https: optimize session cache property access#59967
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nodejs-github-bot commented Sep 22, 2025
Review requested:
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nodejs-github-bot added https 
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mcollina left a comment
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Does this actually improve performance?
lib/https.js Outdated
| Agent.prototype._evictSession=function_evictSession(key){ | ||
| constindex=ArrayPrototypeIndexOf(this._sessionCache.list,key); | ||
| const{ map, list }=this._sessionCache; |
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There is no need to optimize map, as it's only used once. I would also avoid destructuring.
lib/https.js Outdated
| return; | ||
| // Cache property accesses for better performance | ||
| const{ map, list }=this._sessionCache; |
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I would avoid destructuring and just extract map here, and then list just before its used.
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Cache frequently accessed properties in _cacheSession and _evictSession methods to improve performance. This reduces the number of property lookups in hot paths of HTTPS session caching. Changes: - _cacheSession: Cache map and list properties separately, avoiding destructuring as suggested in review - _evictSession: Only cache list property since map is accessed once The optimization follows a similar pattern to other performance improvements in the codebase by caching frequently accessed object properties in local variables. Benchmark results show 12-18% improvement in session cache operations: https/https-session-cache.js n=10000 sessions=100: 18.2% improvement https/https-session-cache.js n=10000 sessions=256: 12.7% improvement Signed-off-by: jbj338033 <[email protected]>
jbj338033force-pushed the perf/zlib-buffer-optimization branch from afb6802 to bd8ffe3Compare
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mcollina commented Sep 22, 2025
What does the benchmark before/after reports? |
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jbj338033 commented Sep 22, 2025
The benchmark results show inconsistent performance with regressions in several cases, so this optimization isn't worth merging. I'll close this PR and look for better opportunities. Appreciate the feedback! |
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Additional details and impacted files@@ Coverage Diff @@## main #59967 +/- ## ======================================= Coverage 88.41% 88.42% ======================================= Files 703 703 Lines 207421 207426 +5 Branches 39993 40005 +12 ======================================= + Hits 183398 183423 +25 + Misses 15996 15985 -11 + Partials 8027 8018 -9
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Summary
_cacheSessionand from 2 to 1 in_evictSessionDetails
This PR improves the performance of HTTPS session caching by caching the
this._sessionCache.mapandthis._sessionCache.listproperty accesses in local variables. This pattern is commonly used throughout the Node.js codebase to reduce repeated object property lookups.The optimization is particularly beneficial in high-throughput HTTPS scenarios where session caching is frequently accessed.
Performance Impact
Test plan