Adding lighter String processing methods to Strings by dougqh · Pull Request #10640 · DataDog/dd-trace-java

dougqh · 2026-02-19T15:38:18Z

What Does This Do

Adds to StringUtils

fast replaceAll for a fixed string & replacement, 3x throughput compared to regex based solutions, 1/2x allocation compared to compiled regex solutions
added SubSequence which provides a view into a subsequence of a String without incurring significant extra allocation
Strings.spliit returns an Iterable can be used to do light weight simple String parsing

Motivation

In subsequent PRs, these will be used to reduce allocation from String processing throughout dd-trace-java
The first focus area for improvement is QueryObfuscator

Additional Notes

Contributor Checklist

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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: [PROJ-IDENT]

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- fast replaceAll for a fixed string & replacement, 3x throughput compared to regex based solutions, 1/2x allocation compared to regex solutions - added SubSequence which provides a view into a subsequence of a String without incurring extra allocation - Strings.spliit returns an Iterable<SubSequence> can be used to do light weight processing of a String

pr-commenter · 2026-02-19T16:42:47Z

Benchmarks

Startup

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	dougqh/strings-improvements
git_commit_date	1772200579	1772204328
git_commit_sha	`c6896b7`	`80b454c`
release_version	1.60.0-SNAPSHOT~c6896b7cf7	1.60.0-SNAPSHOT~80b454c348

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1772206189	1772206189
ci_job_id	1462843532	1462843532
ci_pipeline_id	99436554	99436554
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-ork9da58 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-ork9da58 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 1 performance regressions! Performance is the same for 59 metrics, 10 unstable metrics.

scenario	Δ mean execution_time	candidate mean execution_time	baseline mean execution_time
scenario:startup:insecure-bank:tracing:Debugger	worse [+2.157ms; +7.291ms] or [+3.536%; +11.950%]	65.733ms	61.009ms
scenario:startup:insecure-bank:tracing:Remote Config	better [-66.900µs; -25.301µs] or [-10.350%; -3.914%]	600.278µs	646.378µs

Startup time reports for insecure-bank

gantt
    title insecure-bank - global startup overhead: candidate=1.60.0-SNAPSHOT~80b454c348, baseline=1.60.0-SNAPSHOT~c6896b7cf7

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.066 s) : 0, 1065574
Total [baseline] (8.764 s) : 0, 8763519
Agent [candidate] (1.067 s) : 0, 1066788
Total [candidate] (8.757 s) : 0, 8757483
section iast
Agent [baseline] (1.245 s) : 0, 1244697
Total [baseline] (9.368 s) : 0, 9368390
Agent [candidate] (1.229 s) : 0, 1229311
Total [candidate] (9.379 s) : 0, 9378595

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.066 s	-
Agent	iast	1.245 s	179.123 ms (16.8%)
Total	tracing	8.764 s	-
Total	iast	9.368 s	604.871 ms (6.9%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.067 s	-
Agent	iast	1.229 s	162.523 ms (15.2%)
Total	tracing	8.757 s	-
Total	iast	9.379 s	621.112 ms (7.1%)

gantt
    title insecure-bank - break down per module: candidate=1.60.0-SNAPSHOT~80b454c348, baseline=1.60.0-SNAPSHOT~c6896b7cf7

