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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Assign the type: and (comp: or inst:) labels in addition to any other useful labels
Avoid using close, fix, or any linking keywords when referencing an issue
Use solves instead, and assign the PR milestone to the issue
Update the CODEOWNERS file on source file addition, migration, or deletion
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

2026-04-06 18:26:08 UTC ℹ️ MergeQueue: pull request added to the queue

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

2026-04-06 20:27:20 UTC ❌ MergeQueue: The build pipeline has timeout

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	1775555215	1775562250
git_commit_sha	`4fa94c4`	`3cb87b4`
release_version	1.61.0-SNAPSHOT~4fa94c4f4f	1.61.0-SNAPSHOT~3cb87b4db3

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1775564182	1775564182
ci_job_id	1572632017	1572632017
ci_pipeline_id	106361148	106361148
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-qcw8md8s 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-qcw8md8s 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 58 metrics, 13 unstable metrics.

Startup time reports for petclinic

gantt
    title petclinic - global startup overhead: candidate=1.61.0-SNAPSHOT~3cb87b4db3, baseline=1.61.0-SNAPSHOT~4fa94c4f4f

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.066 s) : 0, 1066283
Total [baseline] (11.048 s) : 0, 11048234
Agent [candidate] (1.058 s) : 0, 1058229
Total [candidate] (11.031 s) : 0, 11030942
section appsec
Agent [baseline] (1.252 s) : 0, 1251767
Total [baseline] (11.11 s) : 0, 11109870
Agent [candidate] (1.25 s) : 0, 1250105
Total [candidate] (11.107 s) : 0, 11106650
section iast
Agent [baseline] (1.237 s) : 0, 1236632
Total [baseline] (11.289 s) : 0, 11289461
Agent [candidate] (1.222 s) : 0, 1221925
Total [candidate] (11.278 s) : 0, 11278137
section profiling
Agent [baseline] (1.181 s) : 0, 1180709
Total [baseline] (11.054 s) : 0, 11053891
Agent [candidate] (1.184 s) : 0, 1184177
Total [candidate] (11.176 s) : 0, 11175521

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.066 s	-
Agent	appsec	1.252 s	185.484 ms (17.4%)
Agent	iast	1.237 s	170.349 ms (16.0%)
Agent	profiling	1.181 s	114.426 ms (10.7%)
Total	tracing	11.048 s	-
Total	appsec	11.11 s	61.636 ms (0.6%)
Total	iast	11.289 s	241.227 ms (2.2%)
Total	profiling	11.054 s	5.657 ms (0.1%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.058 s	-
Agent	appsec	1.25 s	191.876 ms (18.1%)
Agent	iast	1.222 s	163.695 ms (15.5%)
Agent	profiling	1.184 s	125.948 ms (11.9%)
Total	tracing	11.031 s	-
Total	appsec	11.107 s	75.709 ms (0.7%)
Total	iast	11.278 s	247.196 ms (2.2%)
Total	profiling	11.176 s	144.58 ms (1.3%)

gantt
    title petclinic - break down per module: candidate=1.61.0-SNAPSHOT~3cb87b4db3, baseline=1.61.0-SNAPSHOT~4fa94c4f4f

