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60 lines
2.3 KiB
Go
60 lines
2.3 KiB
Go
package memory
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import (
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"flag"
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"fmt"
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"sync"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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)
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var (
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allowedPercent = flag.Float64("memory.allowedPercent", 60, `Allowed percent of system memory VictoriaMetrics caches may occupy. See also -memory.allowedBytes. Too low a value may increase cache miss rate usually resulting in higher CPU and disk IO usage. Too high a value may evict too much data from OS page cache which will result in higher disk IO usage`)
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allowedBytes = flagutil.NewBytes("memory.allowedBytes", 0, `Allowed size of system memory VictoriaMetrics caches may occupy. This option overrides -memory.allowedPercent if set to a non-zero value. Too low a value may increase the cache miss rate usually resulting in higher CPU and disk IO usage. Too high a value may evict too much data from OS page cache resulting in higher disk IO usage`)
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)
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var (
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allowedMemory int
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remainingMemory int
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)
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var once sync.Once
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func initOnce() {
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if !flag.Parsed() {
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// Do not use logger.Panicf here, since logger may be uninitialized yet.
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panic(fmt.Errorf("BUG: memory.Allowed must be called only after flag.Parse call"))
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}
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mem := sysTotalMemory()
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if allowedBytes.N <= 0 {
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if *allowedPercent < 1 || *allowedPercent > 200 {
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logger.Panicf("FATAL: -memory.allowedPercent must be in the range [1...200]; got %g", *allowedPercent)
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}
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percent := *allowedPercent / 100
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allowedMemory = int(float64(mem) * percent)
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remainingMemory = mem - allowedMemory
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logger.Infof("limiting caches to %d bytes, leaving %d bytes to the OS according to -memory.allowedPercent=%g", allowedMemory, remainingMemory, *allowedPercent)
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} else {
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allowedMemory = allowedBytes.N
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remainingMemory = mem - allowedMemory
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logger.Infof("limiting caches to %d bytes, leaving %d bytes to the OS according to -memory.allowedBytes=%s", allowedMemory, remainingMemory, allowedBytes.String())
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}
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}
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// Allowed returns the amount of system memory allowed to use by the app.
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//
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// The function must be called only after flag.Parse is called.
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func Allowed() int {
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once.Do(initOnce)
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return allowedMemory
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}
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// Remaining returns the amount of memory remaining to the OS.
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//
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// This function must be called only after flag.Parse is called.
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func Remaining() int {
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once.Do(initOnce)
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return remainingMemory
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}
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