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754f7a8a39
replace io.Discard usage to fix NUMA copy() latencies On NUMA systems copying from 8K buffer allocated via io.Discard leads to large latency build-up for every ``` copy(new8kbuf, largebuf) ``` can in-cur upto 1ms worth of latencies on NUMA systems due to memory sharding across NUMA nodes.
41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
// Copyright (c) 2015-2023 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package ioutil
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import (
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"io"
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)
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// Discard is just like io.Discard without the io.ReaderFrom compatible
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// implementation which is buggy on NUMA systems, we have to use a simpler
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// io.Writer implementation alone avoids also unnecessary buffer copies,
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// and as such incurred latencies.
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var Discard io.Writer = discard{}
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// discard is /dev/null for Golang.
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type discard struct{}
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func (discard) Write(p []byte) (int, error) {
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return len(p), nil
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}
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// DiscardReader discarded reader
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func DiscardReader(r io.Reader) {
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Copy(Discard, r)
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}
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