
-            )
-        proc = subprocess.run(
-            [
-                uv,
-                "pip",
-                "install",
-                "--python",
-                python,
-                "--upgrade",
-                "--editable",
-                f"{REPO_ROOT}[dev]",
-            ],
+        ec, _, _ = _utils.run_uv(
+            "pip",
+            "install",
+            "--python",
+            python,
+            "--upgrade",
+            "--editable",
+            f"{REPO_ROOT}[dev]",
         )
-        if proc.returncode != 0:
+        if ec != 0:
             sys.exit("ERROR: uv pip install failed")
         with open(readyfile, "w"):
             pass
diff --git a/pyperformance/_utils.py b/pyperformance/_utils.py
index e0eaa5b2..50c90ee8 100644
--- a/pyperformance/_utils.py
+++ b/pyperformance/_utils.py
@@ -11,6 +11,8 @@
     "parse_name_pattern",
     "parse_selections",
     "parse_tag_pattern",
+    # tooling
+    "run_uv",
 ]
 
 
@@ -21,8 +23,8 @@
 import errno
 import os
 import os.path
-import shlex
 import shutil
+import shlex
 import subprocess
 import sys
 import tempfile
@@ -165,6 +167,15 @@ def run_python(*args, python=sys.executable, **kwargs):
     return run_cmd([python, *args], **kwargs)
 
 
+def run_uv(*args, env=None, capture=None, verbose=True):
+    uv = shutil.which("uv")
+    if not uv:
+        if verbose:
+            print("ERROR: uv executable not found. Install uv from https://astral.sh/uv.")
+        return 127, None, None
+    return run_cmd([uv, *args], env=env, capture=capture, verbose=verbose)
+
+
 #######################################
 # network utils
 
diff --git a/pyperformance/_venv.py b/pyperformance/_venv.py
index b6bf4c28..a4c675db 100644
--- a/pyperformance/_venv.py
+++ b/pyperformance/_venv.py
@@ -112,10 +112,6 @@ def create_venv(
 ):
     """Create a new venv at the given root, optionally installing pip."""
     already_existed = os.path.exists(root)
-    uv = shutil.which("uv")
-    if not uv:
-        print("ERROR: uv executable not found. Install uv from https://astral.sh/uv.")
-        raise VenvCreationFailedError(root, 127, already_existed)
 
     if isinstance(python, str) or python is None:
         target_python = python or sys.executable
@@ -125,11 +121,12 @@ def create_venv(
         except AttributeError as exc:
             raise TypeError(f"expected python str, got {python!r}") from exc
 
-    argv = [uv, "venv"]
-    if target_python:
-        argv.extend(["--python", target_python])
-    argv.append(root)
-    ec, _, _ = _utils.run_cmd(argv, env=env)
+    args = [
+        "venv",
+        *( ["--python", target_python] if target_python else [] ),
+        root,
+    ]
+    ec, _, _ = _utils.run_uv(*args, env=env)
     if ec != 0:
         if cleanonfail and not already_existed:
             _utils.safe_rmtree(root)

From 1414f8753e9a24bded244f5cdd7dd6ed75bf7b36 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 17:34:14 +0200
Subject: [PATCH 03/22] lint

---
 dev.py                  | 2 +-
 pyperformance/_utils.py | 6 ++++--
 pyperformance/_venv.py  | 3 +--
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/dev.py b/dev.py
index 9d87ae18..669d6712 100644
--- a/dev.py
+++ b/dev.py
@@ -2,8 +2,8 @@
 
 import os.path
 import shutil
-import subprocess
 import sys
+
 from pyperformance import _utils
 
