Build walltime

Author: Brooooooklyn

.github/workflows/benchmark.yml

@@ -33,7 +33,7 @@ jobs:
           tool: cargo-codspeed
 
       - name: Build benchmark
-        run: cargo codspeed build --features codspeed
+        run: cargo codspeed build --measurement-mode=walltime --features codspeed
       - name: Upload benchmark
         uses: actions/upload-artifact@v4
         with: