Názory k článku GTK+ 4.0 přijde až v roce 2019

Chapu, ze kapacita/cena je stale unbeatable, ale tak mame jeste jine parametry k porovnani jako je:
- vaha
- velikost
- spotreba
- a hlavne VYKON.

Pokud tyhle parametry zakomponujes jako zajimave do pomeroveho vzorce, vyjde ti, ze je to lepsi. Alech chapu, do velkeho pole je to investice brutalni, tj. 100 a vice disku. Na experimentalnich serverech jsem jeste neupgradoval, ale jinak uz mam 2x workstation, 2x laptop pouze na NVME vsechno Samsung , proste to fici. Nekdy vyvijim projekty ktere testuju na datovych setech cca 30-2000GB (i jeden soubor ma nekdy 50GB) a drive jsem pouzival drahou RAM jako disk, s NVME uz to neresim. Ale uznavam, zatim je to draha sranda.

Poznamka: Do jedne workstation jsme poridil kartu Dell 4x M.2 za 6500 (ebay), ale bohuzel mi jadro 4.12.4-gentoo detekuje pouze prvni disk, stejne dalsi nemam zatim (pockam, az zlevni trochu... :-)
https://www.amazon.com/Dell-Ultra-Speed-Drive-Quad-Adapter/dp/B0714MMD6M

Delal jsem nejaky mereni vykonu zhruba 20.9.2017 +-, ale pokud spocitas pomer cena/vykon, tak to zas tak hrozne nevypada :D

Tady jsou vysledky dummy testu trougputu na jednom disku:
# nejdriv zapisu nejaky 1GB soubor
andromeda /opt # dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasyn­c,notrunc status=progress
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 1.14752 s, 936 MB/s

# vycistim systemovy buffer
andromeda /opt # echo 3 > /proc/sys/vm/­drop_caches

# A ted zkusim cist s prazdnym buferem
andromeda /opt # dd if=tempfile of=/dev/null bs=1M count=1024 status=progress
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.384912 s, 2.8 GB/s

# A ted to same, ale necistim buffer
andromeda /opt # dd if=tempfile of=/dev/null bs=1M count=1024 status=progress
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.161535 s, 6.6 GB/s

Takze pri cteni s buferem mam tady 6.6 GB/s. To je skoro to, co uvadeji oni, jako max.

Vylepseni: Jelikoz karta podporuje celkem 4 Chci tam strcit 4 1TB disky a zapojit je do raidu 0, ale casem :-)

# Jinak tady je jeste jiny vystup:
# !!! Tato metoda je nezavisla na zarovnani diskoveho oddilu.
andromeda ~ # hdparm -Tt /dev/nvme0n1

/dev/nvme0n1:
Timing cached reads: 23776 MB in 2.00 seconds = 11899.49 MB/sec
Timing buffered disk reads: 7650 MB in 3.00 seconds = 2549.95 MB/sec

No a nakonec jsem provedl jeste test pomoci utility fio pro nahodny pristup, nyni na 4GB velkem souboru:

# SYNC IO RANDOM ACCESS
andromeda /opt # fio random-read-test.fio
random-read: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=psync, iodepth=1
fio-2.15
Starting 1 process
random-read: Laying out IO file(s) (1 file(s) / 4096MB)
Jobs: 1 (f=1): [r(1)] [100.0% done] [64824KB/0KB/0KB /s] [16.3K/0/0 iops] [eta 00m:00s]
random-read: (groupid=0, jobs=1): err= 0: pid=6125: Wed Sep 20 18:08:38 2017
read : io=4096.0MB, bw=64992KB/s, iops=16247, runt= 64536msec
clat (usec): min=13, max=2288, avg=60.52, stdev= 5.64
lat (usec): min=13, max=2288, avg=60.62, stdev= 5.64
clat percentiles (usec):
| 1.00th=[ 57], 5.00th=[ 58], 10.00th=[ 58], 20.00th=[ 59],
| 30.00th=[ 59], 40.00th=[ 59], 50.00th=[ 60], 60.00th=[ 60],
| 70.00th=[ 60], 80.00th=[ 61], 90.00th=[ 62], 95.00th=[ 67],
| 99.00th=[ 91], 99.50th=[ 92], 99.90th=[ 95], 99.95th=[ 98],
| 99.99th=[ 110]
lat (usec) : 20=0.01%, 50=0.01%, 100=99.96%, 250=0.04%, 750=0.01%
lat (msec) : 2=0.01%, 4=0.01%
cpu : usr=4.58%, sys=6.32%, ctx=1048635, majf=0, minf=17
IO 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 : total=r=104857­6/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
READ: io=4096.0MB, aggrb=64991KB/s, minb=64991KB/s, maxb=64991KB/s, mint=64536msec, maxt=64536msec

