Enable live heap profiling by default on safe JVM versions by jbachorik · Pull Request #11039 · DataDog/dd-trace-java

jbachorik · 2026-04-02T10:50:59Z

What Does This Do

Changes profiling.heap.enabled from a JFR-only flag (default false) to a unified live heap master switch that auto-detects safe systems and enables live heap profiling by default. The ddprof native library is prioritized, with JFR jdk.OldObjectSample as an automatic fallback when ddprof is not active.

Enablement Logic

flowchart TD
    A["profiling.heap.enabled\n(unified master switch)\ndefault: isLiveHeapProfilingSafe()"]
    A -->|"false"| B["ALL live heap OFF\n(ddprof + JFR)"]
    A -->|"unset or true"| C{Split into two paths}

    C --> D["ddprof path\nDatadogProfilerConfig"]
    C --> E["JFR path\nOpenJdkController"]

    D --> J11{"Java 11+?\n(JVMTI Allocation Sampler\nrequired)"}
    J11 -->|no| J11NO["ddprof MEMLEAK OFF\n(JFR fallback if available)"]
    J11 -->|yes| F["profiling.ddprof.liveheap.enabled"]
    F -->|"false"| G["MEMLEAK OFF"]
    F -->|"unset or true"\ndefault = isJmethodIDSafe| H{"JVM safe?\n11.0.23+, 17.0.11+,\n21.0.3+, 22+"}
    H -->|yes| I[MEMLEAK ON]
    H -->|no| JWARN["MEMLEAK ON\n⚠️ warn: not stable on this JVM"]

    G --> GCHK{"JFR OldObjectSample\navailable?\n11.0.12+, 17.0.3+, 18+"}
    GCHK -->|no| GWARN["⚠️ warn: live heap\nwill be inactive"]
    GCHK -->|yes| GOK[JFR fallback active]

    E --> EJCHK{"Java 11+ AND\nddprof likely active?\n(liveheap default = isJmethodIDSafe())"}
    EJCHK -->|yes| NOKEY_OFF["OldObjectSample OFF\n(ddprof handles live heap)"]
    EJCHK -->|no| NOKEY_JFP{"JFR OldObjectSample\navailable?\n11.0.12+, 17.0.3+, 18+"}
    NOKEY_JFP -->|yes| O["OldObjectSample ON\n(JFR fallback)"]
    NOKEY_JFP -->|no| P["OldObjectSample OFF\n⚠️ warn if explicitly enabled"]

    style B fill:#f66,color:#fff
    style G fill:#f66,color:#fff
    style J11NO fill:#f66,color:#fff
    style NOKEY_OFF fill:#69c,color:#fff
    style P fill:#f66,color:#fff
    style GWARN fill:#fa0,color:#fff
    style I fill:#6b6,color:#fff
    style JWARN fill:#fa0,color:#fff
    style O fill:#6b6,color:#fff
    style GOK fill:#6b6,color:#fff

Note: When ddprof MEMLEAK is active, disableOverriddenEvents() at recording start also disables jdk.OldObjectSample as a safety net. The proactive disable in the constructor ensures the settings map is consistent from the start. On Java 8, no live heap mechanism is available — neither ddprof (requires JVMTI Allocation Sampler, Java 11+) nor JFR OldObjectSample (not safe on Java 8). Explicitly setting profiling.heap.enabled=true on Java 8 logs a warning but has no effect.

Motivation

Live heap profiling provides valuable memory leak detection but was previously opt-in (profiling.ddprof.liveheap.enabled defaulted to false). Users had to know about and explicitly enable it.

This change makes it enabled by default on safe systems, matching the pattern already used by allocation profiling. The two live heap mechanisms (ddprof native and JFR OldObjectSample) are now unified under profiling.heap.enabled with automatic fallback.