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.206 ms) : 0, 1206
crashtracking [candidate] (1.197 ms) : 0, 1197
BytebuddyAgent [baseline] (627.517 ms) : 0, 627517
BytebuddyAgent [candidate] (628.677 ms) : 0, 628677
AgentMeter [baseline] (29.248 ms) : 0, 29248
AgentMeter [candidate] (29.072 ms) : 0, 29072
GlobalTracer [baseline] (258.78 ms) : 0, 258780
GlobalTracer [candidate] (257.763 ms) : 0, 257763
AppSec [baseline] (33.328 ms) : 0, 33328
AppSec [candidate] (32.966 ms) : 0, 32966
Debugger [baseline] (61.009 ms) : 0, 61009
Debugger [candidate] (65.733 ms) : 0, 65733
Remote Config [baseline] (646.378 µs) : 0, 646
Remote Config [candidate] (600.278 µs) : 0, 600
Telemetry [baseline] (12.258 ms) : 0, 12258
Telemetry [candidate] (9.979 ms) : 0, 9979
Flare Poller [baseline] (5.398 ms) : 0, 5398
Flare Poller [candidate] (4.595 ms) : 0, 4595
section iast
crashtracking [baseline] (1.229 ms) : 0, 1229
crashtracking [candidate] (1.192 ms) : 0, 1192
BytebuddyAgent [baseline] (807.466 ms) : 0, 807466
BytebuddyAgent [candidate] (794.468 ms) : 0, 794468
AgentMeter [baseline] (11.527 ms) : 0, 11527
AgentMeter [candidate] (11.319 ms) : 0, 11319
GlobalTracer [baseline] (248.466 ms) : 0, 248466
GlobalTracer [candidate] (246.98 ms) : 0, 246980
IAST [baseline] (27.189 ms) : 0, 27189
IAST [candidate] (27.138 ms) : 0, 27138
AppSec [baseline] (33.537 ms) : 0, 33537
AppSec [candidate] (34.206 ms) : 0, 34206
Debugger [baseline] (66.221 ms) : 0, 66221
Debugger [candidate] (65.342 ms) : 0, 65342
Remote Config [baseline] (535.424 µs) : 0, 535
Remote Config [candidate] (535.886 µs) : 0, 536
Telemetry [baseline] (8.687 ms) : 0, 8687
Telemetry [candidate] (8.624 ms) : 0, 8624
Flare Poller [baseline] (3.448 ms) : 0, 3448
Flare Poller [candidate] (3.454 ms) : 0, 3454

Startup time reports for petclinic

gantt
    title petclinic - global startup overhead: candidate=1.60.0-SNAPSHOT~80b454c348, baseline=1.60.0-SNAPSHOT~c6896b7cf7

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.064 s) : 0, 1063550
Total [baseline] (10.782 s) : 0, 10782453
Agent [candidate] (1.073 s) : 0, 1073422
Total [candidate] (11.01 s) : 0, 11010175
section appsec
Agent [baseline] (1.241 s) : 0, 1240843
Total [baseline] (11.076 s) : 0, 11075730
Agent [candidate] (1.253 s) : 0, 1253056
Total [candidate] (11.099 s) : 0, 11098613
section iast
Agent [baseline] (1.231 s) : 0, 1230908
Total [baseline] (11.209 s) : 0, 11209226
Agent [candidate] (1.23 s) : 0, 1230030
Total [candidate] (11.19 s) : 0, 11190242
section profiling
Agent [baseline] (1.193 s) : 0, 1193105
Total [baseline] (11.023 s) : 0, 11023235
Agent [candidate] (1.198 s) : 0, 1198030
Total [candidate] (10.948 s) : 0, 10947792

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.064 s	-
Agent	appsec	1.241 s	177.293 ms (16.7%)
Agent	iast	1.231 s	167.358 ms (15.7%)
Agent	profiling	1.193 s	129.555 ms (12.2%)
Total	tracing	10.782 s	-
Total	appsec	11.076 s	293.277 ms (2.7%)
Total	iast	11.209 s	426.773 ms (4.0%)
Total	profiling	11.023 s	240.782 ms (2.2%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.073 s	-
Agent	appsec	1.253 s	179.633 ms (16.7%)
Agent	iast	1.23 s	156.608 ms (14.6%)
Agent	profiling	1.198 s	124.608 ms (11.6%)
Total	tracing	11.01 s	-
Total	appsec	11.099 s	88.438 ms (0.8%)
Total	iast	11.19 s	180.067 ms (1.6%)
Total	profiling	10.948 s	-62.383 ms (-0.6%)

gantt
    title petclinic - break down per module: candidate=1.60.0-SNAPSHOT~80b454c348, baseline=1.60.0-SNAPSHOT~c6896b7cf7

