[dougqh]

What Does This Do

Debugger tests now close the CoreTracers they build.

Motivation

:dd-java-agent:agent-debugger:test runs out of its 512 MB heap on master.

• What a heap dump showed: 46 PayloadDispatcherImpl instances retained 225 MB, 65% of the heap, about 5.2 MB each.
• What holds them: live TraceProcessingWorker serializer threads.
• Why: eight test classes call CoreTracer.builder().build(), which uses the default agent writer, and never close the tracer. The writer's thread stays alive and pins its msgpack buffer, created on the first trace written. ExceptionProbeInstrumentationTest builds one per test in @BeforeEach, and Add coordinated sampling for snapshot probes #12452 added CoordinatedSamplingTest with nine more call sites.

The fix:

• Each test keeps a reference to the tracer it builds and closes it in teardown.
• For CapturingTestBase subclasses, that's a shared field, closed in CapturingTestBase.after().
• LogProbeTest builds several per test, so it closes them in a list @AfterEach.

The test task now completes: 950 tests, 15 skipped, no failures, no OOM.

Additional Notes

Test-only change.

🤖 Generated with Claude Code

[pr-commenter]

Debugger benchmarks

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
ci_job_date	1792799525	1792799853
end_time	2026-10-23T23:53:36	2026-10-23T23:59:04
git_branch	master	dougqh/debugger-tests-close-tracers
git_commit_sha	13d72f6	d3ba02a
start_time	2026-10-23T23:52:06	2026-10-23T23:57:34

See matching parameters

	Baseline	Candidate
ci_job_id	2172854612	2172854612
ci_pipeline_id	147248372	147248372
cpu_model	Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz
git_commit_date	1792798792	1792798792

Summary

Found 0 performance improvements and 0 performance regressions! Performance is the same for 9 metrics, 6 unstable metrics.

See unchanged results

scenario	Δ mean agg_http_req_duration_min	Δ mean agg_http_req_duration_p50	Δ mean agg_http_req_duration_p75	Δ mean agg_http_req_duration_p99	Δ mean throughput
scenario:noprobe	unstable [-26.101µs; +22.079µs] or [-7.762%; +6.566%]	unstable [-33178.133ns; +34497.880ns] or [-8.965%; +9.322%]	unstable [-43155.422ns; +44099.367ns] or [-11.214%; +11.459%]	unstable [-52.532µs; +181.403µs] or [-4.810%; +16.609%]	same
scenario:basic	same	same	same	unstable [+197.595µs; +476.904µs] or [+23.122%; +55.805%]	unstable [-132.690op/s; +132.690op/s] or [-5.971%; +5.971%]
scenario:loop	same	same	same	same	same

Request duration reports for reports

gantt
    title reports - request duration [CI 0.99] : candidate=None, baseline=None
    dateFormat X
    axisFormat %s
section baseline
noprobe (370.086 µs) : 331, 410
.   : milestone, 370,
basic (343.305 µs) : 337, 349
.   : milestone, 343,
loop (8.116 ms) : 8052, 8180
.   : milestone, 8116,
section candidate
noprobe (370.746 µs) : 348, 393
.   : milestone, 371,
basic (345.424 µs) : 338, 353
.   : milestone, 345,
loop (8.123 ms) : 8060, 8187
.   : milestone, 8123,

Loading

• baseline results

Scenario	Request median duration [CI 0.99]
noprobe	370.086 µs [330.501 µs, 409.672 µs]
basic	343.305 µs [337.261 µs, 349.35 µs]
loop	8.116 ms [8.052 ms, 8.18 ms]

• candidate results

Scenario	Request median duration [CI 0.99]
noprobe	370.746 µs [348.45 µs, 393.043 µs]
basic	345.424 µs [337.773 µs, 353.076 µs]
loop	8.123 ms [8.06 ms, 8.187 ms]

[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	13.95 s	13.88 s	[-0.3%; +1.2%] (no difference)
startup:insecure-bank:tracing:Agent	12.94 s	12.98 s	[-1.0%; +0.5%] (no difference)
startup:petclinic:appsec:Agent	17.16 s	16.98 s	[+0.1%; +2.0%] (maybe worse)
startup:petclinic:iast:Agent	16.96 s	17.00 s	[-1.0%; +0.5%] (no difference)
startup:petclinic:profiling:Agent	16.54 s	16.12 s	[-2.0%; +7.1%] (no difference)
startup:petclinic:sca:Agent	17.13 s	16.89 s	[+0.5%; +2.3%] (maybe worse)
startup:petclinic:tracing:Agent	16.04 s	16.15 s	[-1.6%; +0.3%] (no difference)

Commit: d3ba02ac · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.