Optimize PropagationTags hash/compare and pre-cache decision maker values by dougqh · Pull Request #11119 · DataDog/dd-trace-java

dougqh · 2026-04-15T03:26:35Z

Summary

Inlines hashDD()/hashW3C() to eliminate CharConverter virtual dispatch per character in TagValue hash computation
Inlines compareDD()/compareW3C() with forType(DATADOG) pre-fetch to eliminate per-character charAt() branch and converter dispatch
Pre-caches decision maker TagValue instances for sampling mechanisms 0-13, eliminating "-" + samplingMechanism String concatenation on every sampling decision
Reorders clearCachedHeader() null check to short-circuit for fresh PTags, avoiding wasted volatile write on every trace root
Includes TagValueCacheBenchmark and PropagationTagsLifecycleBenchmark JMH benchmarks

Motivation: PropagationTags processing consumed ~5% of foreground CPU in a 16-thread span creation stress test — 2% from TagValue.hash per-character virtual dispatch, 1% from TagValue.compare, 1% from updateKnuthSamplingRate unnecessary header invalidation, and 1% from String allocation in decision maker construction.

Benchmark results

TagValueCacheBenchmark (zero GC allocation):

Benchmark	Short (ops/s)	Medium (ops/s)	Long (ops/s)
fromDD	75.5M	29.7M	12.7M
fromW3C	79.6M	35.0M	13.7M
fromDD (special chars)	42.3M	29.3M	12.4M
fromW3C (special chars)	48.4M	34.8M	13.6M

PropagationTagsLifecycleBenchmark:

Benchmark	ops/s	alloc (B/op)
createEmpty	127M	88
createAndSetSamplingPriority	80M	88
createSetPriorityAndKnuthRate	62M	88
repeatedSamplingDecision	56.3M	88
fullLifecycleDatadog	14.4M	192

Test plan

All *TagValue* tests pass
All *PropagationTags* tests pass (Datadog, W3C, DDSpanContext)
All *KnuthSampling* tests pass
All *CoreSpanBuilder* and *DDSpanContext* tests pass
Run full CI suite
Verify with span creation stress test profiling

🤖 Generated with Claude Code

…lues TagValue.hash and TagValue.compare consumed ~3% of foreground CPU via per-character CharConverter virtual dispatch. updateKnuthSamplingRate and decision maker string concatenation added another ~2%. Inline hashDD/hashW3C and compareDD/compareW3C to eliminate interface dispatch per character. Use forType(DATADOG) once before compare loops to avoid per-character charAt() branch. Pre-cache decision maker TagValues for mechanisms 0-13 to eliminate String concatenation and cache lookup on every sampling decision. Reorder clearCachedHeader() null check to short-circuit for fresh PTags. tag: no release note tag: ai generated Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

dougqh · 2026-04-15T03:30:00Z

+   * samplingMechanism String concatenation and TagValue.from() cache lookup on every sampling
+   * decision.
+   */
+  private static final int MAX_KNOWN_MECHANISM = SamplingMechanism.AI_GUARD; // 13


Currently, this would be easy for someone to forget to update.

I'd like to move this constant into SamplingMechanism.
I'd also like to add a test that checks via reflection that MAX_KNOWN_MECHANISM is equal to the highest value of any of the constant in SamplingMechanism (excluding MAX_KNOWN_MECHANISM).

Move the constant from PTagsFactory to SamplingMechanism so it stays in sync when new mechanisms are added. Add a reflective test that verifies MAX_KNOWN_MECHANISM equals the highest non-negative byte constant in the class (excluding itself). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

dougqh · 2026-04-15T16:36:23Z

    return start < 0 || end <= 0 || s.length() < end;
  }

+  /** Hash a DD-encoded input by converting each char to W3C (the canonical form). */


I'm not convinced these hash code specializations are worth the trouble. I'm curious what others think.

pr-commenter · 2026-04-15T17:15:00Z

Benchmarks

Startup

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	dougqh/optimize-propagation-tags
git_commit_date	1776270678	1776270148
git_commit_sha	93449b6f0f	`6d93d59`
release_version	1.62.0-SNAPSHOT~693449b6f0f	1.62.0-SNAPSHOT~6d93d59e66

