2c8b627008
Integers are for numbers, enabling arithmetic like subtractions and for loops without getting shot in the foot. Unsigneds are for bitfields. - "int" for numbers that will always be laughably smaller than four billion, and where we don't care about the serialization format. - "int32" for numbers that will always be laughably smaller than four billion, and will be serialized to four bytes. - "int64" for numbers that may approach four billion or will be serialized to eight bytes. - "uint32" and "uint64" for bitfields, depending on required number of bits and serialization format. Likewise "uint8" and "uint16", although rare in this project since they don't exist in XDR. - "int8", "int16" and plain "uint" are almost never useful.
73 lines
2.1 KiB
Go
73 lines
2.1 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. If not, see <http://www.gnu.org/licenses/>.
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// +build !solaris,!windows
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package main
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import (
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"fmt"
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"os"
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"runtime"
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"syscall"
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"time"
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"github.com/syncthing/protocol"
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)
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func init() {
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if innerProcess && os.Getenv("STPERFSTATS") != "" {
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go savePerfStats(fmt.Sprintf("perfstats-%d.csv", syscall.Getpid()))
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}
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}
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func savePerfStats(file string) {
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fd, err := os.Create(file)
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if err != nil {
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panic(err)
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}
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var prevUsage int64
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var prevTime int64
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var rusage syscall.Rusage
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var memstats runtime.MemStats
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var prevIn, prevOut int64
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t0 := time.Now()
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for t := range time.NewTicker(250 * time.Millisecond).C {
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syscall.Getrusage(syscall.RUSAGE_SELF, &rusage)
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curTime := time.Now().UnixNano()
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timeDiff := curTime - prevTime
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curUsage := rusage.Utime.Nano() + rusage.Stime.Nano()
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usageDiff := curUsage - prevUsage
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cpuUsagePercent := 100 * float64(usageDiff) / float64(timeDiff)
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prevTime = curTime
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prevUsage = curUsage
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in, out := protocol.TotalInOut()
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var inRate, outRate float64
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if timeDiff > 0 {
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inRate = float64(in-prevIn) / (float64(timeDiff) / 1e9) // bytes per second
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outRate = float64(out-prevOut) / (float64(timeDiff) / 1e9) // bytes per second
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}
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prevIn, prevOut = in, out
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runtime.ReadMemStats(&memstats)
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startms := int(t.Sub(t0).Seconds() * 1000)
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fmt.Fprintf(fd, "%d\t%f\t%d\t%d\t%.0f\t%.0f\n", startms, cpuUsagePercent, memstats.Alloc, memstats.Sys-memstats.HeapReleased, inRate, outRate)
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}
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}
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