PROF-14188

Additional Notes

profiling.heap.enabled semantics changed: was JFR-only (default false), now unified master switch (default auto-detect via ProfilingSupport.isLiveHeapProfilingSafe())
isLiveHeapProfilingSafe() = isJmethodIDSafe() || isOldObjectSampleAvailable() (moved to ProfilingSupport)
ddprof live heap requires Java 11+ (JVMTI Allocation Sampler), same gate as allocation profiling
The ddprof-specific key default changed from hardcoded false to dynamic isJmethodIDSafe()
The ddprofLikelyActive heuristic in OpenJdkController uses isJmethodIDSafe() as the default for the liveheap flag, matching ddprof's own resolution logic — prevents silently losing live heap on versions where OldObjectSample is available but ddprof won't actually enable MEMLEAK (e.g. Java 11.0.12–11.0.22, 17.0.3–17.0.10)
On Java 8, no live heap mechanism is available; profiling.heap.enabled=true logs a warning but has no effect
When ddprof is disabled and JFR OldObjectSample is not available, a warning is logged that live heap will be inactive
Pre-existing bug fixed: isEventEnabled was called with jdk.OldObjectSample#enabled which resulted in a double #enabled lookup, making the warning dead code

Contributor Checklist

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Use solves instead, and assign the PR milestone to the issue
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Update public documentation with any new configuration flags or behaviors

Jira ticket: PROF-14188

Note: Once your PR is ready to merge, add it to the merge queue by commenting /merge. /merge -c cancels the queue request. /merge -f --reason "reason" skips all merge queue checks; please use this judiciously, as some checks do not run at the PR-level. For more information, see this doc.

Adds unified config key `profiling.liveheap.enabled` that auto-detects safe systems (isJmethodIDSafe || isOldObjectSampleAvailable) and enables live heap profiling by default. Ddprof native library is preferred with JFR OldObjectSample as fallback. New `profiling.liveheap.jfr.enabled` replaces deprecated `profiling.heap.enabled` with context-aware deprecation warnings. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

jbachorik · 2026-04-06T18:26:00Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-04-06T18:26:04Z

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2026-04-06 18:26:04 UTC ℹ️ Start processing command /merge

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The merge request has been interrupted because the build 106243977 took longer than expected. The current limit for the base branch 'master' is 120 minutes.

pr-commenter · 2026-04-07T07:08:06Z

Benchmarks

⚠️ Warning: Baseline build not found for merge-base commit. Comparing against the latest commit on master instead.

Startup

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	jb/live_heap_default
git_commit_date	1775511532	1775542787
git_commit_sha	`3123b19`	`749172f`
release_version	1.61.0-SNAPSHOT~3123b191d9	1.61.0-SNAPSHOT~749172f660

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1775544645	1775544645
ci_job_id	1571867603	1571867603
ci_pipeline_id	106319190	106319190
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-wae9n8j5 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-wae9n8j5 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 0 performance improvements and 0 performance regressions! Performance is the same for 56 metrics, 15 unstable metrics.

Startup time reports for insecure-bank

gantt
    title insecure-bank - global startup overhead: candidate=1.61.0-SNAPSHOT~749172f660, baseline=1.61.0-SNAPSHOT~3123b191d9

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.076 s) : 0, 1076144
Total [baseline] (8.889 s) : 0, 8888522
Agent [candidate] (1.055 s) : 0, 1054513
Total [candidate] (8.831 s) : 0, 8830568
section iast
Agent [baseline] (1.231 s) : 0, 1231188
Total [baseline] (9.555 s) : 0, 9554629
Agent [candidate] (1.228 s) : 0, 1228321
Total [candidate] (9.563 s) : 0, 9563025

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.076 s	-
Agent	iast	1.231 s	155.045 ms (14.4%)
Total	tracing	8.889 s	-
Total	iast	9.555 s	666.107 ms (7.5%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.055 s	-
Agent	iast	1.228 s	173.808 ms (16.5%)
Total	tracing	8.831 s	-
Total	iast	9.563 s	732.456 ms (8.3%)

gantt
    title insecure-bank - break down per module: candidate=1.61.0-SNAPSHOT~749172f660, baseline=1.61.0-SNAPSHOT~3123b191d9