 REPO_ROOT = os.path.dirname(os.path.abspath(__file__))
diff --git a/pyperformance/_utils.py b/pyperformance/_utils.py
index 50c90ee8..83fc7f63 100644
--- a/pyperformance/_utils.py
+++ b/pyperformance/_utils.py
@@ -23,8 +23,8 @@
 import errno
 import os
 import os.path
-import shutil
 import shlex
+import shutil
 import subprocess
 import sys
 import tempfile
@@ -171,7 +171,9 @@ def run_uv(*args, env=None, capture=None, verbose=True):
     uv = shutil.which("uv")
     if not uv:
         if verbose:
-            print("ERROR: uv executable not found. Install uv from https://astral.sh/uv.")
+            print(
+                "ERROR: uv executable not found. Install uv from https://astral.sh/uv."
+            )
         return 127, None, None
     return run_cmd([uv, *args], env=env, capture=capture, verbose=verbose)
 
diff --git a/pyperformance/_venv.py b/pyperformance/_venv.py
index a4c675db..bd1a56ac 100644
--- a/pyperformance/_venv.py
+++ b/pyperformance/_venv.py
@@ -2,7 +2,6 @@
 
 import os
 import os.path
-import shutil
 import sys
 import types
 
@@ -123,7 +122,7 @@ def create_venv(
 
     args = [
         "venv",
-        *( ["--python", target_python] if target_python else [] ),
+        *(["--python", target_python] if target_python else []),
         root,
     ]
     ec, _, _ = _utils.run_uv(*args, env=env)

From 76ad094e22c77fa9546549f050dce1542bf3b4ae Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 19:05:20 +0200
Subject: [PATCH 04/22] unbreak ga?

---
 .github/workflows/main.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8535da4f..d7260341 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -64,6 +64,10 @@ jobs:
       with:
         python-version: ${{ matrix.python }}
         nogil: ${{ matrix.build == 'free-threading' }}
+    - name: Install uv
+      uses: astral-sh/setup-uv@v6
+      with:
+        version: "0.9.5"
     - name: Install
       # pyperformance must be installed:
       # pyperformance/tests/test_compare.py imports it

From bb1101f5864123a8d55d998673bcbd1fbafeefba Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 19:12:30 +0200
Subject: [PATCH 05/22] seed venv

---
 pyperformance/tests/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyperformance/tests/__init__.py b/pyperformance/tests/__init__.py
index 9f0a5858..1ffdc49e 100644
--- a/pyperformance/tests/__init__.py
+++ b/pyperformance/tests/__init__.py
@@ -78,7 +78,7 @@ def cleanup():
     uv = shutil.which("uv")
     if not uv:
         raise RuntimeError("uv executable is required to provision test environments")
-    argv = [uv, "venv"]
+    argv = [uv, "venv", "--seed"]
     if python:
         argv.extend(["--python", python])
     argv.append(root)

From 2b7cfa3739744ac6c97341a0a539cce31c8d125b Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 20:01:45 +0200
Subject: [PATCH 06/22] ensure once

---
 pyperformance/commands.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/pyperformance/commands.py b/pyperformance/commands.py
index 7d67010f..7fc6603b 100644
--- a/pyperformance/commands.py
+++ b/pyperformance/commands.py
@@ -89,7 +89,6 @@ def cmd_venv_recreate(options, root, python, benchmarks):
             venv.ensure_pip()
             try:
                 venv.ensure_reqs(requirements)
-                venv.ensure_reqs(requirements)
             except _venv.RequirementsInstallationFailedError:
                 sys.exit(1)
         else:

From c776958804535f36595980d02d7075748e6a93bc Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 20:30:59 +0200
Subject: [PATCH 07/22] use uv pip

---
 .github/workflows/main.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d7260341..d33b2259 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -72,8 +72,8 @@ jobs:
       # pyperformance must be installed:
       # pyperformance/tests/test_compare.py imports it
       run: |
-        python -m pip install --upgrade pip setuptools
-        python -m pip install -e .
+        uv pip install --upgrade pip setuptools
+        uv pip install -e .
     - name: Display Python version
       run: |
         python -VV

From 40031e2d705cfb331d0b7715c7d8f2d52ba61eb4 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 20:31:37 +0200
Subject: [PATCH 08/22] gh action caching

