The Prometheus monitoring system and time series database.
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// Copyright 2020 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !windows
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package chunks
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// HeadChunkFilePreallocationSize is the size to which the m-map file should be preallocated when a new file is cut.
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// Windows needs pre-allocations while the other OS does not. But we observed that a 0 pre-allocation causes unit tests to flake.
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// This small allocation for non-Windows OSes removes the flake.
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var HeadChunkFilePreallocationSize int64 = MinWriteBufferSize * 2
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