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// Copyright 2019 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"flag"
"log"
"os"
"github.com/google/pprof/profile"
)
var (
output string
)
func main() {
flag.StringVar(&output, "o", "merged.data", "")
flag.Parse()
files := os.Args[1:]
if len(files) == 0 {
log.Fatal("Give profiles files as arguments")
}
var profiles []*profile.Profile
for _, fname := range files {
f, err := os.Open(fname)
if err != nil {
log.Fatalf("Cannot open profile file at %q: %v", fname, err)
}
p, err := profile.Parse(f)
if err != nil {
log.Fatalf("Cannot parse profile at %q: %v", fname, err)
}
profiles = append(profiles, p)
}
merged, err := profile.Merge(profiles)
if err != nil {
log.Fatalf("Cannot merge profiles: %v", err)
}
out, err := os.OpenFile(output, os.O_RDWR|os.O_CREATE, 0755)
if err != nil {
log.Fatalf("Cannot open output to write: %v", err)
}
if err := merged.Write(out); err != nil {
log.Fatalf("Cannot write merged profile to file: %v", err)
}
if err := out.Close(); err != nil {
log.Printf("Error when closing the output file: %v", err)
}
}
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