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1776271972	1776271972
ci_job_id	1598473698	1598473698
ci_pipeline_id	107860904	107860904
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-0-anze9obk 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-0-anze9obk 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
module	Agent	Agent
parent	None	None

Summary

Found 1 performance improvements and 0 performance regressions! Performance is the same for 56 metrics, 14 unstable metrics.

scenario	Δ mean execution_time	candidate mean execution_time	baseline mean execution_time
scenario:startup:petclinic:appsec:Telemetry	better [-734.566µs; -209.436µs] or [-8.883%; -2.533%]	7.797ms	8.269ms

Startup time reports for insecure-bank

gantt
    title insecure-bank - global startup overhead: candidate=1.62.0-SNAPSHOT~6d93d59e66, baseline=1.62.0-SNAPSHOT~693449b6f0f

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.066 s) : 0, 1065925
Total [baseline] (8.884 s) : 0, 8884105
Agent [candidate] (1.065 s) : 0, 1065185
Total [candidate] (8.837 s) : 0, 8836550
section iast
Agent [baseline] (1.22 s) : 0, 1220278
Total [baseline] (9.568 s) : 0, 9568353
Agent [candidate] (1.228 s) : 0, 1227673
Total [candidate] (9.544 s) : 0, 9543732

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.066 s	-
Agent	iast	1.22 s	154.354 ms (14.5%)
Total	tracing	8.884 s	-
Total	iast	9.568 s	684.248 ms (7.7%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.065 s	-
Agent	iast	1.228 s	162.487 ms (15.3%)
Total	tracing	8.837 s	-
Total	iast	9.544 s	707.182 ms (8.0%)

gantt
    title insecure-bank - break down per module: candidate=1.62.0-SNAPSHOT~6d93d59e66, baseline=1.62.0-SNAPSHOT~693449b6f0f

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.248 ms) : 0, 1248
crashtracking [candidate] (1.24 ms) : 0, 1240
BytebuddyAgent [baseline] (636.866 ms) : 0, 636866
BytebuddyAgent [candidate] (640.349 ms) : 0, 640349
AgentMeter [baseline] (29.553 ms) : 0, 29553
AgentMeter [candidate] (29.585 ms) : 0, 29585
GlobalTracer [baseline] (251.053 ms) : 0, 251053
GlobalTracer [candidate] (249.621 ms) : 0, 249621
AppSec [baseline] (32.828 ms) : 0, 32828
AppSec [candidate] (32.111 ms) : 0, 32111
Debugger [baseline] (60.069 ms) : 0, 60069
Debugger [candidate] (59.065 ms) : 0, 59065
Remote Config [baseline] (609.864 µs) : 0, 610
Remote Config [candidate] (608.603 µs) : 0, 609
Telemetry [baseline] (8.21 ms) : 0, 8210
Telemetry [candidate] (8.845 ms) : 0, 8845
Flare Poller [baseline] (9.245 ms) : 0, 9245
Flare Poller [candidate] (7.464 ms) : 0, 7464
section iast
crashtracking [baseline] (1.228 ms) : 0, 1228
crashtracking [candidate] (1.239 ms) : 0, 1239
BytebuddyAgent [baseline] (798.248 ms) : 0, 798248
BytebuddyAgent [candidate] (803.356 ms) : 0, 803356
AgentMeter [baseline] (11.345 ms) : 0, 11345
AgentMeter [candidate] (11.582 ms) : 0, 11582
GlobalTracer [baseline] (238.538 ms) : 0, 238538
GlobalTracer [candidate] (240.938 ms) : 0, 240938
AppSec [baseline] (29.518 ms) : 0, 29518
AppSec [candidate] (31.585 ms) : 0, 31585
Debugger [baseline] (64.263 ms) : 0, 64263
Debugger [candidate] (63.38 ms) : 0, 63380
Remote Config [baseline] (529.529 µs) : 0, 530
Remote Config [candidate] (525.528 µs) : 0, 526
Telemetry [baseline] (11.176 ms) : 0, 11176
Telemetry [candidate] (9.724 ms) : 0, 9724
Flare Poller [baseline] (3.428 ms) : 0, 3428
Flare Poller [candidate] (3.497 ms) : 0, 3497
IAST [baseline] (25.621 ms) : 0, 25621
IAST [candidate] (25.658 ms) : 0, 25658

