feat(shared-runtime): add block_on_with_timeout to BlockingRuntime by brettlangdon · Pull Request #2333 · DataDog/libdatadog

brettlangdon · 2026-08-07T13:00:43Z

What does this PR do?

Lets consumers bound a block_on wait with a deadline without adding tokio as a direct dependency — the executor is whatever the runtime already runs on.

Returns BlockOnTimeoutError::TimedOut/Io to distinguish a timeout from an executor failure.

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.

pr-commenter · 2026-08-07T13:13:40Z

Benchmarks

Comparison

Benchmark execution time: 2026-08-12 18:32:02

Comparing candidate commit 376b5d2 in PR branch brettlangdon/block_on_timeout with baseline commit 3da894a in branch main.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 23 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:trace_buffer/4_senders/no_delay

🟩 execution_time [-145.941µs; -114.203µs] or [-6.018%; -4.709%]
🟩 throughput [+74972.314op/s; +96338.006op/s] or [+5.047%; +6.485%]

Benchmark execution time: 2026-08-12 18:29:44

Comparing candidate commit 376b5d2 in PR branch brettlangdon/block_on_timeout with baseline commit 3da894a in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 3 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 ----------------------------------'

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	`376b5d2`	1786558634	brettlangdon/block_on_timeout

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
concentrator/add_spans_to_concentrator	execution_time	9.485ms	9.518ms ± 0.016ms	9.516ms ± 0.012ms	9.529ms	9.542ms	9.558ms	9.568ms	0.55%	0.380	-0.158	0.17%	0.001ms	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
concentrator/add_spans_to_concentrator	execution_time	[9.515ms; 9.520ms] or [-0.023%; +0.023%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`376b5d2`	1786558634	brettlangdon/block_on_timeout

