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|
package export
import (
"encoding/csv"
"errors"
"fmt"
"os"
"time"
"ior/internal/statsengine"
)
// SnapshotCSV writes a dashboard snapshot to a timestamped CSV file.
func SnapshotCSV(snap *statsengine.Snapshot) (filename string, retErr error) {
filename = fmt.Sprintf("ior-snapshot-%s.csv", time.Now().Format("20060102-150405"))
f, err := os.Create(filename)
if err != nil {
return "", err
}
defer func() {
if err := f.Close(); err != nil {
retErr = errors.Join(retErr, fmt.Errorf("close %s: %w", filename, err))
}
}()
w := csv.NewWriter(f)
if err := writeSnapshotRows(w, snap); err != nil {
return "", err
}
w.Flush()
if err := w.Error(); err != nil {
return "", err
}
return filename, nil
}
// writeSnapshotRows writes all CSV sections to w in order:
// header, summary, per-syscall stats, file stats, process stats, histograms.
func writeSnapshotRows(w *csv.Writer, snap *statsengine.Snapshot) error {
summaryRows := [][]string{
{"section", "name", "value1", "value2", "value3"},
{"summary", "totals",
fmt.Sprint(snapValue(snap, func(s *statsengine.Snapshot) uint64 { return s.TotalSyscalls })),
fmt.Sprint(snapValue(snap, func(s *statsengine.Snapshot) uint64 { return s.TotalErrors })),
fmt.Sprint(snapValue(snap, func(s *statsengine.Snapshot) uint64 { return s.TotalBytes }))},
{"summary", "rates_per_sec",
fmt.Sprintf("%.2f", snapValueF(snap, func(s *statsengine.Snapshot) float64 { return s.SyscallRatePerSec })),
fmt.Sprintf("%.2f", snapValueF(snap, func(s *statsengine.Snapshot) float64 { return s.ReadBytesPerSec })),
fmt.Sprintf("%.2f", snapValueF(snap, func(s *statsengine.Snapshot) float64 { return s.WriteBytesPerSec }))},
{"summary", "latency_gap_mean_ns",
fmt.Sprintf("%.2f", snapValueF(snap, func(s *statsengine.Snapshot) float64 { return s.LatencyMeanNs })),
fmt.Sprintf("%.2f", snapValueF(snap, func(s *statsengine.Snapshot) float64 { return s.GapMeanNs })), ""},
{"summary", "trend",
trendSummary(snap, func(s *statsengine.Snapshot) statsengine.Trend { return s.LatencyTrend }),
trendSummary(snap, func(s *statsengine.Snapshot) statsengine.Trend { return s.GapTrend }),
trendSummary(snap, func(s *statsengine.Snapshot) statsengine.Trend { return s.ThroughputTrend })},
}
for _, row := range summaryRows {
if err := w.Write(row); err != nil {
return err
}
}
if snap == nil {
return nil
}
return writeSnapshotDetailRows(w, snap)
}
// writeSnapshotDetailRows writes per-item rows for syscalls, files, processes,
// and histograms. It is called only when snap is non-nil.
func writeSnapshotDetailRows(w *csv.Writer, snap *statsengine.Snapshot) error {
for _, s := range snap.Syscalls() {
if err := w.Write([]string{"syscall", s.Name, fmt.Sprint(s.Count), fmt.Sprintf("%.2f", s.RatePerSec), fmt.Sprint(s.Bytes)}); err != nil {
return err
}
if err := w.Write([]string{"syscall_latency_ns", s.Name, fmt.Sprintf("%.2f", s.LatencyMeanNs), fmt.Sprint(s.LatencyMinNs), fmt.Sprint(s.LatencyMaxNs)}); err != nil {
return err
}
if err := w.Write([]string{"syscall_percentiles_ns", s.Name, fmt.Sprint(s.LatencyP50Ns), fmt.Sprint(s.LatencyP95Ns), fmt.Sprint(s.LatencyP99Ns)}); err != nil {
return err
}
}
for _, r := range snap.Files() {
if err := w.Write([]string{"file", r.Path, fmt.Sprint(r.Accesses), fmt.Sprint(r.BytesRead), fmt.Sprint(r.BytesWritten)}); err != nil {
return err
}
if err := w.Write([]string{"file_latency_ns", r.Path, fmt.Sprintf("%.2f", r.AvgLatencyNs), fmt.Sprint(r.MaxLatencyNs), ""}); err != nil {
return err
}
}
for _, p := range snap.Processes() {
if err := w.Write([]string{"process", fmt.Sprint(p.PID), fmt.Sprint(p.Syscalls), fmt.Sprintf("%.2f", p.RatePerSec), fmt.Sprint(p.Bytes)}); err != nil {
return err
}
if err := w.Write([]string{"process_latency_ns", fmt.Sprint(p.PID), fmt.Sprintf("%.2f", p.AvgLatencyNs), "", ""}); err != nil {
return err
}
}
for _, b := range snap.LatencyHistogram.Buckets() {
if err := w.Write([]string{"latency_hist", b.Label, fmt.Sprint(b.Count), fmt.Sprint(b.LowerNs), fmt.Sprint(b.UpperNs)}); err != nil {
return err
}
}
for _, b := range snap.GapHistogram.Buckets() {
if err := w.Write([]string{"gap_hist", b.Label, fmt.Sprint(b.Count), fmt.Sprint(b.LowerNs), fmt.Sprint(b.UpperNs)}); err != nil {
return err
}
}
return nil
}
func snapValue(snap *statsengine.Snapshot, get func(*statsengine.Snapshot) uint64) uint64 {
if snap == nil {
return 0
}
return get(snap)
}
func snapValueF(snap *statsengine.Snapshot, get func(*statsengine.Snapshot) float64) float64 {
if snap == nil {
return 0
}
return get(snap)
}
func trendSummary(snap *statsengine.Snapshot, get func(*statsengine.Snapshot) statsengine.Trend) string {
if snap == nil {
return "stable:0.00"
}
trend := get(snap)
return fmt.Sprintf("%s:%.2f", trend.Direction, trend.DeltaPercent)
}
|
