chore(heap-profiling): remove free USDT when live-heap is not available [PROF-15190]

[scottgerring]

What does this PR do?

When the user does not opt into the live-heap feature, we should not emit the free USDT. This lets an attached profiler know that live heap is not available, making its life easier (e.g., it knows not to track sampled allocations).

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

How to test the change?

Describe here in detail how the change can be validated.

[github-actions]

📚 Documentation Check Results

⚠️ 45 documentation warning(s) found

📦 libdd-profiling-heap-sampler - 45 warning(s)

---

Updated: 2026-07-15 06:49:11 UTC | Commit: 2955c3d | missing-docs job results

[github-actions]

🔒 Cargo Deny Results

✅ No issues found!

📦 libdd-profiling-heap-sampler - ✅ No issues

---

Updated: 2026-07-15 06:51:22 UTC | Commit: 2955c3d | dependency-check job results

[datadog-datadog-prod-us1-2]

 

✨ Fix all issues with BitsAI

⚠️ Warnings

🚦 3 Pipeline jobs failed

Test | Test x86_64-unknown-linux-gnu on centOS7 docker image     

Test | cargo test #ubuntu-latest     

Required checks pass | allchecks     

🧪 1 Test failed in 1 job

Test | test  

ddheap_probes_have_one_note_each from libdd-profiling-heap-gotter-ffi::usdt_notes  

thread 'ddheap_probes_have_one_note_each' panicked at libdd-profiling-heap-gotter-ffi/tests/usdt_notes.rs:32:75

thread 'ddheap_probes_have_one_note_each' panicked at libdd-profiling-heap-gotter-ffi/tests/usdt_notes.rs:32:75:
called \`Result::unwrap()\` on an \`Err\` value: USDT probe 'ddheap:free' has no .note.stapsdt entry
note: run with \`RUST_BACKTRACE=1\` environment variable to display a backtrace

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 74.45% (-0.02%)

Useful? React with 👍 / 👎

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 4556dad | Docs | Datadog PR Page | Give us feedback!}

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Adjusts the heap-sampler USDT probe emission so external profilers can detect whether “live-heap” correlation is supported by checking for the presence/absence of the ddheap:free USDT note.

Changes:

• Gate ddheap:free USDT emission behind DD_HEAP_LIVE_TRACKING in dd_probe_free.
• Stop calling dd_probe_free on the sampled-free slow path when live-heap tracking is disabled.
• Document that the dd_probe_free symbol always exists, but the USDT note is only present with live-heap tracking enabled.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
libdd-profiling-heap-sampler/src/probes.c	Conditionally emits the ddheap:free USDT based on DD_HEAP_LIVE_TRACKING.
libdd-profiling-heap-sampler/src/allocation_freed.c	Skips firing the free probe when live-heap tracking is disabled.
libdd-profiling-heap-sampler/include/datadog/heap/probes.h	Clarifies probe behavior and how external profilers can infer live-heap support.

---

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[pr-commenter]

Benchmarks

Comparison

Benchmark execution time: 2026-07-15 07:02:53

Comparing candidate commit 4556dad in PR branch sgg/no-live-heap-no-probe with baseline commit a10f667 in branch main.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 39 metrics, 0 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

• 🟩 = significantly better candidate vs. baseline
• 🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

scenario:alloc_free/sampled_system_slow_path/4096

• 🟥 execution_time [+9.925ns; +10.057ns] or [+6.771%; +6.861%]

