Lilux-info March 2023

lilux-info@lilux.lu

5 participants
5 discussions

by Brent Frère

M. Ashbrook, qui habite à Arlon et est membre (dit-il) de notre association, désire rencontrer l'un de nos membres pour l'aider à installer un Linux sur son laptop. Tél: +352 691 319971 Si quelqu'un veut bien l'appeler et s'en occuper, merci de nous en informer sur cette boite e-mail. Merci d'avance.

10 months, 1 week

Gull Luxembourg - presentation bcache

by Frederic Dumas

Bonjour Alain, Pour la réunion du 11 avril du gull de Luxembourg, ce ne m'est pas possible de présenter un travail abouti sur bcache (mnémotechnique des commandes, optimisation avec le strip choisi pour le RAID, benchmark réel avec fio). En particulier, je n'avais jamais été capable d'expliquer certaines mesures de performances obtenues avec l'utilitaire fio, alors que c'est le coeur du sujet. Il me faut donc consacrer de nouveau deux ou trois jours pour remonter une machine de test. Deux options s'offrent à nous: reporter à plus tard cette présentation; accepter cette présentation "en l'état", dans un esprit d'entre-aide et collaboratif, basée sur mes notes de l'époque, avec de possibles trous de mémoire, c'est à dire un travail partiel sans garantie hélas d'exactitude. Je te laisse la décision et me réjouis de vous retrouver le 11 avril, quel que soit le sujet de la réunion. Bien amicalement, Frédéric. -- f.dumas(a)ellis.siteparc.fr > Début du message réexpédié : > > De: Frédéric Dumas <f.dumas(a)ellis.siteparc.fr> > Objet: Bcache on Dell R710 + P3700 - Benchmark > Date: 18 novembre 2021 à 17:24:53 UTC+2 > À: Brent Frère <Brent.Frere(a)AbilIT.eu> > Cc: Michał Rokitiański <michal.rokitianski(a)softq.pl> > > > Here are some benchmark results on bcache running on Dell R710 + PERC H700 + P3700 NVMe. > > > > > - ! - Setup > > > > Backend device: 6 x HDD SATA 3Gbps in RAID6 hardware (PERC H700 aka LSI MegaRAID SAS 9260-8i) > HDD sector size = 512 bytes > RAID6 stride = stripe element size = 1024KB > RAID6 stripe width = 4096KB > bcache --data-offset 8192 (sectors) > > Cache device : 2 x P3700 NVme in RAID1 software (md) > > > Configuration of bcache: > > Sequential reads through bcache # echo 0 > /sys/block/bcache0/bcache/sequential_cutoff > Writeback by bcache # echo writeback > /sys/block/bcache0/bcache/cache_mode > > > Hints: > > > # smartctl -iA -d megaraid,{0,5} /dev/sda > > gives access to the smart values of the disks running behind the hardware RAID controller. > > > # make-bcache --data-offset 8192 --bucket 2048k --writeback --bdev /dev/sda4 --cache /dev/md3700 > > attaches the cache device to the backend device and registers the /dev/bcach0 device. > > > #root@softq-pve-710:~# lsblk > NAME SIZE FSTYPE TYPE MOUNTPOINT > sda 7.3T disk > ├─sda1 1007K part > ├─sda2 512M vfat part > ├─sda3 31.5G LVM2_member part > │ └─pve-root 7.8G ext4 lvm / > └─sda4 7.2T bcache part > └─bcache0 7.2T disk > sr0 1024M rom > nvme0n1 745.2G disk > └─md3700 745.1G bcache raid1 > └─bcache0 7.2T disk > nvme1n1 745.2G disk > └─md3700 745.1G bcache raid1 > └─bcache0 7.2T disk > > > > > - 2 - Summary > > > > Bcache delivers a x11 performance boost on 64KB