perf: Suppress telemetry using ContextFlags(usize) instead of bool #2861
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Codecov ReportAll modified and coverable lines are covered by tests ✅
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## main #2861 +/- ##
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Coverage 81.4% 81.4%
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👷 build bot output from this run:
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These numbers are not relevant since the code has changed completely. |
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This is still a draft until #2870 has been merged and all benchmarks are run properly. |
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New performance numbers 2025-05-06 from this run:
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@bantonsson can you run the bench in your machine and see if you are also observing the same? I am seeing regression in my laptop. There are improvements to attach ones anyway, so we should still proceed with this PR, but I am curious how much we can trust the bench results from the CI machines! telemetry_suppression/enter_telemetry_suppressed_scope |
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@cijothomas These are the numbers from my And these are the numbers from my |
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The benchmark numbers comment have been updated with the latest run. |
The code seems to be highly sensitive to alignment, so use a bitfield instead of a boolean.
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It would be great if there could be some extra manual testing of this @cijothomas @lalitb so we can come to a conclusion. |
telemetry_suppression/enter_telemetry_suppressed_scope
time: [10.502 ns 10.524 ns 10.546 ns]
change: [+12.347% +12.742% +13.119%] (p = 0.00 < 0.05)
Performance has regressed.
telemetry_suppression/normal_attach
time: [11.106 ns 11.133 ns 11.166 ns]
change: [+8.4063% +8.8465% +9.3006%] (p = 0.00 < 0.05)
Performance has regressed.
telemetry_suppression/is_current_telemetry_suppressed_false
time: [743.58 ps 744.81 ps 746.44 ps]
change: [-0.6749% -0.3983% -0.1260%] (p = 0.00 < 0.05)
Change within noise threshold.
Found 21 outliers among 100 measurements (21.00%)
8 (8.00%) low severe
3 (3.00%) low mild
3 (3.00%) high mild
7 (7.00%) high severe
telemetry_suppression/is_current_telemetry_suppressed_true
time: [743.35 ps 744.08 ps 745.10 ps]
change: [-0.4459% -0.1688% +0.0707%] (p = 0.22 > 0.05)
No change in performance detected.
Found 20 outliers among 100 measurements (20.00%)
3 (3.00%) low severe
6 (6.00%) low mild
5 (5.00%) high mild
6 (6.00%) high severeI'm seeing consistent ~10% regression for enter, no-change for checks. |
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That is interesting @cijothomas. What hardware are you running on? |
This was in m4 pro. I can try in a windows box and update back. |
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PR branch: $ cargo bench --bench context_suppression
Finished `bench` profile [optimized + debuginfo] target(s) in 0.13s
Running benches/context_suppression.rs (/tmp/tbd_a/opentelemetry-rust/target/release/deps/context_suppression-3de0ed5c3fd35dc6)
Gnuplot not found, using plotters backend
telemetry_suppression/enter_telemetry_suppressed_scope
time: [26.002 ns 26.039 ns 26.080 ns]
Found 4 outliers among 100 measurements (4.00%)
1 (1.00%) high mild
3 (3.00%) high severe
telemetry_suppression/normal_attach
time: [26.186 ns 26.201 ns 26.218 ns]
Found 11 outliers among 100 measurements (11.00%)
1 (1.00%) low severe
2 (2.00%) low mild
3 (3.00%) high mild
5 (5.00%) high severe
telemetry_suppression/is_current_telemetry_suppressed_false
time: [1.2984 ns 1.3000 ns 1.3016 ns]
Found 6 outliers among 100 measurements (6.00%)
1 (1.00%) low mild
2 (2.00%) high mild
3 (3.00%) high severe
telemetry_suppression/is_current_telemetry_suppressed_true
time: [1.2981 ns 1.3005 ns 1.3030 ns]
Found 8 outliers among 100 measurements (8.00%)
1 (1.00%) low mild
5 (5.00%) high mild
2 (2.00%) high severeMachine Conf: $ lscpu | grep -i core
Model name: AMD EPYC 7763 64-Core Processor
Thread(s) per core: 2
Core(s) per socket: 8
$ cat /proc/meminfo | grep -E '^MemTotal'
MemTotal: 65794236 kB
$ uname -a
Linux CPC-labha-5U0JP 6.6.36.3-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Sat Jun 29 07:01:04 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux |
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Changes
This PR aligns the
Contextstruct and changes aboolinto a flag field. It tries to mitigate the performance impact of #2821 on context attach/detach operations.Merge requirement checklist
CHANGELOG.mdfiles updated for non-trivial, user-facing changes