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
trace_buffer/1_senders/10us_delay	execution_time	56.346ms	56.618ms ± 0.144ms	56.600ms ± 0.078ms	56.685ms	56.871ms	57.026ms	57.224ms	1.10%	1.018	1.827	0.25%	0.010ms	1	200
trace_buffer/1_senders/10us_delay	throughput	15727.748op/s	15896.234op/s ± 40.346op/s	15901.139op/s ± 22.052op/s	15920.154op/s	15953.182op/s	15961.814op/s	15972.733op/s	0.45%	-0.996	1.756	0.25%	2.853op/s	1	200
trace_buffer/1_senders/1us_delay	execution_time	49.974ms	50.079ms ± 0.034ms	50.081ms ± 0.012ms	50.089ms	50.143ms	50.197ms	50.207ms	0.25%	0.911	2.783	0.07%	0.002ms	1	200
trace_buffer/1_senders/1us_delay	throughput	17925.682op/s	17971.515op/s ± 12.075op/s	17970.943op/s ± 4.415op/s	17977.122op/s	17988.751op/s	17995.240op/s	18009.335op/s	0.21%	-0.903	2.768	0.07%	0.854op/s	1	200
trace_buffer/1_senders/no_delay	execution_time	327.903µs	337.809µs ± 3.657µs	337.607µs ± 2.554µs	340.117µs	344.079µs	349.102µs	350.361µs	3.78%	0.640	1.076	1.08%	0.259µs	1	200
trace_buffer/1_senders/no_delay	throughput	2568775.779op/s	2664540.062op/s ± 28662.975op/s	2665824.549op/s ± 20168.677op/s	2686109.073op/s	2704721.986op/s	2717980.500op/s	2744716.121op/s	2.96%	-0.555	0.905	1.07%	2026.778op/s	1	200
trace_buffer/2_senders/10us_delay	execution_time	56.758ms	57.271ms ± 0.191ms	57.285ms ± 0.139ms	57.402ms	57.606ms	57.670ms	57.695ms	0.72%	0.052	-0.579	0.33%	0.013ms	1	200
trace_buffer/2_senders/10us_delay	throughput	31198.498op/s	31429.620op/s ± 104.683op/s	31421.849op/s ± 76.195op/s	31512.960op/s	31598.047op/s	31642.639op/s	31713.640op/s	0.93%	-0.038	-0.577	0.33%	7.402op/s	1	200
trace_buffer/2_senders/1us_delay	execution_time	50.046ms	50.113ms ± 0.033ms	50.108ms ± 0.016ms	50.125ms	50.185ms	50.217ms	50.229ms	0.24%	1.257	1.907	0.07%	0.002ms	1	200
trace_buffer/2_senders/1us_delay	throughput	35835.831op/s	35918.840op/s ± 23.560op/s	35922.685op/s ± 11.820op/s	35934.295op/s	35949.111op/s	35955.286op/s	35967.053op/s	0.12%	-1.253	1.895	0.07%	1.666op/s	1	200
trace_buffer/2_senders/no_delay	execution_time	822.396µs	875.956µs ± 16.842µs	874.781µs ± 10.879µs	887.396µs	904.315µs	913.437µs	916.559µs	4.78%	-0.065	0.215	1.92%	1.191µs	1	200
trace_buffer/2_senders/no_delay	throughput	1963867.254op/s	2055654.335op/s ± 39622.367op/s	2057658.097op/s ± 25911.214op/s	2080942.629op/s	2119735.079op/s	2152102.005op/s	2188725.618op/s	6.37%	0.195	0.343	1.92%	2801.724op/s	1	200
trace_buffer/4_senders/10us_delay	execution_time	57.090ms	57.463ms ± 0.176ms	57.439ms ± 0.104ms	57.555ms	57.758ms	58.006ms	58.493ms	1.84%	1.472	5.519	0.31%	0.012ms	1	200
trace_buffer/4_senders/10us_delay	throughput	61545.329op/s	62649.686op/s ± 190.751op/s	62674.836op/s ± 114.154op/s	62773.183op/s	62899.971op/s	62971.685op/s	63057.844op/s	0.61%	-1.424	5.220	0.30%	13.488op/s	1	200
trace_buffer/4_senders/1us_delay	execution_time	50.069ms	50.169ms ± 0.036ms	50.162ms ± 0.014ms	50.180ms	50.245ms	50.276ms	50.317ms	0.31%	1.289	2.694	0.07%	0.003ms	1	200
trace_buffer/4_senders/1us_delay	throughput	71546.292op/s	71757.568op/s ± 51.718op/s	71767.447op/s ± 20.707op/s	71784.598op/s	71826.436op/s	71845.780op/s	71900.551op/s	0.19%	-1.282	2.676	0.07%	3.657op/s	1	200
trace_buffer/4_senders/no_delay	execution_time	2.038ms	2.295ms ± 0.093ms	2.310ms ± 0.060ms	2.363ms	2.441ms	2.485ms	2.525ms	9.32%	-0.393	-0.006	4.06%	0.007ms	1	200
trace_buffer/4_senders/no_delay	throughput	1425693.098op/s	1571212.461op/s ± 65275.404op/s	1558611.982op/s ± 39553.444op/s	1607835.805op/s	1694922.692op/s	1745198.383op/s	1766603.141op/s	13.34%	0.619	0.236	4.14%	4615.668op/s	1	200
trace_buffer/8_senders/10us_delay	execution_time	57.593ms	57.900ms ± 0.206ms	57.840ms ± 0.103ms	58.000ms	58.307ms	58.463ms	58.663ms	1.42%	1.175	0.894	0.36%	0.015ms	1	200