---
 .github/workflows/main.yml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d33b2259..b9f0eac2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -65,9 +65,11 @@ jobs:
         python-version: ${{ matrix.python }}
         nogil: ${{ matrix.build == 'free-threading' }}
     - name: Install uv
-      uses: astral-sh/setup-uv@v6
+      uses: astral-sh/setup-uv@v7
       with:
         version: "0.9.5"
+        enable-cache: true
+        cache-suffix: ${{ runner.os }}-${{ matrix.python }}-${{ matrix.build != '' && matrix.build || 'default' }}
     - name: Install
       # pyperformance must be installed:
       # pyperformance/tests/test_compare.py imports it

From 976e978c5f81f65f314fdfbdbd47710b7c7b752a Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 20:34:00 +0200
Subject: [PATCH 09/22] system in ga should be ok

---
 .github/workflows/main.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b9f0eac2..dfd9d5a4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -74,8 +74,8 @@ jobs:
       # pyperformance must be installed:
       # pyperformance/tests/test_compare.py imports it
       run: |
-        uv pip install --upgrade pip setuptools
-        uv pip install -e .
+        uv pip install --system --upgrade pip setuptools
+        uv pip install --system -e .
     - name: Display Python version
       run: |
         python -VV

From 5f1af6398b950067a8db6f2793246155fa9d46f0 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 20:50:58 +0200
Subject: [PATCH 10/22] --python

---
 .github/workflows/main.yml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index dfd9d5a4..447b39e2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -71,11 +71,13 @@ jobs:
         enable-cache: true
         cache-suffix: ${{ runner.os }}-${{ matrix.python }}-${{ matrix.build != '' && matrix.build || 'default' }}
     - name: Install
+      shell: bash
       # pyperformance must be installed:
       # pyperformance/tests/test_compare.py imports it
       run: |
-        uv pip install --system --upgrade pip setuptools
-        uv pip install --system -e .
+        PYTHON_BIN="$(python -c 'import sys; print(sys.executable)')"
+        uv pip install --python "$PYTHON_BIN" --upgrade pip setuptools
+        uv pip install --python "$PYTHON_BIN" -e .
     - name: Display Python version
       run: |
         python -VV

From 164f0c87caf5decf0a953c9fb122469b6457235b Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 21:04:54 +0200
Subject: [PATCH 11/22] psutil is the source of all evil

---
 pyproject.toml | 1 -
 uv.lock        | 4 +---
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index aa8966b5..359f5cd5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,7 +65,6 @@ classifiers = [
 dynamic = [ "version" ]
 dependencies = [
   "packaging==23.1",
-  "psutil==5.9.5",
   "pyperf==2.9",
   "tomli; python_version<'3.11'",
 ]
diff --git a/uv.lock b/uv.lock
index f98dddff..c508bf1d 100644
--- a/uv.lock
+++ b/uv.lock
@@ -168,7 +168,6 @@ name = "pyperformance"
 source = { editable = "." }
 dependencies = [
     { name = "packaging" },
-    { name = "psutil" },
     { name = "pyperf" },
     { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
@@ -184,8 +183,7 @@ dev = [
 requires-dist = [
     { name = "mypy", marker = "extra == 'dev'", specifier = "==1.18.2" },
     { name = "packaging", specifier = "==23.1" },
-    { name = "psutil", specifier = "==5.9.5" },
-    { name = "pyperf", specifier = "==2.9.0" },
+    { name = "pyperf", specifier = "==2.9" },
     { name = "tomli", marker = "python_full_version < '3.11'" },
     { name = "tomli", marker = "extra == 'dev'" },
     { name = "tox", marker = "extra == 'dev'" },

From 87e58b7e8896cbe9c7bfd9309d15fb91608f7599 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 22:05:32 +0200
Subject: [PATCH 12/22] use run_uv everywhere

---
 pyperformance/tests/__init__.py | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/pyperformance/tests/__init__.py b/pyperformance/tests/__init__.py
index 1ffdc49e..54e37555 100644
--- a/pyperformance/tests/__init__.py
+++ b/pyperformance/tests/__init__.py
@@ -9,6 +9,8 @@
 import tempfile
 import unittest
 