random read/writes. It delivers a sustained x2 performance boost on 64KB chunks sequential reads; a modest result, as these reads are already accelerated by the hardware raid controller's read-ahead policy. Bcache delivers no performance boost at all on fully random 64KB reads, as they are spread over a very large 7.2TB space. Likely, such a test should be completed on a few dozen GB large file, not on an entire volume. > > > Sequential reads without bcache (adaptative read ahead on hardware raid controller) > > 1.1 ~655MiB/s ~10.5k IOPS > > Sequential reads with bcache (adaptative read ahead on hardware raid controller) > > 1.2 ~1303MiB/s ~20.9k IOPS > > > Random reads without bcache (adaptative read ahead on hardware raid controller) > > 2.1 ~45.5MiB/s ~728 IOPS > > Random reads with bcache (adaptative read ahead on hardware raid controller) > > 2.2 ~45.9MiB/s ~733 IOPS > > > Random read/writes without bcache (adaptative read ahead on hardware raid controller) > > 3.1 ~6.0MiB/s ~93 IOPS > > Random read/writes with bcache (adaptative read ahead on hardware raid controller) > > 3.2 ~67.9MiB/s (R) ~1086 IOPS > 3.2 ~68.1MiB/s (W) ~1086 IOPS > > > Once the last read/write test was completed, it took several minutes to bcache to write the data back to the RAID6 array. > > > > - 3 - Full results > > > > Source: > https://docs.oracle.com/en-us/iaas/Content/Block/References/samplefiocomman… > > > > 1.1 - Throughput Performance Test - sequential reads - WITH ADAPTIVE READ AHEAD HARDWARE CACHE + WITHOUT BCACHE > > > > root@softq-pve-710:~# fio --filename=/dev/sda4 --direct=1 --rw=read --bs=64k --ioengine=libaio --iodepth=32 --runtime=120 --numjobs=4 --time_based --group_reporting --name=throughput-test-job --eta-newline=1 --readonly > > > > throughput-test-job: (groupid=0, jobs=4): err= 0: pid=1009110: Thu Nov 18 12:14:25 2021 > read: IOPS=10.5k, BW=655MiB/s (687MB/s)(76.7GiB/120012msec) > slat (usec): min=5, max=253, avg=20.03, stdev= 5.96 > clat (usec): min=106, max=232703, avg=12192.72, stdev=10140.66 > lat (usec): min=122, max=232718, avg=12213.20, stdev=10140.72 > clat percentiles (usec): > | 1.00th=[ 457], 5.00th=[ 1401], 10.00th=[ 2311], 20.00th=[ 3851], > | 30.00th=[ 5211], 40.00th=[ 7570], 50.00th=[ 10028], 60.00th=[ 12911], > | 70.00th=[ 16057], 80.00th=[ 19530], 90.00th=[ 24249], 95.00th=[ 29230], > | 99.00th=[ 41681], 99.50th=[ 48497], 99.90th=[ 84411], 99.95th=[125305], > | 99.99th=[204473] > bw ( KiB/s): min=287872, max=1654656, per=100.00%, avg=671072.94, stdev=31210.13, samples=956 > iops : min= 4498, max=25854, avg=10485.52, stdev=487.66, samples=956 > lat (usec) : 250=0.01%, 500=1.32%, 750=0.95%, 1000=1.11% > lat (msec) : 2=4.66%, 4=12.84%, 10=28.89%, 20=31.69%, 50=18.12% > lat (msec) : 100=0.35%, 250=0.08% > cpu : usr=2.95%, sys=10.94%, ctx=1069436, majf=0, minf=2128 > 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 rwts: total=1257420,0,0,0 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=655MiB/s (687MB/s), 655MiB/s-655MiB/s (687MB/s-687MB/s), io=76.7GiB (82.4GB), run=120012-120012msec > > Disk stats (read/write): > sda: ios=1255705/246, merge=254/64, ticks=15282727/6083, in_queue=15288810, util=99.99% > > > > > 