Startup time reports for petclinic

gantt
    title petclinic - global startup overhead: candidate=1.62.0-SNAPSHOT~6d93d59e66, baseline=1.62.0-SNAPSHOT~693449b6f0f

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.068 s) : 0, 1067798
Total [baseline] (11.119 s) : 0, 11119221
Agent [candidate] (1.061 s) : 0, 1061130
Total [candidate] (11.116 s) : 0, 11116117
section appsec
Agent [baseline] (1.25 s) : 0, 1250442
Total [baseline] (11.147 s) : 0, 11146896
Agent [candidate] (1.249 s) : 0, 1249421
Total [candidate] (11.09 s) : 0, 11090357
section iast
Agent [baseline] (1.227 s) : 0, 1226898
Total [baseline] (11.366 s) : 0, 11366201
Agent [candidate] (1.222 s) : 0, 1221842
Total [candidate] (11.263 s) : 0, 11263060
section profiling
Agent [baseline] (1.192 s) : 0, 1191854
Total [baseline] (11.008 s) : 0, 11007787
Agent [candidate] (1.187 s) : 0, 1186666
Total [candidate] (11.117 s) : 0, 11117162

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.068 s	-
Agent	appsec	1.25 s	182.644 ms (17.1%)
Agent	iast	1.227 s	159.1 ms (14.9%)
Agent	profiling	1.192 s	124.056 ms (11.6%)
Total	tracing	11.119 s	-
Total	appsec	11.147 s	27.675 ms (0.2%)
Total	iast	11.366 s	246.98 ms (2.2%)
Total	profiling	11.008 s	-111.434 ms (-1.0%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.061 s	-
Agent	appsec	1.249 s	188.292 ms (17.7%)
Agent	iast	1.222 s	160.712 ms (15.1%)
Agent	profiling	1.187 s	125.536 ms (11.8%)
Total	tracing	11.116 s	-
Total	appsec	11.09 s	-25.76 ms (-0.2%)
Total	iast	11.263 s	146.943 ms (1.3%)
Total	profiling	11.117 s	1.045 ms (0.0%)

gantt
    title petclinic - break down per module: candidate=1.62.0-SNAPSHOT~6d93d59e66, baseline=1.62.0-SNAPSHOT~693449b6f0f