+from pyperformance._utils import run_uv
+
 TESTS_ROOT = os.path.realpath(os.path.dirname(__file__))
 DATA_DIR = os.path.join(TESTS_ROOT, "data")
 REPO_ROOT = os.path.dirname(os.path.dirname(TESTS_ROOT))
@@ -75,14 +77,17 @@ def cleanup():
         def cleanup():
             return None
 
-    uv = shutil.which("uv")
-    if not uv:
-        raise RuntimeError("uv executable is required to provision test environments")
-    argv = [uv, "venv", "--seed"]
+    argv = ["venv", "--seed"]
     if python:
         argv.extend(["--python", python])
     argv.append(root)
-    run_cmd(*argv, capture=not verbose, onfail="raise", verbose=verbose)
+    exitcode, _, _ = run_uv(*argv, capture=not verbose, verbose=verbose)
+    if exitcode:
+        if exitcode == 127:
+            raise RuntimeError(
+                "uv executable is required to provision test environments"
+            )
+        raise RuntimeError(f'"uv {" ".join(argv)}" failed with exit code {exitcode}')
     venv_root = os.path.realpath(root)
     return venv_root, _resolve_venv_python(venv_root), cleanup
 

From 05b1da4eadfe7c21404a663f50701d91b6288bb6 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 22:17:48 +0200
Subject: [PATCH 13/22] import less

---
 dev.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/dev.py b/dev.py
index 669d6712..b6e4127d 100644
--- a/dev.py
+++ b/dev.py
@@ -4,7 +4,7 @@
 import shutil
 import sys
 
-from pyperformance import _utils
+from pyperformance._utils import run_uv
 
 REPO_ROOT = os.path.dirname(os.path.abspath(__file__))
 VENVS = os.path.join(REPO_ROOT, ".venvs")
@@ -44,7 +44,7 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
                 shutil.rmtree(venvroot)
             else:
                 print(f"creating uv env at {relroot}...")
-            ec, _, _ = _utils.run_uv(
+            ec, _, _ = run_uv(
                 "venv",
                 "--python",
                 sys.executable,
@@ -63,7 +63,7 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
     if not isready:
         relroot = os.path.relpath(venvroot)
         print(f"uv env {relroot} not ready, installing dependencies...")
-        ec, _, _ = _utils.run_uv(
+        ec, _, _ = run_uv(
             "pip",
             "install",
             "--python",

From d458ec1258c23bb038e0ce46a0d7110589576047 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 23:12:42 +0200
Subject: [PATCH 14/22] separate module, uv pip

---
 dev.py                          |  2 +-
 pyperformance/_utils.py         | 13 -----
 pyperformance/_uv.py            | 85 +++++++++++++++++++++++++++++++++
 pyperformance/_venv.py          | 10 ++--
 pyperformance/tests/__init__.py |  2 +-
 5 files changed, 93 insertions(+), 19 deletions(-)
 create mode 100644 pyperformance/_uv.py

diff --git a/dev.py b/dev.py
index b6e4127d..82e7a0da 100644
--- a/dev.py
+++ b/dev.py
@@ -4,7 +4,7 @@
 import shutil
 import sys
 
-from pyperformance._utils import run_uv
+from pyperformance._uv import run_uv
 
 REPO_ROOT = os.path.dirname(os.path.abspath(__file__))
 VENVS = os.path.join(REPO_ROOT, ".venvs")
diff --git a/pyperformance/_utils.py b/pyperformance/_utils.py
index 83fc7f63..e0eaa5b2 100644
--- a/pyperformance/_utils.py
+++ b/pyperformance/_utils.py
@@ -11,8 +11,6 @@
     "parse_name_pattern",
     "parse_selections",
     "parse_tag_pattern",
-    # tooling
-    "run_uv",
 ]
 