1.2 - Throughput Performance Test - sequential reads - WITH ADAPTIVE READ AHEAD HARDWARE CACHE + WITH BCACHE > > > > root@softq-pve-710:~# fio --filename=/dev/bcache0 --direct=1 --rw=read --bs=64k --ioengine=libaio --iodepth=32 --runtime=120 --numjobs=4 --time_based --group_reporting --name=throughput-test-job --eta-newline=1 --readonly > > > > throughput-test-job: (groupid=0, jobs=4): err= 0: pid=1027176: Thu Nov 18 14:42:06 2021 > read: IOPS=20.9k, BW=1303MiB/s (1367MB/s)(153GiB/120038msec) > slat (usec): min=7, max=39687, avg=138.05, stdev=199.59 > clat (usec): min=54, max=755004, avg=5996.18, stdev=11372.86 > lat (usec): min=74, max=755048, avg=6134.93, stdev=11369.60 > clat percentiles (usec): > | 1.00th=[ 416], 5.00th=[ 2442], 10.00th=[ 3261], 20.00th=[ 3884], > | 30.00th=[ 4228], 40.00th=[ 4555], 50.00th=[ 4817], 60.00th=[ 5145], > | 70.00th=[ 5538], 80.00th=[ 5997], 90.00th=[ 6915], 95.00th=[ 9896], > | 99.00th=[ 34866], 99.50th=[ 44827], 99.90th=[113771], 99.95th=[261096], > | 99.99th=[541066] > bw ( MiB/s): min= 48, max= 1701, per=100.00%, avg=1307.64, stdev=109.03, samples=956 > iops : min= 768, max=27222, avg=20921.69, stdev=1744.45, samples=956 > lat (usec) : 100=0.01%, 250=0.02%, 500=1.66%, 750=1.04%, 1000=0.30% > lat (msec) : 2=0.98%, 4=19.10%, 10=71.97%, 20=2.18%, 50=2.37% > lat (msec) : 100=0.25%, 250=0.06%, 500=0.05%, 750=0.01%, 1000=0.01% > cpu : usr=3.24%, sys=36.24%, ctx=3406755, majf=0, minf=34793 > 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 rwts: total=2503357,0,0,0 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=1303MiB/s (1367MB/s), 1303MiB/s-1303MiB/s (1367MB/s-1367MB/s), io=153GiB (164GB), run=120038-120038msec > > Disk stats (read/write): > bcache0: ios=2502109/0, merge=0/0, ticks=7149936/0, in_queue=7149936, util=99.86%, aggrios=1262209/1106438, aggrmerge=4/54, aggrticks=2461402/1258470, aggrin_queue=3719872, aggrutil=99.02% > sda: ios=2059550/295, merge=9/108, ticks=4031424/35305, in_queue=4066729, util=99.02% > md3700: ios=464868/2212581, merge=0/0, ticks=891380/2481636, in_queue=3373016, util=95.12%, aggrios=232423/2114558, aggrmerge=11/101552, aggrticks=398099/1256745, aggrin_queue=1654844, aggrutil=95.05% > nvme0n1: ios=238263/2115522, merge=12/100588, ticks=410475/1286394, in_queue=1696870, util=95.05% > nvme1n1: ios=226583/2113594, merge=10/102516, ticks=385723/1227097, in_queue=1612819, util=94.99% > > > > > 2.1 - Throughput Performance Test - random reads - WITH ADAPTIVE READ AHEAD HARDWARE CACHE + WITHOUT BCACHE > > > > root@softq-pve-710:~# fio --filename=/dev/sda4 --direct=1 --rw=randread --bs=64k --ioengine=libaio --iodepth=32 --runtime=120 --numjobs=4 --time_based --group_reporting --name=throughput-test-job --eta-newline=1 --readonly > > > > throughput-test-job: (groupid=0, jobs=4): err= 0: pid=1010415: Thu Nov 18 12:24:50 2021 > read: IOPS=728, BW=45.5MiB/s (47.7MB/s)(5474MiB/120290msec) > slat (usec): min=9, max=350, avg=23.57, stdev= 3.17 > clat (usec): min=164, max=2280.6k, avg=175684.34, stdev=159256.80 > lat (usec): min=187, max=2280.6k, avg=175708.55, stdev=159256.79 > clat percentiles (msec): > | 1.00th=[ 25], 5.00th=[ 31], 10.00th=[ 38], 20.00th=[ 54], > | 30.00th=[ 74], 40.00th=[ 99], 50.00th=[ 127], 60.00th=[ 163], > | 70.00th=[ 207], 80.00th=[ 271], 90.00th=[ 380], 95.00th=[ 489], > | 99.00th=[ 760], 99.50th=[ 894], 99.90th=[ 1183], 99.95th=[ 1351], > | 99.99th=[ 1636] > bw ( KiB/s): min=33664, max=58368, per=100.00%, avg=46646.60, stdev=1045.77, samples=960 > iops : min= 526, max= 912, avg=728.84, stdev=16.35, samples=960 > lat (usec) : 250=0.01% > lat (msec) : 20=0.14%, 50=17.84%, 100=22.94%, 250=36.48%, 500=17.98% > lat (msec) : 750=3.58%, 1000=0.77%, 2000=0.27%, >=2000=0.01% > cpu : usr=0.36%, sys=1.04%, ctx=86189, majf=0, minf=2109 > IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=99.9%, >=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=87587,0,0,0 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=45.5MiB/s (47.7MB/s), 45.5MiB/s-45.5MiB/s (47.7MB/s-47.7MB/s), io=5474MiB (5740MB), run=120290-120290msec > > Disk stats (read/write): > sda: ios=87540/205, merge=0/62, ticks=15349921/28134, in_queue=15378056, util=99.99% > > > > > 2.2 - Throughput Performance Test - random reads - WITH ADAPTIVE READ AHEAD HARDWARE CACHE + WITH BCACHE > > > > root@softq-pve-710:~# fio --filename=/dev/bcache0 --direct=1 --rw=randread --bs=64k --ioengine=libaio --iodepth=32 --runtime=120 --numjobs=4 --time_based --group_reporting --name=throughput-test-job --eta-newline=1 --readonly > > > > throughput-test-job: (groupid=0, jobs=4): err= 0: pid=1030606: Thu Nov 18 14:55:16 2021 > read: IOPS=733, BW=45.9MiB/s (48.1MB/s)(5522MiB/120391msec) > slat (usec): min=21, max=6740, avg=58.67, stdev=90.27 > clat (usec): min=234, max=2413.0k, avg=174256.84, stdev=157810.22 > lat (usec): min=273, max=2413.1k, avg=174316.24, stdev=157809.87 > clat percentiles (msec): > | 1.00th=[ 23], 5.00th=[ 31], 10.00th=[ 37], 20.00th=[ 54], > | 30.00th=[ 73], 40.00th=[ 97], 50.00th=[ 127], 60.00th=[ 163], > | 70.00th=[ 207], 80.00th=[ 268], 90.00th=[ 372], 95.00th=[ 481], > | 99.00th=[ 760], 99.50th=[ 877], 99.90th=[ 1183], 99.95th=[ 1334], > | 99.99th=[ 1687] > bw ( KiB/s): min=33328, max=57955, per=100.00%, avg=47075.48, stdev=1075.87, samples=960 > iops : min= 520, max= 905, avg=734.54, stdev=16.81, samples=960 > lat (usec) : 250=0.01%, 500=0.44%, 750=0.06%, 1000=0.01% > lat (msec) : 2=0.01%, 4=0.01%, 20=0.18%, 50=17.58%, 100=22.79% > lat (msec) : 250=36.41%, 500=18.09%, 750=3.40%, 1000=0.79%, 2000=0.23% > lat (msec) : >=2000=0.01% > cpu : usr=0.31%, sys=1.98%, ctx=87526, majf=0, minf=2105 > IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=99.9%, >=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=88357,0,0,0 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=45.9MiB/s (48.1MB/s), 45.9MiB/s-45.9MiB/s (48.1MB/s-48.1MB/s), io=5522MiB (5791MB), run=120391-120391msec > > Disk stats (read/write): > bcache0: ios=88357/0, merge=0/0, ticks=15365196/0, in_queue=15365196, util=100.00%, aggrios=44195/44624, aggrmerge=0/26, aggrticks=7679901/20858, aggrin_queue=7700759, aggrutil=100.00% > sda: ios=87899/210, merge=0/53, ticks=15359634/28724, in_queue=15388358, util=100.00% > md3700: ios=492/89038, merge=0/0, ticks=168/12992, in_queue=13160, util=98.35%, aggrios=246/89109, aggrmerge=0/668, aggrticks=98/9289, aggrin_queue=9388, aggrutil=98.16% > nvme0n1: ios=489/89108, merge=0/670, ticks=196/8879, in_queue=9075, util=98.16% > nvme1n1: ios=3/89111, merge=0/667, ticks=1/9700, in_queue=9702, util=98.15% > > > > > 3.1 - Throughput Performance Test - random read/writes - WITH ADAPTIVE READ AHEAD HARDWARE CACHE + WITHOUT BCACHE > > > > root@softq-pve-710:~# fio --filename=/dev/sda4 --direct=1 --rw=randrw --bs=64k --ioengine=libaio --iodepth=32 --runtime=120 --numjobs=4 --time_based --group_reporting --name=throughput-test-job --eta-newline=1 > > > > throughput-test-job: (groupid=0, jobs=4): err= 0: pid=1011093: Thu Nov 18 12:30:15 2021 > read: IOPS=93, BW=5998KiB/s (6142kB/s)(707MiB/120737msec) > slat (usec): min=10, max=224, avg=25.81, stdev= 2.94 > clat (msec): min=11, max=4247, avg=347.85, stdev=434.68 > lat (msec): min=11, max=4247, avg=347.87, stdev=434.68 > clat percentiles (msec): > | 1.00th=[ 26], 5.00th=[ 34], 10.00th=[ 41], 20.00th=[ 55], > | 30.00th=[ 80], 40.00th=[ 118], 50.00th=[ 169], 60.00th=[ 243], > | 70.00th=[ 363], 80.00th=[ 592], 90.00th=[ 927], 95.00th=[ 1234], > | 99.00th=[ 1989], 99.50th=[ 2400], 99.90th=[ 3205], 99.95th=[ 3406], > | 99.99th=[ 4178] > bw ( KiB/s): min= 1152, max=12928, per=100.00%, avg=6014.06, stdev=506.65, samples=960 > iops : min= 18, max= 202, avg=93.97, stdev= 7.92, samples=960 > write: IOPS=96, BW=6204KiB/s (6353kB/s)(732MiB/120737msec); 0 zone resets > slat (usec): min=13, max=294, avg=31.81, stdev= 4.31 > clat (msec): min=114, max=5783, avg=983.56, stdev=411.47 > lat (msec): min=114, max=5783, avg=983.60, stdev=411.47 > clat percentiles (msec): > | 1.00th=[ 376], 5.00th=[ 510], 10.00th=[ 584], 20.00th=[ 676], > | 30.00th=[ 760], 40.00th=[ 827], 50.00th=[ 894], 60.00th=[ 969], > | 70.00th=[ 1083], 80.00th=[ 1217], 90.00th=[ 1502], 95.00th=[ 1770], > | 99.00th=[ 2433], 99.50th=[ 2702], 99.90th=[ 3440], 99.95th=[ 3943], > | 99.99th=[ 5269] > bw ( KiB/s): min= 1792, max=11520, per=99.87%, avg=6196.98, stdev=410.22, samples=960 > iops : min= 28, max= 180, avg=96.82, stdev= 6.41, samples=960 > lat (msec) : 20=0.07%, 50=8.43%, 100=9.20%, 250=12.28%, 500=9.98% > lat (msec) : 750=16.81%, 1000=20.10%, 2000=21.25%, >=2000=1.89% > cpu : usr=0.11%, sys=0.34%, ctx=22938, majf=0, minf=71 > IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.3%, 32=99.5%, >=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=11315,11704,0,0 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=5998KiB/s (6142kB/s), 5998KiB/s-5998KiB/s (6142kB/s-6142kB/s), io=707MiB (742MB), run=120737-120737msec > WRITE: bw=6204KiB/s (6353kB/s), 6204KiB/s-6204KiB/s (6353kB/s-6353kB/s), io=732MiB (767MB), run=120737-120737msec > > Disk stats (read/write): > sda: ios=11370/11806, merge=0/45, ticks=3916382/11605103, in_queue=15521484, util=99.99% > > > > > 3.2 - Throughput Performance Test - random read/writes - WITH ADAPTIVE READ AHEAD HARDWARE CACHE + WITH BCACHE > > > > root@softq-pve-710:~# fio --filename=/dev/bcache0 --direct=1 --rw=randrw --bs=64k --ioengine=libaio --iodepth=32 --runtime=120 --numjobs=4 --time_based --group_reporting --name=throughput-test-job --eta-newline=1 > > > > throughput-test-job: (groupid=0, jobs=4): err= 0: pid=1031738: Thu Nov 18 15:04:05 2021 > read: IOPS=1086, BW=67.9MiB/s (71.2MB/s)(8161MiB/120229msec) > slat (usec): min=15, max=86127, avg=51.75, stdev=568.52 > clat (usec): min=188, max=2007.7k, avg=116178.43, stdev=151824.06 > lat (usec): min=242, max=2007.7k, avg=116230.79, stdev=151836.54 > clat percentiles (usec): > | 1.00th=[ 441], 5.00th=[ 652], 10.00th=[ 832], > | 20.00th=[ 1385], 30.00th=[ 2999], 40.00th=[ 36439], > | 50.00th=[ 61604], 60.00th=[ 96994], 70.00th=[ 141558], > | 80.00th=[ 204473], 90.00th=[ 308282], 95.00th=[ 413139], > | 99.00th=[ 683672], 99.50th=[ 801113], 99.90th=[1082131], > | 99.95th=[1216349], 99.99th=[1535116] > bw ( KiB/s): min=30834, max=1256048, per=100.00%, avg=69675.99, stdev=38920.70, samples=957 > iops : min= 481, max=19625, avg=1087.75, stdev=608.16, samples=957 > write: IOPS=1089, BW=68.1MiB/s (71.4MB/s)(8190MiB/120229msec); 0 zone resets > slat (usec): min=14, max=50364, avg=47.67, stdev=339.27 > clat (usec): min=11, max=165668, avg=1454.15, stdev=2560.77 > lat (usec): min=74, max=165915, avg=1502.47, stdev=2590.82 > clat percentiles (usec): > | 1.00th=[ 71], 5.00th=[ 73], 10.00th=[ 80], 20.00th=[ 119], > | 30.00th=[ 135], 40.00th=[ 139], 50.00th=[ 145], 60.00th=[ 169], > | 70.00th=[ 1221], 80.00th=[ 3359], 90.00th=[ 5080], 95.00th=[ 6194], > | 99.00th=[ 8586], 99.50th=[ 9503], 99.90th=[14484], 99.95th=[21627], > | 99.99th=[26608] > bw ( KiB/s): min=23655, max=1247613, per=100.00%, avg=69995.69, stdev=39278.35, samples=957 > iops : min= 368, max=19493, avg=1092.74, stdev=613.74, samples=957 > lat (usec) : 20=0.01%, 50=0.01%, 100=7.71%, 250=25.16%, 500=1.76% > lat (usec) : 750=3.40%, 1000=3.65% > lat (msec) : 2=7.17%, 4=9.16%, 10=8.75%, 20=0.24%, 50=5.96% > lat (msec) : 100=7.50%, 250=12.11%, 500=5.94%, 750=1.17%, 1000=0.24% > lat (msec) : 2000=0.08%, >=2000=0.01% > cpu : usr=0.76%, sys=3.07%, ctx=225226, majf=1, minf=10344 > 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 rwts: total=130582,131041,0,0 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=67.9MiB/s (71.2MB/s), 67.9MiB/s-67.9MiB/s (71.2MB/s-71.2MB/s), io=8161MiB (8558MB), run=120229-120229msec > WRITE: bw=68.1MiB/s (71.4MB/s), 68.1MiB/s-68.1MiB/s (71.4MB/s-71.4MB/s), io=8190MiB (8588MB), run=120229-120229msec > > Disk stats (read/write): > bcache0: ios=130619/131041, merge=0/0, ticks=15128128/174484, in_queue=15302612, util=100.00%, aggrios=65454/110552, aggrmerge=0/34, aggrticks=7565070/131037, aggrin_queue=7696107, aggrutil=99.57% > sda: ios=86501/300, merge=0/68, ticks=15072824/78563, in_queue=15151387, util=99.57% > md3700: ios=44408/220805, merge=0/0, ticks=57316/183512, in_queue=240828, util=98.53%, aggrios=22202/221689, aggrmerge=0/548, aggrticks=28755/138402, aggrin_queue=167156, aggrutil=98.41% > nvme0n1: ios=22193/221688, merge=0/549, ticks=28763/138527, in_queue=167289, util=98.39% > nvme1n1: ios=22212/221690, merge=0/547, ticks=28747/138277, in_queue=167024, util=98.41% > > > > -- > Frédéric Dumas > f.dumas(a)ellis.siteparc.fr >