Disk stats (read/write):
nvme0n1: ios=1045941/17, merge=0/34, ticks=57687/3, in_queue=57616, util=89.58%

# Konfiguracni soubor SYNC IO RANDOM ACCESS
andromeda /opt # cat random-read-test.fio
; random read of 128mb of data

[random-read]
rw=randread
size=4096m
directory=/opt/fio-test

# ASYNC AIO RANDOM ACCESS
andromeda /opt # fio random-read-test-aio.fio
random-read: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=8
fio-2.15
Starting 1 process
Jobs: 1 (f=1): [r(1)] [100.0% done] [338.2MB/0KB/0KB /s] [86.6K/0/0 iops] [eta 00m:00s]
random-read: (groupid=0, jobs=1): err= 0: pid=11209: Wed Sep 20 18:17:49 2017
read : io=4096.0MB, bw=329120KB/s, iops=82279, runt= 12744msec
slat (usec): min=2, max=93, avg= 3.17, stdev= 1.73
clat (usec): min=28, max=23455, avg=87.64, stdev=80.48
lat (usec): min=31, max=23458, avg=90.94, stdev=80.50
clat percentiles (usec):
| 1.00th=[ 57], 5.00th=[ 71], 10.00th=[ 73], 20.00th=[ 74],
| 30.00th=[ 76], 40.00th=[ 78], 50.00th=[ 82], 60.00th=[ 88],
| 70.00th=[ 91], 80.00th=[ 95], 90.00th=[ 108], 95.00th=[ 124],
| 99.00th=[ 155], 99.50th=[ 169], 99.90th=[ 209], 99.95th=[ 243],
| 99.99th=[ 2448]
lat (usec) : 50=0.01%, 100=85.59%, 250=14.36%, 500=0.02%, 750=0.01%
lat (usec) : 1000=0.01%
lat (msec) : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.01%
cpu : usr=17.83%, sys=36.17%, ctx=507915, majf=0, minf=58
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=100.0%, 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=0.1%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued : total=r=104857­6/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=8

Run status group 0 (all jobs):
READ: io=4096.0MB, aggrb=329119KB/s, minb=329119KB/s, maxb=329119KB/s, mint=12744msec, maxt=12744msec

Disk stats (read/write):
nvme0n1: ios=1040194/0, merge=0/0, ticks=84617/0, in_queue=84553, util=93.80%

# Konfiguracni soubor ASYNC IO RANDOM ACCESS
andromeda /opt # cat random-read-test-aio.fio
[random-read]
rw=randread
size=4096m
directory=/opt/fio-test
ioengine=libaio
iodepth=8
direct=1
invalidate=1
andromeda /opt #

Takze tady vydime rozdil ~64MB/s synchroniho IO vs ~330MB/s asynchroniho IO.

================
No a nakonec jeste rychly test multithread pristupu, na masince mam 32 threadu (16 fyzickych jader), takze nasimuluju:
4x pametove namapovany dotazovaci enginy
1x aktualizacni thread - simulujici zurnalovani souboroveho systemu
2x background updater - simulujici cteni a zapis najednou nastaveny na 20, resp. 40 microsekund pauzy, ktere simuluje (je to dummy test) nejaky processing dat napr., velikost dat kazdeho threadu je 32, resp. 64mb

