perf(tracer): build runtime strings directly by BridgeAR · Pull Request #10089 · DataDog/dd-trace-js

BridgeAR · 2026-08-31T21:30:02Z

Direct concatenation reduced one-block formatting from 22.4–22.6 ns to 5.0 ns. Three-block formatting dropped from 46.4–47.6 ns to 12.6–12.9 ns.

The benchmark used Node 22.20.0 / V8 12.4, one million iterations, and seven trials with the best and worst removed.

Caller-provided AMQP link names without an underscore previously produced an empty short name, which dropped the link name from the span resource.

dd-octo-sts · 2026-08-31T21:30:54Z

Overall package size

Self size: 8.64 MB
Deduped: 9.3 MB
No deduping: 9.3 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.4.0 | 127.33 kB | 447.04 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | dc-polyfill | 0.1.11 | 25.74 kB | 25.74 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

datadog-prod-us1-6 · 2026-08-31T21:33:40Z

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 98.63% (+0.00%)

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: 0236535 | Docs | View more details | Give us feedback!}

pr-commenter · 2026-08-31T21:44:12Z

Benchmarks

Benchmark execution time: 2026-09-01 09:32:10

Comparing candidate commit 0236535 in PR branch BridgeAR/2026-08-31-direct-strings-runtime with baseline commit 15c6e71 in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 2290 metrics, 20 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

🟩 = significantly better candidate vs. baseline
🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

Unstable benchmarks

These benchmarks have a confidence interval too wide to call a change; treat them as noise rather than signal.

scenario:appsec-appsec-enabled-20

unstable max_rss_usage [-25.061MB; +46.900MB] or [-13.782%; +25.791%]

scenario:debugger-line-probe-with-snapshot-minimal-24

unstable max_rss_usage [-11.046MB; +18.836MB] or [-4.547%; +7.753%]

scenario:dogstatsd-with-tags-20

unstable cpu_user_time [-464.116ms; +234.081ms] or [-9.430%; +4.756%]
unstable execution_time [-466.668ms; +227.457ms] or [-9.325%; +4.545%]
unstable throughput [-75404.845op/s; +155283.153op/s] or [-4.494%; +9.254%]

scenario:id-parse-128bit-20

unstable execution_time [-104.041ms; +168.155ms] or [-3.850%; +6.222%]

scenario:plugin-cassandra-driver-batch-20

unstable cpu_user_time [-435.489ms; -180.074ms] or [-18.387%; -7.603%]
unstable execution_time [-441.139ms; -181.885ms] or [-18.570%; -7.657%]
unstable instructions [-4.5G instructions; -1.9G instructions] or [-17.321%; -7.271%]
unstable throughput [+65650.725op/s; +160944.225op/s] or [+7.636%; +18.720%]

scenario:plugin-cassandra-driver-batch-24

unstable cpu_user_time [-477.575ms; -198.194ms] or [-19.017%; -7.892%]
unstable execution_time [-476.099ms; -196.434ms] or [-18.877%; -7.789%]
unstable instructions [-4.5G instructions; -1.9G instructions] or [-17.446%; -7.323%]
unstable throughput [+62932.570op/s; +153963.201op/s] or [+7.767%; +19.001%]

scenario:plugin-cassandra-driver-batch-26

unstable cpu_user_time [-473.069ms; -193.411ms] or [-20.557%; -8.405%]
unstable execution_time [-490.251ms; -201.400ms] or [-20.774%; -8.534%]
unstable instructions [-4.7G instructions; -2.0G instructions] or [-17.834%; -7.486%]
unstable throughput [+73947.734op/s; +181720.100op/s] or [+8.505%; +20.900%]

scenario:plugin-graphql-long-with-depth-on-max-20

unstable max_rss_usage [-7027.871KB; +7637.071KB] or [-4.933%; +5.360%]

scenario:test-optimization-large-suite-20

unstable max_rss_usage [-7.083MB; +4.547MB] or [-8.692%; +5.580%]

codecov · 2026-08-31T21:48:37Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.62%. Comparing base (15c6e71) to head (0236535).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #10089    +/-   ##
========================================
  Coverage   98.62%   98.62%            
========================================
  Files         996      996            
  Lines      152043   152050     +7     
  Branches    13207    12945   -262     
========================================
+ Hits       149956   149963     +7     
  Misses       2087     2087

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Direct concatenation reduced one-block formatting from 22.4–22.6 ns to 5.0 ns and three-block formatting from 46.4–47.6 ns to 12.6–12.9 ns. The benchmark used Node 22.20.0 / V8 12.4, one million iterations, and seven trials with the best and worst removed. AMQP link names without an underscore previously produced an empty short name, which dropped the link name from the span resource.

BridgeAR added the semver-patch label Aug 31, 2026

BridgeAR marked this pull request as ready for review September 1, 2026 08:58

BridgeAR requested review from a team as code owners September 1, 2026 08:59

BridgeAR requested review from khanayan123 and tlhunter and removed request for a team September 1, 2026 08:59

chatgpt-codex-connector Bot reviewed Sep 1, 2026

View reviewed changes

Comment thread packages/dd-trace/src/appsec/iast/telemetry/span-tags.js

BridgeAR marked this pull request as draft September 1, 2026 09:14

BridgeAR added 2 commits September 1, 2026 11:16

chore(instrumentations): remove stale rewriter TODO

0236535

BridgeAR changed the base branch from BridgeAR/2026-08-31-direct-strings-ai to master September 1, 2026 09:21

BridgeAR force-pushed the BridgeAR/2026-08-31-direct-strings-runtime branch from 863f593 to 0236535 Compare September 1, 2026 09:22

BridgeAR marked this pull request as ready for review September 1, 2026 09:25

sabrenner approved these changes Sep 1, 2026

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BridgeAR merged commit ae57e03 into master Sep 1, 2026
934 of 936 checks passed

BridgeAR deleted the BridgeAR/2026-08-31-direct-strings-runtime branch September 1, 2026 14:09

dd-octo-sts Bot mentioned this pull request Sep 2, 2026

v5.125.0 proposal #10067

Merged

dd-octo-sts Bot mentioned this pull request Sep 2, 2026

v6.14.0 proposal #10068

Merged

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perf(tracer): build runtime strings directly - #10089

perf(tracer): build runtime strings directly#10089
BridgeAR merged 2 commits into
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Explanation

More details about the CI and significant changes

Unstable benchmarks

scenario:appsec-appsec-enabled-20

scenario:debugger-line-probe-with-snapshot-minimal-24

scenario:dogstatsd-with-tags-20

scenario:id-parse-128bit-20

scenario:plugin-cassandra-driver-batch-20

scenario:plugin-cassandra-driver-batch-24

scenario:plugin-cassandra-driver-batch-26

scenario:plugin-graphql-long-with-depth-on-max-20

scenario:test-optimization-large-suite-20

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Unstable benchmarks

scenario:appsec-appsec-enabled-20

scenario:debugger-line-probe-with-snapshot-minimal-24

scenario:dogstatsd-with-tags-20

scenario:id-parse-128bit-20

scenario:plugin-cassandra-driver-batch-20

scenario:plugin-cassandra-driver-batch-24

scenario:plugin-cassandra-driver-batch-26

scenario:plugin-graphql-long-with-depth-on-max-20

scenario:test-optimization-large-suite-20

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