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.262 ms) : 0, 1262
crashtracking [candidate] (1.224 ms) : 0, 1224
BytebuddyAgent [baseline] (645.072 ms) : 0, 645072
BytebuddyAgent [candidate] (631.623 ms) : 0, 631623
AgentMeter [baseline] (29.864 ms) : 0, 29864
AgentMeter [candidate] (29.229 ms) : 0, 29229
GlobalTracer [baseline] (252.474 ms) : 0, 252474
GlobalTracer [candidate] (248.366 ms) : 0, 248366
AppSec [baseline] (32.521 ms) : 0, 32521
AppSec [candidate] (32.038 ms) : 0, 32038
Debugger [baseline] (59.905 ms) : 0, 59905
Debugger [candidate] (59.116 ms) : 0, 59116
Remote Config [baseline] (626.741 µs) : 0, 627
Remote Config [candidate] (662.015 µs) : 0, 662
Telemetry [baseline] (8.212 ms) : 0, 8212
Telemetry [candidate] (8.084 ms) : 0, 8084
Flare Poller [baseline] (9.691 ms) : 0, 9691
Flare Poller [candidate] (8.107 ms) : 0, 8107
section iast
crashtracking [baseline] (1.245 ms) : 0, 1245
crashtracking [candidate] (1.227 ms) : 0, 1227
BytebuddyAgent [baseline] (807.3 ms) : 0, 807300
BytebuddyAgent [candidate] (805.534 ms) : 0, 805534
AgentMeter [baseline] (11.634 ms) : 0, 11634
AgentMeter [candidate] (11.613 ms) : 0, 11613
GlobalTracer [baseline] (240.178 ms) : 0, 240178
GlobalTracer [candidate] (239.552 ms) : 0, 239552
IAST [baseline] (26.1 ms) : 0, 26100
IAST [candidate] (25.943 ms) : 0, 25943
AppSec [baseline] (31.973 ms) : 0, 31973
AppSec [candidate] (32.592 ms) : 0, 32592
Debugger [baseline] (60.746 ms) : 0, 60746
Debugger [candidate] (59.7 ms) : 0, 59700
Remote Config [baseline] (1.147 ms) : 0, 1147
Remote Config [candidate] (631.329 µs) : 0, 631
Telemetry [baseline] (10.966 ms) : 0, 10966
Telemetry [candidate] (11.346 ms) : 0, 11346
Flare Poller [baseline] (3.461 ms) : 0, 3461
Flare Poller [candidate] (3.865 ms) : 0, 3865

Startup time reports for petclinic

gantt
    title petclinic - global startup overhead: candidate=1.61.0-SNAPSHOT~749172f660, baseline=1.61.0-SNAPSHOT~3123b191d9

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.055 s) : 0, 1055284
Total [baseline] (11.083 s) : 0, 11082800
Agent [candidate] (1.059 s) : 0, 1058579
Total [candidate] (11.096 s) : 0, 11096067
section appsec
Agent [baseline] (1.247 s) : 0, 1247436
Total [baseline] (11.09 s) : 0, 11089943
Agent [candidate] (1.247 s) : 0, 1246609
Total [candidate] (11.285 s) : 0, 11285329
section iast
Agent [baseline] (1.225 s) : 0, 1225496
Total [baseline] (11.282 s) : 0, 11282306
Agent [candidate] (1.227 s) : 0, 1227356
Total [candidate] (11.314 s) : 0, 11314374
section profiling
Agent [baseline] (1.186 s) : 0, 1185607
Total [baseline] (11.016 s) : 0, 11016050
Agent [candidate] (1.187 s) : 0, 1186582
Total [candidate] (11.175 s) : 0, 11175443