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.244 ms) : 0, 1244
crashtracking [candidate] (1.215 ms) : 0, 1215
BytebuddyAgent [baseline] (636.574 ms) : 0, 636574
BytebuddyAgent [candidate] (632.888 ms) : 0, 632888
AgentMeter [baseline] (29.554 ms) : 0, 29554
AgentMeter [candidate] (29.2 ms) : 0, 29200
GlobalTracer [baseline] (250.204 ms) : 0, 250204
GlobalTracer [candidate] (249.96 ms) : 0, 249960
AppSec [baseline] (32.241 ms) : 0, 32241
AppSec [candidate] (32.329 ms) : 0, 32329
Debugger [baseline] (60.18 ms) : 0, 60180
Debugger [candidate] (60.239 ms) : 0, 60239
Remote Config [baseline] (598.587 µs) : 0, 599
Remote Config [candidate] (607.951 µs) : 0, 608
Telemetry [baseline] (8.162 ms) : 0, 8162
Telemetry [candidate] (8.25 ms) : 0, 8250
Flare Poller [baseline] (11.299 ms) : 0, 11299
Flare Poller [candidate] (7.442 ms) : 0, 7442
section appsec
crashtracking [baseline] (1.221 ms) : 0, 1221
crashtracking [candidate] (1.238 ms) : 0, 1238
BytebuddyAgent [baseline] (665.003 ms) : 0, 665003
BytebuddyAgent [candidate] (663.154 ms) : 0, 663154
AgentMeter [baseline] (12.124 ms) : 0, 12124
AgentMeter [candidate] (12.034 ms) : 0, 12034
GlobalTracer [baseline] (249.892 ms) : 0, 249892
GlobalTracer [candidate] (249.701 ms) : 0, 249701
AppSec [baseline] (183.821 ms) : 0, 183821
AppSec [candidate] (184.296 ms) : 0, 184296
Debugger [baseline] (65.981 ms) : 0, 65981
Debugger [candidate] (66.015 ms) : 0, 66015
Remote Config [baseline] (592.892 µs) : 0, 593
Remote Config [candidate] (604.656 µs) : 0, 605
Telemetry [baseline] (8.563 ms) : 0, 8563
Telemetry [candidate] (8.618 ms) : 0, 8618
Flare Poller [baseline] (3.54 ms) : 0, 3540
Flare Poller [candidate] (3.572 ms) : 0, 3572
IAST [baseline] (24.598 ms) : 0, 24598
IAST [candidate] (24.558 ms) : 0, 24558
section iast
crashtracking [baseline] (1.245 ms) : 0, 1245
crashtracking [candidate] (1.215 ms) : 0, 1215
BytebuddyAgent [baseline] (810.428 ms) : 0, 810428
BytebuddyAgent [candidate] (799.36 ms) : 0, 799360
AgentMeter [baseline] (11.742 ms) : 0, 11742
AgentMeter [candidate] (11.345 ms) : 0, 11345
GlobalTracer [baseline] (241.269 ms) : 0, 241269
GlobalTracer [candidate] (238.78 ms) : 0, 238780
AppSec [baseline] (31.123 ms) : 0, 31123
AppSec [candidate] (30.13 ms) : 0, 30130
Debugger [baseline] (61.738 ms) : 0, 61738
Debugger [candidate] (64.074 ms) : 0, 64074
Remote Config [baseline] (1.137 ms) : 0, 1137
Remote Config [candidate] (1.701 ms) : 0, 1701
Telemetry [baseline] (12.246 ms) : 0, 12246
Telemetry [candidate] (9.829 ms) : 0, 9829
Flare Poller [baseline] (3.532 ms) : 0, 3532
Flare Poller [candidate] (3.591 ms) : 0, 3591
IAST [baseline] (25.839 ms) : 0, 25839
IAST [candidate] (25.775 ms) : 0, 25775
section profiling
ProfilingAgent [baseline] (93.437 ms) : 0, 93437
ProfilingAgent [candidate] (93.803 ms) : 0, 93803
crashtracking [baseline] (1.189 ms) : 0, 1189
crashtracking [candidate] (1.179 ms) : 0, 1179
BytebuddyAgent [baseline] (689.534 ms) : 0, 689534
BytebuddyAgent [candidate] (691.614 ms) : 0, 691614
AgentMeter [baseline] (9.095 ms) : 0, 9095
AgentMeter [candidate] (9.129 ms) : 0, 9129
GlobalTracer [baseline] (206.48 ms) : 0, 206480
GlobalTracer [candidate] (207.062 ms) : 0, 207062
AppSec [baseline] (32.34 ms) : 0, 32340
AppSec [candidate] (32.631 ms) : 0, 32631
Debugger [baseline] (65.653 ms) : 0, 65653
Debugger [candidate] (65.568 ms) : 0, 65568
Remote Config [baseline] (567.303 µs) : 0, 567
Remote Config [candidate] (566.07 µs) : 0, 566
Telemetry [baseline] (7.783 ms) : 0, 7783
Telemetry [candidate] (7.839 ms) : 0, 7839
Flare Poller [baseline] (3.565 ms) : 0, 3565
Flare Poller [candidate] (3.552 ms) : 0, 3552
Profiling [baseline] (94.003 ms) : 0, 94003
Profiling [candidate] (94.365 ms) : 0, 94365