A vysledek:
andromeda /opt # fio seven-threads-randio.fio
bgwriter: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=32
queryA: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=mmap, iodepth=1
queryB: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=mmap, iodepth=1
queryC: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=mmap, iodepth=1
queryD: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=mmap, iodepth=1
bgupdaterA: (g=0): rw=randrw, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=16
bgupdaterB: (g=0): rw=randrw, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=16
fio-2.15
Starting 7 processes
queryC: Laying out IO file(s) (1 file(s) / 4096MB)
queryD: Laying out IO file(s) (1 file(s) / 4096MB)
bgupdaterA: Laying out IO file(s) (1 file(s) / 32MB)
bgupdaterB: Laying out IO file(s) (1 file(s) / 64MB)
Jobs: 1 (f=1): [_(2),r(1),_(4)] [100.0% done] [35323KB/0KB/0KB /s] [8830/0/0 iops] [eta 00m:00s]
bgwriter: (groupid=0, jobs=1): err= 0: pid=11772: Wed Sep 20 18:34:23 2017
write: io=4096.0MB, bw=669910KB/s, iops=167477, runt= 6261msec
slat (usec): min=2, max=63, avg= 4.69, stdev= 2.18
clat (usec): min=18, max=6017, avg=185.43, stdev=35.27
lat (usec): min=23, max=6020, avg=190.23, stdev=35.38
clat percentiles (usec):
| 1.00th=[ 171], 5.00th=[ 171], 10.00th=[ 173], 20.00th=[ 175],
| 30.00th=[ 177], 40.00th=[ 177], 50.00th=[ 181], 60.00th=[ 185],
| 70.00th=[ 191], 80.00th=[ 197], 90.00th=[ 205], 95.00th=[ 213],
| 99.00th=[ 231], 99.50th=[ 239], 99.90th=[ 278], 99.95th=[ 342],
| 99.99th=[ 390]
lat (usec) : 20=0.01%, 50=0.01%, 100=0.01%, 250=99.79%, 500=0.20%
lat (msec) : 10=0.01%
cpu : usr=21.49%, sys=78.40%, ctx=7, majf=0, minf=12
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=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=0.1%, 64=0.0%, >=64=0.0%
issued : total=r=0/w=10­48576/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=32
queryA: (groupid=0, jobs=1): err= 0: pid=11773: Wed Sep 20 18:34:23 2017
read : io=4096.0MB, bw=41277KB/s, iops=10319, runt=101613msec
clat (usec): min=66, max=5590, avg=92.93, stdev=84.01
lat (usec): min=66, max=5591, avg=92.98, stdev=84.01
clat percentiles (usec):
| 1.00th=[ 72], 5.00th=[ 79], 10.00th=[ 79], 20.00th=[ 80],
| 30.00th=[ 81], 40.00th=[ 82], 50.00th=[ 84], 60.00th=[ 89],
| 70.00th=[ 95], 80.00th=[ 97], 90.00th=[ 100], 95.00th=[ 106],
| 99.00th=[ 143], 99.50th=[ 197], 99.90th=[ 1848], 99.95th=[ 2224],
| 99.99th=[ 2576]
lat (usec) : 100=89.32%, 250=10.25%, 500=0.17%, 750=0.06%, 1000=0.03%
lat (msec) : 2=0.11%, 4=0.08%, 10=0.01%
cpu : usr=5.49%, sys=8.59%, ctx=1048668, majf=1048576, minf=94
IO 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 : total=r=104857­6/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=1
queryB: (groupid=0, jobs=1): err= 0: pid=11774: Wed Sep 20 18:34:23 2017
read : io=4096.0MB, bw=40250KB/s, iops=10062, runt=104207msec
clat (usec): min=17, max=5694, avg=93.18, stdev=84.29
lat (usec): min=17, max=5694, avg=93.21, stdev=84.29
clat percentiles (usec):
| 1.00th=[ 73], 5.00th=[ 78], 10.00th=[ 79], 20.00th=[ 80],
| 30.00th=[ 81], 40.00th=[ 82], 50.00th=[ 85], 60.00th=[ 90],
| 70.00th=[ 95], 80.00th=[ 97], 90.00th=[ 101], 95.00th=[ 106],
| 99.00th=[ 141], 99.50th=[ 189], 99.90th=[ 1800], 99.95th=[ 2224],
| 99.99th=[ 2608]
lat (usec) : 20=0.01%, 50=0.01%, 100=87.76%, 250=11.82%, 500=0.16%
lat (usec) : 750=0.05%, 1000=0.03%
lat (msec) : 2=0.11%, 4=0.08%, 10=0.01%
cpu : usr=7.93%, sys=8.39%, ctx=1048689, majf=1048576, minf=62
IO 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 : total=r=104857­6/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=1
queryC: (groupid=0, jobs=1): err= 0: pid=11775: Wed Sep 20 18:34:23 2017
read : io=4096.0MB, bw=47849KB/s, iops=11962, runt= 87658msec
clat (usec): min=57, max=6160, avg=78.94, stdev=85.48
lat (usec): min=57, max=6160, avg=78.98, stdev=85.49
clat percentiles (usec):
| 1.00th=[ 60], 5.00th=[ 61], 10.00th=[ 62], 20.00th=[ 62],
| 30.00th=[ 63], 40.00th=[ 64], 50.00th=[ 67], 60.00th=[ 78],
| 70.00th=[ 81], 80.00th=[ 85], 90.00th=[ 96], 95.00th=[ 101],
| 99.00th=[ 135], 99.50th=[ 213], 99.90th=[ 1816], 99.95th=[ 2224],
| 99.99th=[ 2576]
lat (usec) : 100=94.35%, 250=5.20%, 500=0.18%, 750=0.05%, 1000=0.03%
