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| git_commit |
commit 478e45fb94e541dfd3a53a23bbc8ed98337b8a77 Author: Roger Sanders <sanders_roger@hotmail.com> Date: Thu Nov 13 19:13:41 2025 +1100 [libc++] Improve performance of std::atomic_flag on Windows (#163524) On Windows 8 and above, the WaitOnAddress, WakeByAddressSingle and WakeByAddressAll functions allow efficient implementation of the C++20 wait and notify features of std::atomic_flag. These Windows functions have never been made use of in libc++, leading to very poor performance of these features on Windows platforms, as they are implemented using a spin loop with backoff, rather than using any OS thread signalling whatsoever. This change implements the use of these OS functions where available, falling back to the original implementation on Windows versions prior to 8. Relevant API docs from Microsoft: https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-waitonaddress https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-wakebyaddresssingle https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-wakebyaddressall Fixes #127221 |
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ldionne-old-macbook-results test results
| Run | Order | Start Time | Duration |
|---|---|---|---|
| Current | 559266 | 2025-12-16T16:40:01 | 0:00:00 |
| Previous | 559265 | 2025-12-16T16:40:01 | 0:00:00 |
| Baseline | 485288 | 2025-12-16T16:40:01 | 0:00:00 |
Tests Summary
| Status Group | # | # (B) |
|---|---|---|
| Performance Regressions | 2 | 0 |
| Performance Improvements | 3 | 0 |
| Added Tests | 0 | 16 |
| Unchanged Tests | 75 | 64 |
| Total Tests | 80 |
| Performance Regressions - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 748_flightdm_r | 1.37% | 8.808 | 8.929 | - | 0.00% | - |
| 753_ns3_r | 1.10% | 10.094 | 10.206 | - | 0.00% | - |
| Performance Improvements - execution_time | Δ | Previous | Current | σ | Δ (B) | σ (B) |
|---|---|---|---|---|---|---|
| 735_gem5_r | -2.45% | 13.528 | 13.197 | - | 0.00% | - |
| 727_cppcheck_r | -1.36% | 25.091 | 24.749 | - | 0.00% | - |
| 729_abc_r | -1.03% | 18.918 | 18.723 | - | 0.00% | - |
| Added Tests - execution_time |
|---|
| 706_stockfish_r |
| 707_ntest_r |
| 709_cactus_r |
| 710_omnetpp_r |
| 721_gcc_r |
| 723_llvm_r |
| 727_cppcheck_r |
| 729_abc_r |
| 731_astcenc_r |
| 735_gem5_r |
| 736_ocio_r |
| 737_gmsh_r |
| 748_flightdm_r |
| 750_sealcrypto_r |
| 753_ns3_r |
| 766_femflow_r |
Report Time: 0.14s