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c14dafce43
Do not cache too big byte buffers and too big writeRequestCtx objects,
since it is cheaper to re-create them instead of wasting RAM for their caching.
This reverts 7f6f350ee1
60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package leveledbytebufferpool
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import (
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"math/bits"
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"sync"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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)
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// pools contains pools for byte slices of various capacities.
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//
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// pools[0] is for capacities from 0 to 8
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// pools[1] is for capacities from 9 to 16
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// pools[2] is for capacities from 17 to 32
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// ...
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// pools[n] is for capacities from 2^(n+2)+1 to 2^(n+3)
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//
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// Limit the maximum capacity to 2^18, since there are no performance benefits
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// in caching byte slices with bigger capacities.
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var pools [17]sync.Pool
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// Get returns byte buffer with the given capacity.
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func Get(capacity int) *bytesutil.ByteBuffer {
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id, capacityNeeded := getPoolIDAndCapacity(capacity)
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for i := 0; i < 2; i++ {
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if id < 0 || id >= len(pools) {
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break
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}
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if v := pools[id].Get(); v != nil {
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return v.(*bytesutil.ByteBuffer)
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}
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id++
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}
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return &bytesutil.ByteBuffer{
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B: make([]byte, 0, capacityNeeded),
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}
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}
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// Put returns bb to the pool.
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func Put(bb *bytesutil.ByteBuffer) {
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capacity := cap(bb.B)
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id, poolCapacity := getPoolIDAndCapacity(capacity)
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if capacity <= poolCapacity {
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bb.Reset()
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pools[id].Put(bb)
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}
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}
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func getPoolIDAndCapacity(size int) (int, int) {
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size--
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if size < 0 {
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size = 0
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}
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size >>= 3
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id := bits.Len(uint(size))
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if id >= len(pools) {
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id = len(pools) - 1
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}
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return id, (1 << (id + 3))
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}
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