b3a68bb806
This commit adds a new command-line argument that disables memory optimizations AGH is using. These memory optimizations might be necessary on low-memory devices, but they aren't free and there's a performance hit (see #2044). Now they can be disabled - just pass --no-mem-optimization when you run AGH or when you install the service -- ./AdGuardHome -s install --no-mem-optimization Closes: #2044
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package home
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import (
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"os"
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"runtime/debug"
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"time"
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"github.com/AdguardTeam/golibs/log"
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)
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// memoryUsage implements a couple of not really beautiful hacks which purpose is to
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// make OS reclaim the memory freed by AdGuard Home as soon as possible.
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// See this for the details on the performance hits & gains:
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// https://github.com/AdguardTeam/AdGuardHome/issues/2044#issuecomment-687042211
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func memoryUsage(args options) {
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if args.disableMemoryOptimization {
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log.Info("Memory optimization is disabled")
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return
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}
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// Makes Go allocate heap at a slower pace
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// By default we keep it at 50%
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debug.SetGCPercent(50)
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// madvdontneed: setting madvdontneed=1 will use MADV_DONTNEED
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// instead of MADV_FREE on Linux when returning memory to the
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// kernel. This is less efficient, but causes RSS numbers to drop
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// more quickly.
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_ = os.Setenv("GODEBUG", "madvdontneed=1")
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// periodically call "debug.FreeOSMemory" so
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// that the OS could reclaim the free memory
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go func() {
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ticker := time.NewTicker(5 * time.Minute)
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for {
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select {
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case t := <-ticker.C:
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t.Second()
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log.Debug("Free OS memory")
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debug.FreeOSMemory()
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}
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}
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}()
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}
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