lat (msec) : 2=0.11%, 4=0.08%, 10=0.01%
cpu : usr=7.62%, sys=9.23%, ctx=1048640, majf=1048576, minf=48
IO 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 : total=r=104857­6/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=1
queryD: (groupid=0, jobs=1): err= 0: pid=11776: Wed Sep 20 18:34:23 2017
read : io=4096.0MB, bw=54710KB/s, iops=13677, runt= 76664msec
clat (usec): min=57, max=6988, avg=70.45, stdev=86.49
lat (usec): min=57, max=6988, avg=70.48, stdev=86.49
clat percentiles (usec):
| 1.00th=[ 60], 5.00th=[ 61], 10.00th=[ 61], 20.00th=[ 62],
| 30.00th=[ 62], 40.00th=[ 63], 50.00th=[ 63], 60.00th=[ 64],
| 70.00th=[ 65], 80.00th=[ 66], 90.00th=[ 71], 95.00th=[ 83],
| 99.00th=[ 124], 99.50th=[ 213], 99.90th=[ 1848], 99.95th=[ 2224],
| 99.99th=[ 2544]
lat (usec) : 100=97.17%, 250=2.38%, 500=0.18%, 750=0.05%, 1000=0.03%
lat (msec) : 2=0.11%, 4=0.08%, 10=0.01%
cpu : usr=5.58%, sys=10.84%, ctx=1048637, majf=1048576, minf=156
IO 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 : total=r=104857­6/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=1
bgupdaterA: (groupid=0, jobs=1): err= 0: pid=11777: Wed Sep 20 18:34:23 2017
read : io=16824KB, bw=17955KB/s, iops=4488, runt= 937msec
slat (usec): min=3, max=35, avg= 4.58, stdev= 2.26
clat (usec): min=52, max=3446, avg=160.21, stdev=290.90
lat (usec): min=58, max=3450, avg=165.03, stdev=290.86
clat percentiles (usec):
| 1.00th=[ 55], 5.00th=[ 56], 10.00th=[ 57], 20.00th=[ 58],
| 30.00th=[ 59], 40.00th=[ 62], 50.00th=[ 71], 60.00th=[ 89],
| 70.00th=[ 119], 80.00th=[ 179], 90.00th=[ 310], 95.00th=[ 402],
| 99.00th=[ 1928], 99.50th=[ 2288], 99.90th=[ 3024], 99.95th=[ 3248],
| 99.99th=[ 3440]
write: io=15944KB, bw=17016KB/s, iops=4254, runt= 937msec
slat (usec): min=3, max=48, avg= 5.29, stdev= 2.64
clat (usec): min=4, max=102, avg=13.30, stdev= 4.47
lat (usec): min=15, max=110, avg=18.76, stdev= 5.32
clat percentiles (usec):
| 1.00th=[ 9], 5.00th=[ 11], 10.00th=[ 12], 20.00th=[ 12],
| 30.00th=[ 12], 40.00th=[ 12], 50.00th=[ 13], 60.00th=[ 13],
| 70.00th=[ 13], 80.00th=[ 14], 90.00th=[ 14], 95.00th=[ 16],
| 99.00th=[ 37], 99.50th=[ 41], 99.90th=[ 81], 99.95th=[ 97],
| 99.99th=[ 102]
lat (usec) : 10=0.65%, 20=46.45%, 50=1.48%, 100=32.58%, 250=11.44%
lat (usec) : 500=5.52%, 750=0.65%, 1000=0.16%
lat (msec) : 2=0.63%, 4=0.45%
cpu : usr=18.80%, sys=6.41%, ctx=8182, majf=0, minf=8
IO depths : 1=99.8%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 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 : total=r=4206/w­=3986/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=16
bgupdaterB: (groupid=0, jobs=1): err= 0: pid=11778: Wed Sep 20 18:34:23 2017
read : io=32684KB, bw=7351.4KB/s, iops=1837, runt= 4446msec
slat (usec): min=2, max=35, avg= 4.15, stdev= 2.40
clat (usec): min=40, max=5188, avg=440.41, stdev=680.03
lat (usec): min=58, max=5191, avg=444.85, stdev=679.99
clat percentiles (usec):
| 1.00th=[ 55], 5.00th=[ 57], 10.00th=[ 57], 20.00th=[ 59],
| 30.00th=[ 61], 40.00th=[ 71], 50.00th=[ 102], 60.00th=[ 161],
| 70.00th=[ 294], 80.00th=[ 628], 90.00th=[ 1672], 95.00th=[ 2160],
| 99.00th=[ 2512], 99.50th=[ 2640], 99.90th=[ 4384], 99.95th=[ 5088],
| 99.99th=[ 5216]
write: io=32852KB, bw=7389.2KB/s, iops=1847, runt= 4446msec
slat (usec): min=3, max=32, avg= 4.94, stdev= 2.33
clat (usec): min=0, max=109, avg=13.04, stdev= 4.17
lat (usec): min=14, max=116, avg=18.08, stdev= 4.82
clat percentiles (usec):
| 1.00th=[ 10], 5.00th=[ 11], 10.00th=[ 11], 20.00th=[ 12],
| 30.00th=[ 12], 40.00th=[ 12], 50.00th=[ 13], 60.00th=[ 13],
| 70.00th=[ 13], 80.00th=[ 13], 90.00th=[ 14], 95.00th=[ 15],
| 99.00th=[ 23], 99.50th=[ 35], 99.90th=[ 87], 99.95th=[ 101],
| 99.99th=[ 109]
lat (usec) : 2=0.01%, 10=0.47%, 20=48.25%, 50=1.32%, 100=24.66%
lat (usec) : 250=8.94%, 500=5.20%, 750=1.76%, 1000=1.34%
lat (msec) : 2=4.72%, 4=3.27%, 10=0.06%
cpu : usr=15.43%, sys=2.25%, ctx=16378, majf=0, minf=9
IO depths : 1=99.9%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 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 : total=r=8171/w­=8213/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
latency : target=0, window=0, percentile=100.00%, depth=16

