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fix(benchmarks): fix three parsing bugs in parse_results.go and bench_test.go

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- parse_results.go: fix metric extraction order — Go outputs custom metrics
  (p50_µs, p95_µs, p99_µs, req/s) BEFORE B/op and allocs/op on the benchmark
  line. The old positional regex had B/op first, so p50/p95/p99 were always
  empty in latency_report.csv. Replaced with separate regexps for each field
  so order no longer matters.

- parse_results.go: remove p95_latency_ms column from throughput_report.csv —
  parallel sweep files only emit ns/op and req/s, never p95 data. The column
  was structurally always empty.

- bench_test.go: remove fmt.Printf from BenchmarkBAPCaller_RPS — the debug
  print raced with Go's own benchmark output line, garbling the result to
  'BenchmarkRPS-N  RPS: N over Ns' which the framework could not parse,
  causing req/s to never appear in the structured output. b.ReportMetric
  alone is sufficient.
This commit is contained in:
Mayuresh
2026-04-09 17:01:13 +05:30
parent 1a6acfc260
commit 23e39722d2
2 changed files with 46 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
benchmarks/e2e/bench_test.go
View File

@@ -1,7 +1,6 @@
package e2e_bench_test
import (
"fmt"
"net/http"
"sort"
"testing"
@@ -162,9 +161,7 @@ func BenchmarkBAPCaller_RPS(b *testing.B) {
elapsed := time.Since(start).Seconds()
if elapsed > 0 {
rps := float64(count) / elapsed
b.ReportMetric(rps, "req/s")
fmt.Printf(" RPS: %.0f over %.1fs\n", rps, elapsed)
b.ReportMetric(float64(count)/elapsed, "req/s")
}
}

92
benchmarks/tools/parse_results.go
View File

@@ -10,7 +10,7 @@
// Output files:
//
// latency_report.csv — per-benchmark mean, p50, p95, p99 latency, allocs
// throughput_report.csv — RPS at each GOMAXPROCS level from the parallel sweep
// throughput_report.csv — RPS and mean latency at each GOMAXPROCS level from the parallel sweep
package main
import (
@@ -26,19 +26,19 @@ import (
)
var (
// Matches standard go bench output:
// BenchmarkFoo-8 1000 1234567 ns/op 1234 B/op 56 allocs/op
benchLineRe = regexp.MustCompile(
`^(Benchmark\S+)\s+\d+\s+([\d.]+)\s+ns/op` +
`(?:\s+([\d.]+)\s+B/op)?` +
`(?:\s+([\d.]+)\s+allocs/op)?` +
`(?:\s+([\d.]+)\s+p50_µs)?` +
`(?:\s+([\d.]+)\s+p95_µs)?` +
`(?:\s+([\d.]+)\s+p99_µs)?` +
`(?:\s+([\d.]+)\s+req/s)?`,
)
// Matches the benchmark name and ns/op from a standard go test -bench output line.
// Go outputs custom metrics (p50_µs, req/s, …) BEFORE B/op and allocs/op, so we
// extract those fields with dedicated regexps rather than relying on positional groups.
//
// Example lines:
// BenchmarkBAPCaller_Discover-10 73542 164193 ns/op 82913 B/op 662 allocs/op
// BenchmarkBAPCaller_Discover_Percentiles-10 72849 164518 ns/op 130.0 p50_µs 144.0 p95_µs 317.0 p99_µs 82528 B/op 660 allocs/op
// BenchmarkBAPCaller_RPS-4 700465 73466 ns/op 14356.0 req/s 80375 B/op 660 allocs/op
benchLineRe = regexp.MustCompile(`^(Benchmark\S+)\s+\d+\s+([\d.]+)\s+ns/op`)
bytesRe = regexp.MustCompile(`([\d.]+)\s+B/op`)
allocsRe = regexp.MustCompile(`([\d.]+)\s+allocs/op`)
// Matches custom metric lines in percentile output.
// Extracts any custom metric value from a benchmark line.
metricRe = regexp.MustCompile(`([\d.]+)\s+(p50_µs|p95_µs|p99_µs|req/s)`)
)
@@ -124,48 +124,43 @@ func parseRunFile(path string) ([]benchResult, error) {
defer f.Close()
var results []benchResult
currentBench := ""
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
// Main benchmark line.
if m := benchLineRe.FindStringSubmatch(line); m != nil {
r := benchResult{name: stripCPUSuffix(m[1])}
r.nsPerOp = parseFloat(m[2])
r.bytesOp = parseFloat(m[3])
r.allocsOp = parseFloat(m[4])
r.p50 = parseFloat(m[5])
r.p95 = parseFloat(m[6])
r.p99 = parseFloat(m[7])
r.rps = parseFloat(m[8])
results = append(results, r)
currentBench = r.name
m := benchLineRe.FindStringSubmatch(line)
if m == nil {
continue
}
// Custom metric lines (e.g., "123.4 p50_µs").
if currentBench != "" {
for _, mm := range metricRe.FindAllStringSubmatch(line, -1) {
val := parseFloat(mm[1])
metric := mm[2]
for i := range results {
if results[i].name == currentBench {
switch metric {
case "p50_µs":
results[i].p50 = val
case "p95_µs":
results[i].p95 = val
case "p99_µs":
results[i].p99 = val
case "req/s":
results[i].rps = val
}
}
}
r := benchResult{name: stripCPUSuffix(m[1])}
r.nsPerOp = parseFloat(m[2])
// B/op and allocs/op — extracted independently because Go places custom
// metrics (p50_µs, req/s, …) between ns/op and B/op on the same line.
if bm := bytesRe.FindStringSubmatch(line); bm != nil {
r.bytesOp = parseFloat(bm[1])
}
if am := allocsRe.FindStringSubmatch(line); am != nil {
r.allocsOp = parseFloat(am[1])
}
// Custom metrics — scan the whole line regardless of position.
for _, mm := range metricRe.FindAllStringSubmatch(line, -1) {
switch mm[2] {
case "p50_µs":
r.p50 = parseFloat(mm[1])
case "p95_µs":
r.p95 = parseFloat(mm[1])
case "p99_µs":
r.p99 = parseFloat(mm[1])
case "req/s":
r.rps = parseFloat(mm[1])
}
}
results = append(results, r)
}
return results, scanner.Err()
}
@@ -212,7 +207,11 @@ func writeThroughputCSV(path string, rows []cpuResult) error {
w := csv.NewWriter(f)
defer w.Flush()
header := []string{"gomaxprocs", "benchmark", "rps", "mean_latency_ms", "p95_latency_ms"}
// p95 latency is not available from the parallel sweep files — those benchmarks
// only emit ns/op and req/s. p95 data comes exclusively from
// BenchmarkBAPCaller_Discover_Percentiles, which runs at a single GOMAXPROCS
// setting and is not part of the concurrency sweep.
header := []string{"gomaxprocs", "benchmark", "rps", "mean_latency_ms"}
if err := w.Write(header); err != nil {
return err
}
@@ -223,7 +222,6 @@ func writeThroughputCSV(path string, rows []cpuResult) error {
row.res.name,
fmtFloat(row.res.rps),
fmtFloat(row.res.nsPerOp / 1e6),
fmtFloat(row.res.p95),
}
if err := w.Write(r); err != nil {
return err