Candidate

Candidate benchmark details

Group 1

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	4556dad	1784097923	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_noop_fast_path/16	execution_time	14.404ns	14.472ns ± 0.016ns	14.471ns ± 0.005ns	14.477ns	14.492ns	14.534ns	14.576ns	0.72%	2.382	15.683	0.11%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/256	execution_time	14.401ns	14.473ns ± 0.013ns	14.472ns ± 0.005ns	14.478ns	14.492ns	14.508ns	14.542ns	0.48%	-0.362	10.682	0.09%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/4096	execution_time	14.401ns	14.474ns ± 0.020ns	14.473ns ± 0.006ns	14.480ns	14.494ns	14.507ns	14.685ns	1.47%	6.142	67.209	0.13%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/64	execution_time	14.401ns	14.474ns ± 0.019ns	14.472ns ± 0.006ns	14.478ns	14.493ns	14.557ns	14.656ns	1.27%	4.708	41.135	0.13%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/65536	execution_time	14.401ns	14.473ns ± 0.015ns	14.472ns ± 0.005ns	14.478ns	14.495ns	14.533ns	14.551ns	0.55%	0.491	9.107	0.11%	0.001ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_noop_fast_path/16	execution_time	[14.470ns; 14.475ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/sampled_noop_fast_path/256	execution_time	[14.471ns; 14.475ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_noop_fast_path/4096	execution_time	[14.472ns; 14.477ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_fast_path/64	execution_time	[14.471ns; 14.476ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_fast_path/65536	execution_time	[14.471ns; 14.475ns] or [-0.015%; +0.015%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	4556dad	1784097923	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/system/16	execution_time	14.001ns	14.304ns ± 0.076ns	14.303ns ± 0.042ns	14.344ns	14.430ns	14.535ns	14.573ns	1.88%	0.079	2.279	0.53%	0.005ns	1	200
alloc_free/system/256	execution_time	14.008ns	14.284ns ± 0.083ns	14.280ns ± 0.040ns	14.317ns	14.414ns	14.523ns	14.663ns	2.68%	0.421	2.909	0.58%	0.006ns	1	200
alloc_free/system/4096	execution_time	87.617ns	89.694ns ± 0.540ns	89.740ns ± 0.297ns	89.997ns	90.502ns	90.851ns	91.304ns	1.74%	-0.540	1.639	0.60%	0.038ns	1	200
alloc_free/system/64	execution_time	14.066ns	14.311ns ± 0.095ns	14.299ns ± 0.048ns	14.352ns	14.476ns	14.619ns	14.746ns	3.12%	1.032	3.057	0.66%	0.007ns	1	200
alloc_free/system/65536	execution_time	87.380ns	88.426ns ± 0.249ns	88.426ns ± 0.093ns	88.505ns	88.730ns	89.168ns	90.144ns	1.94%	1.433	12.908	0.28%	0.018ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/system/16	execution_time	[14.293ns; 14.314ns] or [-0.074%; +0.074%]	None	None	None
alloc_free/system/256	execution_time	[14.272ns; 14.295ns] or [-0.081%; +0.081%]	None	None	None
alloc_free/system/4096	execution_time	[89.619ns; 89.769ns] or [-0.083%; +0.083%]	None	None	None
alloc_free/system/64	execution_time	[14.298ns; 14.324ns] or [-0.092%; +0.092%]	None	None	None
alloc_free/system/65536	execution_time	[88.391ns; 88.460ns] or [-0.039%; +0.039%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	4556dad	1784097923	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sampler_only/slow_path/16	execution_time	61.955ns	62.248ns ± 0.062ns	62.245ns ± 0.023ns	62.265ns	62.326ns	62.490ns	62.590ns	0.55%	0.594	10.761	0.10%	0.004ns	1	200
sampler_only/slow_path/256	execution_time	61.990ns	62.273ns ± 0.054ns	62.272ns ± 0.020ns	62.291ns	62.331ns	62.460ns	62.554ns	0.45%	0.304	9.560	0.09%	0.004ns	1	200
sampler_only/slow_path/4096	execution_time	62.410ns	62.637ns ± 0.131ns	62.624ns ± 0.023ns	62.646ns	62.704ns	62.917ns	64.187ns	2.50%	8.885	98.609	0.21%	0.009ns	1	200
sampler_only/slow_path/64	execution_time	61.907ns	62.257ns ± 0.090ns	62.248ns ± 0.022ns	62.278ns	62.339ns	62.397ns	63.242ns	1.60%	6.171	70.894	0.14%	0.006ns	1	200
sampler_only/slow_path/65536	execution_time	66.492ns	66.810ns ± 0.066ns	66.809ns ± 0.027ns	66.840ns	66.899ns	66.993ns	67.220ns	0.62%	0.501	9.977	0.10%	0.005ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sampler_only/slow_path/16	execution_time	[62.240ns; 62.257ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/slow_path/256	execution_time	[62.266ns; 62.280ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/slow_path/4096	execution_time	[62.619ns; 62.655ns] or [-0.029%; +0.029%]	None	None	None
sampler_only/slow_path/64	execution_time	[62.244ns; 62.269ns] or [-0.020%; +0.020%]	None	None	None
sampler_only/slow_path/65536	execution_time	[66.801ns; 66.820ns] or [-0.014%; +0.014%]	None	None	None

