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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Author: arnej
package services
import (
"fmt"
"os"
"strconv"
"strings"
"github.com/vespa-engine/vespa/client/go/internal/admin/trace"
)
const (
DROP_CACHES_CTL = "/proc/sys/vm/drop_caches"
TRANSPARENT_HUGEPAGE_ENABLED = "/sys/kernel/mm/transparent_hugepage/enabled"
TRANSPARENT_HUGEPAGE_DEFRAG = "/sys/kernel/mm/transparent_hugepage/defrag"
TRANSPARENT_HUGEPAGE_KH_DEFRAG = "/sys/kernel/mm/transparent_hugepage/khugepaged/defrag"
ZONE_RECLAIM_CTL = "/proc/sys/vm/zone_reclaim_mode"
VM_MAX_MAP_COUNT = "/proc/sys/vm/max_map_count"
)
func maybeEcho(fileName, toWrite string) bool {
f, err := os.OpenFile(fileName, os.O_WRONLY, 0)
if err == nil {
_, err = fmt.Fprintf(f, "%s\n", toWrite)
f.Close()
if err == nil {
trace.Debug("wrote", toWrite, "to", fileName)
return true
} else {
trace.Warning(err)
}
}
return false
}
func enable_transparent_hugepages_with_background_compaction() {
// Should probably also be done on host.
maybeEcho(TRANSPARENT_HUGEPAGE_ENABLED, "always")
maybeEcho(TRANSPARENT_HUGEPAGE_DEFRAG, "never")
maybeEcho(TRANSPARENT_HUGEPAGE_KH_DEFRAG, "1")
}
func disable_vm_zone_reclaim_mode() {
maybeEcho(ZONE_RECLAIM_CTL, "0")
}
func drop_caches() {
if maybeEcho(DROP_CACHES_CTL, "3") {
trace.Debug("dropped caches")
}
}
func increase_vm_max_map_count() {
const need_minimum = 262144
var min_as_text string = strconv.Itoa(need_minimum)
const name = "vm.max_map_count"
trace.Debug("Checking: " + VM_MAX_MAP_COUNT)
data, err := os.ReadFile(VM_MAX_MAP_COUNT)
if err != nil {
trace.Info("Could not check", name, " - assuming it is OK and proceeding")
return
}
line := strings.TrimSuffix(string(data), "\n")
qline := "[" + line + "]"
num, err := strconv.Atoi(line)
if err != nil || num <= 0 {
trace.Info("Bad data", qline, "checking", name, " - assuming it is OK and proceeding")
return
}
if num < need_minimum {
trace.Info("Too low", name, "["+line+"] - trying to increase it to", min_as_text)
if maybeEcho(VM_MAX_MAP_COUNT, min_as_text) {
trace.Debug("Increased:", name)
} else {
trace.Warning("Could not increase", name, "- current value", qline, "too low, should be at least", min_as_text)
}
}
}
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