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.181 ms) : 0, 1181
crashtracking [candidate] (1.197 ms) : 0, 1197
BytebuddyAgent [baseline] (626.725 ms) : 0, 626725
BytebuddyAgent [candidate] (631.737 ms) : 0, 631737
AgentMeter [baseline] (29.046 ms) : 0, 29046
AgentMeter [candidate] (29.35 ms) : 0, 29350
GlobalTracer [baseline] (257.328 ms) : 0, 257328
GlobalTracer [candidate] (259.221 ms) : 0, 259221
AppSec [baseline] (32.968 ms) : 0, 32968
AppSec [candidate] (33.329 ms) : 0, 33329
Debugger [baseline] (65.037 ms) : 0, 65037
Debugger [candidate] (66.23 ms) : 0, 66230
Remote Config [baseline] (612.862 µs) : 0, 613
Remote Config [candidate] (607.301 µs) : 0, 607
Telemetry [baseline] (10.755 ms) : 0, 10755
Telemetry [candidate] (10.777 ms) : 0, 10777
Flare Poller [baseline] (3.789 ms) : 0, 3789
Flare Poller [candidate] (4.643 ms) : 0, 4643
section appsec
crashtracking [baseline] (1.195 ms) : 0, 1195
crashtracking [candidate] (1.224 ms) : 0, 1224
BytebuddyAgent [baseline] (658.282 ms) : 0, 658282
BytebuddyAgent [candidate] (666.751 ms) : 0, 666751
AgentMeter [baseline] (12.029 ms) : 0, 12029
AgentMeter [candidate] (12.121 ms) : 0, 12121
GlobalTracer [baseline] (258.706 ms) : 0, 258706
GlobalTracer [candidate] (261.076 ms) : 0, 261076
AppSec [baseline] (168.147 ms) : 0, 168147
AppSec [candidate] (168.941 ms) : 0, 168941
Debugger [baseline] (66.998 ms) : 0, 66998
Debugger [candidate] (67.089 ms) : 0, 67089
Remote Config [baseline] (684.151 µs) : 0, 684
Remote Config [candidate] (710.071 µs) : 0, 710
Telemetry [baseline] (9.475 ms) : 0, 9475
Telemetry [candidate] (9.318 ms) : 0, 9318
Flare Poller [baseline] (3.696 ms) : 0, 3696
Flare Poller [candidate] (3.682 ms) : 0, 3682
IAST [baseline] (25.415 ms) : 0, 25415
IAST [candidate] (25.707 ms) : 0, 25707
section iast
crashtracking [baseline] (1.191 ms) : 0, 1191
crashtracking [candidate] (1.196 ms) : 0, 1196
BytebuddyAgent [baseline] (794.443 ms) : 0, 794443
BytebuddyAgent [candidate] (794.374 ms) : 0, 794374
AgentMeter [baseline] (11.33 ms) : 0, 11330
AgentMeter [candidate] (11.311 ms) : 0, 11311
GlobalTracer [baseline] (247.017 ms) : 0, 247017
GlobalTracer [candidate] (246.942 ms) : 0, 246942
AppSec [baseline] (35.083 ms) : 0, 35083
AppSec [candidate] (34.124 ms) : 0, 34124
Debugger [baseline] (65.78 ms) : 0, 65780
Debugger [candidate] (66.499 ms) : 0, 66499
Remote Config [baseline] (550.831 µs) : 0, 551
Remote Config [candidate] (529.664 µs) : 0, 530
Telemetry [baseline] (8.715 ms) : 0, 8715
Telemetry [candidate] (8.639 ms) : 0, 8639
Flare Poller [baseline] (3.45 ms) : 0, 3450
Flare Poller [candidate] (3.439 ms) : 0, 3439
IAST [baseline] (27.203 ms) : 0, 27203
IAST [candidate] (26.891 ms) : 0, 26891
section profiling
ProfilingAgent [baseline] (99.685 ms) : 0, 99685
ProfilingAgent [candidate] (100.641 ms) : 0, 100641
crashtracking [baseline] (1.21 ms) : 0, 1210
crashtracking [candidate] (1.172 ms) : 0, 1172
BytebuddyAgent [baseline] (683.535 ms) : 0, 683535
BytebuddyAgent [candidate] (685.599 ms) : 0, 685599
AgentMeter [baseline] (8.584 ms) : 0, 8584
AgentMeter [candidate] (8.654 ms) : 0, 8654
GlobalTracer [baseline] (216.035 ms) : 0, 216035
GlobalTracer [candidate] (216.85 ms) : 0, 216850
AppSec [baseline] (32.663 ms) : 0, 32663
AppSec [candidate] (32.702 ms) : 0, 32702
Debugger [baseline] (67.173 ms) : 0, 67173
Debugger [candidate] (66.882 ms) : 0, 66882
Remote Config [baseline] (634.793 µs) : 0, 635
Remote Config [candidate] (639.285 µs) : 0, 639
Telemetry [baseline] (8.944 ms) : 0, 8944
Telemetry [candidate] (9.835 ms) : 0, 9835
Flare Poller [baseline] (3.727 ms) : 0, 3727
Flare Poller [candidate] (3.791 ms) : 0, 3791
Profiling [baseline] (100.276 ms) : 0, 100276
Profiling [candidate] (101.22 ms) : 0, 101220