Group 4

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	4556dad	1784097923	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/noop/16	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.403ns	0.405ns	0.78%	1.724	19.623	0.10%	0.000ns	1	200
alloc_free/noop/256	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.406ns	0.94%	2.463	23.391	0.12%	0.000ns	1	200
alloc_free/noop/4096	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.410ns	1.88%	8.019	90.267	0.16%	0.000ns	1	200
alloc_free/noop/64	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.406ns	1.10%	3.598	35.495	0.12%	0.000ns	1	200
alloc_free/noop/65536	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.405ns	0.66%	1.696	14.668	0.10%	0.000ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/noop/16	execution_time	[0.402ns; 0.402ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/noop/256	execution_time	[0.402ns; 0.402ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/noop/4096	execution_time	[0.402ns; 0.402ns] or [-0.022%; +0.022%]	None	None	None
alloc_free/noop/64	execution_time	[0.402ns; 0.402ns] or [-0.017%; +0.017%]	None	None	None
alloc_free/noop/65536	execution_time	[0.402ns; 0.402ns] or [-0.014%; +0.014%]	None	None	None

Group 5

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	4556dad	1784097923	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_system_fast_path/16	execution_time	26.004ns	26.213ns ± 0.074ns	26.207ns ± 0.043ns	26.250ns	26.308ns	26.412ns	26.637ns	1.64%	1.189	6.700	0.28%	0.005ns	1	200
alloc_free/sampled_system_fast_path/256	execution_time	26.000ns	26.212ns ± 0.072ns	26.213ns ± 0.036ns	26.245ns	26.323ns	26.403ns	26.537ns	1.24%	0.355	2.827	0.27%	0.005ns	1	200
alloc_free/sampled_system_fast_path/4096	execution_time	115.388ns	116.433ns ± 0.403ns	116.417ns ± 0.179ns	116.587ns	117.027ns	118.075ns	118.417ns	1.72%	1.577	6.464	0.34%	0.028ns	1	200
alloc_free/sampled_system_fast_path/64	execution_time	25.728ns	26.211ns ± 0.083ns	26.212ns ± 0.036ns	26.248ns	26.307ns	26.381ns	26.750ns	2.05%	0.188	13.431	0.32%	0.006ns	1	200
alloc_free/sampled_system_fast_path/65536	execution_time	98.711ns	100.094ns ± 0.361ns	100.093ns ± 0.155ns	100.242ns	100.630ns	101.012ns	101.691ns	1.60%	0.215	3.500	0.36%	0.026ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_system_fast_path/16	execution_time	[26.202ns; 26.223ns] or [-0.039%; +0.039%]	None	None	None
alloc_free/sampled_system_fast_path/256	execution_time	[26.202ns; 26.222ns] or [-0.038%; +0.038%]	None	None	None
alloc_free/sampled_system_fast_path/4096	execution_time	[116.377ns; 116.489ns] or [-0.048%; +0.048%]	None	None	None
alloc_free/sampled_system_fast_path/64	execution_time	[26.199ns; 26.223ns] or [-0.044%; +0.044%]	None	None	None
alloc_free/sampled_system_fast_path/65536	execution_time	[100.044ns; 100.144ns] or [-0.050%; +0.050%]	None	None	None

