Omnitrace sample documentation (#179)

* Documentation for omnitrace-sample * Improve omnitrace-sample - improve the printing of the env updates - remove env settings when something is deactivated - restore env settings when something is deactivated
ROCm · Oct 19, 2022 · 67f7471 · 67f7471
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diff --git a/README.md b/README.md
@@ -85,9 +85,43 @@ such as the memory usage, page-faults, and context-switches, and thread-level me
 ## Documentation
 
 The full documentation for [omnitrace](https://github.com/AMDResearch/omnitrace) is available at [amdresearch.github.io/omnitrace](https://amdresearch.github.io/omnitrace/).
+See the [Getting Started documentation](https://amdresearch.github.io/omnitrace/getting_started) for general tips and a detailed discussion about sampling vs. binary instrumentation.
 
 ## Quick Start
 
+### Installation
+
+- Visit [Releases](https://github.com/AMDResearch/omnitrace/releases) page
+- Select appropriate installer (recommendation: `.sh` scripts do not require super-user priviledges unlike the DEB/RPM installers)
+  - If targeting a ROCm application, find the installer script with the matching ROCm version
+  - If you are unsure about your Linux distro, check `/etc/os-release`
+  - If no installer script matches your target OS, try one of the Ubuntu 18.04 `*.sh` installers
+    - This installation may be built against older library versions supported on your distro via backwards compatibility
+
+### Setup
+
+> NOTE: Replace `/opt/omnitrace` below with installation prefix as necessary.
+
+- Option 1: Source `setup-env.sh` script
+
+```bash
+source /opt/omnitrace/share/omnitrace/setup-env.sh
+```
+
+- Option 2: Load modulefile
+
+```bash
+module use /opt/omnitrace/share/modulefiles
+module load omnitrace
+```
+
+- Option 3: Manual
+
+```bash
+export PATH=/opt/omnitrace/bin:${PATH}
+export LD_LIBRARY_PATH=/opt/omnitrace/lib:${LD_LIBRARY_PATH}
+```
+
 ### Omnitrace Settings
 
 Generate an omnitrace configuration file using `omnitrace-avail -G omnitrace.cfg`. Optionally, use `omnitrace-avail -G omnitrace.cfg --all` for
@@ -111,9 +145,23 @@ Once the configuration file is adjusted to your preferences, either export the p
 or place this file in `${HOME}/.omnitrace.cfg` to ensure these values are always read as the default. If you wish to change any of these settings,
 you can override them via environment variables or by specifying an alternative `OMNITRACE_CONFIG_FILE`.
 
-### Omnitrace Executable
+### Call-Stack Sampling
 
-The `omnitrace` executable is used to instrument an existing binary.
+The `omnitrace-sample` executable is used to execute call-stack sampling on a target application without binary instrumentation.
+Use a double-hypen (`--`) to separate the command-line arguments for `omnitrace-sample` from the target application and it's arguments.
+
+```shell
+omnitrace-sample --help
+omnitrace-sample <omnitrace-options> -- <exe> <exe-options>
+omnitrace-sample -f 1000 -- ls -la
+```
+
+### Binary Instrumentation
+
+The `omnitrace` executable is used to instrument an existing binary. Call-stack sampling can be enabled alongside
+the execution an instrumented binary, to help "fill in the gaps" between the instrumentation via setting the `OMNITRACE_USE_SAMPLING`
+configuration variable to `ON`.
+Similar to `omnitrace-sample`, use a double-hypen (`--`) to separate the command-line arguments for `omnitrace` from the target application and it's arguments.
 
 ```shell
 omnitrace --help
@@ -183,9 +231,57 @@ omnitrace -ME '^(libhsa-runtime64|libz\\.so)' -- /path/to/app
 omnitrace -E 'rocr::atomic|rocr::core|rocr::HSA' --  /path/to/app
 ```
 