Load

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	dougqh/strings-improvements
git_commit_date	1772200579	1772204328
git_commit_sha	`c6896b7`	`80b454c`
release_version	1.60.0-SNAPSHOT~c6896b7cf7	1.60.0-SNAPSHOT~80b454c348

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1772206855	1772206855
ci_job_id	1462843533	1462843533
ci_pipeline_id	99436554	99436554
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-tk6xra9w 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-tk6xra9w 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 2 performance regressions! Performance is the same for 16 metrics, 17 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	worse [+200.395µs; +308.764µs] or [+7.492%; +11.544%]	worse [+239.615µs; +600.482µs] or [+3.122%; +7.825%]	unstable [-253.765op/s; +42.265op/s] or [-18.809%; +3.133%]	2.929ms	8.094ms	1243.406op/s	2.675ms	7.674ms	1349.156op/s
scenario:load:petclinic:appsec:high_load	better [-1119.043µs; -385.336µs] or [-5.866%; -2.020%]	unsure [-1.874ms; -0.582ms] or [-6.089%; -1.890%]	unstable [-18.374op/s; +36.999op/s] or [-7.636%; +15.376%]	18.324ms	29.547ms	249.938op/s	19.076ms	30.774ms	240.625op/s

Request duration reports for petclinic

gantt
    title petclinic - request duration [CI 0.99] : candidate=1.60.0-SNAPSHOT~80b454c348, baseline=1.60.0-SNAPSHOT~c6896b7cf7
    dateFormat X
    axisFormat %s
section baseline
no_agent (18.174 ms) : 17986, 18363
.   : milestone, 18174,
appsec (19.402 ms) : 19203, 19601
.   : milestone, 19402,
code_origins (17.579 ms) : 17402, 17755
.   : milestone, 17579,
iast (18.89 ms) : 18699, 19082
.   : milestone, 18890,
profiling (18.746 ms) : 18560, 18931
.   : milestone, 18746,
tracing (17.616 ms) : 17445, 17787
.   : milestone, 17616,
section candidate
no_agent (18.898 ms) : 18703, 19093
.   : milestone, 18898,
appsec (18.674 ms) : 18488, 18859
.   : milestone, 18674,
code_origins (17.35 ms) : 17179, 17521
.   : milestone, 17350,
iast (18.025 ms) : 17846, 18204
.   : milestone, 18025,
profiling (18.718 ms) : 18530, 18906
.   : milestone, 18718,
tracing (17.701 ms) : 17523, 17879
.   : milestone, 17701,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	18.174 ms [17.986 ms, 18.363 ms]	-
appsec	19.402 ms [19.203 ms, 19.601 ms]	1.227 ms (6.8%)