trace_buffer/8_senders/10us_delay	throughput	122734.896op/s	124354.770op/s ± 441.626op/s	124480.548op/s ± 221.658op/s	124677.770op/s	124836.103op/s	124960.533op/s	125015.232op/s	0.43%	-1.159	0.845	0.35%	31.228op/s	1	200
trace_buffer/8_senders/1us_delay	execution_time	50.203ms	50.286ms ± 0.058ms	50.269ms ± 0.024ms	50.307ms	50.393ms	50.499ms	50.581ms	0.62%	1.974	5.195	0.11%	0.004ms	1	200
trace_buffer/8_senders/1us_delay	throughput	142344.761op/s	143181.520op/s ± 163.526op/s	143230.040op/s ± 68.759op/s	143280.354op/s	143347.364op/s	143396.666op/s	143417.221op/s	0.13%	-1.963	5.131	0.11%	11.563op/s	1	200
trace_buffer/8_senders/no_delay	execution_time	5.396ms	6.367ms ± 0.190ms	6.410ms ± 0.088ms	6.493ms	6.556ms	6.605ms	6.641ms	3.59%	-1.938	5.048	2.98%	0.013ms	1	200
trace_buffer/8_senders/no_delay	throughput	1084245.853op/s	1131904.230op/s ± 36014.587op/s	1123186.259op/s ± 15172.854op/s	1141172.669op/s	1205383.711op/s	1273902.191op/s	1334354.444op/s	18.80%	2.270	7.094	3.17%	2546.616op/s	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
trace_buffer/1_senders/10us_delay	execution_time	[56.598ms; 56.638ms] or [-0.035%; +0.035%]	None	None	None
trace_buffer/1_senders/10us_delay	throughput	[15890.643op/s; 15901.826op/s] or [-0.035%; +0.035%]	None	None	None
trace_buffer/1_senders/1us_delay	execution_time	[50.075ms; 50.084ms] or [-0.009%; +0.009%]	None	None	None
trace_buffer/1_senders/1us_delay	throughput	[17969.842op/s; 17973.189op/s] or [-0.009%; +0.009%]	None	None	None
trace_buffer/1_senders/no_delay	execution_time	[337.302µs; 338.315µs] or [-0.150%; +0.150%]	None	None	None
trace_buffer/1_senders/no_delay	throughput	[2660567.649op/s; 2668512.474op/s] or [-0.149%; +0.149%]	None	None	None
trace_buffer/2_senders/10us_delay	execution_time	[57.245ms; 57.298ms] or [-0.046%; +0.046%]	None	None	None
trace_buffer/2_senders/10us_delay	throughput	[31415.112op/s; 31444.128op/s] or [-0.046%; +0.046%]	None	None	None
trace_buffer/2_senders/1us_delay	execution_time	[50.108ms; 50.118ms] or [-0.009%; +0.009%]	None	None	None
trace_buffer/2_senders/1us_delay	throughput	[35915.575op/s; 35922.105op/s] or [-0.009%; +0.009%]	None	None	None
trace_buffer/2_senders/no_delay	execution_time	[873.622µs; 878.291µs] or [-0.266%; +0.266%]	None	None	None
trace_buffer/2_senders/no_delay	throughput	[2050163.056op/s; 2061145.614op/s] or [-0.267%; +0.267%]	None	None	None
trace_buffer/4_senders/10us_delay	execution_time	[57.439ms; 57.487ms] or [-0.042%; +0.042%]	None	None	None
trace_buffer/4_senders/10us_delay	throughput	[62623.249op/s; 62676.122op/s] or [-0.042%; +0.042%]	None	None	None
trace_buffer/4_senders/1us_delay	execution_time	[50.164ms; 50.174ms] or [-0.010%; +0.010%]	None	None	None
trace_buffer/4_senders/1us_delay	throughput	[71750.400op/s; 71764.736op/s] or [-0.010%; +0.010%]	None	None	None
trace_buffer/4_senders/no_delay	execution_time	[2.282ms; 2.308ms] or [-0.564%; +0.564%]	None	None	None
trace_buffer/4_senders/no_delay	throughput	[1562165.918op/s; 1580259.004op/s] or [-0.576%; +0.576%]	None	None	None
trace_buffer/8_senders/10us_delay	execution_time	[57.871ms; 57.928ms] or [-0.049%; +0.049%]	None	None	None
trace_buffer/8_senders/10us_delay	throughput	[124293.565op/s; 124415.975op/s] or [-0.049%; +0.049%]	None	None	None
trace_buffer/8_senders/1us_delay	execution_time	[50.278ms; 50.294ms] or [-0.016%; +0.016%]	None	None	None
trace_buffer/8_senders/1us_delay	throughput	[143158.857op/s; 143204.183op/s] or [-0.016%; +0.016%]	None	None	None
trace_buffer/8_senders/no_delay	execution_time	[6.341ms; 6.393ms] or [-0.413%; +0.413%]	None	None	None
trace_buffer/8_senders/no_delay	throughput	[1126912.955op/s; 1136895.506op/s] or [-0.441%; +0.441%]	None	None	None