Group 6

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	4556dad	1784097923	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_noop_slow_path/16	execution_time	63.768ns	64.055ns ± 0.081ns	64.052ns ± 0.025ns	64.077ns	64.141ns	64.226ns	64.858ns	1.26%	4.539	49.354	0.13%	0.006ns	1	200
alloc_free/sampled_noop_slow_path/256	execution_time	63.348ns	63.786ns ± 0.059ns	63.783ns ± 0.023ns	63.806ns	63.862ns	63.957ns	64.112ns	0.52%	-0.411	20.311	0.09%	0.004ns	1	200
alloc_free/sampled_noop_slow_path/4096	execution_time	64.090ns	64.441ns ± 0.071ns	64.435ns ± 0.024ns	64.460ns	64.527ns	64.657ns	64.844ns	0.63%	1.117	11.827	0.11%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/64	execution_time	63.643ns	64.049ns ± 0.058ns	64.049ns ± 0.021ns	64.070ns	64.110ns	64.207ns	64.363ns	0.49%	-0.901	17.626	0.09%	0.004ns	1	200
alloc_free/sampled_noop_slow_path/65536	execution_time	68.442ns	68.708ns ± 0.088ns	68.702ns ± 0.031ns	68.735ns	68.783ns	69.193ns	69.374ns	0.98%	3.574	24.033	0.13%	0.006ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_noop_slow_path/16	execution_time	[64.044ns; 64.067ns] or [-0.017%; +0.017%]	None	None	None
alloc_free/sampled_noop_slow_path/256	execution_time	[63.778ns; 63.794ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_noop_slow_path/4096	execution_time	[64.431ns; 64.451ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_noop_slow_path/64	execution_time	[64.041ns; 64.057ns] or [-0.012%; +0.012%]	None	None	None
alloc_free/sampled_noop_slow_path/65536	execution_time	[68.696ns; 68.720ns] or [-0.018%; +0.018%]	None	None	None

Group 7

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	4556dad	1784097923	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_system_slow_path/16	execution_time	89.131ns	89.660ns ± 0.096ns	89.658ns ± 0.037ns	89.696ns	89.774ns	89.936ns	90.153ns	0.55%	-0.093	9.914	0.11%	0.007ns	1	200
alloc_free/sampled_system_slow_path/256	execution_time	89.364ns	89.647ns ± 0.105ns	89.635ns ± 0.031ns	89.665ns	89.785ns	90.085ns	90.481ns	0.94%	3.881	24.890	0.12%	0.007ns	1	200
alloc_free/sampled_system_slow_path/4096	execution_time	154.511ns	156.573ns ± 0.383ns	156.559ns ± 0.158ns	156.738ns	156.985ns	157.500ns	158.948ns	1.53%	0.100	11.999	0.24%	0.027ns	1	200
alloc_free/sampled_system_slow_path/64	execution_time	89.068ns	89.667ns ± 0.111ns	89.663ns ± 0.033ns	89.697ns	89.805ns	90.082ns	90.283ns	0.69%	0.077	12.152	0.12%	0.008ns	1	200
alloc_free/sampled_system_slow_path/65536	execution_time	154.964ns	155.767ns ± 0.385ns	155.755ns ± 0.106ns	155.855ns	156.071ns	156.396ns	160.290ns	2.91%	8.060	93.785	0.25%	0.027ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_system_slow_path/16	execution_time	[89.647ns; 89.674ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_system_slow_path/256	execution_time	[89.633ns; 89.662ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/sampled_system_slow_path/4096	execution_time	[156.520ns; 156.626ns] or [-0.034%; +0.034%]	None	None	None
alloc_free/sampled_system_slow_path/64	execution_time	[89.652ns; 89.683ns] or [-0.017%; +0.017%]	None	None	None
alloc_free/sampled_system_slow_path/65536	execution_time	[155.713ns; 155.820ns] or [-0.034%; +0.034%]	None	None	None

Group 8

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	4556dad	1784097923	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sampler_only/fast_path/16	execution_time	13.603ns	13.669ns ± 0.014ns	13.667ns ± 0.006ns	13.674ns	13.687ns	13.710ns	13.760ns	0.68%	1.328	12.074	0.10%	0.001ns	1	200
sampler_only/fast_path/256	execution_time	13.601ns	13.669ns ± 0.022ns	13.668ns ± 0.005ns	13.674ns	13.688ns	13.705ns	13.911ns	1.78%	6.898	78.343	0.16%	0.002ns	1	200
sampler_only/fast_path/4096	execution_time	13.602ns	13.669ns ± 0.018ns	13.667ns ± 0.005ns	13.672ns	13.692ns	13.714ns	13.855ns	1.37%	5.652	57.052	0.13%	0.001ns	1	200
sampler_only/fast_path/64	execution_time	13.602ns	13.669ns ± 0.022ns	13.667ns ± 0.004ns	13.673ns	13.684ns	13.714ns	13.936ns	1.97%	8.687	102.044	0.16%	0.002ns	1	200
sampler_only/fast_path/65536	execution_time	13.601ns	13.669ns ± 0.013ns	13.668ns ± 0.005ns	13.673ns	13.686ns	13.707ns	13.752ns	0.62%	0.983	15.382	0.10%	0.001ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sampler_only/fast_path/16	execution_time	[13.667ns; 13.671ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/fast_path/256	execution_time	[13.666ns; 13.672ns] or [-0.022%; +0.022%]	None	None	None
sampler_only/fast_path/4096	execution_time	[13.667ns; 13.672ns] or [-0.018%; +0.018%]	None	None	None
sampler_only/fast_path/64	execution_time	[13.666ns; 13.673ns] or [-0.023%; +0.023%]	None	None	None
sampler_only/fast_path/65536	execution_time	[13.667ns; 13.671ns] or [-0.014%; +0.014%]	None	None	None