-### Visualizing Perfetto Results
+### Python Profiling and Tracing
+
+Use the `omnitrace-python` script to profile/trace Python interpreter function calls.
+Use a double-hypen (`--`) to separate the command-line arguments for `omnitrace-python` from the target script and it's arguments.
+
+```shell
+omnitrace-python --help
+omnitrace-python <omnitrace-options> -- <python-script> <script-args>
+omnitrace-python -- ./script.py
+```
+
+Please note, the first argument after the double-hyphen *must be a Python script*, e.g. `omnitrace-python -- ./script.py`.
+
+If you need to specify a specific python interpreter version, use `omnitrace-python-X.Y` where `X.Y` is the Python
+major and minor version:
+
+```shell
+omnitrace-python-3.8 -- ./script.py
+```
+
+If you need to specify the full path to a Python interpreter, set the `PYTHON_EXECUTABLE` environment variable:
+
+```shell
+PYTHON_EXECUTABLE=/opt/conda/bin/python omnitrace-python -- ./script.py
+```
+
+If you want to restrict the data collection to specific function(s) and its callees, pass the `-b` / `--builtin` option after decorating the
+function(s) with `@profile`. Use the `@noprofile` decorator for excluding/ignoring function(s) and its callees:
+
+```python
+def foo():
+    pass
+
+@noprofile
+def bar():
+    foo()
+
+@profile
+def spam():
+    foo()
+    bar()
+```
+
+Each time `spam` is called during profiling, the profiling results will include 1 entry for `spam` and 1 entry
+for `foo` via the direct call within `spam`. There will be no entries for `bar` or the `foo` invocation within it.
+
+### Trace Visualization
 
-Visit [ui.perfetto.dev](https://ui.perfetto.dev) in your browser and open up the `.proto` file(s) created by omnitrace.
+- Visit [ui.perfetto.dev](https://ui.perfetto.dev) in the web-browser
+- Select "Open trace file" from panel on the left
+- Locate the omnitrace perfetto output (extension: `.proto`)
 
 ![omnitrace-perfetto](source/docs/images/omnitrace-perfetto.png)
 

diff --git a/external/timemory b/external/timemory
diff --git a/source/bin/omnitrace-sample/impl.cpp b/source/bin/omnitrace-sample/impl.cpp
@@ -52,14 +52,17 @@
 #endif
 
 namespace color = tim::log::color;
-using tim::log::stream;
 using namespace timemory::join;
 using tim::get_env;
+using tim::log::colorized;
+using tim::log::stream;
 
 namespace
 {
-int verbose = 0;
-}
+int  verbose       = 0;
+auto updated_envs  = std::set<std::string_view>{};
+auto original_envs = std::set<std::string>{};
+}  // namespace
 
 std::string
 get_command(const char* _argv0)
@@ -92,7 +95,11 @@ get_initial_environment()
     {
         int idx = 0;
         while(environ[idx] != nullptr)
-            _env.emplace_back(strdup(environ[idx++]));
+        {
+            auto* _v = environ[idx++];
+            original_envs.emplace(_v);
+            _env.emplace_back(strdup(_v));
+        }
     }
 
     update_env(_env, "LD_PRELOAD",
@@ -106,22 +113,25 @@ get_initial_environment()
     update_env(_env, "OMNITRACE_USE_SAMPLING", true);
     update_env(_env, "OMNITRACE_CRITICAL_TRACE", false);
     update_env(_env, "OMNITRACE_USE_PROCESS_SAMPLING", false);
+
     // update_env(_env, "OMNITRACE_USE_PID", false);
     // update_env(_env, "OMNITRACE_TIME_OUTPUT", false);
     // update_env(_env, "OMNITRACE_OUTPUT_PATH", "omnitrace-output/%tag%/%launch_time%");
 
 #if defined(OMNITRACE_USE_ROCTRACER) || defined(OMNITRACE_USE_ROCPROFILER)
     update_env(_env, "HSA_TOOLS_LIB", _dl_libpath);
-    update_env(_env, "HSA_TOOLS_REPORT_LOAD_FAILURE", "1");
+    if(!getenv("HSA_TOOLS_REPORT_LOAD_FAILURE"))
+        update_env(_env, "HSA_TOOLS_REPORT_LOAD_FAILURE", "1");
 #endif
 
 #if defined(OMNITRACE_USE_ROCPROFILER)
     update_env(_env, "ROCP_TOOL_LIB", _omni_libpath);
-    update_env(_env, "ROCP_HSA_INTERCEPT", "1");
+    if(!getenv("ROCP_HSA_INTERCEPT")) update_env(_env, "ROCP_HSA_INTERCEPT", "1");
 #endif
 
 #if defined(OMNITRACE_USE_OMPT)
-    update_env(_env, "OMP_TOOL_LIBRARIES", _dl_libpath);
+    if(!getenv("OMP_TOOL_LIBRARIES"))
+        update_env(_env, "OMP_TOOL_LIBRARIES", _dl_libpath, true);
 #endif
 
     free(_dl_libpath);
@@ -140,11 +150,58 @@ get_internal_libpath(const std::string& _lib)
     return omnitrace::common::join("/", _dir, "..", "lib", _lib);
 }
 