 
@@ -167,17 +165,6 @@ def run_python(*args, python=sys.executable, **kwargs):
     return run_cmd([python, *args], **kwargs)
 
 
-def run_uv(*args, env=None, capture=None, verbose=True):
-    uv = shutil.which("uv")
-    if not uv:
-        if verbose:
-            print(
-                "ERROR: uv executable not found. Install uv from https://astral.sh/uv."
-            )
-        return 127, None, None
-    return run_cmd([uv, *args], env=env, capture=capture, verbose=verbose)
-
-
 #######################################
 # network utils
 
diff --git a/pyperformance/_uv.py b/pyperformance/_uv.py
new file mode 100644
index 00000000..4a427bd7
--- /dev/null
+++ b/pyperformance/_uv.py
@@ -0,0 +1,85 @@
+"""Utilities for invoking the ``uv`` CLI."""
+
+import os
+import os.path
+import shutil
+
+from . import _pip, _utils
+
+
+def run_uv(*args, env=None, capture=None, verbose=True):
+    uv = shutil.which("uv")
+    if not uv:
+        if verbose:
+            print(
+                "ERROR: uv executable not found. Install uv from https://astral.sh/uv."
+            )
+        return 127, None, None
+    return _utils.run_cmd([uv, *args], env=env, capture=capture, verbose=verbose)
+
+
+def _iter_requirements(*reqs):
+    for item in reqs:
+        if item is None:
+            continue
+        if isinstance(item, os.PathLike):
+            yield os.fspath(item)
+            continue
+        if isinstance(item, bytes):
+            yield item.decode()
+            continue
+        if isinstance(item, str):
+            yield item
+            continue
+        specs = getattr(item, "specs", None)
+        if specs is not None:
+            yield from _iter_requirements(*specs)
+            continue
+        if isinstance(item, (list, tuple, set)):
+            yield from _iter_requirements(*item)
+            continue
+        try:
+            iterator = iter(item)
+        except TypeError:
+            yield str(item)
+        else:
+            yield from _iter_requirements(*iterator)
+
+
+def install_requirements(
+    *reqs,
+    python,
+    upgrade=True,
+    env=None,
+    verbose=True,
+):
+    requirements = list(_iter_requirements(*reqs))
+    if not requirements:
+        return 0, None, None
+
+    args = [
+        "pip",
+        "install",
+        "--python",
+        python,
+    ]
+    if upgrade:
+        args.append("--upgrade")
+
+    for spec in requirements:
+        if os.path.isfile(spec) and spec.endswith(".txt"):
+            args.extend(["-r", spec])
+        else:
+            args.append(spec)
+
+    ec, stdout, stderr = run_uv(*args, env=env, verbose=verbose)
+    if ec == 127:
+        first, *rest = requirements
+        return _pip.install_requirements(
+            first,
+            *rest,
+            python=python,
+            env=env,
+            upgrade=upgrade,
+        )
+    return ec, stdout, stderr
diff --git a/pyperformance/_venv.py b/pyperformance/_venv.py
index bd1a56ac..4f9d30a0 100644
--- a/pyperformance/_venv.py
+++ b/pyperformance/_venv.py
@@ -5,7 +5,7 @@
 import sys
 import types
 
-from . import _pip, _pythoninfo, _utils
+from . import _pip, _pythoninfo, _utils, _uv
 
 
 class VenvCreationFailedError(Exception):
@@ -125,7 +125,7 @@ def create_venv(
         *(["--python", target_python] if target_python else []),
         root,
     ]
-    ec, _, _ = _utils.run_uv(*args, env=env)
+    ec, _, _ = _uv.run_uv(*args, env=env)
     if ec != 0:
         if cleanonfail and not already_existed:
             _utils.safe_rmtree(root)
@@ -214,7 +214,9 @@ def base(self):
             return self._base
 
