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

⚠️ 44 documentation warning(s) found

📦 libdd-profiling-heap-sampler - 44 warning(s)

---

Updated: 2026-07-10 15:33:23 UTC | Commit: 364bc66 | missing-docs job results

[github-actions]

🔒 Cargo Deny Results

✅ No issues found!

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

---

Updated: 2026-07-10 15:35:11 UTC | Commit: 364bc66 | dependency-check job results

[datadog-datadog-prod-us1-2]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 74.32% (-0.00%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 9f3653e | 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: 2026-07-10 15:50:30

Comparing candidate commit 9f3653e in PR branch sgg/no-live-heap-no-probe with baseline commit a41a0f4 in branch main.

Found 1 performance improvements and 1 performance regressions! Performance is the same for 38 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_fast_path/4096

• 🟥 execution_time [+11.566ns; +11.902ns] or [+12.497%; +12.860%]

scenario:alloc_free/system/4096

• 🟩 execution_time [-16.258ns; -16.033ns] or [-15.342%; -15.131%]

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	9f3653e	1783697425	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	26.003ns	26.611ns ± 0.135ns	26.603ns ± 0.072ns	26.682ns	26.835ns	27.008ns	27.064ns	1.73%	-0.044	3.089	0.51%	0.010ns	1	200
alloc_free/sampled_system_fast_path/256	execution_time	26.063ns	26.645ns ± 0.133ns	26.648ns ± 0.055ns	26.700ns	26.850ns	26.989ns	27.360ns	2.67%	0.069	6.513	0.50%	0.009ns	1	200
alloc_free/sampled_system_fast_path/4096	execution_time	102.018ns	104.285ns ± 1.188ns	104.198ns ± 0.162ns	104.372ns	104.808ns	105.943ns	119.915ns	15.08%	11.453	148.554	1.14%	0.084ns	1	200
alloc_free/sampled_system_fast_path/64	execution_time	26.348ns	26.655ns ± 0.118ns	26.655ns ± 0.058ns	26.710ns	26.846ns	26.928ns	27.364ns	2.66%	1.049	5.924	0.44%	0.008ns	1	200
alloc_free/sampled_system_fast_path/65536	execution_time	99.859ns	101.052ns ± 0.359ns	101.071ns ± 0.155ns	101.218ns	101.547ns	101.758ns	102.862ns	1.77%	0.358	5.329	0.35%	0.025ns	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	[26.592ns; 26.630ns] or [-0.071%; +0.071%]	None	None	None
alloc_free/sampled_system_fast_path/256	execution_time	[26.627ns; 26.664ns] or [-0.069%; +0.069%]	None	None	None
alloc_free/sampled_system_fast_path/4096	execution_time	[104.120ns; 104.449ns] or [-0.158%; +0.158%]	None	None	None
alloc_free/sampled_system_fast_path/64	execution_time	[26.639ns; 26.672ns] or [-0.062%; +0.062%]	None	None	None
alloc_free/sampled_system_fast_path/65536	execution_time	[101.003ns; 101.102ns] or [-0.049%; +0.049%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	9f3653e	1783697425	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	0.403ns	0.403ns	0.404ns	0.51%	0.895	10.448	0.08%	0.000ns	1	200
alloc_free/noop/256	execution_time	0.400ns	0.402ns ± 0.003ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.442ns	10.05%	13.761	189.908	0.71%	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	0.407ns	1.21%	4.284	39.147	0.13%	0.000ns	1	200
alloc_free/noop/64	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.403ns	0.403ns	0.35%	-1.183	11.519	0.08%	0.000ns	1	200
alloc_free/noop/65536	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.405ns	0.406ns	0.97%	4.188	30.176	0.12%	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; 0.403ns] or [-0.099%; +0.099%]	None	None	None
alloc_free/noop/4096	execution_time	[0.402ns; 0.402ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/noop/64	execution_time	[0.402ns; 0.402ns] or [-0.011%; +0.011%]	None	None	None
alloc_free/noop/65536	execution_time	[0.402ns; 0.402ns] or [-0.017%; +0.017%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	9f3653e	1783697425	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	83.070ns	83.318ns ± 0.080ns	83.308ns ± 0.026ns	83.341ns	83.417ns	83.631ns	83.908ns	0.72%	2.774	17.449	0.10%	0.006ns	1	200
alloc_free/sampled_system_slow_path/256	execution_time	82.502ns	83.272ns ± 0.095ns	83.272ns ± 0.028ns	83.301ns	83.372ns	83.506ns	83.816ns	0.65%	-1.569	26.545	0.11%	0.007ns	1	200
alloc_free/sampled_system_slow_path/4096	execution_time	153.751ns	154.502ns ± 0.259ns	154.485ns ± 0.118ns	154.599ns	154.861ns	155.369ns	155.978ns	0.97%	1.968	9.298	0.17%	0.018ns	1	200
alloc_free/sampled_system_slow_path/64	execution_time	82.829ns	83.359ns ± 0.104ns	83.355ns ± 0.027ns	83.385ns	83.457ns	83.610ns	84.345ns	1.19%	3.355	42.983	0.12%	0.007ns	1	200
alloc_free/sampled_system_slow_path/65536	execution_time	154.766ns	155.514ns ± 0.167ns	155.502ns ± 0.070ns	155.574ns	155.769ns	156.009ns	156.509ns	0.65%	0.810	8.906	0.11%	0.012ns	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	[83.307ns; 83.330ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_system_slow_path/256	execution_time	[83.259ns; 83.285ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/sampled_system_slow_path/4096	execution_time	[154.466ns; 154.537ns] or [-0.023%; +0.023%]	None	None	None
alloc_free/sampled_system_slow_path/64	execution_time	[83.344ns; 83.373ns] or [-0.017%; +0.017%]	None	None	None
alloc_free/sampled_system_slow_path/65536	execution_time	[155.491ns; 155.537ns] or [-0.015%; +0.015%]	None	None	None

