AdGuardHome/internal/home/memory.go

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package home
import (
"os"
"runtime/debug"
"time"
"github.com/AdguardTeam/golibs/log"
)
// memoryUsage implements a couple of not really beautiful hacks which purpose is to
// make OS reclaim the memory freed by AdGuard Home as soon as possible.
// See this for the details on the performance hits & gains:
// https://github.com/AdguardTeam/AdGuardHome/internal/issues/2044#issuecomment-687042211
func memoryUsage(args options) {
if args.disableMemoryOptimization {
log.Info("Memory optimization is disabled")
return
}
// Makes Go allocate heap at a slower pace
// By default we keep it at 50%
debug.SetGCPercent(50)
// madvdontneed: setting madvdontneed=1 will use MADV_DONTNEED
// instead of MADV_FREE on Linux when returning memory to the
// kernel. This is less efficient, but causes RSS numbers to drop
// more quickly.
_ = os.Setenv("GODEBUG", "madvdontneed=1")
// periodically call "debug.FreeOSMemory" so
// that the OS could reclaim the free memory
go func() {
ticker := time.NewTicker(5 * time.Minute)
for range ticker.C {
log.Debug("free os memory")
debug.FreeOSMemory()
}
}()
}