Startup time reports for insecure-bank

gantt
    title insecure-bank - global startup overhead: candidate=1.61.0-SNAPSHOT~3cb87b4db3, baseline=1.61.0-SNAPSHOT~4fa94c4f4f

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.068 s) : 0, 1067881
Total [baseline] (8.896 s) : 0, 8896104
Agent [candidate] (1.062 s) : 0, 1061982
Total [candidate] (8.818 s) : 0, 8817716
section iast
Agent [baseline] (1.238 s) : 0, 1238121
Total [baseline] (9.557 s) : 0, 9556655
Agent [candidate] (1.226 s) : 0, 1225808
Total [candidate] (9.548 s) : 0, 9547949

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.068 s	-
Agent	iast	1.238 s	170.241 ms (15.9%)
Total	tracing	8.896 s	-
Total	iast	9.557 s	660.552 ms (7.4%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.062 s	-
Agent	iast	1.226 s	163.826 ms (15.4%)
Total	tracing	8.818 s	-
Total	iast	9.548 s	730.233 ms (8.3%)

gantt
    title insecure-bank - break down per module: candidate=1.61.0-SNAPSHOT~3cb87b4db3, baseline=1.61.0-SNAPSHOT~4fa94c4f4f

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.251 ms) : 0, 1251
crashtracking [candidate] (1.226 ms) : 0, 1226
BytebuddyAgent [baseline] (641.767 ms) : 0, 641767
BytebuddyAgent [candidate] (637.313 ms) : 0, 637313
AgentMeter [baseline] (29.803 ms) : 0, 29803
AgentMeter [candidate] (29.528 ms) : 0, 29528
GlobalTracer [baseline] (251.254 ms) : 0, 251254
GlobalTracer [candidate] (251.083 ms) : 0, 251083
AppSec [baseline] (32.496 ms) : 0, 32496
AppSec [candidate] (32.448 ms) : 0, 32448
Debugger [baseline] (59.457 ms) : 0, 59457
Debugger [candidate] (59.498 ms) : 0, 59498
Remote Config [baseline] (598.04 µs) : 0, 598
Remote Config [candidate] (602.803 µs) : 0, 603
Telemetry [baseline] (8.158 ms) : 0, 8158
Telemetry [candidate] (8.213 ms) : 0, 8213
Flare Poller [baseline] (6.66 ms) : 0, 6660
Flare Poller [candidate] (5.815 ms) : 0, 5815
section iast
crashtracking [baseline] (1.252 ms) : 0, 1252
crashtracking [candidate] (1.232 ms) : 0, 1232
BytebuddyAgent [baseline] (814.008 ms) : 0, 814008
BytebuddyAgent [candidate] (803.308 ms) : 0, 803308
AgentMeter [baseline] (11.815 ms) : 0, 11815
AgentMeter [candidate] (11.381 ms) : 0, 11381
GlobalTracer [baseline] (240.337 ms) : 0, 240337
GlobalTracer [candidate] (239.644 ms) : 0, 239644
IAST [baseline] (25.911 ms) : 0, 25911
IAST [candidate] (25.81 ms) : 0, 25810
AppSec [baseline] (31.017 ms) : 0, 31017
AppSec [candidate] (30.981 ms) : 0, 30981
Debugger [baseline] (60.987 ms) : 0, 60987
Debugger [candidate] (62.045 ms) : 0, 62045
Remote Config [baseline] (531.565 µs) : 0, 532
Remote Config [candidate] (1.139 ms) : 0, 1139
Telemetry [baseline] (11.781 ms) : 0, 11781
Telemetry [candidate] (10.473 ms) : 0, 10473
Flare Poller [baseline] (3.613 ms) : 0, 3613
Flare Poller [candidate] (3.631 ms) : 0, 3631