1 year, 1 month

Déclaration de revenus (impôts) 2022

by Alain Knaff

Salut tout le monde, Certains d'entre vous ont peut-être eu des difficultés à remplir leur déclaration de revenus sous Acrobat reader. En fait, la raison est qu'un certificat SSL d'Adobe a expiré... J'ai mis en place une petite page sur notre Wiki comment se débrouiller quand même: https://www.lilux.lu/mediawiki/AdobeAcrobatForms Suggestions d'amélioration / optimisation / simplifications bienvenues. Bonne lecture, Alain

1 year, 1 month

[Rappel] Linux "Keller" Meeting mensuel + présentation informatique quantique dans notre chatroom sur notre serveur Jitsi tous les 2e mardi du mois: 14 mars à 20:00

by Alain Knaff

Salut tout le monde, Étant donné que nos meetings LLL "Keller" sont tout le 2e mardi du mois, le prochain sera la semaine prochaine, mardi 14 mars à 20 heures, dans notre chatroom vidéo: https://jitsi.fonck.org.lu/lll Ce mois-ci, Brent nous présentera le premier module de sa série sur l'informatique quantique: "Introduction aux ordinateurs quantiques: états quantiques et portes 'logiques' " Début de la présentation à peu près 20:15, histoire d'attendre que tout le monde s'installe :-) Ceux qui arrivent encore plus tard rateront (une partie de) la présentation, mais resteront bien sûr les bienvenus pour la discussion libre habituelle qui suivra. Instructions pour participer: suivre le lien, et vous êtes dedans. Maintenant il faut juste encore activer votre micro et votre caméra en cliquant sur le symbole ad-hoc (en bas, milieu de la fenêtre). Pour ceux qui ne sont pas équipé en caméra, il est possible de se joindre en audio seulement, voire même en texte seul (bulle de dialogue "cartoon", 3e icône à gauche en bas de la fenêtre). Si jamais il y a un problème technique (par exemple si ne vous voyez la vidéo d'aucun autre participant, etc.) n'hésitez pas à le dire, si nécessaire par chat texte. Pierre ou moi-même pourront redémarrer le serveur, ou encore, tous ensemble on arrivera éventuellement à trouver / suggérer une solution. À mardi, Alain

1 year, 1 month

Virtual server recommendations

by Ed Moman

Hi guys, I am looking for an affordable Linux virtual server in order to deploy Python apps. Mostly Plotly/Dash. Any recommendations? Best, Ed

1 year, 2 months

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

Lilux-info March 2023