Group 4

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	9f3653e	1783697425	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	60.761ns	60.978ns ± 0.063ns	60.975ns ± 0.022ns	60.997ns	61.053ns	61.244ns	61.405ns	0.71%	2.572	15.949	0.10%	0.004ns	1	200
sampler_only/slow_path/256	execution_time	60.653ns	61.001ns ± 0.087ns	60.991ns ± 0.021ns	61.017ns	61.068ns	61.243ns	61.935ns	1.55%	6.349	68.390	0.14%	0.006ns	1	200
sampler_only/slow_path/4096	execution_time	61.182ns	61.348ns ± 0.053ns	61.347ns ± 0.027ns	61.372ns	61.415ns	61.555ns	61.614ns	0.43%	1.188	6.369	0.09%	0.004ns	1	200
sampler_only/slow_path/64	execution_time	60.736ns	60.991ns ± 0.199ns	60.974ns ± 0.022ns	60.999ns	61.056ns	61.144ns	63.707ns	4.48%	12.764	171.713	0.33%	0.014ns	1	200
sampler_only/slow_path/65536	execution_time	65.007ns	65.323ns ± 0.096ns	65.316ns ± 0.046ns	65.368ns	65.480ns	65.569ns	65.818ns	0.77%	0.702	4.030	0.15%	0.007ns	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	[60.969ns; 60.986ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/slow_path/256	execution_time	[60.989ns; 61.013ns] or [-0.020%; +0.020%]	None	None	None
sampler_only/slow_path/4096	execution_time	[61.340ns; 61.355ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/slow_path/64	execution_time	[60.964ns; 61.019ns] or [-0.045%; +0.045%]	None	None	None
sampler_only/slow_path/65536	execution_time	[65.310ns; 65.337ns] or [-0.020%; +0.020%]	None	None	None

