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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"os"
"sort"
"strconv"
"strings"
)
type info struct {
stackTrace string
size int
}
const (
prefix = "malloc size:"
suffix = ", stack:"
)
func readFile(path string) ([]info, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
merge := make(map[string]int, 1024*1024)
scanner := bufio.NewScanner(file)
var mallocSize int
var stackTrace strings.Builder
for scanner.Scan() {
line := scanner.Text()
if start := strings.Index(line, prefix); start != -1 {
start += len(prefix)
end := strings.Index(line[start:], suffix)
if end >= 0 {
numStr := line[start : start+end]
size, err := strconv.Atoi(numStr)
if err == nil {
mallocSize = size
}
}
} else if len(line) > 0 {
stackTrace.WriteString(line)
stackTrace.WriteString("\n")
} else {
if mallocSize > 0 {
merge[stackTrace.String()] += mallocSize
}
mallocSize = 0
stackTrace.Reset()
}
}
if mallocSize > 0 {
merge[stackTrace.String()] += mallocSize
}
sorted := make([]info, 0, len(merge))
for k, v := range merge {
sorted = append(sorted, info{stackTrace: k, size: v})
}
sort.Slice(sorted, func(i, j int) bool {
return sorted[i].size > sorted[j].size
})
return sorted, nil
}
func main() {
if len(os.Args) <= 1 {
fmt.Println("usage: trace-malloc-output-merge file")
return
}
sorted, err := readFile(os.Args[1])
if err != nil {
fmt.Println(err)
return
}
file, err := os.Create(os.Args[2])
if err != nil {
fmt.Println("Failed to create file!")
return
}
defer file.Close()
writer := bufio.NewWriter(file)
for _, kv := range sorted {
fmt.Fprintf(writer, "%s%d%s\n%s\n\n", prefix, kv.size, suffix, kv.stackTrace)
}
writer.Flush()
}