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.055 s	-
Agent	appsec	1.247 s	192.151 ms (18.2%)
Agent	iast	1.225 s	170.212 ms (16.1%)
Agent	profiling	1.186 s	130.323 ms (12.3%)
Total	tracing	11.083 s	-
Total	appsec	11.09 s	7.143 ms (0.1%)
Total	iast	11.282 s	199.506 ms (1.8%)
Total	profiling	11.016 s	-66.75 ms (-0.6%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.059 s	-
Agent	appsec	1.247 s	188.029 ms (17.8%)
Agent	iast	1.227 s	168.777 ms (15.9%)
Agent	profiling	1.187 s	128.003 ms (12.1%)
Total	tracing	11.096 s	-
Total	appsec	11.285 s	189.262 ms (1.7%)
Total	iast	11.314 s	218.307 ms (2.0%)
Total	profiling	11.175 s	79.376 ms (0.7%)

gantt
    title petclinic - break down per module: candidate=1.61.0-SNAPSHOT~749172f660, baseline=1.61.0-SNAPSHOT~3123b191d9

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.235 ms) : 0, 1235
crashtracking [candidate] (1.237 ms) : 0, 1237
BytebuddyAgent [baseline] (631.868 ms) : 0, 631868
BytebuddyAgent [candidate] (633.277 ms) : 0, 633277
AgentMeter [baseline] (29.228 ms) : 0, 29228
AgentMeter [candidate] (29.218 ms) : 0, 29218
GlobalTracer [baseline] (248.49 ms) : 0, 248490
GlobalTracer [candidate] (248.726 ms) : 0, 248726
AppSec [baseline] (31.926 ms) : 0, 31926
AppSec [candidate] (32.053 ms) : 0, 32053
Debugger [baseline] (59.775 ms) : 0, 59775
Debugger [candidate] (60.021 ms) : 0, 60021
Remote Config [baseline] (595.863 µs) : 0, 596
Remote Config [candidate] (616.573 µs) : 0, 617
Telemetry [baseline] (8.034 ms) : 0, 8034
Telemetry [candidate] (8.071 ms) : 0, 8071
Flare Poller [baseline] (8.04 ms) : 0, 8040
Flare Poller [candidate] (8.98 ms) : 0, 8980
section appsec
crashtracking [baseline] (1.224 ms) : 0, 1224
crashtracking [candidate] (1.218 ms) : 0, 1218
BytebuddyAgent [baseline] (661.162 ms) : 0, 661162
BytebuddyAgent [candidate] (660.669 ms) : 0, 660669
AgentMeter [baseline] (12.029 ms) : 0, 12029
AgentMeter [candidate] (12.098 ms) : 0, 12098
GlobalTracer [baseline] (249.102 ms) : 0, 249102
GlobalTracer [candidate] (248.829 ms) : 0, 248829
IAST [baseline] (24.584 ms) : 0, 24584
IAST [candidate] (24.529 ms) : 0, 24529
AppSec [baseline] (183.824 ms) : 0, 183824
AppSec [candidate] (183.628 ms) : 0, 183628
Debugger [baseline] (66.26 ms) : 0, 66260