code_origins	17.579 ms [17.402 ms, 17.755 ms]	-595.449 µs (-3.3%)
iast	18.89 ms [18.699 ms, 19.082 ms]	715.897 µs (3.9%)
profiling	18.746 ms [18.56 ms, 18.931 ms]	571.178 µs (3.1%)
tracing	17.616 ms [17.445 ms, 17.787 ms]	-558.451 µs (-3.1%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	18.898 ms [18.703 ms, 19.093 ms]	-
appsec	18.674 ms [18.488 ms, 18.859 ms]	-224.381 µs (-1.2%)
code_origins	17.35 ms [17.179 ms, 17.521 ms]	-1.548 ms (-8.2%)
iast	18.025 ms [17.846 ms, 18.204 ms]	-873.367 µs (-4.6%)
profiling	18.718 ms [18.53 ms, 18.906 ms]	-180.135 µs (-1.0%)
tracing	17.701 ms [17.523 ms, 17.879 ms]	-1.197 ms (-6.3%)

Request duration reports for insecure-bank

gantt
    title insecure-bank - request duration [CI 0.99] : candidate=1.60.0-SNAPSHOT~80b454c348, baseline=1.60.0-SNAPSHOT~c6896b7cf7
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.174 ms) : 1162, 1185
.   : milestone, 1174,
iast (3.214 ms) : 3173, 3256
.   : milestone, 3214,
iast_FULL (5.892 ms) : 5832, 5952
.   : milestone, 5892,
iast_GLOBAL (3.396 ms) : 3354, 3438
.   : milestone, 3396,
profiling (2.114 ms) : 2095, 2133
.   : milestone, 2114,
tracing (1.819 ms) : 1804, 1835
.   : milestone, 1819,
section candidate
no_agent (1.165 ms) : 1154, 1177
.   : milestone, 1165,
iast (3.217 ms) : 3174, 3259
.   : milestone, 3217,
iast_FULL (5.848 ms) : 5789, 5907
.   : milestone, 5848,
iast_GLOBAL (3.691 ms) : 3630, 3752
.   : milestone, 3691,
profiling (2.332 ms) : 2310, 2353
.   : milestone, 2332,
tracing (1.812 ms) : 1797, 1827
.   : milestone, 1812,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.174 ms [1.162 ms, 1.185 ms]	-
iast	3.214 ms [3.173 ms, 3.256 ms]	2.041 ms (173.9%)
iast_FULL	5.892 ms [5.832 ms, 5.952 ms]	4.718 ms (402.0%)
iast_GLOBAL	3.396 ms [3.354 ms, 3.438 ms]	2.222 ms (189.3%)
profiling	2.114 ms [2.095 ms, 2.133 ms]	939.779 µs (80.1%)
tracing	1.819 ms [1.804 ms, 1.835 ms]	645.583 µs (55.0%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.165 ms [1.154 ms, 1.177 ms]	-
iast	3.217 ms [3.174 ms, 3.259 ms]	2.051 ms (176.0%)
iast_FULL	5.848 ms [5.789 ms, 5.907 ms]	4.683 ms (401.9%)
iast_GLOBAL	3.691 ms [3.63 ms, 3.752 ms]	2.526 ms (216.8%)
profiling	2.332 ms [2.31 ms, 2.353 ms]	1.167 ms (100.1%)
tracing	1.812 ms [1.797 ms, 1.827 ms]	646.838 µs (55.5%)