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.249 ms) : 0, 1249
crashtracking [candidate] (1.241 ms) : 0, 1241
BytebuddyAgent [baseline] (640.199 ms) : 0, 640199
BytebuddyAgent [candidate] (634.286 ms) : 0, 634286
AgentMeter [baseline] (29.847 ms) : 0, 29847
AgentMeter [candidate] (29.682 ms) : 0, 29682
GlobalTracer [baseline] (251.226 ms) : 0, 251226
GlobalTracer [candidate] (250.469 ms) : 0, 250469
AppSec [baseline] (32.761 ms) : 0, 32761
AppSec [candidate] (32.23 ms) : 0, 32230
Debugger [baseline] (60.565 ms) : 0, 60565
Debugger [candidate] (60.122 ms) : 0, 60122
Remote Config [baseline] (597.342 µs) : 0, 597
Remote Config [candidate] (607.844 µs) : 0, 608
Telemetry [baseline] (8.21 ms) : 0, 8210
Telemetry [candidate] (8.114 ms) : 0, 8114
Flare Poller [baseline] (6.706 ms) : 0, 6706
Flare Poller [candidate] (8.265 ms) : 0, 8265
section appsec
crashtracking [baseline] (1.238 ms) : 0, 1238
crashtracking [candidate] (1.214 ms) : 0, 1214
BytebuddyAgent [baseline] (662.226 ms) : 0, 662226
BytebuddyAgent [candidate] (660.604 ms) : 0, 660604
AgentMeter [baseline] (12.146 ms) : 0, 12146
AgentMeter [candidate] (12.048 ms) : 0, 12048
GlobalTracer [baseline] (249.97 ms) : 0, 249970
GlobalTracer [candidate] (250.684 ms) : 0, 250684
IAST [baseline] (24.707 ms) : 0, 24707
IAST [candidate] (24.452 ms) : 0, 24452
AppSec [baseline] (185.293 ms) : 0, 185293
AppSec [candidate] (185.46 ms) : 0, 185460
Debugger [baseline] (66.021 ms) : 0, 66021
Debugger [candidate] (66.593 ms) : 0, 66593
Remote Config [baseline] (620.711 µs) : 0, 621
Remote Config [candidate] (587.029 µs) : 0, 587
Telemetry [baseline] (8.269 ms) : 0, 8269
Telemetry [candidate] (7.797 ms) : 0, 7797
Flare Poller [baseline] (3.452 ms) : 0, 3452
Flare Poller [candidate] (3.534 ms) : 0, 3534
section iast
crashtracking [baseline] (1.228 ms) : 0, 1228
crashtracking [candidate] (1.215 ms) : 0, 1215
BytebuddyAgent [baseline] (802.251 ms) : 0, 802251
BytebuddyAgent [candidate] (798.932 ms) : 0, 798932
AgentMeter [baseline] (11.418 ms) : 0, 11418
AgentMeter [candidate] (11.363 ms) : 0, 11363
GlobalTracer [baseline] (240.442 ms) : 0, 240442
GlobalTracer [candidate] (238.845 ms) : 0, 238845
IAST [baseline] (25.887 ms) : 0, 25887
IAST [candidate] (25.395 ms) : 0, 25395
AppSec [baseline] (31.225 ms) : 0, 31225
AppSec [candidate] (31.181 ms) : 0, 31181
Debugger [baseline] (63.003 ms) : 0, 63003
Debugger [candidate] (64.741 ms) : 0, 64741
Remote Config [baseline] (1.102 ms) : 0, 1102
Remote Config [candidate] (531.815 µs) : 0, 532
Telemetry [baseline] (10.674 ms) : 0, 10674
Telemetry [candidate] (9.928 ms) : 0, 9928
Flare Poller [baseline] (3.487 ms) : 0, 3487
Flare Poller [candidate] (3.564 ms) : 0, 3564
section profiling
crashtracking [baseline] (1.179 ms) : 0, 1179
crashtracking [candidate] (1.182 ms) : 0, 1182
BytebuddyAgent [baseline] (695.649 ms) : 0, 695649
BytebuddyAgent [candidate] (691.699 ms) : 0, 691699
AgentMeter [baseline] (9.162 ms) : 0, 9162
AgentMeter [candidate] (9.124 ms) : 0, 9124
GlobalTracer [baseline] (208.328 ms) : 0, 208328
GlobalTracer [candidate] (208.108 ms) : 0, 208108
AppSec [baseline] (32.95 ms) : 0, 32950
AppSec [candidate] (32.575 ms) : 0, 32575
Debugger [baseline] (66.355 ms) : 0, 66355
Debugger [candidate] (65.469 ms) : 0, 65469
Remote Config [baseline] (588.4 µs) : 0, 588
Remote Config [candidate] (570.179 µs) : 0, 570
Telemetry [baseline] (7.954 ms) : 0, 7954
Telemetry [candidate] (7.806 ms) : 0, 7806
Flare Poller [baseline] (3.632 ms) : 0, 3632
Flare Poller [candidate] (3.548 ms) : 0, 3548
ProfilingAgent [baseline] (94.406 ms) : 0, 94406
ProfilingAgent [candidate] (95.267 ms) : 0, 95267
Profiling [baseline] (94.987 ms) : 0, 94987
Profiling [candidate] (95.836 ms) : 0, 95836

Load

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	dougqh/optimize-propagation-tags
git_commit_date	1776270681	1776270148
git_commit_sha	93449b6f0f	`6d93d59`
release_version	1.62.0-SNAPSHOT~693449b6f0f	1.62.0-SNAPSHOT~6d93d59e66

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1776272454	1776272454
ci_job_id	1598473699	1598473699
ci_pipeline_id	107860904	107860904
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-1-awk22et8 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-1-awk22et8 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