Debugger [candidate] (66.303 ms) : 0, 66303
Remote Config [baseline] (615.448 µs) : 0, 615
Remote Config [candidate] (605.214 µs) : 0, 605
Telemetry [baseline] (8.658 ms) : 0, 8658
Telemetry [candidate] (8.789 ms) : 0, 8789
Flare Poller [baseline] (3.56 ms) : 0, 3560
Flare Poller [candidate] (3.617 ms) : 0, 3617
section iast
crashtracking [baseline] (1.234 ms) : 0, 1234
crashtracking [candidate] (1.23 ms) : 0, 1230
BytebuddyAgent [baseline] (802.259 ms) : 0, 802259
BytebuddyAgent [candidate] (802.47 ms) : 0, 802470
AgentMeter [baseline] (11.427 ms) : 0, 11427
AgentMeter [candidate] (11.489 ms) : 0, 11489
GlobalTracer [baseline] (239.493 ms) : 0, 239493
GlobalTracer [candidate] (240.294 ms) : 0, 240294
IAST [baseline] (25.812 ms) : 0, 25812
IAST [candidate] (25.89 ms) : 0, 25890
AppSec [baseline] (30.974 ms) : 0, 30974
AppSec [candidate] (30.308 ms) : 0, 30308
Debugger [baseline] (63.035 ms) : 0, 63035
Debugger [candidate] (64.229 ms) : 0, 64229
Remote Config [baseline] (1.144 ms) : 0, 1144
Remote Config [candidate] (549.763 µs) : 0, 550
Telemetry [baseline] (10.26 ms) : 0, 10260
Telemetry [candidate] (11.152 ms) : 0, 11152
Flare Poller [baseline] (3.614 ms) : 0, 3614
Flare Poller [candidate] (3.621 ms) : 0, 3621
section profiling
crashtracking [baseline] (1.186 ms) : 0, 1186
crashtracking [candidate] (1.188 ms) : 0, 1188
BytebuddyAgent [baseline] (692.371 ms) : 0, 692371
BytebuddyAgent [candidate] (691.139 ms) : 0, 691139
AgentMeter [baseline] (9.167 ms) : 0, 9167
AgentMeter [candidate] (9.155 ms) : 0, 9155
GlobalTracer [baseline] (207.499 ms) : 0, 207499
GlobalTracer [candidate] (208.251 ms) : 0, 208251
AppSec [baseline] (32.6 ms) : 0, 32600
AppSec [candidate] (32.853 ms) : 0, 32853
Debugger [baseline] (65.776 ms) : 0, 65776
Debugger [candidate] (66.164 ms) : 0, 66164
Remote Config [baseline] (574.093 µs) : 0, 574
Remote Config [candidate] (571.893 µs) : 0, 572
Telemetry [baseline] (7.855 ms) : 0, 7855
Telemetry [candidate] (7.866 ms) : 0, 7866
Flare Poller [baseline] (3.535 ms) : 0, 3535
Flare Poller [candidate] (3.642 ms) : 0, 3642
ProfilingAgent [baseline] (93.665 ms) : 0, 93665
ProfilingAgent [candidate] (94.533 ms) : 0, 94533
Profiling [baseline] (94.24 ms) : 0, 94240
Profiling [candidate] (95.12 ms) : 0, 95120