Run status group 0 (all jobs):
READ: io=16432MB, aggrb=161474KB/s, minb=7351KB/s, maxb=54710KB/s, mint=937msec, maxt=104207msec
WRITE: io=4143.7MB, aggrb=677703KB/s, minb=7389KB/s, maxb=669909KB/s, mint=937msec, maxt=6261msec

Disk stats (read/write):
nvme0n1: ios=4205750/1­060793, merge=0/64, ticks=313136/11710, in_queue=325124, util=99.10%

# Konfiguracni soubor multithreaded testu:
andromeda /opt # cat four-threads-randio.fio
; seven threads, two query, two writers.

[global]
rw=randread
size=4096m
directory=/opt/fio-test
ioengine=libaio
iodepth=4
invalidate=1
direct=1

[bgwriter]
rw=randwrite
iodepth=32

[queryA]
iodepth=1
ioengine=mmap
direct=0
thinktime=3

[queryB]
iodepth=1
ioengine=mmap
direct=0
thinktime=5

[queryC]
iodepth=1
ioengine=mmap
direct=0
thinktime=4

[queryD]
iodepth=1
ioengine=mmap
direct=0
thinktime=2

[bgupdaterA]
rw=randrw
iodepth=16
thinktime=20
size=32m

[bgupdaterB]
rw=randrw
iodepth=16
thinktime=40
size=64m

Asynchroni IO je rozhodne posilou prutoku dat, to plati obecne v jakem koli systemu a na fyzickem IO nejde o vyjimku.

=============­======================
=== Summary: ===
=============­======================

Takze s timhle detatkem od Dellu si muzete postavit super rychle pole o velikost 4-8TB (vyssi plati pokud pouzijete 2TB disky nvme, ale to je garda za bratru 17,000 CZK za jeden.).

Slyšel už jste o službách jako Pastebin?

HDD is the new tape...

Moc nechápu titulky těchto článků – tentokrát „GTK+ 4.0 přijde až v roce 2019“ a přitom o GTK je tu jedna věta v sekci „Krátce“. A to není poprvé. Kdo ty titulky vymýšlí? Je za tím podobná myšlenka jako za sobotními komixy? Samé otázky…

Mám GTK radši, je příjemnější. QT se mi prostě nikdá nelíbilo.

subjektivní věc. Osobně se také stavím na stranu Qt. Gtk se mi nikdy nelíbilo. A evidentně si to myslí mnohem více lidí. Viz třeba desktop prostředí Budgie - má být od verze 11 založeno na Qt.

No, třeba kvůli podpoře jazyků. GTK+ má díky GObject Introspection podporu pro řadu jazyků. Stačí si vybrat. Qt? To plnohodnotně podporuje víceméně jenom C++. Ano, existují věci jako PyQt, ale člověk potom zjistí, že tam je hromada problémů, nejde to plnohodnotně portovat na další systémy atd.