     def ensure_pip(self, downloaddir=None, *, installer=True, upgrade=True):
-        if not upgrade and _pip.is_pip_installed(self.python, env=self._env):
+        if _pip.is_pip_installed(self.python, env=self._env):
+            if upgrade:
+                self.upgrade_pip(installer=installer)
             return
         ec, _, _ = _pip.install_pip(
             self.python,
@@ -250,7 +252,7 @@ def upgrade_pip(self, *, installer=True):
 
     def ensure_reqs(self, *reqs, upgrade=True):
         print("Installing requirements into the virtual environment %s" % self.root)
-        ec, _, _ = _pip.install_requirements(
+        ec, _, _ = _uv.install_requirements(
             *reqs,
             python=self.python,
             env=self._env,
diff --git a/pyperformance/tests/__init__.py b/pyperformance/tests/__init__.py
index 54e37555..26c0c920 100644
--- a/pyperformance/tests/__init__.py
+++ b/pyperformance/tests/__init__.py
@@ -9,7 +9,7 @@
 import tempfile
 import unittest
 
-from pyperformance._utils import run_uv
+from pyperformance._uv import run_uv
 
 TESTS_ROOT = os.path.realpath(os.path.dirname(__file__))
 DATA_DIR = os.path.join(TESTS_ROOT, "data")

From a3ef49c0c2f9f24fc6dcb44daa8010b1569a83c9 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 23:23:08 +0200
Subject: [PATCH 15/22] copy from _pip

---
 pyperformance/_uv.py | 39 ++++++++++-----------------------------
 1 file changed, 10 insertions(+), 29 deletions(-)

diff --git a/pyperformance/_uv.py b/pyperformance/_uv.py
index 4a427bd7..6f62110f 100644
--- a/pyperformance/_uv.py
+++ b/pyperformance/_uv.py
@@ -18,34 +18,6 @@ def run_uv(*args, env=None, capture=None, verbose=True):
     return _utils.run_cmd([uv, *args], env=env, capture=capture, verbose=verbose)
 
 
-def _iter_requirements(*reqs):
-    for item in reqs:
-        if item is None:
-            continue
-        if isinstance(item, os.PathLike):
-            yield os.fspath(item)
-            continue
-        if isinstance(item, bytes):
-            yield item.decode()
-            continue
-        if isinstance(item, str):
-            yield item
-            continue
-        specs = getattr(item, "specs", None)
-        if specs is not None:
-            yield from _iter_requirements(*specs)
-            continue
-        if isinstance(item, (list, tuple, set)):
-            yield from _iter_requirements(*item)
-            continue
-        try:
-            iterator = iter(item)
-        except TypeError:
-            yield str(item)
-        else:
-            yield from _iter_requirements(*iterator)
-
-
 def install_requirements(
     *reqs,
     python,
@@ -53,7 +25,16 @@ def install_requirements(
     env=None,
     verbose=True,
 ):
-    requirements = list(_iter_requirements(*reqs))
+    requirements = []
+    for item in reqs:
+        if item is None:
+            continue
+        if isinstance(item, os.PathLike):
+            requirements.append(os.fspath(item))
+        elif isinstance(item, bytes):
+            requirements.append(item.decode())
+        else:
+            requirements.append(str(item))
     if not requirements:
         return 0, None, None
 

From 3a402551d306ba7b4e80c1b308c426f5f2a08e30 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 23:26:30 +0200
Subject: [PATCH 16/22] reduce the diff

---
 dev.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/dev.py b/dev.py
index 82e7a0da..b09b8375 100644
--- a/dev.py
+++ b/dev.py
@@ -39,11 +39,11 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
         isready = os.path.exists(readyfile)
         if not isready:
             relroot = os.path.relpath(venvroot)
-            if os.path.exists(venvroot):
+            if not os.path.exists(venvroot):
+                print(f"creating uv env at {relroot}...")
+            else:
                 print(f"uv env {relroot} not ready, re-creating...")
                 shutil.rmtree(venvroot)
-            else:
-                print(f"creating uv env at {relroot}...")
             ec, _, _ = run_uv(
                 "venv",
                 "--python",

From 4b5f47a1292e94802af93873709b688cc0c43de1 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 23:44:24 +0200
Subject: [PATCH 17/22] how fast are we without caching?