Group 1

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`376b5d2`	1786558634	brettlangdon/block_on_timeout

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
receiver_entry_point/report/2644	execution_time	4.030ms	4.076ms ± 0.019ms	4.071ms ± 0.010ms	4.084ms	4.114ms	4.128ms	4.154ms	2.04%	1.061	1.755	0.46%	0.001ms	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
receiver_entry_point/report/2644	execution_time	[4.073ms; 4.078ms] or [-0.064%; +0.064%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`376b5d2`	1786558634	brettlangdon/block_on_timeout

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
two way interface	execution_time	14.935µs	15.355µs ± 0.186µs	15.328µs ± 0.109µs	15.443µs	15.733µs	15.872µs	16.294µs	6.30%	1.223	3.004	1.21%	0.013µs	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
two way interface	execution_time	[15.329µs; 15.380µs] or [-0.168%; +0.168%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`376b5d2`	1786558634	brettlangdon/block_on_timeout

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
write only interface	execution_time	1.061µs	1.080µs ± 0.008µs	1.080µs ± 0.006µs	1.088µs	1.091µs	1.097µs	1.098µs	1.71%	-0.040	-0.834	0.72%	0.001µs	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
write only interface	execution_time	[1.079µs; 1.081µs] or [-0.100%; +0.100%]	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	`3da894a`	1786558862	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
concentrator/add_spans_to_concentrator	execution_time	9.485ms	9.520ms ± 0.019ms	9.519ms ± 0.012ms	9.531ms	9.552ms	9.574ms	9.586ms	0.71%	0.713	0.536	0.20%	0.001ms	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
concentrator/add_spans_to_concentrator	execution_time	[9.517ms; 9.523ms] or [-0.027%; +0.027%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`3da894a`	1786558862	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
trace_buffer/1_senders/10us_delay	execution_time	56.345ms	56.618ms ± 0.198ms	56.583ms ± 0.087ms	56.671ms	56.888ms	57.538ms	57.541ms	1.69%	2.599	8.977	0.35%	0.014ms	1	200
trace_buffer/1_senders/10us_delay	throughput	15641.031op/s	15896.268op/s ± 55.015op/s	15905.868op/s ± 24.353op/s	15929.734op/s	15952.937op/s	15971.741op/s	15972.914op/s	0.42%	-2.556	8.725	0.35%	3.890op/s	1	200
trace_buffer/1_senders/1us_delay	execution_time	49.968ms	50.082ms ± 0.028ms	50.081ms ± 0.010ms	50.091ms	50.140ms	50.154ms	50.160ms	0.16%	0.250	1.779	0.05%	0.002ms	1	200
trace_buffer/1_senders/1us_delay	throughput	17942.535op/s	17970.358op/s ± 9.872op/s	17970.765op/s ± 3.561op/s	17974.385op/s	17986.527op/s	17988.857op/s	18011.378op/s	0.23%	-0.244	1.786	0.05%	0.698op/s	1	200
trace_buffer/1_senders/no_delay	execution_time	329.340µs	336.774µs ± 5.086µs	336.253µs ± 1.521µs	337.907µs	341.544µs	346.756µs	397.315µs	18.16%	8.564	98.804	1.51%	0.360µs	1	200
trace_buffer/1_senders/no_delay	throughput	2265206.944op/s	2672957.380op/s ± 36043.028op/s	2676556.660op/s ± 12109.409op/s	2688266.801op/s	2708581.948op/s	2717345.852op/s	2732734.800op/s	2.10%	-7.379	80.313	1.35%	2548.627op/s	1	200
trace_buffer/2_senders/10us_delay	execution_time	56.762ms	57.200ms ± 0.205ms	57.186ms ± 0.142ms	57.341ms	57.519ms	57.634ms	58.102ms	1.60%	0.448	0.901	0.36%	0.015ms	1	200
trace_buffer/2_senders/10us_delay	throughput	30980.181op/s	31468.780op/s ± 112.684op/s	31476.135op/s ± 77.932op/s	31550.808op/s	31640.528op/s	31682.367op/s	31711.553op/s	0.75%	-0.419	0.812	0.36%	7.968op/s	1	200
trace_buffer/2_senders/1us_delay	execution_time	50.058ms	50.122ms ± 0.052ms	50.111ms ± 0.019ms	50.132ms	50.199ms	50.233ms	50.635ms	1.04%	5.147	44.996	0.10%	0.004ms	1	200
trace_buffer/2_senders/1us_delay	throughput	35548.569op/s	35912.525op/s ± 37.260op/s	35920.032op/s ± 13.282op/s	35932.741op/s	35946.110op/s	35951.331op/s	35958.607op/s	0.11%	-5.084	44.127	0.10%	2.635op/s	1	200
trace_buffer/2_senders/no_delay	execution_time	838.540µs	875.550µs ± 18.771µs	873.423µs ± 11.742µs	885.237µs	908.003µs	937.967µs	971.493µs	11.23%	1.243	3.512	2.14%	1.327µs	1	200
trace_buffer/2_senders/no_delay	throughput	1852818.090op/s	2056768.200op/s ± 43060.620op/s	2060857.324op/s ± 27338.572op/s	2086161.489op/s	2117830.157op/s	2141960.436op/s	2146588.791op/s	4.16%	-1.008	2.486	2.09%	3044.846op/s	1	200
trace_buffer/4_senders/10us_delay	execution_time	57.215ms	57.489ms ± 0.107ms	57.488ms ± 0.072ms	57.564ms	57.656ms	57.736ms	57.767ms	0.48%	0.006	-0.211	0.19%	0.008ms	1	200
trace_buffer/4_senders/10us_delay	throughput	62319.569op/s	62620.577op/s ± 116.773op/s	62621.362op/s ± 78.252op/s	62695.256op/s	62826.755op/s	62902.305op/s	62920.184op/s	0.48%	0.004	-0.209	0.19%	8.257op/s	1	200
