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GeezerVison is showing github.com — gh-149584: Use `mach_vm_remap` in Tachyon by maurycy · Pull Request #150893 · python/cpython

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@maurycy

@maurycy maurycy commented Jun 3, 2026 •
edited by bedevere-app Bot
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@pablogsal This is a sneak peak. I'm cooking it for the past two weeks. It's not bad:

Metric Baseline (main 025cc26) This PR Change
Work rate 339,576.5 calls/sec 2,925,619.9 calls/sec 8.61x faster
Sample rate 325,989.3 samples/sec 2,202,278.0 samples/sec 6.76x faster
Avg call time 2.94 µs 0.34 µs -88.4%
Total attempts 979,732 6,612,442 6.75x more
Successful samples 977,970 6,606,845 -
Failed samples 1,762 5,597 -
Success rate 99.82% 99.92% +0.10 pp
Work efficiency 96.2% 75.3% - 
2026-06-04T00:00:55.450053000+0200 maurycy@gimel /Users/maurycy/src/github.com/maurycy/cpython (vmremap 25e012d) % sudo ./python.exe Tools/inspection/benchmark_external_inspection.py --duration 3

[...]

Basic Statistics:
  Wall time:           3.000 seconds
  Total attempts:      6,612,442
  Successful samples:  6,606,845
  Failed samples:      5,597
  Success rate:        99.92%

Performance Metrics:
  Average call time:   0.34 µs
  Work rate:           2925619.9 calls/sec
  Sample rate:         2202278.0 samples/sec
  Total work time:     2.260 seconds
  Work efficiency:     75.3%

v.

2026-06-04T00:03:25.240297000+0200 maurycy@gimel /Users/maurycy/work/cpython-main (main 025cc26) % sudo ./python.exe Tools/inspection/benchmark_external_inspection.py --duration 3

============================================================
get_stack_trace() Benchmark Results
============================================================

Basic Statistics:
  Wall time:           3.000 seconds
  Total attempts:      979,732
  Successful samples:  977,970
  Failed samples:      1,762
  Success rate:        99.82%

Performance Metrics:
  Average call time:   2.94 µs
  Work rate:           339576.5 calls/sec
  Sample rate:         325989.3 samples/sec
  Total work time:     2.885 seconds
  Work efficiency:     96.2%
  • Issue: _remote_debugging: reading whole pages over and over #149584

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@maurycy
remap
25e012d
@maurycy
maurycy requested review from AA-Turner, emmatyping, erlend-aasland, itamaro and pablogsal as code owners June 3, 2026 22:10
@bedevere-app bedevere-app Bot added the awaiting review label Jun 3, 2026
@maurycy
maurycy marked this pull request as draft June 3, 2026 22:10
@bedevere-app bedevere-app Bot removed the awaiting review label Jun 3, 2026
@maurycy maurycy changed the title mach_vm_remap gh-149584: mach_vm_remap Jun 3, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Jun 3, 2026
_remote_debugging: reading whole pages over and over #149584
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@maurycy maurycy changed the title gh-149584: mach_vm_remap gh-149584: Use mach_vm_remap in Tachyon Jun 3, 2026
@maurycy

maurycy commented Jun 3, 2026

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It's still work in progress. I aimed to open this in maurycy/cpython.
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@maurycy maurycy closed this Jun 3, 2026
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@pablogsal pablogsal Awaiting requested review from pablogsal pablogsal is a code owner
@erlend-aasland erlend-aasland Awaiting requested review from erlend-aasland erlend-aasland is a code owner
@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner
@emmatyping emmatyping Awaiting requested review from emmatyping emmatyping is a code owner
@itamaro itamaro Awaiting requested review from itamaro itamaro is a code owner

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@maurycy
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