在 Ubuntu 系統下，測試 NVME SSD 的讀寫速度，有好多種方法，常用的有如下幾種：

1. Gnome-disks

Gnome-disks（也稱為“Disks”）是 GNOME 桌面環境中的磁盤管理工具，有圖形界面，是測試 NVME SSD 讀寫速度操作最方便的一種。

可以通過以下方式安裝：

??? sudo apt update
??? sudo apt install gnome-disk-utility

安裝完成后，從 Settings 選擇 Disks，打開該應用。

也可以在 Run Programm 下鍵入 gnomes-disks 直接運行：

在左側的設備列表中選擇你的固態硬盤，然后點擊右上角的菜單圖標（三個豎點），選擇 "Benchmark Disk" 來進行速度測試。?

下面是一個 128GB SSD 的測試結果：

作為對比，這是 一張 64GB SD 卡的結果，看起來性能比較差：

另一張 SD 卡：

2. hdparm

當然，也可以使用 hdparm 來測試去讀取速度：

????????sudo apt-get install hdparm

????????sudo hdparm -Tt /dev/mmcblk0

/dev/mmcblk0:Timing cached reads:   9082 MB in  2.00 seconds = 4546.07 MB/secHDIO_DRIVE_CMD(identify) failed: Invalid argumentTiming buffered disk reads:  36 MB in  3.11 seconds =  11.57 MB/sec

??????? sudo hdparm -Tt /dev/nvme0n1

/dev/nvme0n1:Timing cached reads:   9754 MB in  2.00 seconds = 4882.31 MB/secHDIO_DRIVE_CMD(identify) failed: Inappropriate ioctl for deviceTiming buffered disk reads: 1056 MB in  3.00 seconds = 351.64 MB/sec

3. fio

fio 是一個功能強大的磁盤性能測試工具，可以執行各種讀取和寫入測試，并提供詳細的性能報告。

可以使用以下命令安裝 fio：

????????sudo apt update????
????????sudo apt install fio

安裝完成后，創建一個配置文件，例如：test_ssd.fio，并在其中定義測試的參數。

    [global]ioengine=libaiodirect=1runtime=60time_basedbs=4knumjobs=1size=1G[test_ssd_read]filename=/dev/nvme0n1rw=read[test_ssd_write]filename=/dev/nvme0n1rw=write[test_ssd_randrw]filename=/dev/nvme0n1rw=randrw