---
 .github/workflows/main.yml | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 447b39e2..232d503d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -68,7 +68,6 @@ jobs:
       uses: astral-sh/setup-uv@v7
       with:
         version: "0.9.5"
-        enable-cache: true
         cache-suffix: ${{ runner.os }}-${{ matrix.python }}-${{ matrix.build != '' && matrix.build || 'default' }}
     - name: Install
       shell: bash

From 60b981242c846917f0dce6c54a393a3987b9eb25 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sat, 25 Oct 2025 23:57:52 +0200
Subject: [PATCH 18/22] Revert "how fast are we without caching?"

This reverts commit 4b5f47a1292e94802af93873709b688cc0c43de1.
---
 .github/workflows/main.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 232d503d..447b39e2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -68,6 +68,7 @@ jobs:
       uses: astral-sh/setup-uv@v7
       with:
         version: "0.9.5"
+        enable-cache: true
         cache-suffix: ${{ runner.os }}-${{ matrix.python }}-${{ matrix.build != '' && matrix.build || 'default' }}
     - name: Install
       shell: bash

From 2ddd03ce987ddce372d2008902fb4bcbac2964db Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sun, 26 Oct 2025 01:38:11 +0200
Subject: [PATCH 19/22] smaller diff

---
 dev.py                          | 4 ++--
 pyperformance/tests/__init__.py | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/dev.py b/dev.py
index b09b8375..b5659917 100644
--- a/dev.py
+++ b/dev.py
@@ -4,8 +4,6 @@
 import shutil
 import sys
 
-from pyperformance._uv import run_uv
-
 REPO_ROOT = os.path.dirname(os.path.abspath(__file__))
 VENVS = os.path.join(REPO_ROOT, ".venvs")
 
@@ -32,6 +30,8 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
         readyfile = os.path.join(sys.prefix, "READY")
         isready = os.path.exists(readyfile)
     else:
+        from pyperformance._uv import run_uv
+
         if not venvroot:
             venvroot = resolve_venv_root(kind, venvsdir)
         # Make sure the venv exists.
diff --git a/pyperformance/tests/__init__.py b/pyperformance/tests/__init__.py
index 26c0c920..0853a819 100644
--- a/pyperformance/tests/__init__.py
+++ b/pyperformance/tests/__init__.py
@@ -9,8 +9,6 @@
 import tempfile
 import unittest
 
-from pyperformance._uv import run_uv
-
 TESTS_ROOT = os.path.realpath(os.path.dirname(__file__))
 DATA_DIR = os.path.join(TESTS_ROOT, "data")
 REPO_ROOT = os.path.dirname(os.path.dirname(TESTS_ROOT))
@@ -66,6 +64,8 @@ def _resolve_venv_python(venv):
 
 
 def create_venv(root=None, python=sys.executable, *, verbose=False):
+    from pyperformance._uv import run_uv
+
     if not root:
         tmpdir = tempfile.mkdtemp()
         root = os.path.join(tmpdir, "venv")

From 4dfad0850f8871b8d1db95fe862d68964268ec79 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sun, 26 Oct 2025 01:42:25 +0200
Subject: [PATCH 20/22] reduce diff even more!

---
 dev.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/dev.py b/dev.py
index b5659917..2a366b8b 100644
--- a/dev.py
+++ b/dev.py
@@ -40,9 +40,9 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
         if not isready:
             relroot = os.path.relpath(venvroot)
             if not os.path.exists(venvroot):
-                print(f"creating uv env at {relroot}...")
+                print(f"creating env at {relroot}...")
             else:
-                print(f"uv env {relroot} not ready, re-creating...")
+                print(f"venv {relroot} not ready, re-creating...")
                 shutil.rmtree(venvroot)
             ec, _, _ = run_uv(
                 "venv",
@@ -62,7 +62,7 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
     # Now make sure the venv has pyperformance installed.
     if not isready:
         relroot = os.path.relpath(venvroot)
-        print(f"uv env {relroot} not ready, installing dependencies...")
+        print(f"venv {relroot} not ready, installing dependencies...")
         ec, _, _ = run_uv(
             "pip",
             "install",
@@ -76,7 +76,7 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
             sys.exit("ERROR: uv pip install failed")
         with open(readyfile, "w"):
             pass
-        print(f"...uv env {relroot} ready!")
+        print(f"...venv {relroot} ready!")
 