+void
+print_updated_environment(std::vector<char*> _env)
+{
+    std::sort(_env.begin(), _env.end(), [](auto* _lhs, auto* _rhs) {
+        if(!_lhs) return false;
+        if(!_rhs) return true;
+        return std::string_view{ _lhs } < std::string_view{ _rhs };
+    });
+
+    std::vector<char*> _updates = {};
+    std::vector<char*> _general = {};
+
+    for(auto* itr : _env)
+    {
+        if(itr == nullptr) continue;
+
+        auto _is_omni = (std::string_view{ itr }.find("OMNITRACE") == 0);
+        auto _updated = false;
+        for(const auto& vitr : updated_envs)
+        {
+            if(std::string_view{ itr }.find(vitr) == 0)
+            {
+                _updated = true;
+                break;
+            }
+        }
+
+        if(_updated)
+            _updates.emplace_back(itr);
+        else if(verbose >= 1 && _is_omni)
+            _general.emplace_back(itr);
+    }
+
+    if(_general.size() + _updates.size() == 0 || verbose < 0) return;
+
+    std::cerr << std::endl;
+
+    for(auto& itr : _general)
+        stream(std::cerr, color::source()) << itr << "\n";
+    for(auto& itr : _updates)
+        stream(std::cerr, color::source()) << itr << "\n";
+
+    std::cerr << std::endl;
+}
+
 template <typename Tp>
 void
 update_env(std::vector<char*>& _environ, std::string_view _env_var, Tp&& _env_val,
            bool _append)
 {
+    updated_envs.emplace(_env_var);
+
     auto _key = join("", _env_var, "=");
     for(auto& itr : _environ)
     {
@@ -153,11 +210,13 @@ update_env(std::vector<char*>& _environ, std::string_view _env_var, Tp&& _env_va
         {
             if(_append)
             {
-                auto _val = std::string{ itr }.substr(_key.length());
-                free(itr);
-                itr = strdup(
-                    omnitrace::common::join('=', _env_var, join(":", _env_val, _val))
-                        .c_str());
+                if(std::string_view{ itr }.find(join("", _env_val)) ==
+                   std::string_view::npos)
+                {
+                    auto _val = std::string{ itr }.substr(_key.length());
+                    free(itr);
+                    itr = strdup(join('=', _env_var, join(":", _env_val, _val)).c_str());
+                }
             }
             else
             {
@@ -171,6 +230,22 @@ update_env(std::vector<char*>& _environ, std::string_view _env_var, Tp&& _env_va
         strdup(omnitrace::common::join('=', _env_var, _env_val).c_str()));
 }
 
+void
+remove_env(std::vector<char*>& _environ, std::string_view _env_var)
+{
+    auto _key   = join("", _env_var, "=");
+    auto _match = [&_key](auto itr) { return std::string_view{ itr }.find(_key) == 0; };
+
+    _environ.erase(std::remove_if(_environ.begin(), _environ.end(), _match),
+                   _environ.end());
+
+    for(const auto& itr : original_envs)
+    {
+        if(std::string_view{ itr }.find(_key) == 0)
+            _environ.emplace_back(strdup(itr.c_str()));
+    }
+}
+
 std::vector<char*>
 parse_args(int argc, char** argv, std::vector<char*>& _env)
 {
@@ -200,6 +275,11 @@ parse_args(int argc, char** argv, std::vector<char*>& _env)
         exit(_pec);
     };
 
+    auto* _dl_libpath =
+        realpath(get_internal_libpath("libomnitrace-dl.so").c_str(), nullptr);
+    auto* _omni_libpath =
+        realpath(get_internal_libpath("libomnitrace.so").c_str(), nullptr);
+
     auto parser = parser_t(argv[0]);
 