Load

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	jb/live_heap_default
git_commit_date	1775511532	1775542787
git_commit_sha	`3123b19`	`749172f`
release_version	1.61.0-SNAPSHOT~3123b191d9	1.61.0-SNAPSHOT~749172f660

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1775545116	1775545116
ci_job_id	1571867604	1571867604
ci_pipeline_id	106319190	106319190
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-0-83enq1g7 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-0-83enq1g7 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 2 performance improvements and 2 performance regressions! Performance is the same for 14 metrics, 18 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	worse [+94.698µs; +207.173µs] or [+3.895%; +8.520%]	worse [+158.505µs; +618.336µs] or [+2.219%; +8.657%]	unstable [-220.690op/s; +87.565op/s] or [-15.147%; +6.010%]	2.582ms	7.531ms	1390.406op/s	2.432ms	7.142ms	1456.969op/s
scenario:load:petclinic:tracing:high_load	better [-1.644ms; -0.841ms] or [-8.858%; -4.535%]	better [-2.277ms; -0.961ms] or [-7.601%; -3.208%]	unstable [-10.510op/s; +44.385op/s] or [-4.255%; +17.970%]	17.313ms	28.342ms	263.938op/s	18.555ms	29.961ms	247.000op/s

Request duration reports for petclinic

gantt
    title petclinic - request duration [CI 0.99] : candidate=1.61.0-SNAPSHOT~749172f660, baseline=1.61.0-SNAPSHOT~3123b191d9
    dateFormat X
    axisFormat %s
section baseline
no_agent (18.492 ms) : 18303, 18681
.   : milestone, 18492,
appsec (18.952 ms) : 18762, 19142
.   : milestone, 18952,
code_origins (17.735 ms) : 17560, 17909
.   : milestone, 17735,
iast (18.197 ms) : 18018, 18376
.   : milestone, 18197,
profiling (19.341 ms) : 19145, 19537
.   : milestone, 19341,
tracing (18.897 ms) : 18708, 19086
.   : milestone, 18897,
section candidate
no_agent (17.641 ms) : 17461, 17821
.   : milestone, 17641,
appsec (18.857 ms) : 18665, 19049
.   : milestone, 18857,
code_origins (18.208 ms) : 18025, 18392
.   : milestone, 18208,
iast (18.194 ms) : 18016, 18373
.   : milestone, 18194,
profiling (18.508 ms) : 18323, 18693
.   : milestone, 18508,
tracing (17.674 ms) : 17501, 17847
.   : milestone, 17674,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	18.492 ms [18.303 ms, 18.681 ms]	-
appsec	18.952 ms [18.762 ms, 19.142 ms]	460.307 µs (2.5%)
code_origins	17.735 ms [17.56 ms, 17.909 ms]	-756.948 µs (-4.1%)
iast	18.197 ms [18.018 ms, 18.376 ms]	-294.825 µs (-1.6%)
profiling	19.341 ms [19.145 ms, 19.537 ms]	849.676 µs (4.6%)
tracing	18.897 ms [18.708 ms, 19.086 ms]	405.02 µs (2.2%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	17.641 ms [17.461 ms, 17.821 ms]	-
appsec	18.857 ms [18.665 ms, 19.049 ms]	1.216 ms (6.9%)
code_origins	18.208 ms [18.025 ms, 18.392 ms]	567.699 µs (3.2%)
iast	18.194 ms [18.016 ms, 18.373 ms]	553.279 µs (3.1%)
profiling	18.508 ms [18.323 ms, 18.693 ms]	867.248 µs (4.9%)
tracing	17.674 ms [17.501 ms, 17.847 ms]	33.562 µs (0.2%)

Request duration reports for insecure-bank

gantt
    title insecure-bank - request duration [CI 0.99] : candidate=1.61.0-SNAPSHOT~749172f660, baseline=1.61.0-SNAPSHOT~3123b191d9
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.249 ms) : 1237, 1262
.   : milestone, 1249,
iast (3.139 ms) : 3096, 3182
.   : milestone, 3139,
iast_FULL (5.941 ms) : 5881, 6000
.   : milestone, 5941,
iast_GLOBAL (3.501 ms) : 3447, 3555
.   : milestone, 3501,
profiling (2.313 ms) : 2292, 2335
.   : milestone, 2313,
tracing (1.982 ms) : 1964, 2001
.   : milestone, 1982,
section candidate
no_agent (1.258 ms) : 1245, 1271
.   : milestone, 1258,
iast (3.292 ms) : 3250, 3333
.   : milestone, 3292,
iast_FULL (5.997 ms) : 5937, 6056
.   : milestone, 5997,
iast_GLOBAL (3.564 ms) : 3511, 3618
.   : milestone, 3564,
profiling (2.322 ms) : 2295, 2349
.   : milestone, 2322,
tracing (1.931 ms) : 1915, 1947
.   : milestone, 1931,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.249 ms [1.237 ms, 1.262 ms]	-
iast	3.139 ms [3.096 ms, 3.182 ms]	1.89 ms (151.3%)
iast_FULL	5.941 ms [5.881 ms, 6.0 ms]	4.691 ms (375.5%)
iast_GLOBAL	3.501 ms [3.447 ms, 3.555 ms]	2.252 ms (180.3%)
profiling	2.313 ms [2.292 ms, 2.335 ms]	1.064 ms (85.2%)
tracing	1.982 ms [1.964 ms, 2.001 ms]	732.938 µs (58.7%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.258 ms [1.245 ms, 1.271 ms]	-
iast	3.292 ms [3.25 ms, 3.333 ms]	2.034 ms (161.7%)
iast_FULL	5.997 ms [5.937 ms, 6.056 ms]	4.739 ms (376.7%)
iast_GLOBAL	3.564 ms [3.511 ms, 3.618 ms]	2.307 ms (183.4%)
profiling	2.322 ms [2.295 ms, 2.349 ms]	1.064 ms (84.6%)
tracing	1.931 ms [1.915 ms, 1.947 ms]	673.051 µs (53.5%)