Baseline

Baseline benchmark details

Group 1

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a10f667	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_noop_fast_path/16	execution_time	14.402ns	14.473ns ± 0.014ns	14.473ns ± 0.005ns	14.478ns	14.490ns	14.510ns	14.556ns	0.57%	0.346	12.261	0.10%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/256	execution_time	14.403ns	14.471ns ± 0.012ns	14.471ns ± 0.005ns	14.476ns	14.490ns	14.506ns	14.519ns	0.33%	-0.117	7.279	0.08%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/4096	execution_time	14.402ns	14.473ns ± 0.015ns	14.471ns ± 0.005ns	14.477ns	14.496ns	14.523ns	14.546ns	0.52%	0.366	9.186	0.10%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/64	execution_time	14.401ns	14.473ns ± 0.020ns	14.470ns ± 0.005ns	14.477ns	14.491ns	14.533ns	14.675ns	1.41%	5.190	52.948	0.14%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/65536	execution_time	14.406ns	14.473ns ± 0.019ns	14.472ns ± 0.006ns	14.477ns	14.492ns	14.511ns	14.694ns	1.54%	7.299	83.166	0.13%	0.001ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_noop_fast_path/16	execution_time	[14.471ns; 14.475ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_noop_fast_path/256	execution_time	[14.470ns; 14.473ns] or [-0.011%; +0.011%]	None	None	None
alloc_free/sampled_noop_fast_path/4096	execution_time	[14.471ns; 14.475ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_fast_path/64	execution_time	[14.470ns; 14.475ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_fast_path/65536	execution_time	[14.471ns; 14.476ns] or [-0.019%; +0.019%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a10f667	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/system/16	execution_time	14.065ns	14.303ns ± 0.082ns	14.296ns ± 0.041ns	14.340ns	14.453ns	14.571ns	14.664ns	2.57%	1.278	3.753	0.57%	0.006ns	1	200
alloc_free/system/256	execution_time	14.002ns	14.305ns ± 0.122ns	14.299ns ± 0.043ns	14.338ns	14.432ns	14.466ns	15.624ns	9.27%	6.265	67.401	0.85%	0.009ns	1	200
alloc_free/system/4096	execution_time	89.561ns	92.070ns ± 0.608ns	92.036ns ± 0.287ns	92.335ns	92.837ns	93.664ns	96.614ns	4.97%	2.012	16.409	0.66%	0.043ns	1	200
alloc_free/system/64	execution_time	14.057ns	14.296ns ± 0.097ns	14.286ns ± 0.048ns	14.342ns	14.468ns	14.527ns	14.730ns	3.11%	0.676	2.567	0.68%	0.007ns	1	200
alloc_free/system/65536	execution_time	86.933ns	88.377ns ± 0.255ns	88.392ns ± 0.107ns	88.496ns	88.645ns	89.020ns	89.616ns	1.38%	-0.512	8.662	0.29%	0.018ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/system/16	execution_time	[14.292ns; 14.315ns] or [-0.079%; +0.079%]	None	None	None
alloc_free/system/256	execution_time	[14.288ns; 14.322ns] or [-0.118%; +0.118%]	None	None	None
alloc_free/system/4096	execution_time	[91.986ns; 92.154ns] or [-0.092%; +0.092%]	None	None	None
alloc_free/system/64	execution_time	[14.282ns; 14.309ns] or [-0.094%; +0.094%]	None	None	None
alloc_free/system/65536	execution_time	[88.342ns; 88.412ns] or [-0.040%; +0.040%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a10f667	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sampler_only/slow_path/16	execution_time	62.067ns	62.276ns ± 0.107ns	62.264ns ± 0.025ns	62.291ns	62.375ns	62.517ns	63.237ns	1.56%	6.108	49.549	0.17%	0.008ns	1	200
sampler_only/slow_path/256	execution_time	62.127ns	62.300ns ± 0.078ns	62.292ns ± 0.025ns	62.316ns	62.398ns	62.521ns	63.063ns	1.24%	5.175	45.213	0.13%	0.006ns	1	200
sampler_only/slow_path/4096	execution_time	62.445ns	62.641ns ± 0.054ns	62.639ns ± 0.024ns	62.664ns	62.719ns	62.788ns	63.002ns	0.58%	1.607	10.764	0.09%	0.004ns	1	200
sampler_only/slow_path/64	execution_time	61.988ns	62.266ns ± 0.060ns	62.262ns ± 0.025ns	62.287ns	62.333ns	62.501ns	62.662ns	0.64%	2.016	14.123	0.10%	0.004ns	1	200
sampler_only/slow_path/65536	execution_time	66.172ns	66.808ns ± 0.090ns	66.809ns ± 0.033ns	66.843ns	66.923ns	67.091ns	67.247ns	0.66%	-1.051	15.481	0.13%	0.006ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sampler_only/slow_path/16	execution_time	[62.261ns; 62.291ns] or [-0.024%; +0.024%]	None	None	None
sampler_only/slow_path/256	execution_time	[62.289ns; 62.311ns] or [-0.017%; +0.017%]	None	None	None
sampler_only/slow_path/4096	execution_time	[62.633ns; 62.648ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/slow_path/64	execution_time	[62.258ns; 62.274ns] or [-0.013%; +0.013%]	None	None	None
sampler_only/slow_path/65536	execution_time	[66.796ns; 66.821ns] or [-0.019%; +0.019%]	None	None	None

