statsengine: cache syscall percentiles between snapshots

1 files changed, 29 insertions, 0 deletions

diff --git a/internal/statsengine/bench_test.go b/internal/statsengine/bench_test.go
new file mode 100644
index 0000000..27f17b1
--- /dev/null
+++ b/internal/statsengine/bench_test.go
@@ -0,0 +1,29 @@
+package statsengine
+
+import (
+	"ior/internal/types"
+	"math/rand"
+	"testing"
+	"time"
+)
+
+func BenchmarkSyscallAccumulatorSnapshot(b *testing.B) {
+	acc := newSyscallAccumulatorWithConfig(10_000, rand.New(rand.NewSource(123)))
+	traceIDs := []types.TraceId{
+		types.SYS_ENTER_READ,
+		types.SYS_ENTER_WRITE,
+		types.SYS_ENTER_OPENAT,
+		types.SYS_ENTER_CLOSE,
+		types.SYS_ENTER_COPY_FILE_RANGE,
+	}
+	for i := 0; i < 100_000; i++ {
+		id := traceIDs[i%len(traceIDs)]
+		acc.Add(newPair(id, uint64((i%2000)+1), uint64(i%65536), 0))
+	}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = acc.Snapshot(5 * time.Second)
+	}
+}