tzhash/cmd/tzsum/main.go

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package main
import (
"flag"
"fmt"
"hash"
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"io"
"log"
"os"
"runtime"
"runtime/pprof"
"github.com/nspcc-dev/tzhash/tz"
"golang.org/x/sys/cpu"
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)
var (
cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
memprofile = flag.String("memprofile", "", "write memory profile to `file`")
filename = flag.String("name", "-", "file to use")
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hashimpl = flag.String("impl", "", "implementation to use")
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)
func main() {
var (
f io.Reader
err error
)
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal("could not create CPU profile: ", err)
}
if err := pprof.StartCPUProfile(f); err != nil {
log.Fatal("could not start CPU profile: ", err)
}
defer pprof.StopCPUProfile()
}
if *filename != "-" {
if f, err = os.Open(*filename); err != nil {
log.Fatal("could not open file: ", err)
}
} else {
f = os.Stdin
}
// Override CPU feature flags to make sure a proper backend is used.
var h hash.Hash
switch *hashimpl {
case "avx":
cpu.X86.HasAVX = true
cpu.X86.HasAVX2 = false
h = tz.New()
case "avx2":
cpu.X86.HasAVX = true
cpu.X86.HasAVX2 = true
h = tz.New()
case "generic":
cpu.X86.HasAVX = false
cpu.X86.HasAVX2 = false
h = tz.New()
default:
log.Fatalf("Invalid backend: %s", *hashimpl)
}
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if _, err := io.Copy(h, f); err != nil {
log.Fatal("error while reading file: ", err)
}
fmt.Printf("%x\t%s\n", h.Sum(nil), *filename)
if *memprofile != "" {
f, err := os.Create(*memprofile)
if err != nil {
log.Fatal("could not create memory profile: ", err)
}
runtime.GC() // get up-to-date statistics
if err := pprof.WriteHeapProfile(f); err != nil {
log.Fatal("could not write memory profile: ", err)
}
f.Close()
}
}