Group 4

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a10f667	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/noop/16	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.403ns	0.404ns	0.44%	-0.262	10.021	0.09%	0.000ns	1	200
alloc_free/noop/256	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.410ns	2.00%	7.542	77.576	0.18%	0.000ns	1	200
alloc_free/noop/4096	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.405ns	0.75%	2.417	19.638	0.11%	0.000ns	1	200
alloc_free/noop/64	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.404ns	0.50%	0.402	9.003	0.10%	0.000ns	1	200
alloc_free/noop/65536	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.408ns	1.50%	6.597	70.631	0.14%	0.000ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/noop/16	execution_time	[0.402ns; 0.402ns] or [-0.012%; +0.012%]	None	None	None
alloc_free/noop/256	execution_time	[0.402ns; 0.402ns] or [-0.025%; +0.025%]	None	None	None
alloc_free/noop/4096	execution_time	[0.402ns; 0.402ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/noop/64	execution_time	[0.402ns; 0.402ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/noop/65536	execution_time	[0.402ns; 0.402ns] or [-0.019%; +0.019%]	None	None	None

Group 5

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a10f667	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_system_fast_path/16	execution_time	25.942ns	26.208ns ± 0.086ns	26.203ns ± 0.040ns	26.244ns	26.316ns	26.479ns	26.700ns	1.90%	1.458	8.779	0.33%	0.006ns	1	200
alloc_free/sampled_system_fast_path/256	execution_time	25.978ns	26.212ns ± 0.072ns	26.207ns ± 0.040ns	26.248ns	26.319ns	26.412ns	26.510ns	1.15%	0.555	2.756	0.27%	0.005ns	1	200
alloc_free/sampled_system_fast_path/4096	execution_time	115.284ns	116.237ns ± 0.404ns	116.203ns ± 0.194ns	116.397ns	116.884ns	117.289ns	119.178ns	2.56%	2.296	13.910	0.35%	0.029ns	1	200
alloc_free/sampled_system_fast_path/64	execution_time	25.825ns	26.211ns ± 0.088ns	26.207ns ± 0.036ns	26.243ns	26.323ns	26.383ns	26.956ns	2.86%	2.721	26.499	0.33%	0.006ns	1	200
alloc_free/sampled_system_fast_path/65536	execution_time	98.543ns	100.365ns ± 0.344ns	100.377ns ± 0.175ns	100.523ns	100.824ns	101.454ns	101.622ns	1.24%	-0.358	5.212	0.34%	0.024ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_system_fast_path/16	execution_time	[26.196ns; 26.220ns] or [-0.045%; +0.045%]	None	None	None
alloc_free/sampled_system_fast_path/256	execution_time	[26.202ns; 26.222ns] or [-0.038%; +0.038%]	None	None	None
alloc_free/sampled_system_fast_path/4096	execution_time	[116.181ns; 116.293ns] or [-0.048%; +0.048%]	None	None	None
alloc_free/sampled_system_fast_path/64	execution_time	[26.199ns; 26.223ns] or [-0.046%; +0.046%]	None	None	None
alloc_free/sampled_system_fast_path/65536	execution_time	[100.317ns; 100.412ns] or [-0.047%; +0.047%]	None	None	None