然后，在終端中運行以下命令來執行測試：

????????sudo fio test_ssd.fio

test_ssd_read: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1
test_ssd_write: (g=0): rw=write, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1
test_ssd_randrw: (g=0): rw=randrw, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1
fio-3.16
Starting 3 processes
Jobs: 3 (f=3): [R(1),W(1),m(1)][100.0%][r=40.2MiB/s,w=81.1MiB/s][r=10.3k,w=20.8k IOPS][eta 00m:00s]
test_ssd_read: (groupid=0, jobs=1): err= 0: pid=11250: Mon Jan  6 13:43:18 2025read: IOPS=6125, BW=23.9MiB/s (25.1MB/s)(1436MiB/60001msec)slat (usec): min=3, max=7732, avg=14.71, stdev=30.46clat (nsec): min=1750, max=23628k, avg=144762.35, stdev=177571.14lat (usec): min=37, max=23643, avg=160.05, stdev=180.14clat percentiles (usec):|  1.00th=[   52],  5.00th=[   55], 10.00th=[   66], 20.00th=[   73],| 30.00th=[   79], 40.00th=[  104], 50.00th=[  125], 60.00th=[  141],| 70.00th=[  163], 80.00th=[  192], 90.00th=[  262], 95.00th=[  306],| 99.00th=[  367], 99.50th=[  392], 99.90th=[ 3458], 99.95th=[ 3720],| 99.99th=[ 5866]bw (  KiB/s): min=22280, max=25600, per=58.79%, avg=24492.71, stdev=542.05, samples=119iops        : min= 5570, max= 6400, avg=6123.14, stdev=135.51, samples=119lat (usec)   : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.19%lat (usec)   : 100=38.84%, 250=49.97%, 500=10.75%, 750=0.04%, 1000=0.02%lat (msec)   : 2=0.04%, 4=0.11%, 10=0.02%, 20=0.01%, 50=0.01%cpu          : usr=5.19%, sys=16.83%, ctx=367841, majf=0, minf=18IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%issued rwts: total=367511,0,0,0 short=0,0,0,0 dropped=0,0,0,0latency   : target=0, window=0, percentile=100.00%, depth=1
test_ssd_write: (groupid=0, jobs=1): err= 0: pid=11251: Mon Jan  6 13:43:18 2025write: IOPS=16.3k, BW=63.7MiB/s (66.8MB/s)(3820MiB/60001msec); 0 zone resetsslat (usec): min=3, max=1150, avg=13.95, stdev= 2.73clat (nsec): min=1167, max=3738.0k, avg=43920.67, stdev=12785.94lat (usec): min=28, max=3742, avg=58.42, stdev=13.36clat percentiles (usec):|  1.00th=[   41],  5.00th=[   41], 10.00th=[   42], 20.00th=[   42],| 30.00th=[   42], 40.00th=[   43], 50.00th=[   43], 60.00th=[   43],| 70.00th=[   44], 80.00th=[   46], 90.00th=[   48], 95.00th=[   51],| 99.00th=[   60], 99.50th=[   65], 99.90th=[  114], 99.95th=[  174],| 99.99th=[  326]bw (  KiB/s): min=62512, max=69112, per=79.17%, avg=65189.33, stdev=725.54, samples=119iops        : min=15628, max=17278, avg=16297.32, stdev=181.38, samples=119lat (usec)   : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=93.90%lat (usec)   : 100=5.97%, 250=0.10%, 500=0.01%, 750=0.01%, 1000=0.01%lat (msec)   : 2=0.01%, 4=0.01%cpu          : usr=13.82%, sys=39.91%, ctx=977956, majf=0, minf=13IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%issued rwts: total=0,978007,0,0 short=0,0,0,0 dropped=0,0,0,0latency   : target=0, window=0, percentile=100.00%, depth=1
test_ssd_randrw: (groupid=0, jobs=1): err= 0: pid=11252: Mon Jan  6 13:43:18 2025read: IOPS=4290, BW=16.8MiB/s (17.6MB/s)(1006MiB/60001msec)slat (usec): min=3, max=4648, avg=14.43, stdev=20.50clat (usec): min=2, max=8482, avg=142.87, stdev=154.52lat (usec): min=29, max=8497, avg=157.87, stdev=156.10clat percentiles (usec):|  1.00th=[   46],  5.00th=[   50], 10.00th=[   70], 20.00th=[   73],| 30.00th=[   77], 40.00th=[   89], 50.00th=[  116], 60.00th=[  137],| 70.00th=[  161], 80.00th=[  200], 90.00th=[  265], 95.00th=[  318],| 99.00th=[  383], 99.50th=[  408], 99.90th=[ 3163], 99.95th=[ 3654],| 99.99th=[ 4146]bw (  KiB/s): min=15536, max=21768, per=41.20%, avg=17163.20, stdev=1419.46, samples=119iops        : min= 3884, max= 5442, avg=4290.76, stdev=354.88, samples=119write: IOPS=4286, BW=16.7MiB/s (17.6MB/s)(1005MiB/60001msec); 0 zone resetsslat (usec): min=3, max=8166, avg=15.19, stdev=26.92clat (usec): min=2, max=10019, avg=51.45, stdev=52.63lat (usec): min=28, max=10041, avg=67.20, stdev=59.35clat percentiles (usec):|  1.00th=[   41],  5.00th=[   42], 10.00th=[   42], 20.00th=[   42],| 30.00th=[   43], 40.00th=[   43], 50.00th=[   43], 60.00th=[   44],| 70.00th=[   47], 80.00th=[   50], 90.00th=[   75], 95.00th=[  104],| 99.00th=[  113], 99.50th=[  130], 99.90th=[  215], 99.95th=[  314],| 99.99th=[ 2540]bw (  KiB/s): min=15312, max=21620, per=20.81%, avg=17139.04, stdev=1449.15, samples=119iops        : min= 3828, max= 5405, avg=4284.72, stdev=362.32, samples=119lat (usec)   : 4=0.02%, 10=0.01%, 20=0.01%, 50=42.73%, 100=24.79%lat (usec)   : 250=26.79%, 500=5.53%, 750=0.02%, 1000=0.01%lat (msec)   : 2=0.02%, 4=0.07%, 10=0.01%, 20=0.01%cpu          : usr=7.95%, sys=23.05%, ctx=514776, majf=0, minf=20IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%issued rwts: total=257454,257191,0,0 short=0,0,0,0 dropped=0,0,0,0latency   : target=0, window=0, percentile=100.00%, depth=1Run status group 0 (all jobs):READ: bw=40.7MiB/s (42.7MB/s), 16.8MiB/s-23.9MiB/s (17.6MB/s-25.1MB/s), io=2441MiB (2560MB), run=60001-60001msecWRITE: bw=80.4MiB/s (84.3MB/s), 16.7MiB/s-63.7MiB/s (17.6MB/s-66.8MB/s), io=4825MiB (5059MB), run=60001-60001msecDisk stats (read/write):nvme0n1: ios=624031/1233179, merge=0/0, ticks=84957/51088, in_queue=136046, util=100.00%

將 numjobs參數改為：8，最后結果如下：

Run status group 0 (all jobs):READ: bw=177MiB/s (186MB/s), 8521KiB/s-13.6MiB/s (8726kB/s-14.2MB/s), io=10.4GiB (11.1GB), run=60001-60006msecWRITE: bw=280MiB/s (294MB/s), 8509KiB/s-27.0MiB/s (8713kB/s-29.3MB/s), io=16.4GiB (17.6GB), run=60001-60006msecDisk stats (read/write):nvme0n1: ios=2713427/4292312, merge=0/0, ticks=702077/462120, in_queue=1164198, util=100.00%

可見，設置不同的參數，測得的結果也大不相同，參數靈活，使用復雜。

??????????????????????????????????????????????????????????????? 老徐，2025/01/06