Dacapo

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	jb/live_heap_default
git_commit_date	1775511532	1775542787
git_commit_sha	`3123b19`	`749172f`
release_version	1.61.0-SNAPSHOT~3123b191d9	1.61.0-SNAPSHOT~749172f660

See matching parameters

	Baseline	Candidate
application	biojava	biojava
ci_job_date	1775544894	1775544894
ci_job_id	1571867605	1571867605
ci_pipeline_id	106319190	106319190
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-de5ztdmu 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-de5ztdmu 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 0 performance improvements and 0 performance regressions! Performance is the same for 10 metrics, 2 unstable metrics.

Execution time for biojava

gantt
    title biojava - execution time [CI 0.99] : candidate=1.61.0-SNAPSHOT~749172f660, baseline=1.61.0-SNAPSHOT~3123b191d9
    dateFormat X
    axisFormat %s
section baseline
no_agent (15.426 s) : 15426000, 15426000
.   : milestone, 15426000,
appsec (14.509 s) : 14509000, 14509000
.   : milestone, 14509000,
iast (18.258 s) : 18258000, 18258000
.   : milestone, 18258000,
iast_GLOBAL (17.883 s) : 17883000, 17883000
.   : milestone, 17883000,
profiling (15.026 s) : 15026000, 15026000
.   : milestone, 15026000,
tracing (14.993 s) : 14993000, 14993000
.   : milestone, 14993000,
section candidate
no_agent (15.564 s) : 15564000, 15564000
.   : milestone, 15564000,
appsec (14.833 s) : 14833000, 14833000
.   : milestone, 14833000,
iast (18.508 s) : 18508000, 18508000
.   : milestone, 18508000,
iast_GLOBAL (17.99 s) : 17990000, 17990000
.   : milestone, 17990000,
profiling (14.705 s) : 14705000, 14705000
.   : milestone, 14705000,
tracing (14.945 s) : 14945000, 14945000
.   : milestone, 14945000,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	15.426 s [15.426 s, 15.426 s]	-
appsec	14.509 s [14.509 s, 14.509 s]	-917.0 ms (-5.9%)
iast	18.258 s [18.258 s, 18.258 s]	2.832 s (18.4%)
iast_GLOBAL	17.883 s [17.883 s, 17.883 s]	2.457 s (15.9%)
profiling	15.026 s [15.026 s, 15.026 s]	-400.0 ms (-2.6%)
tracing	14.993 s [14.993 s, 14.993 s]	-433.0 ms (-2.8%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	15.564 s [15.564 s, 15.564 s]	-
appsec	14.833 s [14.833 s, 14.833 s]	-731.0 ms (-4.7%)
iast	18.508 s [18.508 s, 18.508 s]	2.944 s (18.9%)
iast_GLOBAL	17.99 s [17.99 s, 17.99 s]	2.426 s (15.6%)
profiling	14.705 s [14.705 s, 14.705 s]	-859.0 ms (-5.5%)
tracing	14.945 s [14.945 s, 14.945 s]	-619.0 ms (-4.0%)

