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package profiling
import (
"fmt"
"os"
"path/filepath"
"runtime"
"runtime/pprof"
"time"
"log"
)
// Profiler manages CPU and memory profiling for dtail commands
type Profiler struct {
cpuProfile *os.File
memProfile string
profileDir string
commandName string
enabled bool
}
// Config holds profiling configuration
type Config struct {
// Enable CPU profiling
CPUProfile bool
// Enable memory profiling
MemProfile bool
// Directory to store profiles
ProfileDir string
// Command name for profile naming
CommandName string
}
// NewProfiler creates a new profiler instance
func NewProfiler(cfg Config) *Profiler {
if !cfg.CPUProfile && !cfg.MemProfile {
return &Profiler{enabled: false}
}
p := &Profiler{
profileDir: cfg.ProfileDir,
commandName: cfg.CommandName,
enabled: true,
}
// Create profile directory if it doesn't exist
if p.profileDir == "" {
p.profileDir = "profiles"
}
if err := os.MkdirAll(p.profileDir, 0755); err != nil {
log.Printf("Failed to create profile directory: %v", err)
p.enabled = false
return p
}
// Start CPU profiling if enabled
if cfg.CPUProfile {
p.startCPUProfile()
}
// Set memory profile path if enabled
if cfg.MemProfile {
timestamp := time.Now().Format("20060102_150405")
p.memProfile = filepath.Join(p.profileDir, fmt.Sprintf("%s_mem_%s.prof", p.commandName, timestamp))
}
return p
}
// startCPUProfile starts CPU profiling
func (p *Profiler) startCPUProfile() {
timestamp := time.Now().Format("20060102_150405")
cpuProfilePath := filepath.Join(p.profileDir, fmt.Sprintf("%s_cpu_%s.prof", p.commandName, timestamp))
f, err := os.Create(cpuProfilePath)
if err != nil {
log.Printf("Failed to create CPU profile file: %v", err)
return
}
if err := pprof.StartCPUProfile(f); err != nil {
log.Printf("Failed to start CPU profile: %v", err)
f.Close()
return
}
p.cpuProfile = f
log.Printf("Started CPU profiling: %s", cpuProfilePath)
}
// Stop stops all profiling and writes profiles to disk
func (p *Profiler) Stop() {
if !p.enabled {
return
}
// Stop CPU profiling
if p.cpuProfile != nil {
pprof.StopCPUProfile()
p.cpuProfile.Close()
log.Printf("Stopped CPU profiling")
}
// Write memory profile
if p.memProfile != "" {
p.writeMemProfile()
}
}
// writeMemProfile writes memory allocation profile to disk
func (p *Profiler) writeMemProfile() {
f, err := os.Create(p.memProfile)
if err != nil {
log.Printf("Failed to create memory profile file: %v", err)
return
}
defer f.Close()
// Force GC before capturing memory profile for more accurate results
runtime.GC()
if err := pprof.WriteHeapProfile(f); err != nil {
log.Printf("Failed to write memory profile: %v", err)
return
}
log.Printf("Wrote memory profile: %s", p.memProfile)
// Also write allocation profile for detailed allocation tracking
allocProfilePath := filepath.Join(p.profileDir,
fmt.Sprintf("%s_alloc_%s.prof", p.commandName, time.Now().Format("20060102_150405")))
allocFile, err := os.Create(allocProfilePath)
if err != nil {
log.Printf("Failed to create allocation profile file: %v", err)
return
}
defer allocFile.Close()
// Set allocation profiling rate to capture more samples
runtime.MemProfileRate = 1
if err := pprof.Lookup("allocs").WriteTo(allocFile, 0); err != nil {
log.Printf("Failed to write allocation profile: %v", err)
return
}
log.Printf("Wrote allocation profile: %s", allocProfilePath)
}
// Snapshot takes a memory snapshot at any point during execution
func (p *Profiler) Snapshot(label string) {
if !p.enabled || p.memProfile == "" {
return
}
timestamp := time.Now().Format("20060102_150405")
snapshotPath := filepath.Join(p.profileDir,
fmt.Sprintf("%s_snapshot_%s_%s.prof", p.commandName, label, timestamp))
f, err := os.Create(snapshotPath)
if err != nil {
log.Printf("Failed to create snapshot file: %v", err)
return
}
defer f.Close()
runtime.GC()
if err := pprof.WriteHeapProfile(f); err != nil {
log.Printf("Failed to write snapshot: %v", err)
return
}
log.Printf("Wrote memory snapshot: %s (label: %s)", snapshotPath, label)
}
// ProfileMetrics captures and returns current runtime metrics
type ProfileMetrics struct {
// Memory statistics
Alloc uint64 // Bytes allocated and still in use
TotalAlloc uint64 // Bytes allocated (even if freed)
Sys uint64 // Bytes obtained from system
NumGC uint32 // Number of completed GC cycles
LastGC time.Time // Time of last GC
PauseTotalNs uint64 // Total GC pause time in nanoseconds
// Goroutine count
NumGoroutine int
// CPU count
NumCPU int
}
// GetMetrics returns current runtime metrics
func GetMetrics() ProfileMetrics {
var m runtime.MemStats
runtime.ReadMemStats(&m)
return ProfileMetrics{
Alloc: m.Alloc,
TotalAlloc: m.TotalAlloc,
Sys: m.Sys,
NumGC: m.NumGC,
LastGC: time.Unix(0, int64(m.LastGC)),
PauseTotalNs: m.PauseTotalNs,
NumGoroutine: runtime.NumGoroutine(),
NumCPU: runtime.NumCPU(),
}
}
// LogMetrics logs current runtime metrics
func (p *Profiler) LogMetrics(label string) {
if !p.enabled {
return
}
metrics := GetMetrics()
log.Printf("Profile metrics [%s]: alloc=%.2fMB total_alloc=%.2fMB sys=%.2fMB num_gc=%d gc_pause=%.2fms goroutines=%d",
label,
float64(metrics.Alloc)/1024/1024,
float64(metrics.TotalAlloc)/1024/1024,
float64(metrics.Sys)/1024/1024,
metrics.NumGC,
float64(metrics.PauseTotalNs)/1e6,
metrics.NumGoroutine)
}
|