trace_buffer/4_senders/1us_delay	execution_time	50.100ms	50.172ms ± 0.037ms	50.164ms ± 0.017ms	50.182ms	50.253ms	50.274ms	50.312ms	0.29%	1.199	1.303	0.07%	0.003ms	1	200
trace_buffer/4_senders/1us_delay	throughput	71554.078op/s	71752.851op/s ± 52.191op/s	71764.765op/s ± 24.228op/s	71786.111op/s	71813.428op/s	71836.484op/s	71856.091op/s	0.13%	-1.195	1.292	0.07%	3.690op/s	1	200
trace_buffer/4_senders/no_delay	execution_time	2.267ms	2.425ms ± 0.066ms	2.431ms ± 0.047ms	2.475ms	2.525ms	2.552ms	2.561ms	5.34%	-0.314	-0.490	2.72%	0.005ms	1	200
trace_buffer/4_senders/no_delay	throughput	1405933.351op/s	1485557.301op/s ± 40997.331op/s	1481017.214op/s ± 28397.770op/s	1512503.592op/s	1558799.562op/s	1583917.439op/s	1587689.909op/s	7.20%	0.430	-0.397	2.75%	2898.949op/s	1	200
trace_buffer/8_senders/10us_delay	execution_time	57.549ms	57.828ms ± 0.172ms	57.774ms ± 0.084ms	57.926ms	58.178ms	58.295ms	58.403ms	1.09%	1.138	0.808	0.30%	0.012ms	1	200
trace_buffer/8_senders/10us_delay	throughput	123280.646op/s	124507.595op/s ± 368.120op/s	124623.588op/s ± 181.401op/s	124779.059op/s	124917.599op/s	125036.605op/s	125110.290op/s	0.39%	-1.125	0.770	0.29%	26.030op/s	1	200
trace_buffer/8_senders/1us_delay	execution_time	50.201ms	50.292ms ± 0.063ms	50.271ms ± 0.027ms	50.322ms	50.415ms	50.492ms	50.538ms	0.53%	1.560	2.498	0.12%	0.004ms	1	200
trace_buffer/8_senders/1us_delay	throughput	142465.730op/s	143163.122op/s ± 179.047op/s	143222.330op/s ± 76.669op/s	143278.575op/s	143349.852op/s	143414.882op/s	143423.058op/s	0.14%	-1.552	2.466	0.12%	12.661op/s	1	200
trace_buffer/8_senders/no_delay	execution_time	5.798ms	6.367ms ± 0.172ms	6.387ms ± 0.113ms	6.506ms	6.580ms	6.623ms	6.671ms	4.45%	-0.997	0.909	2.69%	0.012ms	1	200
trace_buffer/8_senders/no_delay	throughput	1079264.535op/s	1131592.606op/s ± 31469.776op/s	1127339.918op/s ± 19869.889op/s	1146958.165op/s	1198842.230op/s	1228911.333op/s	1241783.818op/s	10.15%	1.159	1.377	2.77%	2225.249op/s	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
trace_buffer/1_senders/10us_delay	execution_time	[56.590ms; 56.645ms] or [-0.048%; +0.048%]	None	None	None
trace_buffer/1_senders/10us_delay	throughput	[15888.644op/s; 15903.893op/s] or [-0.048%; +0.048%]	None	None	None
trace_buffer/1_senders/1us_delay	execution_time	[50.079ms; 50.086ms] or [-0.008%; +0.008%]	None	None	None
trace_buffer/1_senders/1us_delay	throughput	[17968.990op/s; 17971.726op/s] or [-0.008%; +0.008%]	None	None	None
trace_buffer/1_senders/no_delay	execution_time	[336.069µs; 337.479µs] or [-0.209%; +0.209%]	None	None	None
trace_buffer/1_senders/no_delay	throughput	[2667962.163op/s; 2677952.597op/s] or [-0.187%; +0.187%]	None	None	None
trace_buffer/2_senders/10us_delay	execution_time	[57.172ms; 57.229ms] or [-0.050%; +0.050%]	None	None	None
trace_buffer/2_senders/10us_delay	throughput	[31453.163op/s; 31484.397op/s] or [-0.050%; +0.050%]	None	None	None
trace_buffer/2_senders/1us_delay	execution_time	[50.115ms; 50.129ms] or [-0.014%; +0.014%]	None	None	None
trace_buffer/2_senders/1us_delay	throughput	[35907.361op/s; 35917.689op/s] or [-0.014%; +0.014%]	None	None	None
trace_buffer/2_senders/no_delay	execution_time	[872.949µs; 878.152µs] or [-0.297%; +0.297%]	None	None	None
trace_buffer/2_senders/no_delay	throughput	[2050800.412op/s; 2062735.987op/s] or [-0.290%; +0.290%]	None	None	None
trace_buffer/4_senders/10us_delay	execution_time	[57.474ms; 57.504ms] or [-0.026%; +0.026%]	None	None	None
trace_buffer/4_senders/10us_delay	throughput	[62604.393op/s; 62636.760op/s] or [-0.026%; +0.026%]	None	None	None
trace_buffer/4_senders/1us_delay	execution_time	[50.167ms; 50.177ms] or [-0.010%; +0.010%]	None	None	None
trace_buffer/4_senders/1us_delay	throughput	[71745.618op/s; 71760.084op/s] or [-0.010%; +0.010%]	None	None	None
trace_buffer/4_senders/no_delay	execution_time	[2.416ms; 2.434ms] or [-0.379%; +0.379%]	None	None	None
trace_buffer/4_senders/no_delay	throughput	[1479875.465op/s; 1491239.137op/s] or [-0.382%; +0.382%]	None	None	None
trace_buffer/8_senders/10us_delay	execution_time	[57.805ms; 57.852ms] or [-0.041%; +0.041%]	None	None	None
trace_buffer/8_senders/10us_delay	throughput	[124456.577op/s; 124558.613op/s] or [-0.041%; +0.041%]	None	None	None
trace_buffer/8_senders/1us_delay	execution_time	[50.284ms; 50.301ms] or [-0.017%; +0.017%]	None	None	None
trace_buffer/8_senders/1us_delay	throughput	[143138.308op/s; 143187.936op/s] or [-0.017%; +0.017%]	None	None	None
trace_buffer/8_senders/no_delay	execution_time	[6.344ms; 6.391ms] or [-0.374%; +0.374%]	None	None	None
trace_buffer/8_senders/no_delay	throughput	[1127231.198op/s; 1135954.015op/s] or [-0.385%; +0.385%]	None	None	None