     return venvroot, python
 

From 4d1f1e3f2340b51867d32048f090bcaaa012f9fd Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sun, 26 Oct 2025 01:49:00 +0200
Subject: [PATCH 21/22] diff...

---
 dev.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dev.py b/dev.py
index 2a366b8b..7d402df0 100644
--- a/dev.py
+++ b/dev.py
@@ -40,7 +40,7 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
         if not isready:
             relroot = os.path.relpath(venvroot)
             if not os.path.exists(venvroot):
-                print(f"creating env at {relroot}...")
+                print(f"creating venv at {relroot}...")
             else:
                 print(f"venv {relroot} not ready, re-creating...")
                 shutil.rmtree(venvroot)
@@ -51,7 +51,7 @@ def ensure_venv_ready(venvroot=None, kind="dev", venvsdir=VENVS):
                 venvroot,
             )
             if ec != 0:
-                sys.exit("ERROR: uv venv creation failed")
+                sys.exit("ERROR: venv creation failed")
         else:
             assert os.path.exists(os.path.join(venvroot, "pyvenv.cfg"))
         # Return the venv's Python executable.

From ba9fc09458ee140a7a3f65dd61e5e49c07dd20b9 Mon Sep 17 00:00:00 2001
From: maurycy <5383+maurycy@users.noreply.github.com>
Date: Sun, 26 Oct 2025 01:49:09 +0200
Subject: [PATCH 22/22] simplify the requirements

---
 pyperformance/_uv.py | 34 +++++++---------------------------
 1 file changed, 7 insertions(+), 27 deletions(-)

diff --git a/pyperformance/_uv.py b/pyperformance/_uv.py
index 6f62110f..f9bd51af 100644
--- a/pyperformance/_uv.py
+++ b/pyperformance/_uv.py
@@ -18,26 +18,7 @@ def run_uv(*args, env=None, capture=None, verbose=True):
     return _utils.run_cmd([uv, *args], env=env, capture=capture, verbose=verbose)
 
 
-def install_requirements(
-    *reqs,
-    python,
-    upgrade=True,
-    env=None,
-    verbose=True,
-):
-    requirements = []
-    for item in reqs:
-        if item is None:
-            continue
-        if isinstance(item, os.PathLike):
-            requirements.append(os.fspath(item))
-        elif isinstance(item, bytes):
-            requirements.append(item.decode())
-        else:
-            requirements.append(str(item))
-    if not requirements:
-        return 0, None, None
-
+def install_requirements(reqs, *extra, python, upgrade=True, env=None, verbose=True):
     args = [
         "pip",
         "install",
@@ -47,7 +28,11 @@ def install_requirements(
     if upgrade:
         args.append("--upgrade")
 
-    for spec in requirements:
+    for spec in (reqs, *extra):
+        if spec is None:
+            continue
+        if isinstance(spec, os.PathLike):
+            spec = os.fspath(spec)
         if os.path.isfile(spec) and spec.endswith(".txt"):
             args.extend(["-r", spec])
         else:
@@ -55,12 +40,7 @@ def install_requirements(
 
     ec, stdout, stderr = run_uv(*args, env=env, verbose=verbose)
     if ec == 127:
-        first, *rest = requirements
         return _pip.install_requirements(
-            first,
-            *rest,
-            python=python,
-            env=env,
-            upgrade=upgrade,
+            reqs, *extra, python=python, env=env, upgrade=upgrade
         )
     return ec, stdout, stderr