Load

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	jb/live_heap_default
git_commit_date	1775555215	1775562250
git_commit_sha	`4fa94c4`	`3cb87b4`
release_version	1.61.0-SNAPSHOT~4fa94c4f4f	1.61.0-SNAPSHOT~3cb87b4db3

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1775564664	1775564664
ci_job_id	1572632019	1572632019
ci_pipeline_id	106361148	106361148
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-w9itraxw 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-w9itraxw 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 0 performance regressions! Performance is the same for 16 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_GLOBAL:high_load	better [-248.659µs; -111.112µs] or [-8.471%; -3.785%]	better [-598.378µs; -221.306µs] or [-7.295%; -2.698%]	unstable [-62.791op/s; +214.291op/s] or [-5.072%; +17.310%]	2.756ms	7.793ms	1313.719op/s	2.936ms	8.203ms	1237.969op/s

Request duration reports for petclinic

gantt
    title petclinic - request duration [CI 0.99] : candidate=1.61.0-SNAPSHOT~3cb87b4db3, baseline=1.61.0-SNAPSHOT~4fa94c4f4f
    dateFormat X
    axisFormat %s
section baseline
no_agent (17.996 ms) : 17812, 18180
.   : milestone, 17996,
appsec (18.493 ms) : 18307, 18679
.   : milestone, 18493,
code_origins (18.007 ms) : 17825, 18189
.   : milestone, 18007,
iast (18.059 ms) : 17882, 18237
.   : milestone, 18059,
profiling (18.663 ms) : 18483, 18843
.   : milestone, 18663,
tracing (17.814 ms) : 17636, 17991
.   : milestone, 17814,
section candidate
no_agent (18.215 ms) : 18028, 18403
.   : milestone, 18215,
appsec (18.998 ms) : 18809, 19187
.   : milestone, 18998,
code_origins (17.872 ms) : 17699, 18044
.   : milestone, 17872,
iast (17.995 ms) : 17820, 18170
.   : milestone, 17995,
profiling (18.653 ms) : 18468, 18839
.   : milestone, 18653,
tracing (17.847 ms) : 17674, 18020
.   : milestone, 17847,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	17.996 ms [17.812 ms, 18.18 ms]	-
appsec	18.493 ms [18.307 ms, 18.679 ms]	497.205 µs (2.8%)
code_origins	18.007 ms [17.825 ms, 18.189 ms]	10.958 µs (0.1%)
iast	18.059 ms [17.882 ms, 18.237 ms]	63.33 µs (0.4%)
profiling	18.663 ms [18.483 ms, 18.843 ms]	666.569 µs (3.7%)
tracing	17.814 ms [17.636 ms, 17.991 ms]	-182.427 µs (-1.0%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	18.215 ms [18.028 ms, 18.403 ms]	-
appsec	18.998 ms [18.809 ms, 19.187 ms]	782.842 µs (4.3%)
code_origins	17.872 ms [17.699 ms, 18.044 ms]	-343.668 µs (-1.9%)
iast	17.995 ms [17.82 ms, 18.17 ms]	-220.644 µs (-1.2%)
profiling	18.653 ms [18.468 ms, 18.839 ms]	437.887 µs (2.4%)
tracing	17.847 ms [17.674 ms, 18.02 ms]	-368.29 µs (-2.0%)