Group 6

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a10f667	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_noop_slow_path/16	execution_time	63.940ns	64.129ns ± 0.101ns	64.117ns ± 0.025ns	64.143ns	64.210ns	64.422ns	65.239ns	1.75%	7.546	75.382	0.16%	0.007ns	1	200
alloc_free/sampled_noop_slow_path/256	execution_time	63.789ns	64.143ns ± 0.059ns	64.144ns ± 0.026ns	64.170ns	64.233ns	64.301ns	64.341ns	0.31%	-0.895	7.151	0.09%	0.004ns	1	200
alloc_free/sampled_noop_slow_path/4096	execution_time	64.304ns	64.507ns ± 0.090ns	64.498ns ± 0.026ns	64.528ns	64.604ns	64.641ns	65.559ns	1.64%	8.128	92.275	0.14%	0.006ns	1	200
alloc_free/sampled_noop_slow_path/64	execution_time	63.800ns	64.128ns ± 0.080ns	64.119ns ± 0.023ns	64.143ns	64.223ns	64.342ns	64.892ns	1.20%	4.297	41.553	0.12%	0.006ns	1	200
alloc_free/sampled_noop_slow_path/65536	execution_time	68.234ns	68.749ns ± 0.078ns	68.751ns ± 0.030ns	68.780ns	68.857ns	68.969ns	69.013ns	0.38%	-1.622	11.731	0.11%	0.006ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_noop_slow_path/16	execution_time	[64.115ns; 64.143ns] or [-0.022%; +0.022%]	None	None	None
alloc_free/sampled_noop_slow_path/256	execution_time	[64.135ns; 64.151ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_noop_slow_path/4096	execution_time	[64.494ns; 64.519ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_slow_path/64	execution_time	[64.117ns; 64.139ns] or [-0.017%; +0.017%]	None	None	None
alloc_free/sampled_noop_slow_path/65536	execution_time	[68.738ns; 68.760ns] or [-0.016%; +0.016%]	None	None	None

Group 7

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a10f667	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_system_slow_path/16	execution_time	89.958ns	90.475ns ± 0.094ns	90.472ns ± 0.038ns	90.512ns	90.563ns	90.722ns	91.220ns	0.83%	2.017	23.030	0.10%	0.007ns	1	200
alloc_free/sampled_system_slow_path/256	execution_time	89.981ns	90.523ns ± 0.096ns	90.517ns ± 0.035ns	90.557ns	90.644ns	90.761ns	91.184ns	0.74%	0.418	17.735	0.11%	0.007ns	1	200
alloc_free/sampled_system_slow_path/4096	execution_time	145.395ns	146.582ns ± 0.283ns	146.583ns ± 0.130ns	146.698ns	147.046ns	147.455ns	147.814ns	0.84%	0.132	5.253	0.19%	0.020ns	1	200
alloc_free/sampled_system_slow_path/64	execution_time	89.858ns	90.362ns ± 0.093ns	90.358ns ± 0.035ns	90.389ns	90.479ns	90.666ns	90.905ns	0.61%	1.124	12.596	0.10%	0.007ns	1	200
alloc_free/sampled_system_slow_path/65536	execution_time	154.840ns	155.784ns ± 0.249ns	155.765ns ± 0.105ns	155.874ns	156.162ns	156.442ns	157.365ns	1.03%	1.503	9.690	0.16%	0.018ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_system_slow_path/16	execution_time	[90.462ns; 90.488ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_system_slow_path/256	execution_time	[90.509ns; 90.536ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_system_slow_path/4096	execution_time	[146.543ns; 146.621ns] or [-0.027%; +0.027%]	None	None	None
alloc_free/sampled_system_slow_path/64	execution_time	[90.349ns; 90.375ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_system_slow_path/65536	execution_time	[155.750ns; 155.818ns] or [-0.022%; +0.022%]	None	None	None