Summary

Found 1 performance improvements and 3 performance regressions! Performance is the same for 16 metrics, 16 unstable metrics.

scenario	Δ mean agg_http_req_duration_p50	Δ mean agg_http_req_duration_p95	Δ mean throughput	candidate mean agg_http_req_duration_p50	candidate mean agg_http_req_duration_p95	candidate mean throughput	baseline mean agg_http_req_duration_p50	baseline mean agg_http_req_duration_p95	baseline mean throughput
scenario:load:insecure-bank:iast:high_load	better [-145.226µs; -70.462µs] or [-5.449%; -2.644%]	unsure [-490.219µs; -144.001µs] or [-6.358%; -1.868%]	unstable [-112.030op/s; +206.530op/s] or [-8.307%; +15.314%]	2.557ms	7.393ms	1395.844op/s	2.665ms	7.710ms	1348.594op/s
scenario:load:insecure-bank:iast_GLOBAL:high_load	worse [+129.573µs; +309.801µs] or [+4.506%; +10.775%]	worse [+253.191µs; +745.116µs] or [+3.158%; +9.294%]	unstable [-228.014op/s; +62.826op/s] or [-17.883%; +4.928%]	3.095ms	8.516ms	1192.406op/s	2.875ms	8.017ms	1275.000op/s
scenario:load:petclinic:tracing:high_load	worse [+0.884ms; +1.887ms] or [+5.055%; +10.783%]	unsure [+0.333ms; +1.912ms] or [+1.163%; +6.682%]	unstable [-39.553op/s; +9.990op/s] or [-15.151%; +3.827%]	18.882ms	29.731ms	246.281op/s	17.496ms	28.609ms	261.062op/s

Request duration reports for petclinic

gantt
    title petclinic - request duration [CI 0.99] : candidate=1.62.0-SNAPSHOT~6d93d59e66, baseline=1.62.0-SNAPSHOT~693449b6f0f
    dateFormat X
    axisFormat %s
section baseline
no_agent (19.496 ms) : 19297, 19695
.   : milestone, 19496,
appsec (18.839 ms) : 18648, 19030
.   : milestone, 18839,
code_origins (18.053 ms) : 17877, 18229
.   : milestone, 18053,
iast (18.036 ms) : 17855, 18216
.   : milestone, 18036,
profiling (18.656 ms) : 18471, 18840
.   : milestone, 18656,
tracing (17.872 ms) : 17693, 18052
.   : milestone, 17872,
section candidate
no_agent (19.646 ms) : 19444, 19849
.   : milestone, 19646,
appsec (18.614 ms) : 18430, 18798
.   : milestone, 18614,
code_origins (18.16 ms) : 17983, 18338
.   : milestone, 18160,
iast (17.788 ms) : 17611, 17964
.   : milestone, 17788,
profiling (18.126 ms) : 17944, 18309
.   : milestone, 18126,
tracing (18.951 ms) : 18763, 19139
.   : milestone, 18951,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	19.496 ms [19.297 ms, 19.695 ms]	-
appsec	18.839 ms [18.648 ms, 19.03 ms]	-657.716 µs (-3.4%)
code_origins	18.053 ms [17.877 ms, 18.229 ms]	-1.443 ms (-7.4%)
iast	18.036 ms [17.855 ms, 18.216 ms]	-1.461 ms (-7.5%)
profiling	18.656 ms [18.471 ms, 18.84 ms]	-840.583 µs (-4.3%)
tracing	17.872 ms [17.693 ms, 18.052 ms]	-1.624 ms (-8.3%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	19.646 ms [19.444 ms, 19.849 ms]	-
appsec	18.614 ms [18.43 ms, 18.798 ms]	-1.033 ms (-5.3%)
code_origins	18.16 ms [17.983 ms, 18.338 ms]	-1.486 ms (-7.6%)
iast	17.788 ms [17.611 ms, 17.964 ms]	-1.859 ms (-9.5%)
profiling	18.126 ms [17.944 ms, 18.309 ms]	-1.52 ms (-7.7%)
tracing	18.951 ms [18.763 ms, 19.139 ms]	-695.57 µs (-3.5%)