Group 5

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	9f3653e	1783697425	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	14.401ns	14.475ns ± 0.055ns	14.471ns ± 0.005ns	14.476ns	14.495ns	14.522ns	15.219ns	5.17%	12.707	170.710	0.38%	0.004ns	1	200
alloc_free/sampled_noop_fast_path/256	execution_time	14.401ns	14.472ns ± 0.020ns	14.471ns ± 0.005ns	14.476ns	14.490ns	14.514ns	14.685ns	1.48%	6.363	66.852	0.14%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/4096	execution_time	14.402ns	14.471ns ± 0.017ns	14.471ns ± 0.005ns	14.475ns	14.491ns	14.534ns	14.576ns	0.73%	1.360	14.288	0.12%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/64	execution_time	14.403ns	14.472ns ± 0.013ns	14.471ns ± 0.005ns	14.476ns	14.491ns	14.503ns	14.553ns	0.56%	0.668	11.159	0.09%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/65536	execution_time	14.401ns	14.473ns ± 0.015ns	14.473ns ± 0.005ns	14.477ns	14.492ns	14.521ns	14.545ns	0.50%	0.266	8.393	0.10%	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	[14.468ns; 14.483ns] or [-0.052%; +0.052%]	None	None	None
alloc_free/sampled_noop_fast_path/256	execution_time	[14.470ns; 14.475ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_fast_path/4096	execution_time	[14.469ns; 14.473ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/sampled_noop_fast_path/64	execution_time	[14.470ns; 14.473ns] or [-0.012%; +0.012%]	None	None	None
alloc_free/sampled_noop_fast_path/65536	execution_time	[14.471ns; 14.475ns] or [-0.014%; +0.014%]	None	None	None

Group 6

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	9f3653e	1783697425	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	61.577ns	62.003ns ± 0.069ns	62.002ns ± 0.030ns	62.033ns	62.096ns	62.234ns	62.373ns	0.60%	-0.288	11.833	0.11%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/256	execution_time	61.534ns	61.770ns ± 0.073ns	61.763ns ± 0.024ns	61.790ns	61.852ns	61.983ns	62.411ns	1.05%	3.618	29.920	0.12%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/4096	execution_time	61.980ns	62.380ns ± 0.085ns	62.376ns ± 0.025ns	62.399ns	62.448ns	62.620ns	63.296ns	1.47%	6.100	69.939	0.14%	0.006ns	1	200
alloc_free/sampled_noop_slow_path/64	execution_time	61.791ns	62.005ns ± 0.064ns	62.004ns ± 0.029ns	62.032ns	62.090ns	62.176ns	62.418ns	0.67%	1.372	9.574	0.10%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/65536	execution_time	65.935ns	66.497ns ± 0.086ns	66.491ns ± 0.036ns	66.532ns	66.631ns	66.739ns	66.905ns	0.62%	-0.444	11.862	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	[61.993ns; 62.013ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_noop_slow_path/256	execution_time	[61.760ns; 61.781ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/sampled_noop_slow_path/4096	execution_time	[62.369ns; 62.392ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_slow_path/64	execution_time	[61.996ns; 62.014ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_slow_path/65536	execution_time	[66.485ns; 66.509ns] 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	9f3653e	1783697425	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	14.002ns	14.264ns ± 0.088ns	14.261ns ± 0.038ns	14.299ns	14.375ns	14.526ns	14.800ns	3.78%	1.006	7.966	0.62%	0.006ns	1	200
alloc_free/system/256	execution_time	14.099ns	14.297ns ± 0.064ns	14.290ns ± 0.033ns	14.327ns	14.416ns	14.494ns	14.563ns	1.91%	0.887	2.583	0.44%	0.004ns	1	200
alloc_free/system/4096	execution_time	87.226ns	89.821ns ± 0.666ns	89.815ns ± 0.372ns	90.189ns	90.860ns	91.872ns	92.560ns	3.06%	0.381	3.462	0.74%	0.047ns	1	200
alloc_free/system/64	execution_time	14.007ns	14.294ns ± 0.080ns	14.286ns ± 0.038ns	14.333ns	14.409ns	14.489ns	14.911ns	4.38%	2.131	17.248	0.56%	0.006ns	1	200
alloc_free/system/65536	execution_time	86.647ns	88.304ns ± 0.287ns	88.308ns ± 0.143ns	88.445ns	88.676ns	88.963ns	89.851ns	1.75%	-0.091	9.614	0.32%	0.020ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/system/16	execution_time	[14.252ns; 14.276ns] or [-0.085%; +0.085%]	None	None	None
alloc_free/system/256	execution_time	[14.288ns; 14.306ns] or [-0.062%; +0.062%]	None	None	None
alloc_free/system/4096	execution_time	[89.728ns; 89.913ns] or [-0.103%; +0.103%]	None	None	None
alloc_free/system/64	execution_time	[14.283ns; 14.305ns] or [-0.078%; +0.078%]	None	None	None
alloc_free/system/65536	execution_time	[88.264ns; 88.343ns] or [-0.045%; +0.045%]	None	None	None