Dacapo

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	dougqh/strings-improvements
git_commit_date	1772200579	1772204328
git_commit_sha	`c6896b7`	`80b454c`
release_version	1.60.0-SNAPSHOT~c6896b7cf7	1.60.0-SNAPSHOT~80b454c348

See matching parameters

	Baseline	Candidate
application	biojava	biojava
ci_job_date	1772206532	1772206532
ci_job_id	1462843535	1462843535
ci_pipeline_id	99436554	99436554
cpu_model	Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-3-wey4o12n 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-wey4o12n 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 tomcat

gantt
    title tomcat - execution time [CI 0.99] : candidate=1.60.0-SNAPSHOT~80b454c348, baseline=1.60.0-SNAPSHOT~c6896b7cf7
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.482 ms) : 1470, 1493
.   : milestone, 1482,
appsec (4.274 ms) : 4018, 4530
.   : milestone, 4274,
iast (2.653 ms) : 2543, 2762
.   : milestone, 2653,
iast_GLOBAL (2.706 ms) : 2596, 2816
.   : milestone, 2706,
profiling (2.46 ms) : 2368, 2553
.   : milestone, 2460,
tracing (2.406 ms) : 2318, 2494
.   : milestone, 2406,
section candidate
no_agent (1.485 ms) : 1473, 1497
.   : milestone, 1485,
appsec (4.188 ms) : 3934, 4442
.   : milestone, 4188,
iast (2.658 ms) : 2548, 2768
.   : milestone, 2658,
iast_GLOBAL (2.71 ms) : 2600, 2821
.   : milestone, 2710,
profiling (2.434 ms) : 2344, 2524
.   : milestone, 2434,
tracing (2.42 ms) : 2331, 2509
.   : milestone, 2420,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.482 ms [1.47 ms, 1.493 ms]	-
appsec	4.274 ms [4.018 ms, 4.53 ms]	2.793 ms (188.5%)
iast	2.653 ms [2.543 ms, 2.762 ms]	1.171 ms (79.0%)
iast_GLOBAL	2.706 ms [2.596 ms, 2.816 ms]	1.224 ms (82.6%)
profiling	2.46 ms [2.368 ms, 2.553 ms]	978.929 µs (66.1%)
tracing	2.406 ms [2.318 ms, 2.494 ms]	924.645 µs (62.4%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.485 ms [1.473 ms, 1.497 ms]	-
appsec	4.188 ms [3.934 ms, 4.442 ms]	2.704 ms (182.1%)
iast	2.658 ms [2.548 ms, 2.768 ms]	1.173 ms (79.0%)
iast_GLOBAL	2.71 ms [2.6 ms, 2.821 ms]	1.226 ms (82.5%)
profiling	2.434 ms [2.344 ms, 2.524 ms]	949.0 µs (63.9%)
tracing	2.42 ms [2.331 ms, 2.509 ms]	934.754 µs (63.0%)

