Code:
TEST_WRITE: (g=0): rw=write, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=libaio, iodepth=32
fio-3.28
Starting 1 process
Jobs: 1 (f=1): [W(1)][-.-%][eta 00m:00s]
Jobs: 1 (f=1): [W(1)][-.-%][eta 00m:00s]
TEST_WRITE: (groupid=0, jobs=1): err= 0: pid=861190: Tue Feb 13 07:54:18 2024
write: IOPS=872, BW=873MiB/s (915MB/s)(10.0GiB/11736msec); 0 zone resets
slat (usec): min=121, max=1734, avg=407.70, stdev=273.42
clat (nsec): min=1198, max=7534.3M, avg=35377576.92, stdev=412853630.65
lat (usec): min=135, max=7535.0k, avg=35785.57, stdev=412876.22
clat percentiles (msec):
| 1.00th=[ 5], 5.00th=[ 5], 10.00th=[ 6], 20.00th=[ 6],
| 30.00th=[ 6], 40.00th=[ 8], 50.00th=[ 11], 60.00th=[ 15],
| 70.00th=[ 16], 80.00th=[ 18], 90.00th=[ 21], 95.00th=[ 31],
| 99.00th=[ 46], 99.50th=[ 49], 99.90th=[ 7550], 99.95th=[ 7550],
| 99.99th=[ 7550]
bw ( MiB/s): min= 548, max= 4800, per=100.00%, avg=2215.33, stdev=1465.65, samples=9
iops : min= 548, max= 4800, avg=2215.33, stdev=1465.65, samples=9
lat (usec) : 2=0.02%, 4=0.03%, 250=0.03%, 500=0.04%, 750=0.07%
lat (usec) : 1000=0.03%
lat (msec) : 2=0.21%, 4=0.41%, 10=45.43%, 20=40.48%, 50=12.95%
lat (msec) : >=2000=0.30%
fsync/fdatasync/sync_file_range:
sync (nsec): min=446, max=446, avg=446.00, stdev= 0.00
sync percentiles (nsec):
| 1.00th=[ 446], 5.00th=[ 446], 10.00th=[ 446], 20.00th=[ 446],
| 30.00th=[ 446], 40.00th=[ 446], 50.00th=[ 446], 60.00th=[ 446],
| 70.00th=[ 446], 80.00th=[ 446], 90.00th=[ 446], 95.00th=[ 446],
| 99.00th=[ 446], 99.50th=[ 446], 99.90th=[ 446], 99.95th=[ 446],
| 99.99th=[ 446]
cpu : usr=3.69%, sys=29.50%, ctx=13527, majf=0, minf=15
IO depths : 1=0.1%, 2=0.1%, 4=0.2%, 8=0.4%, 16=0.8%, 32=98.5%, >=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=0.1%, 64=0.0%, >=64=0.0%
issued rwts: total=0,10240,0,1 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
WRITE: bw=873MiB/s (915MB/s), 873MiB/s-873MiB/s (915MB/s-915MB/s), io=10.0GiB (10.7GB), run=11736-11736msec
TEST_READ: (g=0): rw=read, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=libaio, iodepth=32
fio-3.28
Starting 1 process
Jobs: 1 (f=1)
TEST_READ: (groupid=0, jobs=1): err= 0: pid=861236: Tue Feb 13 07:54:20 2024
read: IOPS=8006, BW=8006MiB/s (8395MB/s)(10.0GiB/1279msec)
slat (usec): min=77, max=511, avg=123.68, stdev=39.18
clat (nsec): min=1240, max=9849.2k, avg=3827351.26, stdev=1161532.91
lat (usec): min=111, max=10188, avg=3951.21, stdev=1197.20
clat percentiles (usec):
| 1.00th=[ 2212], 5.00th=[ 3326], 10.00th=[ 3359], 20.00th=[ 3425],
| 30.00th=[ 3425], 40.00th=[ 3458], 50.00th=[ 3490], 60.00th=[ 3490],
| 70.00th=[ 3523], 80.00th=[ 3589], 90.00th=[ 4686], 95.00th=[ 7308],
| 99.00th=[ 7635], 99.50th=[ 7832], 99.90th=[ 8225], 99.95th=[ 8848],
| 99.99th=[ 9634]
bw ( MiB/s): min= 6522, max= 8928, per=96.49%, avg=7725.00, stdev=1701.30, samples=2
iops : min= 6522, max= 8928, avg=7725.00, stdev=1701.30, samples=2
lat (usec) : 2=0.04%, 4=0.01%, 250=0.10%, 500=0.10%, 750=0.10%
lat (usec) : 1000=0.14%
lat (msec) : 2=0.43%, 4=87.92%, 10=11.17%
cpu : usr=0.23%, sys=99.37%, ctx=1, majf=0, minf=8204
IO depths : 1=0.1%, 2=0.1%, 4=0.2%, 8=0.4%, 16=0.8%, 32=98.5%, >=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=0.1%, 64=0.0%, >=64=0.0%
issued rwts: total=10240,0,0,0 short=0,0,0,0 dropped=0,0,0,0
latency : target=0, window=0, percentile=100.00%, depth=32
Run status group 0 (all jobs):
READ: bw=8006MiB/s (8395MB/s), 8006MiB/s-8006MiB/s (8395MB/s-8395MB/s), io=10.0GiB (10.7GB), run=1279-1279msec
I know: "Show me the data!" --> "Just the facts mame..."