Group 8

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	9f3653e	1783697425	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	13.601ns	13.669ns ± 0.014ns	13.668ns ± 0.005ns	13.673ns	13.687ns	13.725ns	13.743ns	0.55%	0.840	10.187	0.11%	0.001ns	1	200
sampler_only/fast_path/256	execution_time	13.601ns	13.670ns ± 0.023ns	13.667ns ± 0.004ns	13.671ns	13.692ns	13.705ns	13.947ns	2.04%	8.744	102.091	0.17%	0.002ns	1	200
sampler_only/fast_path/4096	execution_time	13.603ns	13.670ns ± 0.016ns	13.669ns ± 0.005ns	13.673ns	13.685ns	13.715ns	13.838ns	1.24%	5.486	56.179	0.12%	0.001ns	1	200
sampler_only/fast_path/64	execution_time	13.604ns	13.668ns ± 0.014ns	13.666ns ± 0.004ns	13.670ns	13.685ns	13.712ns	13.774ns	0.79%	2.632	20.958	0.10%	0.001ns	1	200
sampler_only/fast_path/65536	execution_time	13.601ns	13.669ns ± 0.021ns	13.668ns ± 0.005ns	13.672ns	13.688ns	13.716ns	13.912ns	1.79%	7.408	84.592	0.16%	0.002ns	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 [-0.015%; +0.015%]	None	None	None
sampler_only/fast_path/256	execution_time	[13.667ns; 13.673ns] or [-0.023%; +0.023%]	None	None	None
sampler_only/fast_path/4096	execution_time	[13.668ns; 13.673ns] or [-0.017%; +0.017%]	None	None	None
sampler_only/fast_path/64	execution_time	[13.666ns; 13.670ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/fast_path/65536	execution_time	[13.666ns; 13.672ns] or [-0.022%; +0.022%]	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	a41a0f4	1783685334	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	25.995ns	26.641ns ± 0.123ns	26.651ns ± 0.062ns	26.710ns	26.802ns	26.903ns	26.936ns	1.07%	-1.329	4.732	0.46%	0.009ns	1	200
alloc_free/sampled_system_fast_path/256	execution_time	26.058ns	26.647ns ± 0.138ns	26.654ns ± 0.072ns	26.722ns	26.830ns	26.978ns	27.265ns	2.30%	-0.234	4.975	0.52%	0.010ns	1	200
alloc_free/sampled_system_fast_path/4096	execution_time	91.925ns	92.551ns ± 0.248ns	92.557ns ± 0.112ns	92.652ns	92.811ns	93.102ns	94.262ns	1.84%	2.822	18.446	0.27%	0.018ns	1	200
alloc_free/sampled_system_fast_path/64	execution_time	26.080ns	26.645ns ± 0.141ns	26.651ns ± 0.072ns	26.718ns	26.845ns	26.994ns	27.199ns	2.06%	-0.302	2.855	0.53%	0.010ns	1	200
alloc_free/sampled_system_fast_path/65536	execution_time	99.952ns	101.098ns ± 0.309ns	101.090ns ± 0.170ns	101.271ns	101.552ns	101.917ns	102.350ns	1.25%	0.158	2.039	0.30%	0.022ns	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	[26.624ns; 26.658ns] or [-0.064%; +0.064%]	None	None	None
alloc_free/sampled_system_fast_path/256	execution_time	[26.628ns; 26.666ns] or [-0.072%; +0.072%]	None	None	None
alloc_free/sampled_system_fast_path/4096	execution_time	[92.517ns; 92.585ns] or [-0.037%; +0.037%]	None	None	None
alloc_free/sampled_system_fast_path/64	execution_time	[26.625ns; 26.665ns] or [-0.073%; +0.073%]	None	None	None
alloc_free/sampled_system_fast_path/65536	execution_time	[101.055ns; 101.141ns] or [-0.042%; +0.042%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a41a0f4	1783685334	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	0.404ns	0.404ns	0.62%	2.205	16.984	0.09%	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	0.404ns	0.43%	0.102	10.451	0.09%	0.000ns	1	200
alloc_free/noop/4096	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.407ns	1.26%	4.838	53.524	0.12%	0.000ns	1	200
alloc_free/noop/64	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.407ns	1.31%	5.097	42.982	0.14%	0.000ns	1	200
alloc_free/noop/65536	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.403ns	0.407ns	1.18%	4.426	46.589	0.12%	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 [-0.013%; +0.013%]	None	None	None
alloc_free/noop/256	execution_time	[0.402ns; 0.402ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/noop/4096	execution_time	[0.402ns; 0.402ns] or [-0.017%; +0.017%]	None	None	None
alloc_free/noop/64	execution_time	[0.402ns; 0.402ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/noop/65536	execution_time	[0.402ns; 0.402ns] or [-0.017%; +0.017%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a41a0f4	1783685334	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	82.973ns	83.338ns ± 0.078ns	83.338ns ± 0.029ns	83.365ns	83.454ns	83.574ns	83.806ns	0.56%	0.809	8.791	0.09%	0.006ns	1	200
alloc_free/sampled_system_slow_path/256	execution_time	82.995ns	83.421ns ± 0.076ns	83.423ns ± 0.032ns	83.449ns	83.528ns	83.631ns	83.750ns	0.39%	-0.778	8.865	0.09%	0.005ns	1	200
alloc_free/sampled_system_slow_path/4096	execution_time	150.009ns	150.665ns ± 0.223ns	150.652ns ± 0.086ns	150.735ns	150.989ns	151.530ns	152.007ns	0.90%	2.050	10.673	0.15%	0.016ns	1	200
alloc_free/sampled_system_slow_path/64	execution_time	82.970ns	83.378ns ± 0.093ns	83.373ns ± 0.034ns	83.407ns	83.469ns	83.773ns	84.032ns	0.79%	2.710	19.043	0.11%	0.007ns	1	200
alloc_free/sampled_system_slow_path/65536	execution_time	154.714ns	155.479ns ± 0.314ns	155.447ns ± 0.066ns	155.511ns	155.669ns	156.143ns	158.765ns	2.13%	7.153	66.834	0.20%	0.022ns	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	[83.327ns; 83.348ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_system_slow_path/256	execution_time	[83.410ns; 83.432ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_system_slow_path/4096	execution_time	[150.634ns; 150.696ns] or [-0.021%; +0.021%]	None	None	None
alloc_free/sampled_system_slow_path/64	execution_time	[83.365ns; 83.391ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_system_slow_path/65536	execution_time	[155.436ns; 155.523ns] or [-0.028%; +0.028%]	None	None	None

