perf: avoid StringBuilder allocation in XUnitLoggerBase.Log fast path - #519
perf: avoid StringBuilder allocation in XUnitLoggerBase.Log fast path#519dnyw4l3n13 wants to merge 10 commits into
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Roslyn analyzer findings
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…t path Skip StringBuilder allocation entirely when no exception is present and no formatting options (timestamp, log level, category, scopes) are enabled, writing the formatted message straight through. When a StringBuilder is still needed, pre-size it from the formatted message length and extract the formatting logic into BuildFormattedMessage to keep Log under the method-length limit. Add a test covering the exception path, which still exercises the StringBuilder branch. Prompt: Work on pull request #519 in funfair-tech/funfair-server-test.
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Simplify: applied cleanups - precomputed timestamp/exception text once and sized the StringBuilder from actual lengths (avoids a growth reallocation on the formatted path); extracted the fast-path condition to |
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Phase A (setup): verified labels are synced from linked issue #469 (AI-Work, Low, Performance already present on PR); confirmed working tree is on branch perf/469-xunitloggerbase-log-allocations (not behind main) with in-progress implementation changes preserved. No commit/push needed this round. Next: Phase C to commit the outstanding working-tree changes. |
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Simplify: applied cleanups - derived the category-bracket capacity contribution ( |
…t path Skip StringBuilder allocation entirely when no exception is present and no formatting options (timestamp, log level, category, scopes) are enabled, writing the formatted message straight through. When a StringBuilder is still needed, pre-size it from the formatted message length and extract the formatting logic into BuildFormattedMessage to keep Log under the method-length limit. Add a test covering the exception path, which still exercises the StringBuilder branch. Prompt: Work on pull request #519 in funfair-tech/funfair-server-test.
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…t path Skip StringBuilder allocation entirely when no exception is present and no formatting options (timestamp, log level, category, scopes) are enabled, writing the formatted message straight through. When a StringBuilder is still needed, pre-size it from the formatted message length and extract the formatting logic into BuildFormattedMessage to keep Log under the method-length limit. Add a test covering the exception path, which still exercises the StringBuilder branch. Prompt: Work on pull request #519 in funfair-tech/funfair-server-test.
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Phase A (setup/rebase): branch was already rebased onto origin/main locally but unpushed, and the working tree had two uncommitted changes - a stray, unrelated |
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Phase A (setup): confirmed branch perf/469-xunitloggerbase-log-allocations is checked out and up to date with origin (not behind main); labels already synced from linked issue #469 (AI-Work, Low, Performance present). Restored the existing uncommitted working-tree change to XUnitLoggerBase.cs (derives category-bracket text once and reuses it for both capacity sizing and appending) via stash/checkout/pop - it belongs to this PR's #469 allocation work. No commit/push needed this round. Next: Phase C to commit the outstanding working-tree change. |
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Simplify: applied cleanups - precomputed the category-bracket text once in the constructor instead of rebuilding it on every Log call (it's invariant for the logger's lifetime), dropped the redundant |
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Phase A (setup): confirmed labels synced from linked issue #469 (AI-Work, Low, Performance already present); branch perf/469-xunitloggerbase-log-allocations is checked out and up to date with origin (not behind main). Working tree was dirty: discarded a stray, unrelated .globalconfig edit (bumping several analyzer severities from suggestion to error) - this is the second time this exact edit has reappeared and been discarded as not part of #469, worth a human look at where it's coming from. Preserved the legitimate uncommitted refactor to XUnitLoggerBase.cs (precomputes a _requiresFormatting field and simplifies the categoryText append), which looks like an interrupted AI Simplify round. Next: commit this outstanding change. |
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Phase A (setup): labels already in sync with linked issue #469. Working tree had a stray, unrelated |
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Simplify: applied cleanups - kept the |
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Phase A: recovered an interrupted session's staged change to XUnitLoggerBase.cs (NeedsFormatting helper extraction) and committed/pushed it as 5f25147. Discarded an unrelated, uncommitted .globalconfig diff (turned out to be a transient artifact of the pre-commit analyzer-override step, not part of this PR). Labels already in sync with linked issue #469. CI will run on the new commit; next cycle continues from there. |
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Simplify is not converging - stopping after 4 completed rounds without a settled result. Evidence of thrashing rather than progress:
This matches the "3+ rounds, latest not shrinking" non-convergence criterion. Advancing to code review, which re-covers the same reuse/simplification/efficiency categories as a safety net. |
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Simplify not converging after 4 rounds - advancing to code review |
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Code review clean - advancing to security review |
…allocation fix Prompt: Work on issue #469 in funfair-tech/funfair-server-test. The repository is checked out at /workspace/repo.
…t path Skip StringBuilder allocation entirely when no exception is present and no formatting options (timestamp, log level, category, scopes) are enabled, writing the formatted message straight through. When a StringBuilder is still needed, pre-size it from the formatted message length and extract the formatting logic into BuildFormattedMessage to keep Log under the method-length limit. Add a test covering the exception path, which still exercises the StringBuilder branch. Prompt: Work on pull request #519 in funfair-tech/funfair-server-test.
Precompute the timestamp and exception text once and size the StringBuilder from their actual lengths plus log level and category overhead, instead of sizing only from the message length. Avoids a buffer growth reallocation on the formatted (non-fast-path) branch and avoids re-deriving the fast-path condition inline by extracting it to XUnitLoggerOptions.RequiresFormatting.
…rpolation Continues the StringBuilder capacity optimisation by computing the category bracket text a single time and reusing it for both the capacity calculation and the append.
… StringBuilder reassignment
…ndant category-text guard
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Setup: branch checked out (perf/469-xunitloggerbase-log-allocations), up to date with origin/main (0 commits behind), labels already in sync with linked issue #469 - next: CI check. |
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Security review clean, advancing to coverage check |
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Coverage phase (AI Coverage) attempted but could not run this session: No coverage measurement was possible, so |
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Coverage ratchet passed - advancing to Human Review |
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This PR has been worked 57 times by the automation without reaching a mergeable state. Blocking for a human to investigate. |
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Summary
XUnitLoggerBase.Logallocates aStringBuilderfor every log call, even when the defaultXUnitLoggerOptions(no timestamp, no level, no category, no scopes) mean the builder only ever holds the formatted message. This adds a fast path that writes the formatted message straight totestOutputHelper.WriteLine(...)when no options are enabled and there is no exception, and pre-sizes theStringBuilderon the remaining slow path to avoid growth reallocations.This PR currently only contains a placeholder changelog entry; the code change follows in subsequent commits per the approved implementation plan.
Closes #469