diff options
| author | Paul Buetow <paul@buetow.org> | 2025-07-04 11:25:17 +0300 |
|---|---|---|
| committer | Paul Buetow <paul@buetow.org> | 2025-07-04 11:25:17 +0300 |
| commit | 0645644bb945c4ce4707252c38a8d454b2ac9567 (patch) | |
| tree | aaff70f07cb07b85cbdcb53faf35c13ca40292ef /performance_optimization_summary.md | |
| parent | aa2f547cf2b6136dc60f541f30c27a426ec7c6c8 (diff) | |
chore: clean up temporary files and reorganize documentation
- Delete temporary benchmark shell scripts (7 files)
- Delete temporary log files from root and integrationtests
- Delete .out test output files
- Delete temporary Python analysis scripts
- Move documentation to doc/ directory:
- TURBOBOOST_OPTIMIZATION.md → doc/turboboost_optimization.md
- performance_optimization_summary.md → doc/performance_optimization_summary.md
- integrationtests/REFACTORING_GUIDE.md → doc/refactoring_guide.md
- benchmarks/PROFILING.md → doc/profiling.md
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
Diffstat (limited to 'performance_optimization_summary.md')
| -rw-r--r-- | performance_optimization_summary.md | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/performance_optimization_summary.md b/performance_optimization_summary.md deleted file mode 100644 index 9d1162b..0000000 --- a/performance_optimization_summary.md +++ /dev/null @@ -1,62 +0,0 @@ -# DTail Performance Optimization Summary - -## Changes Made - -### 1. Optimized Trace Logging (`/internal/io/dlog/dlog.go`) - -**Problem**: The `Trace()` and `Devel()` functions were calling `runtime.Caller(1)` for every invocation, even when trace logging was disabled. This was causing ~497ns overhead per call. - -**Solution**: Added early level checks before the expensive `runtime.Caller()` operation: - -```go -func (d *DLog) Trace(args ...interface{}) string { - // Early check to avoid expensive runtime.Caller when trace is disabled - if d.maxLevel < Trace { - return "" - } - // ... rest of function -} -``` - -### 2. Improved Buffering in Turbo Mode (`/internal/server/handlers/turbo_writer.go`) - -**Problem**: Turbo mode was forcing immediate flush after every line in serverless mode, defeating the purpose of buffering. - -**Solution**: Removed the immediate flush condition for serverless mode, allowing proper buffering: - -```go -// Changed from: -if w.writeBuf.Len() >= w.bufSize || w.serverless { - return w.flushBuffer() -} - -// To: -if w.writeBuf.Len() >= w.bufSize { - return w.flushBuffer() -} -``` - -## Performance Results - -### Before Optimization -- Turbo mode was **3-5x slower** than non-turbo mode -- DCat (10MB): 678ms (turbo) vs 210ms (non-turbo) -- DGrep (10MB): 570ms (turbo) vs 96ms (non-turbo) - -### After Optimization -- Turbo mode is now **2.87x faster** than non-turbo mode -- DCat (1M lines): 0.66s (turbo) vs 1.89s (non-turbo) - **65% improvement** -- DCat with colors: 1.69s (turbo) vs 2.24s (non-turbo) - **24% improvement** - -## Verification -- ✅ All unit tests pass -- ✅ All integration tests pass -- ✅ No functionality regression -- ✅ Backward compatible - -## Files Modified -1. `/internal/io/dlog/dlog.go` - Lines 196-216 -2. `/internal/server/handlers/turbo_writer.go` - Lines 104-108 - -## Key Takeaway -The trace logging overhead was the primary bottleneck, causing DTail to spend more time logging than processing data. By adding simple level checks before expensive operations, we achieved a ~3x performance improvement in turbo mode.
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