Group 4

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a41a0f4	1783685334	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	60.392ns	60.982ns ± 0.085ns	60.977ns ± 0.019ns	60.998ns	61.056ns	61.193ns	61.739ns	1.25%	2.254	43.479	0.14%	0.006ns	1	200
sampler_only/slow_path/256	execution_time	60.328ns	60.495ns ± 0.048ns	60.493ns ± 0.021ns	60.512ns	60.583ns	60.635ns	60.692ns	0.33%	0.660	3.094	0.08%	0.003ns	1	200
sampler_only/slow_path/4096	execution_time	60.814ns	61.349ns ± 0.078ns	61.343ns ± 0.027ns	61.374ns	61.422ns	61.650ns	61.697ns	0.58%	-0.879	16.673	0.13%	0.005ns	1	200
sampler_only/slow_path/64	execution_time	60.768ns	60.978ns ± 0.059ns	60.975ns ± 0.023ns	61.000ns	61.054ns	61.195ns	61.361ns	0.63%	2.039	13.088	0.10%	0.004ns	1	200
sampler_only/slow_path/65536	execution_time	64.421ns	64.898ns ± 0.102ns	64.900ns ± 0.037ns	64.935ns	65.014ns	65.113ns	65.673ns	1.19%	1.695	19.248	0.16%	0.007ns	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	[60.970ns; 60.994ns] or [-0.019%; +0.019%]	None	None	None
sampler_only/slow_path/256	execution_time	[60.489ns; 60.502ns] or [-0.011%; +0.011%]	None	None	None
sampler_only/slow_path/4096	execution_time	[61.338ns; 61.360ns] or [-0.018%; +0.018%]	None	None	None
sampler_only/slow_path/64	execution_time	[60.970ns; 60.986ns] or [-0.013%; +0.013%]	None	None	None
sampler_only/slow_path/65536	execution_time	[64.884ns; 64.912ns] or [-0.022%; +0.022%]	None	None	None