Request duration reports for insecure-bank

gantt
    title insecure-bank - request duration [CI 0.99] : candidate=1.62.0-SNAPSHOT~6d93d59e66, baseline=1.62.0-SNAPSHOT~693449b6f0f
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.234 ms) : 1222, 1246
.   : milestone, 1234,
iast (3.397 ms) : 3348, 3445
.   : milestone, 3397,
iast_FULL (6.142 ms) : 6081, 6204
.   : milestone, 6142,
iast_GLOBAL (3.597 ms) : 3546, 3649
.   : milestone, 3597,
profiling (2.065 ms) : 2045, 2084
.   : milestone, 2065,
tracing (1.89 ms) : 1875, 1905
.   : milestone, 1890,
section candidate
no_agent (1.241 ms) : 1229, 1253
.   : milestone, 1241,
iast (3.278 ms) : 3231, 3325
.   : milestone, 3278,
iast_FULL (6.025 ms) : 5964, 6085
.   : milestone, 6025,
iast_GLOBAL (3.851 ms) : 3787, 3916
.   : milestone, 3851,
profiling (2.067 ms) : 2049, 2085
.   : milestone, 2067,
tracing (1.847 ms) : 1832, 1862
.   : milestone, 1847,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.234 ms [1.222 ms, 1.246 ms]	-
iast	3.397 ms [3.348 ms, 3.445 ms]	2.162 ms (175.2%)
iast_FULL	6.142 ms [6.081 ms, 6.204 ms]	4.908 ms (397.7%)
iast_GLOBAL	3.597 ms [3.546 ms, 3.649 ms]	2.363 ms (191.5%)
profiling	2.065 ms [2.045 ms, 2.084 ms]	830.439 µs (67.3%)
tracing	1.89 ms [1.875 ms, 1.905 ms]	655.866 µs (53.1%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.241 ms [1.229 ms, 1.253 ms]	-
iast	3.278 ms [3.231 ms, 3.325 ms]	2.037 ms (164.1%)
iast_FULL	6.025 ms [5.964 ms, 6.085 ms]	4.784 ms (385.5%)
iast_GLOBAL	3.851 ms [3.787 ms, 3.916 ms]	2.611 ms (210.4%)
profiling	2.067 ms [2.049 ms, 2.085 ms]	826.439 µs (66.6%)
tracing	1.847 ms [1.832 ms, 1.862 ms]	605.941 µs (48.8%)

Dacapo

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	dougqh/optimize-propagation-tags
git_commit_date	1776270678	1776270148
git_commit_sha	93449b6f0f	`6d93d59`
release_version	1.62.0-SNAPSHOT~693449b6f0f	1.62.0-SNAPSHOT~6d93d59e66

See matching parameters

	Baseline	Candidate
application	biojava	biojava
ci_job_date	1776272147	1776272147
ci_job_id	1598473700	1598473700
ci_pipeline_id	107860904	107860904
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-3-4r2du1mi 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-3-4r2du1mi 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

Summary

Found 1 performance improvements and 0 performance regressions! Performance is the same for 10 metrics, 1 unstable metrics.

scenario	Δ mean execution_time	candidate mean execution_time	baseline mean execution_time
scenario:dacapo:tomcat:no_agent	better [-58.340µs; -33.822µs] or [-3.937%; -2.283%]	1.436ms	1.482ms

