98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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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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*/
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package disk
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import (
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"io"
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"math"
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"time"
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humanize "github.com/dustin/go-humanize"
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)
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var speedTestBlockSize = 4 * humanize.MiByte
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// speedTestWrite computes the write speed by writing
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// `speedTestFileSize` bytes of data to `w` in 4MiB direct-aligned
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// blocks present in `buf`
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func speedTestWrite(w io.Writer, buf []byte, size int64) (float64, error) {
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// Write speedTestFileSize of data and record write speed
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startTime := time.Now()
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remaining := size
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for remaining > 0 {
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var toWrite int
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// there's more remaining to write than the buffer can hold
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if int64(len(buf)) < remaining {
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toWrite = len(buf)
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} else { // buffer can hold all there is to write
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toWrite = int(remaining)
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}
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written, err := w.Write(buf[:toWrite])
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if err != nil {
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return 0, err
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}
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remaining = remaining - int64(written)
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}
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elapsedTime := time.Since(startTime).Seconds()
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totalWriteMBs := float64(size) / humanize.MiByte
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writeSpeed := totalWriteMBs / elapsedTime
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return roundToTwoDecimals(writeSpeed), nil
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}
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// speedTestRead computes the read speed by reading
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// `speedTestFileSize` bytes from the reader `r` using 4MiB size `buf`
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func speedTestRead(r io.Reader, buf []byte, size int64) (float64, error) {
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// Read speedTestFileSize and record read speed
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startTime := time.Now()
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remaining := size
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for remaining > 0 {
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// reads `speedTestBlockSize` on every read
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n, err := io.ReadFull(r, buf)
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if err == io.ErrUnexpectedEOF || err == nil {
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remaining = remaining - int64(n)
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continue
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}
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// Nothing more left to read from the Reader
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if err == io.EOF {
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break
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}
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// Error while reading from the underlying Reader
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if err != nil {
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return 0, err
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}
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}
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if remaining > 0 {
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return 0, io.ErrUnexpectedEOF
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}
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elapsedTime := time.Since(startTime).Seconds()
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totalReadMBs := float64(size) / humanize.MiByte
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readSpeed := totalReadMBs / elapsedTime
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return roundToTwoDecimals(readSpeed), nil
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}
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func roundToTwoDecimals(num float64) float64 {
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return math.Round(num*100) / 100
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}
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