Group 1

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`3da894a`	1786558862	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
receiver_entry_point/report/2644	execution_time	4.050ms	4.094ms ± 0.031ms	4.083ms ± 0.012ms	4.101ms	4.159ms	4.177ms	4.193ms	2.70%	1.289	0.777	0.76%	0.002ms	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
receiver_entry_point/report/2644	execution_time	[4.090ms; 4.098ms] or [-0.105%; +0.105%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`3da894a`	1786558862	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
two way interface	execution_time	15.312µs	15.608µs ± 0.193µs	15.554µs ± 0.088µs	15.676µs	15.930µs	16.202µs	16.700µs	7.37%	1.855	5.774	1.23%	0.014µs	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
two way interface	execution_time	[15.581µs; 15.634µs] or [-0.171%; +0.171%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`3da894a`	1786558862	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
write only interface	execution_time	1.084µs	1.097µs ± 0.005µs	1.097µs ± 0.003µs	1.099µs	1.104µs	1.106µs	1.129µs	2.91%	0.961	6.520	0.47%	0.000µs	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
write only interface	execution_time	[1.096µs; 1.098µs] or [-0.065%; +0.065%]	None	None	None

datadog-official · 2026-08-07T13:14:27Z

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 87.84%
• Overall Coverage: 76.00% (-0.00%)

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: 376b5d2 | Docs | Datadog PR Page | Give us feedback!}

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dd-octo-sts · 2026-08-07T13:42:29Z

Artifact Size Benchmark Report

aarch64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.a	89.32 MB	89.32 MB	+0% (+24 B) 👌
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.so	8.20 MB	8.20 MB	0% (0 B) 👌

aarch64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.so	11.06 MB	11.06 MB	0% (0 B) 👌
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.a	100.50 MB	100.50 MB	+0% (+8 B) 👌

libdatadog-x64-windows

Artifact	Baseline	Commit	Change
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.dll	26.65 MB	26.65 MB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.lib	94.56 KB	94.56 KB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.pdb	191.58 MB	191.60 MB	+0% (+16.00 KB) 👌
/libdatadog-x64-windows/debug/static/datadog_profiling_ffi.lib	1001.92 MB	1001.96 MB	+0% (+48.40 KB) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.dll	8.72 MB	8.72 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.lib	94.56 KB	94.56 KB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.pdb	25.64 MB	25.64 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/static/datadog_profiling_ffi.lib	51.06 MB	51.06 MB	0% (0 B) 👌

libdatadog-x86-windows

Artifact	Baseline	Commit	Change
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.dll	23.22 MB	23.22 MB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.lib	96.04 KB	96.04 KB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.pdb	196.41 MB	196.41 MB	+0% (+8.00 KB) 👌
/libdatadog-x86-windows/debug/static/datadog_profiling_ffi.lib	991.00 MB	991.04 MB	+0% (+46.83 KB) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.dll	6.74 MB	6.74 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.lib	96.04 KB	96.04 KB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.pdb	27.58 MB	27.58 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/static/datadog_profiling_ffi.lib	48.61 MB	48.61 MB	+0% (+2 B) 👌

x86_64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.a	79.57 MB	79.57 MB	+0% (+16 B) 👌
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.so	9.13 MB	9.13 MB	0% (0 B) 👌

x86_64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.a	95.22 MB	95.22 MB	0% (0 B) 👌
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.so	11.15 MB	11.15 MB	0% (0 B) 👌

Lets consumers bound a block_on wait with a deadline without adding tokio as a direct dependency — the executor is whatever the runtime already runs on. Returns BlockOnTimeoutError::TimedOut/Io to distinguish a timeout from an executor failure.

yannham · 2026-08-10T16:35:49Z

+        // catch_unwind. Catching the panic here converts it to an error, so a misconfigured
+        // executor cannot abort a process that calls block_on_with_timeout across the FFI
+        // boundary.
+        let result = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {


I'm wondering if we need to go through this machinery. While it's true that it could panic in theory, there are a dozen usages of timeout in various part of libdatadog that just use timeout and expect it to be there and to not panic, so I think it's reasonable to assume that there's always a timer driver. Unless you do not have one in your setup?. Even if we were to protect against that, I suppose the panic catching should rather be handled at the FFI boundary. Any thought @VianneyRuhlmann ?