Execution time for biojava

gantt
    title biojava - execution time [CI 0.99] : candidate=1.62.0-SNAPSHOT~6d93d59e66, baseline=1.62.0-SNAPSHOT~693449b6f0f
    dateFormat X
    axisFormat %s
section baseline
no_agent (14.877 s) : 14877000, 14877000
.   : milestone, 14877000,
appsec (15.099 s) : 15099000, 15099000
.   : milestone, 15099000,
iast (18.557 s) : 18557000, 18557000
.   : milestone, 18557000,
iast_GLOBAL (18.165 s) : 18165000, 18165000
.   : milestone, 18165000,
profiling (14.971 s) : 14971000, 14971000
.   : milestone, 14971000,
tracing (14.884 s) : 14884000, 14884000
.   : milestone, 14884000,
section candidate
no_agent (15.526 s) : 15526000, 15526000
.   : milestone, 15526000,
appsec (14.785 s) : 14785000, 14785000
.   : milestone, 14785000,
iast (18.044 s) : 18044000, 18044000
.   : milestone, 18044000,
iast_GLOBAL (18.05 s) : 18050000, 18050000
.   : milestone, 18050000,
profiling (15.415 s) : 15415000, 15415000
.   : milestone, 15415000,
tracing (15.287 s) : 15287000, 15287000
.   : milestone, 15287000,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	14.877 s [14.877 s, 14.877 s]	-
appsec	15.099 s [15.099 s, 15.099 s]	222.0 ms (1.5%)
iast	18.557 s [18.557 s, 18.557 s]	3.68 s (24.7%)
iast_GLOBAL	18.165 s [18.165 s, 18.165 s]	3.288 s (22.1%)
profiling	14.971 s [14.971 s, 14.971 s]	94.0 ms (0.6%)
tracing	14.884 s [14.884 s, 14.884 s]	7.0 ms (0.0%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	15.526 s [15.526 s, 15.526 s]	-
appsec	14.785 s [14.785 s, 14.785 s]	-741.0 ms (-4.8%)
iast	18.044 s [18.044 s, 18.044 s]	2.518 s (16.2%)
iast_GLOBAL	18.05 s [18.05 s, 18.05 s]	2.524 s (16.3%)
profiling	15.415 s [15.415 s, 15.415 s]	-111.0 ms (-0.7%)
tracing	15.287 s [15.287 s, 15.287 s]	-239.0 ms (-1.5%)

Execution time for tomcat

gantt
    title tomcat - execution time [CI 0.99] : candidate=1.62.0-SNAPSHOT~6d93d59e66, baseline=1.62.0-SNAPSHOT~693449b6f0f
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.482 ms) : 1470, 1493
.   : milestone, 1482,
appsec (3.815 ms) : 3593, 4037
.   : milestone, 3815,
iast (2.261 ms) : 2192, 2330
.   : milestone, 2261,
iast_GLOBAL (2.316 ms) : 2246, 2385
.   : milestone, 2316,
profiling (2.109 ms) : 2053, 2164
.   : milestone, 2109,
tracing (2.071 ms) : 2018, 2125
.   : milestone, 2071,
section candidate
no_agent (1.436 ms) : 1424, 1447
.   : milestone, 1436,
appsec (3.8 ms) : 3579, 4021
.   : milestone, 3800,
iast (2.265 ms) : 2196, 2335
.   : milestone, 2265,
iast_GLOBAL (2.308 ms) : 2238, 2378
.   : milestone, 2308,
profiling (2.099 ms) : 2044, 2154
.   : milestone, 2099,
tracing (2.072 ms) : 2018, 2125
.   : milestone, 2072,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.482 ms [1.47 ms, 1.493 ms]	-
appsec	3.815 ms [3.593 ms, 4.037 ms]	2.333 ms (157.5%)
iast	2.261 ms [2.192 ms, 2.33 ms]	779.466 µs (52.6%)
iast_GLOBAL	2.316 ms [2.246 ms, 2.385 ms]	833.898 µs (56.3%)
profiling	2.109 ms [2.053 ms, 2.164 ms]	626.934 µs (42.3%)
tracing	2.071 ms [2.018 ms, 2.125 ms]	589.555 µs (39.8%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.436 ms [1.424 ms, 1.447 ms]	-
appsec	3.8 ms [3.579 ms, 4.021 ms]	2.364 ms (164.7%)
iast	2.265 ms [2.196 ms, 2.335 ms]	829.797 µs (57.8%)
iast_GLOBAL	2.308 ms [2.238 ms, 2.378 ms]	872.535 µs (60.8%)
profiling	2.099 ms [2.044 ms, 2.154 ms]	663.119 µs (46.2%)
tracing	2.072 ms [2.018 ms, 2.125 ms]	636.238 µs (44.3%)

dougqh commented Apr 15, 2026

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Optimize PropagationTags hash/compare and pre-cache decision maker values#11119

Optimize PropagationTags hash/compare and pre-cache decision maker values#11119
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