Group 5

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a41a0f4	1783685334	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 ± 0.020ns	14.471ns ± 0.005ns	14.477ns	14.493ns	14.550ns	14.647ns	1.22%	3.857	32.033	0.14%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/256	execution_time	14.401ns	14.477ns ± 0.065ns	14.471ns ± 0.005ns	14.477ns	14.492ns	14.531ns	15.369ns	6.21%	13.213	179.757	0.45%	0.005ns	1	200
alloc_free/sampled_noop_fast_path/4096	execution_time	14.436ns	14.475ns ± 0.038ns	14.471ns ± 0.005ns	14.476ns	14.491ns	14.523ns	14.949ns	3.30%	10.584	126.032	0.26%	0.003ns	1	200
alloc_free/sampled_noop_fast_path/64	execution_time	14.401ns	14.472ns ± 0.013ns	14.471ns ± 0.005ns	14.477ns	14.491ns	14.509ns	14.525ns	0.37%	-0.750	10.598	0.09%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/65536	execution_time	14.401ns	14.471ns ± 0.013ns	14.471ns ± 0.005ns	14.475ns	14.485ns	14.525ns	14.530ns	0.41%	0.029	10.426	0.09%	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; 14.476ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_fast_path/256	execution_time	[14.468ns; 14.486ns] or [-0.062%; +0.062%]	None	None	None
alloc_free/sampled_noop_fast_path/4096	execution_time	[14.470ns; 14.480ns] or [-0.036%; +0.036%]	None	None	None
alloc_free/sampled_noop_fast_path/64	execution_time	[14.470ns; 14.474ns] or [-0.012%; +0.012%]	None	None	None
alloc_free/sampled_noop_fast_path/65536	execution_time	[14.469ns; 14.473ns] or [-0.013%; +0.013%]	None	None	None

Group 6

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a41a0f4	1783685334	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	61.594ns	62.019ns ± 0.078ns	62.017ns ± 0.028ns	62.044ns	62.097ns	62.271ns	62.512ns	0.80%	1.425	15.887	0.13%	0.006ns	1	200
alloc_free/sampled_noop_slow_path/256	execution_time	61.667ns	62.039ns ± 0.098ns	62.029ns ± 0.022ns	62.057ns	62.116ns	62.288ns	63.138ns	1.79%	7.047	79.078	0.16%	0.007ns	1	200
alloc_free/sampled_noop_slow_path/4096	execution_time	61.941ns	62.401ns ± 0.068ns	62.403ns ± 0.029ns	62.428ns	62.474ns	62.626ns	62.734ns	0.53%	-0.588	14.830	0.11%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/64	execution_time	61.446ns	61.733ns ± 0.112ns	61.728ns ± 0.026ns	61.753ns	61.807ns	61.895ns	63.082ns	2.19%	8.684	104.533	0.18%	0.008ns	1	200
alloc_free/sampled_noop_slow_path/65536	execution_time	65.894ns	66.499ns ± 0.115ns	66.496ns ± 0.032ns	66.535ns	66.638ns	66.806ns	67.237ns	1.11%	0.204	15.809	0.17%	0.008ns	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	[62.008ns; 62.030ns] or [-0.017%; +0.017%]	None	None	None
alloc_free/sampled_noop_slow_path/256	execution_time	[62.026ns; 62.053ns] or [-0.022%; +0.022%]	None	None	None
alloc_free/sampled_noop_slow_path/4096	execution_time	[62.392ns; 62.411ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_noop_slow_path/64	execution_time	[61.717ns; 61.748ns] or [-0.025%; +0.025%]	None	None	None
alloc_free/sampled_noop_slow_path/65536	execution_time	[66.483ns; 66.515ns] or [-0.024%; +0.024%]	None	None	None

