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Copy pathspeedtest.go
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97 lines (82 loc) · 2.56 KB
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/*
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package disk
import (
"io"
"math"
"time"
humanize "github.com/dustin/go-humanize"
)
var speedTestBlockSize = 4 * humanize.MiByte
// speedTestWrite computes the write speed by writing
// `speedTestFileSize` bytes of data to `w` in 4MiB direct-aligned
// blocks present in `buf`
func speedTestWrite(w io.Writer, buf []byte, size int64) (float64, error) {
// Write speedTestFileSize of data and record write speed
startTime := time.Now()
remaining := size
for remaining > 0 {
var toWrite int
// there's more remaining to write than the buffer can hold
if int64(len(buf)) < remaining {
toWrite = len(buf)
} else { // buffer can hold all there is to write
toWrite = int(remaining)
}
written, err := w.Write(buf[:toWrite])
if err != nil {
return 0, err
}
remaining = remaining - int64(written)
}
elapsedTime := time.Since(startTime).Seconds()
totalWriteMBs := float64(size) / humanize.MiByte
writeSpeed := totalWriteMBs / elapsedTime
return roundToTwoDecimals(writeSpeed), nil
}
// speedTestRead computes the read speed by reading
// `speedTestFileSize` bytes from the reader `r` using 4MiB size `buf`
func speedTestRead(r io.Reader, buf []byte, size int64) (float64, error) {
// Read speedTestFileSize and record read speed
startTime := time.Now()
remaining := size
for remaining > 0 {
// reads `speedTestBlockSize` on every read
n, err := io.ReadFull(r, buf)
if err == io.ErrUnexpectedEOF || err == nil {
remaining = remaining - int64(n)
continue
}
// Nothing more left to read from the Reader
if err == io.EOF {
break
}
// Error while reading from the underlying Reader
if err != nil {
return 0, err
}
}
if remaining > 0 {
return 0, io.ErrUnexpectedEOF
}
elapsedTime := time.Since(startTime).Seconds()
totalReadMBs := float64(size) / humanize.MiByte
readSpeed := totalReadMBs / elapsedTime
return roundToTwoDecimals(readSpeed), nil
}
func roundToTwoDecimals(num float64) float64 {
return math.Round(num*100) / 100
}