My main push back on this is that the shared runtime should be abstracting away the Tokio runtime wherever possible, if we allow a tokio specific panic to be raised up to called (Rust or C FFI or etc) then we are exposing the tokio specifics to the caller, and if we ever swap out the runtime then we'll break their call sites.

Hmm, it's a good point. In general I'm a bit wary of using catch_unwind as an exception catching mechanism; it was not really designed for that (or at least it did not became that), it is moot if panic=abort is set somewhere in the final build, and the string message matching is a bit fragile.

That being said, the perf impact is minimal in the happy path and unfortunately tokio doesn't expose an easy way to know if it was built with the timer capability, which is a bummer. So maybe it's the safest way to go for now yeah...

Well, at least I'm trying: tokio-rs/tokio#8361 🤷‍♂️ in the meantime let's not block this PR,

Co-authored-by: Yann Hamdaoui <yann.hamdaoui@gmail.com>

brettlangdon · 2026-08-13T12:12:41Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-08-13T12:12:46Z

View all feedbacks in Devflow UI.

2026-08-13 12:12:46 UTC ℹ️ Start processing command /merge

2026-08-13 12:12:51 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in main is approximately 1h (p90).

2026-08-13 12:50:38 UTC ℹ️ MergeQueue: This merge request was merged

) # Release proposal for libdd-data-pipeline, libdd-telemetry and their dependencies This PR contains version bumps based on public API changes and commits since last release. ## libdd-ddsketch **Next version:** `1.1.1` **Semver bump:** `patch` **Tag:** `libdd-ddsketch-v1.1.1` ### Commits - refactor: migrate to workspace dependencies, phase 4 (#2296) - chore: moving to workspace-level dependencies, phase 2 (#2270) ## libdd-shared-runtime **Next version:** `3.0.0` **Semver bump:** `major` **Tag:** `libdd-shared-runtime-v3.0.0` ### ⚠️ major bump forced due to: - `libdd-capabilities`: ^2.1.0 → ^3.0.0 - `libdd-capabilities-impl`: ^3.0.0 → ^4.0.0 ### Commits - feat(shared-runtime): add block_on_with_timeout to BlockingRuntime (#2333) - chore(runtime): restart all workers on invalid state (#2262) - refactor: migrate to workspace dependencies, phase 3 (#2283) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) ## libdd-dogstatsd-client **Next version:** `5.0.0` **Semver bump:** `major` **Tag:** `libdd-dogstatsd-client-v5.0.0` ### Commits - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat(dogstatsd)!: add shared_runtime buffered sink (#2224) - refactor(statsd)!: make client clonable (#2222) ## libdd-telemetry **Next version:** `7.0.0` **Semver bump:** `major` **Tag:** `libdd-telemetry-v7.0.0` ### Commits - refactor(rc)!: make conversion from RemoteConfigProduct back and forth generally available (#2325) - feat(telemetry)!: Add Installation signature and AppProduct changes payloads (#2213) - fix(telemetry)!: stop sending Connection: close to the Agent (#2286) - refactor: migrate to workspace dependencies, phase 3 (#2283) - chore: moving to workspace-level dependencies, phase 2 (#2270) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - fix: drain the mailbox before stopping (#2258) - feat(telemetry)!: make telemetry worker wasm-compatible for the TraceExporter (#2172) - fix(sidecar): don't double-encode file:// telemetry endpoints (#2230) ## libdd-trace-obfuscation **Next version:** `6.0.0` **Semver bump:** `major` **Tag:** `libdd-trace-obfuscation-v6.0.0` ### ⚠️ major bump forced due to: - `libdd-trace-utils`: ^9.0.0 → ^10.1.0 ### Commits - refactor: migrate to workspace dependencies, phase 4 (#2296) - chore(lint): update nightly (#2281) - chore: moving to workspace-level dependencies, phase 2 (#2270) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - fix: new clippy lints (#2219) ## libdd-trace-stats **Next version:** `7.0.0` **Semver bump:** `major` **Tag:** `libdd-trace-stats-v7.0.0` ### ⚠️ major bump forced due to: - `libdd-capabilities`: ^2.1.0 → ^3.0.0 - `libdd-capabilities-impl`: ^3.0.0 → ^4.0.0 - `libdd-dogstatsd-client`: ^4.0.0 → ^5.0.0 - `libdd-telemetry`: ^6.0.0 → ^7.0.0 - `libdd-trace-utils`: ^9.0.0 → ^10.1.0 ### Commits - feat: add v1 isolated bricks for trace exporter (#2280) - refactor: migrate to workspace dependencies, phase 4 (#2296) - feat(data-pipeline)!: add compression option for agentless export (#2205) - feat(stats)!: per-field cardinality limits (#2211) - refactor: migrate to workspace dependencies, phase 3 (#2283) - feat(stats)!: string field length limit (#2267) - feat(trace_exporter)!: add `restart_after_fork` configuration option [APMSP-3843] (#2263) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat(stats)!: implement additional metric tags in libdd-trace-stats (#2170) - refactor(statsd)!: make client clonable (#2222) - fix(stats-exporter): disable retries for stats payload sends (#2249) - feat(telemetry)!: make telemetry worker wasm-compatible for the TraceExporter (#2172) - fix!: css obfuscation logic (#2203) ## libdd-data-pipeline **Next version:** `8.0.0` **Semver bump:** `major` **Tag:** `libdd-data-pipeline-v8.0.0` ### ⚠️ major bump forced due to: - `libdd-capabilities`: ^2.1.0 → ^3.0.0 - `libdd-capabilities-impl`: ^3.0.0 → ^4.0.0 - `libdd-dogstatsd-client`: ^4.0.0 → ^5.0.0 - `libdd-telemetry`: ^6.0.0 → ^7.0.0 - `libdd-trace-stats`: ^6.0.0 → ^7.0.0 - `libdd-trace-utils`: ^9.0.0 → ^10.1.0 ### Commits - fix(trace-exporter): mark OTLP client-computed stats (#2245) - feat(data-pipeline): adds new attributes to OTLP trace metrics export (#2316) - feat: add v1 isolated bricks for trace exporter (#2280) - feat(data-pipeline)!: add flush_and_close to the trace buffer (#2313) - feat(telemetry)!: Add Installation signature and AppProduct changes payloads (#2213) - refactor: migrate to workspace dependencies, phase 4 (#2296) - feat(data-pipeline)!: add compression option for agentless export (#2205) - fix(telemetry)!: stop sending Connection: close to the Agent (#2286) - feat(stats)!: per-field cardinality limits (#2211) - refactor: migrate to workspace dependencies, phase 3 (#2283) - feat(stats)!: string field length limit (#2267) - refactor(trace-utils)!: split generic TracerHeaderTags (#2279) - chore: moving to workspace-level dependencies, phase 2 (#2270) - feat(trace_exporter)!: add `restart_after_fork` configuration option [APMSP-3843] (#2263) - feat(data-pipeline): emit additional_metric_tags on OTLP span duration metric (#2264) - refactor: consolidate core dependencies at workspace level (phase 1) (#2253) - feat(dogstatsd)!: add shared_runtime buffered sink (#2224) - feat(stats)!: implement additional metric tags in libdd-trace-stats (#2170) - refactor(statsd)!: make client clonable (#2222) - feat(telemetry)!: make telemetry worker wasm-compatible for the TraceExporter (#2172) - feat(trace_exporter)!: remove deprecated methods (#2250) - feat(trace-utils)!: add v1 decoder (#2174) - feat(trace-utils)!: add encoder v1 to v04 + refactor (#2145) - feat(otlp): add instrumentation scope metadata (#2235) - fix(trace-utils)!: serialize v0.5 span links and events into meta (#980) - fix!: css obfuscation logic (#2203) - test(data-pipeline): gate telemetry-only tests behind the telemetry feature (#2204) [APMSP-3843]: https://datadoghq.atlassian.net/browse/APMSP-3843?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: hoolioh <107922352+hoolioh@users.noreply.github.com>

brettlangdon marked this pull request as ready for review August 7, 2026 13:25

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Comment thread libdd-shared-runtime/src/shared_runtime/mod.rs Outdated

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brettlangdon force-pushed the brettlangdon/block_on_timeout branch from 067a252 to 0f4a0ae Compare August 7, 2026 15:58

Merge branch 'main' into brettlangdon/block_on_timeout

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yannham reviewed Aug 10, 2026

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brettlangdon and others added 3 commits August 12, 2026 13:25

Update libdd-shared-runtime/src/shared_runtime/mod.rs

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Co-authored-by: Yann Hamdaoui <yann.hamdaoui@gmail.com>

Merge branch 'main' into brettlangdon/block_on_timeout

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revert async move removal, since we need it for tests

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yannham approved these changes Aug 13, 2026

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gh-worker-dd-mergequeue-cf854d Bot merged commit a21b01f into main Aug 13, 2026
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dd-octo-sts Bot mentioned this pull request Aug 17, 2026

chore(release): proposal for libdd-data-pipeline, libdd-telemetry #2358

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