Execution time for tomcat

gantt
    title tomcat - execution time [CI 0.99] : candidate=1.61.0-SNAPSHOT~749172f660, baseline=1.61.0-SNAPSHOT~3123b191d9
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.488 ms) : 1476, 1499
.   : milestone, 1488,
appsec (3.782 ms) : 3565, 4000
.   : milestone, 3782,
iast (2.274 ms) : 2205, 2344
.   : milestone, 2274,
iast_GLOBAL (2.319 ms) : 2249, 2389
.   : milestone, 2319,
profiling (2.128 ms) : 2071, 2185
.   : milestone, 2128,
tracing (2.107 ms) : 2052, 2161
.   : milestone, 2107,
section candidate
no_agent (1.487 ms) : 1476, 1499
.   : milestone, 1487,
appsec (3.825 ms) : 3604, 4047
.   : milestone, 3825,
iast (2.276 ms) : 2206, 2346
.   : milestone, 2276,
iast_GLOBAL (2.326 ms) : 2256, 2397
.   : milestone, 2326,
profiling (2.511 ms) : 2298, 2724
.   : milestone, 2511,
tracing (2.095 ms) : 2041, 2149
.   : milestone, 2095,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.488 ms [1.476 ms, 1.499 ms]	-
appsec	3.782 ms [3.565 ms, 4.0 ms]	2.295 ms (154.3%)
iast	2.274 ms [2.205 ms, 2.344 ms]	786.604 µs (52.9%)
iast_GLOBAL	2.319 ms [2.249 ms, 2.389 ms]	831.486 µs (55.9%)
profiling	2.128 ms [2.071 ms, 2.185 ms]	640.491 µs (43.1%)
tracing	2.107 ms [2.052 ms, 2.161 ms]	619.088 µs (41.6%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.487 ms [1.476 ms, 1.499 ms]	-
appsec	3.825 ms [3.604 ms, 4.047 ms]	2.338 ms (157.2%)
iast	2.276 ms [2.206 ms, 2.346 ms]	788.777 µs (53.0%)
iast_GLOBAL	2.326 ms [2.256 ms, 2.397 ms]	839.134 µs (56.4%)
profiling	2.511 ms [2.298 ms, 2.724 ms]	1.024 ms (68.8%)
tracing	2.095 ms [2.041 ms, 2.149 ms]	607.585 µs (40.9%)

jbachorik · 2026-04-07T09:45:43Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-04-07T09:45:47Z

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2026-04-07 09:45:47 UTC ℹ️ Start processing command /merge

2026-04-07 09:45:51 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in master is approximately 2h (p90).

2026-04-07 11:44:30 UTC ❌ MergeQueue: This merge request was updated

This PR is rejected because it was updated

- On Java 8, neither ddprof MEMLEAK (requires Java 11+) nor JFR OldObjectSample is available; explicitly enabling profiling.heap.enabled now logs a warning instead of silently enabling an unsupported event - ddprofLikelyActive heuristic uses isJmethodIDSafe() as the default for the liveheap flag (was hardcoded true), matching ddprof's own resolution and preventing false disablement of OldObjectSample on Java 11.0.12-11.0.22 and 17.0.3-17.0.10 - Fix testHeapProfilerIsStillOverriddenThroughConfig to expect isOldObjectSampleAvailable() instead of unconditional true Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

jbachorik added comp: profiling Profiling type: enhancement Enhancements and improvements tag: ai generated Largely based on code generated by an AI or LLM labels Apr 2, 2026

jbachorik force-pushed the jb/live_heap_default branch 13 times, most recently from 0ac4316 to ca7960a Compare April 3, 2026 09:35

jbachorik marked this pull request as ready for review April 3, 2026 09:48

jbachorik requested a review from a team as a code owner April 3, 2026 09:49

jbachorik force-pushed the jb/live_heap_default branch from ca7960a to 868c547 Compare April 3, 2026 10:04

zhengyu123 approved these changes Apr 6, 2026

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Merge branch 'master' into jb/live_heap_default

749172f

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Enable live heap profiling by default on safe JVM versions#11039

Enable live heap profiling by default on safe JVM versions#11039
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