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Copy pathobd.go
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165 lines (145 loc) · 4.96 KB
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/*
* MinIO Cloud Storage, (C) 2020 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 (
"context"
"fmt"
"os"
"time"
"github.com/dustin/go-humanize"
"github.com/montanaflynn/stats"
)
// Latency holds latency information for write operations to the drive
type Latency struct {
Avg float64 `json:"avg_secs,omitempty"`
Percentile50 float64 `json:"percentile50_secs,omitempty"`
Percentile90 float64 `json:"percentile90_secs,omitempty"`
Percentile99 float64 `json:"percentile99_secs,omitempty"`
Min float64 `json:"min_secs,omitempty"`
Max float64 `json:"max_secs,omitempty"`
}
// Throughput holds throughput information for write operations to the drive
type Throughput struct {
Avg float64 `json:"avg_bytes_per_sec,omitempty"`
Percentile50 float64 `json:"percentile50_bytes_per_sec,omitempty"`
Percentile90 float64 `json:"percentile90_bytes_per_sec,omitempty"`
Percentile99 float64 `json:"percentile99_bytes_per_sec,omitempty"`
Min float64 `json:"min_bytes_per_sec,omitempty"`
Max float64 `json:"max_bytes_per_sec,omitempty"`
}
// GetOBDInfo about the drive
func GetOBDInfo(ctx context.Context, drive, fsPath string) (Latency, Throughput, error) {
// Create a file with O_DIRECT flag, choose default umask and also make sure
// we are exclusively writing to a new file using O_EXCL.
w, err := OpenFileDirectIO(fsPath, os.O_CREATE|os.O_WRONLY|os.O_EXCL, 0666)
if err != nil {
return Latency{}, Throughput{}, err
}
defer func() {
w.Close()
os.Remove(fsPath)
}()
blockSize := 4 * humanize.MiByte
fileSize := 256 * humanize.MiByte
latencies := make([]float64, fileSize/blockSize)
throughputs := make([]float64, fileSize/blockSize)
data := AlignedBlock(blockSize)
for i := 0; i < (fileSize / blockSize); i++ {
if ctx.Err() != nil {
return Latency{}, Throughput{}, ctx.Err()
}
startTime := time.Now()
if n, err := w.Write(data); err != nil {
return Latency{}, Throughput{}, err
} else if n != blockSize {
return Latency{}, Throughput{}, fmt.Errorf("Expected to write %d, but only wrote %d", blockSize, n)
}
latencyInSecs := time.Since(startTime).Seconds()
latencies[i] = latencyInSecs
}
// Sync every full writes fdatasync
Fdatasync(w)
for i := range latencies {
throughput := float64(blockSize) / latencies[i]
throughputs[i] = throughput
}
var avgLatency float64
var percentile50Latency float64
var percentile90Latency float64
var percentile99Latency float64
var minLatency float64
var maxLatency float64
var avgThroughput float64
var percentile50Throughput float64
var percentile90Throughput float64
var percentile99Throughput float64
var minThroughput float64
var maxThroughput float64
if avgLatency, err = stats.Mean(latencies); err != nil {
return Latency{}, Throughput{}, err
}
if percentile50Latency, err = stats.Percentile(latencies, 50); err != nil {
return Latency{}, Throughput{}, err
}
if percentile90Latency, err = stats.Percentile(latencies, 90); err != nil {
return Latency{}, Throughput{}, err
}
if percentile99Latency, err = stats.Percentile(latencies, 99); err != nil {
return Latency{}, Throughput{}, err
}
if maxLatency, err = stats.Max(latencies); err != nil {
return Latency{}, Throughput{}, err
}
if minLatency, err = stats.Min(latencies); err != nil {
return Latency{}, Throughput{}, err
}
l := Latency{
Avg: avgLatency,
Percentile50: percentile50Latency,
Percentile90: percentile90Latency,
Percentile99: percentile99Latency,
Min: minLatency,
Max: maxLatency,
}
if avgThroughput, err = stats.Mean(throughputs); err != nil {
return Latency{}, Throughput{}, err
}
if percentile50Throughput, err = stats.Percentile(throughputs, 50); err != nil {
return Latency{}, Throughput{}, err
}
if percentile90Throughput, err = stats.Percentile(throughputs, 90); err != nil {
return Latency{}, Throughput{}, err
}
if percentile99Throughput, err = stats.Percentile(throughputs, 99); err != nil {
return Latency{}, Throughput{}, err
}
if maxThroughput, err = stats.Max(throughputs); err != nil {
return Latency{}, Throughput{}, err
}
if minThroughput, err = stats.Min(throughputs); err != nil {
return Latency{}, Throughput{}, err
}
t := Throughput{
Avg: avgThroughput,
Percentile50: percentile50Throughput,
Percentile90: percentile90Throughput,
Percentile99: percentile99Throughput,
Min: minThroughput,
Max: maxThroughput,
}
return l, t, nil
}