     parser.on_error([](parser_t&, const parser_err_t& _err) {
@@ -273,6 +353,7 @@ parse_args(int argc, char** argv, std::vector<char*>& _env)
         .dtype("bool")
         .action([&](parser_t& p) {
             auto _colorized = !p.get<bool>("monochrome");
+            colorized()     = _colorized;
             p.set_use_color(_colorized);
             update_env(_env, "OMNITRACE_COLORIZED_LOG", (_colorized) ? "1" : "0");
             update_env(_env, "COLORIZED_LOG", (_colorized) ? "1" : "0");
@@ -599,6 +680,12 @@ parse_args(int argc, char** argv, std::vector<char*>& _env)
             _update("OMNITRACE_TRACE_THREAD_LOCKS", _v.count("mutex-locks") > 0);
             _update("OMNITRACE_TRACE_THREAD_RW_LOCKS", _v.count("rw-locks") > 0);
             _update("OMNITRACE_TRACE_THREAD_SPIN_LOCKS", _v.count("spin-locks") > 0);
+
+            if(_v.count("all") > 0 || _v.count("ompt") > 0)
+                update_env(_env, "OMP_TOOL_LIBRARIES", _dl_libpath, true);
+
+            if(_v.count("all") > 0 || _v.count("kokkosp") > 0)
+                update_env(_env, "KOKKOS_PROFILE_LIBRARY", _omni_libpath, true);
         });
 
     parser.add_argument({ "-E", "--exclude" }, "Exclude data from these backends")
@@ -619,14 +706,32 @@ parse_args(int argc, char** argv, std::vector<char*>& _env)
             _update("OMNITRACE_TRACE_THREAD_LOCKS", _v.count("mutex-locks") > 0);
             _update("OMNITRACE_TRACE_THREAD_RW_LOCKS", _v.count("rw-locks") > 0);
             _update("OMNITRACE_TRACE_THREAD_SPIN_LOCKS", _v.count("spin-locks") > 0);
+
+            if(_v.count("all") > 0 ||
+               (_v.count("roctracer") > 0 && _v.count("rocprofiler") > 0))
+            {
+                remove_env(_env, "HSA_TOOLS_LIB");
+                remove_env(_env, "HSA_TOOLS_REPORT_LOAD_FAILURE");
+            }
+
+            if(_v.count("all") > 0 || _v.count("rocprofiler") > 0)
+            {
+                remove_env(_env, "ROCP_TOOL_LIB");
+                remove_env(_env, "ROCP_HSA_INTERCEPT");
+            }
+
+            if(_v.count("all") > 0 || _v.count("ompt") > 0)
+                remove_env(_env, "OMP_TOOL_LIBRARIES");
+
+            if(_v.count("all") > 0 || _v.count("kokkosp") > 0)
+                remove_env(_env, "KOKKOS_PROFILE_LIBRARY");
         });
 
     _add_separator("HARDWARE COUNTER OPTIONS", "");
     parser
         .add_argument({ "-C", "--cpu-events" },
                       "Set the CPU hardware counter events to record (ref: "
                       "`omnitrace-avail -H -c CPU`)")
-        .set_default(std::set<std::string>{})
         .action([&](parser_t& p) {
             auto _events =
                 join(array_config{ "," }, p.get<std::vector<std::string>>("cpu-events"));
@@ -638,7 +743,6 @@ parse_args(int argc, char** argv, std::vector<char*>& _env)
         .add_argument({ "-G", "--gpu-events" },
                       "Set the GPU hardware counter events to record (ref: "
                       "`omnitrace-avail -H -c GPU`)")
-        .set_default(std::set<std::string>{})
         .action([&](parser_t& p) {
             auto _events =
                 join(array_config{ "," }, p.get<std::vector<std::string>>("gpu-events"));
@@ -695,5 +799,8 @@ parse_args(int argc, char** argv, std::vector<char*>& _env)
         throw std::runtime_error(
             "Error! '--profile' argument conflicts with '--flat-profile' argument");
 
+    free(_dl_libpath);
+    free(_omni_libpath);
+
     return _outv;
 }
diff --git a/source/bin/omnitrace-sample/omnitrace-sample.cpp b/source/bin/omnitrace-sample/omnitrace-sample.cpp
@@ -52,15 +52,7 @@ main(int argc, char** argv)
             _argv.emplace_back(argv[i]);
     }
 
-    std::sort(_env.begin(), _env.end(), [](auto* _lhs, auto* _rhs) {
-        if(!_lhs) return false;
-        if(!_rhs) return true;
-        return std::string_view{ _lhs } < std::string_view{ _rhs };
-    });
-
-    for(auto* itr : _env)
-        if(itr != nullptr && std::string_view{ itr }.find("OMNITRACE") == 0)
-            std::cout << itr << "\n";
+    print_updated_environment(_env);
 
     if(!_argv.empty())
     {
+10 −9		source/timemory/signals/signal_handlers.cpp
+28 −6		source/timemory/unwind/bfd.cpp
+3 −0		source/timemory/unwind/bfd.hpp