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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Author: arnej
package osutil
import (
"os"
"strconv"
"strings"
"github.com/vespa-engine/vespa/client/go/internal/admin/envvars"
"github.com/vespa-engine/vespa/client/go/internal/admin/trace"
)
func OptionallyReduceTimerFrequency() {
if os.Getenv(envvars.VESPA_TIMER_HZ) == "" {
backticks := BackTicksIgnoreStderr
uname, _ := backticks.Run("uname", "-r")
if strings.Contains(uname, "linuxkit") {
setTimerHZ("Docker on macOS detected.", "100")
} else {
virt, _ := backticks.Run("systemd-detect-virt", "--vm")
if strings.TrimSpace(virt) == "qemu" {
setTimerHZ("QEMU virtualization detected.", "100")
}
}
}
}
func setTimerHZ(description, timerHZ string) {
if os.Getenv(envvars.VESPA_TIMER_HZ) == timerHZ {
return
}
trace.Trace(
description,
"Reducing base frequency from 1000hz to "+timerHZ+"hz due to high cost of sampling time.",
"This will reduce timeout accuracy.")
os.Setenv(envvars.VESPA_TIMER_HZ, timerHZ)
}
func TuneResourceLimits() {
var numfiles uint64 = 262144
var numprocs uint64 = 409600
if env := os.Getenv(envvars.FILE_DESCRIPTOR_LIMIT); env != "" {
n, err := strconv.Atoi(env)
if err != nil {
numfiles = uint64(n)
}
}
if env := os.Getenv(envvars.NUM_PROCESSES_LIMIT); env != "" {
n, err := strconv.Atoi(env)
if err != nil {
numprocs = uint64(n)
}
}
SetResourceLimit(RLIMIT_CORE, NO_RLIMIT)
SetResourceLimit(RLIMIT_NOFILE, numfiles)
SetResourceLimit(RLIMIT_NPROC, numprocs)
}
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