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Title: gh-149584: Fix excessive overhead in the Tachyon profiler regarding the cache behavior by pablogsal · Pull Request #149649 · python/cpython · GitHub

Open Graph Title: gh-149584: Fix excessive overhead in the Tachyon profiler regarding the cache behavior by pablogsal · Pull Request #149649 · python/cpython

X Title: gh-149584: Fix excessive overhead in the Tachyon profiler regarding the cache behavior by pablogsal · Pull Request #149649 · python/cpython

Description: Some ideas after the discussion in the issue with @maurycy. The profiler was spending too much time on repeated remote-memory bookkeeping, full remote page reads for small fixed-size structs, repeated remote writes of unchanged frame-cache state, and Python object allocation churn on steady-state frame-cache hits. This PR improves the profiler by: reading hot interpreter/thread/frame structs with exact remote reads instead of page-cache reads tracking the number of live page-cache entries so cache clear/search only scans the used prefix batching predicted interpreter/thread/frame reads with process_vm_readv() on Linux reusing cached FrameInfo and thread id objects when frame-cache hits dominate The last_profiled_frame remote-write suppression is already present in current upstream/main, so this branch keeps that baseline behavior and builds on top of it. Benchmark Benchmarked with: ./python Tools/inspection/benchmark_external_inspection.py --duration 3 For the per-commit measurements, I used the same benchmark workload in quiet mode with cache_frames=True and all_threads=True. Step Work rate Sample rate Avg call time Incremental win upstream/main baseline 382,593/s 363,963/s 2.614 us - Exact reads for hot structs 549,741/s 514,642/s 1.819 us +167,148/s (+43.7%) Track live page-cache entries 747,946/s 688,282/s 1.337 us +198,205/s (+36.1%) Batch predicted remote reads 897,703/s 806,084/s 1.114 us +149,756/s (+20.0%) Reuse profiler result objects 1,187,314/s 1,047,698/s 0.842 us +289,611/s (+32.3%) Final benchmark using the benchmark script: Metric Baseline Final Change Work rate 382,593/s 1,180,434/s 3.08x faster Sample rate 363,963/s 1,038,965/s 2.85x faster Avg call time 2.614 us 0.85 us -67.5% Success rate 99.67% 99.84% +0.17 pp Final benchmark output: Average call time: 0.85 us Work rate: 1,180,434.2 calls/sec Sample rate: 1,038,964.9 samples/sec Success rate: 99.84% Issue: gh-149584

Open Graph Description: Some ideas after the discussion in the issue with @maurycy. The profiler was spending too much time on repeated remote-memory bookkeeping, full remote page reads for small fixed-size structs, repea...

X Description: Some ideas after the discussion in the issue with @maurycy. The profiler was spending too much time on repeated remote-memory bookkeeping, full remote page reads for small fixed-size structs, repea...

Opengraph URL: https://github.com/python/cpython/pull/149649

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gh-149584: Fix excessive overhead in the Tachyon profiler regarding the cache behavior https://github.com/python/cpython/pull/149649/files#top
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c5520d3 gh-149584: Avoid page reads for hot profiler structs pablogsal May 10, 2026 https://github.com/python/cpython/pull/149649/commits/c5520d361c87a7993799e3e98db335d83aec7070
8be8d7d gh-149584: Track live remote page cache entries pablogsal May 10, 2026 https://github.com/python/cpython/pull/149649/commits/8be8d7d6a825d5ab1aaa6e25b81a31c02f90eee5
5dc0309 gh-149584: Batch predicted profiler reads pablogsal May 10, 2026 https://github.com/python/cpython/pull/149649/commits/5dc0309fb79fa09d4f4961d589982a6cea96247c
c69a0f3 gh-149584: Reuse profiler result objects pablogsal May 10, 2026 https://github.com/python/cpython/pull/149649/commits/c69a0f361700db334d41615c9c6b647f5ef353c1
7a85c9a gh-149584: Add NEWS for Tachyon profiler overhead fix pablogsal May 10, 2026 https://github.com/python/cpython/pull/149649/commits/7a85c9a720d4687cf97ccd9f4c36bb6d5cd95a53
46a0b2c Address review feedback pablogsal May 12, 2026 https://github.com/python/cpython/pull/149649/commits/46a0b2cd48a690492e2fca0e94367113ed8de69a
f7fe3be Add async benchmark modes pablogsal May 12, 2026 https://github.com/python/cpython/pull/149649/commits/f7fe3beda1d911455fe36ec50901a7e745219548
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d576d38 small cleanp pablogsal May 13, 2026 https://github.com/python/cpython/pull/149649/commits/d576d388020bc283a145fea4bd634ec3b2cd9f47
05799a7 fixup! small cleanp May 19, 2026 https://github.com/python/cpython/pull/149649/commits/05799a748a7bc0a6e75bdca5134f0bbe324632e4
4245b13 fixup! fixup! small cleanp May 20, 2026 https://github.com/python/cpython/pull/149649/commits/4245b13b7121c05d2a961e1426ed652ea105baa8
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