Group 7

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a41a0f4	1783685334	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	14.066ns	14.273ns ± 0.073ns	14.268ns ± 0.033ns	14.303ns	14.378ns	14.476ns	14.692ns	2.97%	1.464	7.288	0.51%	0.005ns	1	200
alloc_free/system/256	execution_time	14.053ns	14.281ns ± 0.073ns	14.277ns ± 0.037ns	14.308ns	14.394ns	14.534ns	14.672ns	2.76%	1.285	6.688	0.51%	0.005ns	1	200
alloc_free/system/4096	execution_time	104.015ns	105.966ns ± 0.458ns	105.930ns ± 0.213ns	106.147ns	106.744ns	107.338ns	108.171ns	2.12%	0.868	5.407	0.43%	0.032ns	1	200
alloc_free/system/64	execution_time	14.003ns	14.276ns ± 0.064ns	14.273ns ± 0.034ns	14.307ns	14.405ns	14.472ns	14.489ns	1.51%	0.338	2.344	0.45%	0.005ns	1	200
alloc_free/system/65536	execution_time	87.021ns	88.314ns ± 0.246ns	88.328ns ± 0.112ns	88.432ns	88.645ns	88.842ns	89.468ns	1.29%	-0.513	6.557	0.28%	0.017ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/system/16	execution_time	[14.263ns; 14.284ns] or [-0.071%; +0.071%]	None	None	None
alloc_free/system/256	execution_time	[14.270ns; 14.291ns] or [-0.071%; +0.071%]	None	None	None
alloc_free/system/4096	execution_time	[105.903ns; 106.030ns] or [-0.060%; +0.060%]	None	None	None
alloc_free/system/64	execution_time	[14.268ns; 14.285ns] or [-0.062%; +0.062%]	None	None	None
alloc_free/system/65536	execution_time	[88.280ns; 88.348ns] or [-0.039%; +0.039%]	None	None	None

Group 8

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	a41a0f4	1783685334	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	13.669ns ± 0.014ns	13.668ns ± 0.005ns	13.674ns	13.683ns	13.705ns	13.795ns	0.93%	2.636	31.498	0.11%	0.001ns	1	200
sampler_only/fast_path/256	execution_time	13.601ns	13.667ns ± 0.014ns	13.666ns ± 0.004ns	13.670ns	13.684ns	13.701ns	13.788ns	0.89%	2.640	32.855	0.10%	0.001ns	1	200
sampler_only/fast_path/4096	execution_time	13.601ns	13.667ns ± 0.015ns	13.666ns ± 0.004ns	13.670ns	13.683ns	13.713ns	13.761ns	0.70%	1.597	15.268	0.11%	0.001ns	1	200
sampler_only/fast_path/64	execution_time	13.602ns	13.669ns ± 0.013ns	13.668ns ± 0.005ns	13.673ns	13.684ns	13.707ns	13.747ns	0.57%	0.374	13.933	0.09%	0.001ns	1	200
sampler_only/fast_path/65536	execution_time	13.603ns	13.668ns ± 0.014ns	13.667ns ± 0.005ns	13.673ns	13.683ns	13.713ns	13.751ns	0.61%	1.519	12.591	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 [-0.015%; +0.015%]	None	None	None
sampler_only/fast_path/256	execution_time	[13.665ns; 13.669ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/fast_path/4096	execution_time	[13.665ns; 13.669ns] or [-0.015%; +0.015%]	None	None	None
sampler_only/fast_path/64	execution_time	[13.667ns; 13.670ns] or [-0.013%; +0.013%]	None	None	None
sampler_only/fast_path/65536	execution_time	[13.666ns; 13.670ns] or [-0.014%; +0.014%]	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	184.54 MB	0% (0 B) 👌
/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