Group 8

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a10f667	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sampler_only/fast_path/16	execution_time	13.601ns	13.668ns ± 0.018ns	13.667ns ± 0.005ns	13.673ns	13.684ns	13.706ns	13.839ns	1.26%	4.882	45.551	0.13%	0.001ns	1	200
sampler_only/fast_path/256	execution_time	13.602ns	13.670ns ± 0.014ns	13.668ns ± 0.005ns	13.674ns	13.691ns	13.716ns	13.760ns	0.68%	1.063	14.258	0.10%	0.001ns	1	200
sampler_only/fast_path/4096	execution_time	13.606ns	13.668ns ± 0.013ns	13.668ns ± 0.005ns	13.673ns	13.681ns	13.713ns	13.757ns	0.65%	1.544	15.401	0.09%	0.001ns	1	200
sampler_only/fast_path/64	execution_time	13.601ns	13.669ns ± 0.022ns	13.667ns ± 0.005ns	13.673ns	13.687ns	13.707ns	13.888ns	1.61%	6.489	58.718	0.16%	0.002ns	1	200
sampler_only/fast_path/65536	execution_time	13.603ns	13.669ns ± 0.015ns	13.668ns ± 0.005ns	13.673ns	13.692ns	13.717ns	13.772ns	0.76%	1.318	13.959	0.11%	0.001ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sampler_only/fast_path/16	execution_time	[13.666ns; 13.671ns] or [-0.018%; +0.018%]	None	None	None
sampler_only/fast_path/256	execution_time	[13.668ns; 13.672ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/fast_path/4096	execution_time	[13.666ns; 13.670ns] or [-0.013%; +0.013%]	None	None	None
sampler_only/fast_path/64	execution_time	[13.666ns; 13.672ns] or [-0.022%; +0.022%]	None	None	None
sampler_only/fast_path/65536	execution_time	[13.667ns; 13.671ns] or [-0.015%; +0.015%]	None	None	None

[dd-octo-sts]

Artifact Size Benchmark Report

aarch64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.so	7.88 MB	7.88 MB	0% (0 B) 👌
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.a	85.88 MB	85.88 MB	0% (0 B) 👌

aarch64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.a	97.10 MB	97.10 MB	0% (0 B) 👌
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.61 MB	10.61 MB	0% (0 B) 👌

libdatadog-x64-windows

Artifact	Baseline	Commit	Change
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.dll	25.45 MB	25.45 MB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.lib	88.44 KB	88.44 KB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.pdb	184.54 MB	184.55 MB	+0% (+8.00 KB) 👌
/libdatadog-x64-windows/debug/static/datadog_profiling_ffi.lib	946.77 MB	946.77 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.dll	8.32 MB	8.32 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.lib	88.44 KB	88.44 KB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.pdb	24.62 MB	24.62 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/static/datadog_profiling_ffi.lib	49.03 MB	49.03 MB	0% (0 B) 👌

libdatadog-x86-windows

Artifact	Baseline	Commit	Change
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.dll	22.05 MB	22.05 MB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.lib	89.82 KB	89.82 KB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.pdb	188.76 MB	188.76 MB	0% (0 B) 👌
/libdatadog-x86-windows/debug/static/datadog_profiling_ffi.lib	935.45 MB	935.45 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.dll	6.43 MB	6.43 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.lib	89.82 KB	89.82 KB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.pdb	26.43 MB	26.43 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/static/datadog_profiling_ffi.lib	46.66 MB	46.66 MB	0% (0 B) 👌

x86_64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.a	76.58 MB	76.58 MB	0% (0 B) 👌
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.so	8.78 MB	8.78 MB	0% (0 B) 👌

x86_64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.a	92.10 MB	92.10 MB	0% (0 B) 👌
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.69 MB	10.69 MB	0% (0 B) 👌

[danielsn]

is there a test for this

[scottgerring]

added