Request duration reports for insecure-bank

gantt
    title insecure-bank - request duration [CI 0.99] : candidate=1.61.0-SNAPSHOT~3cb87b4db3, baseline=1.61.0-SNAPSHOT~4fa94c4f4f
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.282 ms) : 1269, 1295
.   : milestone, 1282,
iast (3.179 ms) : 3135, 3222
.   : milestone, 3179,
iast_FULL (6.097 ms) : 6033, 6161
.   : milestone, 6097,
iast_GLOBAL (3.708 ms) : 3647, 3768
.   : milestone, 3708,
profiling (2.31 ms) : 2289, 2331
.   : milestone, 2310,
tracing (1.87 ms) : 1855, 1886
.   : milestone, 1870,
section candidate
no_agent (1.233 ms) : 1222, 1245
.   : milestone, 1233,
iast (3.205 ms) : 3163, 3248
.   : milestone, 3205,
iast_FULL (5.899 ms) : 5839, 5959
.   : milestone, 5899,
iast_GLOBAL (3.489 ms) : 3439, 3540
.   : milestone, 3489,
profiling (2.178 ms) : 2158, 2197
.   : milestone, 2178,
tracing (1.914 ms) : 1896, 1932
.   : milestone, 1914,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.282 ms [1.269 ms, 1.295 ms]	-
iast	3.179 ms [3.135 ms, 3.222 ms]	1.897 ms (147.9%)
iast_FULL	6.097 ms [6.033 ms, 6.161 ms]	4.815 ms (375.5%)
iast_GLOBAL	3.708 ms [3.647 ms, 3.768 ms]	2.425 ms (189.1%)
profiling	2.31 ms [2.289 ms, 2.331 ms]	1.028 ms (80.2%)
tracing	1.87 ms [1.855 ms, 1.886 ms]	587.834 µs (45.8%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.233 ms [1.222 ms, 1.245 ms]	-
iast	3.205 ms [3.163 ms, 3.248 ms]	1.972 ms (159.9%)
iast_FULL	5.899 ms [5.839 ms, 5.959 ms]	4.665 ms (378.2%)
iast_GLOBAL	3.489 ms [3.439 ms, 3.54 ms]	2.256 ms (182.9%)
profiling	2.178 ms [2.158 ms, 2.197 ms]	944.373 µs (76.6%)
tracing	1.914 ms [1.896 ms, 1.932 ms]	680.901 µs (55.2%)

Dacapo

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	jb/live_heap_default
git_commit_date	1775555215	1775562250
git_commit_sha	`4fa94c4`	`3cb87b4`
release_version	1.61.0-SNAPSHOT~4fa94c4f4f	1.61.0-SNAPSHOT~3cb87b4db3

See matching parameters

	Baseline	Candidate
application	biojava	biojava
ci_job_date	1775564406	1775564406
ci_job_id	1572632021	1572632021
ci_pipeline_id	106361148	106361148
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-2-gxuuomfl 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-2-gxuuomfl 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 11 metrics, 1 unstable metrics.

Execution time for biojava

gantt
    title biojava - execution time [CI 0.99] : candidate=1.61.0-SNAPSHOT~3cb87b4db3, baseline=1.61.0-SNAPSHOT~4fa94c4f4f
    dateFormat X
    axisFormat %s
section baseline
no_agent (14.953 s) : 14953000, 14953000
.   : milestone, 14953000,
appsec (14.619 s) : 14619000, 14619000
.   : milestone, 14619000,
iast (18.313 s) : 18313000, 18313000
.   : milestone, 18313000,
iast_GLOBAL (17.913 s) : 17913000, 17913000
.   : milestone, 17913000,
profiling (15.394 s) : 15394000, 15394000
.   : milestone, 15394000,
tracing (15.116 s) : 15116000, 15116000
.   : milestone, 15116000,
section candidate
no_agent (14.945 s) : 14945000, 14945000
.   : milestone, 14945000,
appsec (14.647 s) : 14647000, 14647000
.   : milestone, 14647000,
iast (18.493 s) : 18493000, 18493000
.   : milestone, 18493000,
iast_GLOBAL (17.277 s) : 17277000, 17277000
.   : milestone, 17277000,
profiling (15.015 s) : 15015000, 15015000
.   : milestone, 15015000,
tracing (14.884 s) : 14884000, 14884000
.   : milestone, 14884000,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	14.953 s [14.953 s, 14.953 s]	-
appsec	14.619 s [14.619 s, 14.619 s]	-334.0 ms (-2.2%)
iast	18.313 s [18.313 s, 18.313 s]	3.36 s (22.5%)
iast_GLOBAL	17.913 s [17.913 s, 17.913 s]	2.96 s (19.8%)
profiling	15.394 s [15.394 s, 15.394 s]	441.0 ms (2.9%)
tracing	15.116 s [15.116 s, 15.116 s]	163.0 ms (1.1%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	14.945 s [14.945 s, 14.945 s]	-
appsec	14.647 s [14.647 s, 14.647 s]	-298.0 ms (-2.0%)
iast	18.493 s [18.493 s, 18.493 s]	3.548 s (23.7%)
iast_GLOBAL	17.277 s [17.277 s, 17.277 s]	2.332 s (15.6%)
profiling	15.015 s [15.015 s, 15.015 s]	70.0 ms (0.5%)
tracing	14.884 s [14.884 s, 14.884 s]	-61.0 ms (-0.4%)