Execution time for biojava

gantt
    title biojava - execution time [CI 0.99] : candidate=1.60.0-SNAPSHOT~80b454c348, baseline=1.60.0-SNAPSHOT~c6896b7cf7
    dateFormat X
    axisFormat %s
section baseline
no_agent (14.499 s) : 14499000, 14499000
.   : milestone, 14499000,
appsec (14.336 s) : 14336000, 14336000
.   : milestone, 14336000,
iast (17.162 s) : 17162000, 17162000
.   : milestone, 17162000,
iast_GLOBAL (17.085 s) : 17085000, 17085000
.   : milestone, 17085000,
profiling (14.214 s) : 14214000, 14214000
.   : milestone, 14214000,
tracing (14.23 s) : 14230000, 14230000
.   : milestone, 14230000,
section candidate
no_agent (15.08 s) : 15080000, 15080000
.   : milestone, 15080000,
appsec (14.228 s) : 14228000, 14228000
.   : milestone, 14228000,
iast (17.366 s) : 17366000, 17366000
.   : milestone, 17366000,
iast_GLOBAL (17.148 s) : 17148000, 17148000
.   : milestone, 17148000,
profiling (14.412 s) : 14412000, 14412000
.   : milestone, 14412000,
tracing (14.298 s) : 14298000, 14298000
.   : milestone, 14298000,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	14.499 s [14.499 s, 14.499 s]	-
appsec	14.336 s [14.336 s, 14.336 s]	-163.0 ms (-1.1%)
iast	17.162 s [17.162 s, 17.162 s]	2.663 s (18.4%)
iast_GLOBAL	17.085 s [17.085 s, 17.085 s]	2.586 s (17.8%)
profiling	14.214 s [14.214 s, 14.214 s]	-285.0 ms (-2.0%)
tracing	14.23 s [14.23 s, 14.23 s]	-269.0 ms (-1.9%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	15.08 s [15.08 s, 15.08 s]	-
appsec	14.228 s [14.228 s, 14.228 s]	-852.0 ms (-5.6%)
iast	17.366 s [17.366 s, 17.366 s]	2.286 s (15.2%)
iast_GLOBAL	17.148 s [17.148 s, 17.148 s]	2.068 s (13.7%)
profiling	14.412 s [14.412 s, 14.412 s]	-668.0 ms (-4.4%)
tracing	14.298 s [14.298 s, 14.298 s]	-782.0 ms (-5.2%)

These benchmarks exist to show why the APIs are forbidden

jbachorik · 2026-02-23T22:46:46Z

internal-api/src/jmh/java/datadog/trace/util/StringReplacementBenchmark.java

+ * StringReplacementBenchmark.string_replaceAll                      thrpt    6  14611046.391 ± 4865682.875   ops/s
+ * StringReplacementBenchmark.string_replaceAll:gc.alloc.rate        thrpt    6     11391.346 ±    3790.917  MB/sec
+ *


Can you add also String.replace(CharSequence, CharSequence) for completeness?

Good catch. I'd overlooked that replace actually does a replace all, so I didn't realize it was equivalent.

To my surprise, the Strings.replaceAll that I implemented is actually still 20% faster than String.replace.

…race-java into dougqh/strings-improvements

dougqh requested a review from a team as a code owner February 19, 2026 15:38

dougqh requested a review from manuel-alvarez-alvarez February 19, 2026 15:38

dougqh added type: enhancement Enhancements and improvements comp: core Tracer core tag: performance Performance related changes labels Feb 19, 2026

dougqh added 7 commits February 19, 2026 10:39

Checking hashCode

b0a04fc

Reducing whitespace

f75da1c

Fixing ugly spotless formatting

ab70701

Fixing ugly spotless formatting

fb3ae00

Renaming benchmark method

a71b449

Clarifying Javadoc

aa070b4

grammar

fa1b8bd

dougqh changed the title ~~Adding lighter String processing methods to StringUtiils~~ Adding lighter String processing methods to Strings Feb 19, 2026

dougqh added 2 commits February 23, 2026 15:44

Allowing forbidden API usage

2822711

These benchmarks exist to show why the APIs are forbidden

Merge branch 'master' into dougqh/strings-improvements

6f9ca53

jbachorik reviewed Feb 23, 2026

View reviewed changes

dougqh added 9 commits February 24, 2026 09:01

Merge branch 'master' into dougqh/strings-improvements

d6623eb

Adding String.replace to the benchmark

1beb704

grammar

f516f32

Added comment explaining implementation approach

a149be6

Clean-up imports

479a3e0

spotless

c03a85a

Merge branch 'master' into dougqh/strings-improvements

018496b

Fixing package after moving code from stand-alone reproduction

0bfdbd4

Merge branch 'dougqh/strings-improvements' of github.com:DataDog/dd-t…

80b454c

…race-java into dougqh/strings-improvements

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Adding lighter String processing methods to Strings#10640

Adding lighter String processing methods to Strings#10640
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