Execution time for tomcat

gantt
    title tomcat - execution time [CI 0.99] : candidate=1.61.0-SNAPSHOT~3cb87b4db3, baseline=1.61.0-SNAPSHOT~4fa94c4f4f
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.488 ms) : 1476, 1500
.   : milestone, 1488,
appsec (3.772 ms) : 3552, 3992
.   : milestone, 3772,
iast (2.281 ms) : 2211, 2351
.   : milestone, 2281,
iast_GLOBAL (2.317 ms) : 2247, 2387
.   : milestone, 2317,
profiling (2.106 ms) : 2051, 2161
.   : milestone, 2106,
tracing (2.082 ms) : 2028, 2136
.   : milestone, 2082,
section candidate
no_agent (1.491 ms) : 1480, 1503
.   : milestone, 1491,
appsec (3.831 ms) : 3609, 4052
.   : milestone, 3831,
iast (2.274 ms) : 2205, 2344
.   : milestone, 2274,
iast_GLOBAL (2.324 ms) : 2254, 2394
.   : milestone, 2324,
profiling (2.094 ms) : 2039, 2149
.   : milestone, 2094,
tracing (2.077 ms) : 2023, 2131
.   : milestone, 2077,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.488 ms [1.476 ms, 1.5 ms]	-
appsec	3.772 ms [3.552 ms, 3.992 ms]	2.284 ms (153.5%)
iast	2.281 ms [2.211 ms, 2.351 ms]	793.038 µs (53.3%)
iast_GLOBAL	2.317 ms [2.247 ms, 2.387 ms]	828.74 µs (55.7%)
profiling	2.106 ms [2.051 ms, 2.161 ms]	618.136 µs (41.5%)
tracing	2.082 ms [2.028 ms, 2.136 ms]	593.771 µs (39.9%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.491 ms [1.48 ms, 1.503 ms]	-
appsec	3.831 ms [3.609 ms, 4.052 ms]	2.339 ms (156.9%)
iast	2.274 ms [2.205 ms, 2.344 ms]	782.832 µs (52.5%)
iast_GLOBAL	2.324 ms [2.254 ms, 2.394 ms]	832.321 µs (55.8%)
profiling	2.094 ms [2.039 ms, 2.149 ms]	602.851 µs (40.4%)
tracing	2.077 ms [2.023 ms, 2.131 ms]	585.451 µs (39.3%)

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 · 2026-04-07T12:44:03Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-04-07T12:44:09Z

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2026-04-07 12:44:09 UTC ℹ️ Start processing command /merge

2026-04-07 12:44:14 UTC ℹ️ MergeQueue: pull request added to the queue

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

2026-04-07 13:51:02 UTC ℹ️ MergeQueue: This merge request was merged

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

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gh-worker-dd-mergequeue-cf854d bot merged commit 7d1e329 into master Apr 7, 2026
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gh-worker-dd-mergequeue-cf854d bot deleted the jb/live_heap_default branch April 7, 2026 13:50

github-actions bot added this to the 1.61.0 milestone Apr 7, 2026

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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
gh-worker-dd-mergequeue-cf854d[bot] merged 3 commits intomasterfrom
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