Hi Sunil I am running iostat on only one of the nodes, so the results you see is only from a single node. However I am running this concurrently on the 10 nodes, resulting in a total of 2Gig being written, so yes on this node it took 8 secs to write 205Megs.
My latest results (using sync after the dd) show that when running on the 10 nodes concurrently it take 37secs to write the 10 x 205Meg files (2Gig), Here are the results from ALL the nodes: run.sh.e7212.1:204800000 bytes (205 MB) copied, 17.9657 s, 11.4 MB/s run.sh.e7212.10:204800000 bytes (205 MB) copied, 30.1489 s, 6.8 MB/s run.sh.e7212.2:204800000 bytes (205 MB) copied, 16.4605 s, 12.4 MB/s run.sh.e7212.3:204800000 bytes (205 MB) copied, 18.1461 s, 11.3 MB/s run.sh.e7212.4:204800000 bytes (205 MB) copied, 20.9716 s, 9.8 MB/s run.sh.e7212.5:204800000 bytes (205 MB) copied, 22.6265 s, 9.1 MB/s run.sh.e7212.6:204800000 bytes (205 MB) copied, 12.9318 s, 15.8 MB/s run.sh.e7212.7:204800000 bytes (205 MB) copied, 15.1739 s, 13.5 MB/s run.sh.e7212.8:204800000 bytes (205 MB) copied, 13.8953 s, 14.7 MB/s run.sh.e7212.9:204800000 bytes (205 MB) copied, 29.5445 s, 6.9 MB/s real 0m37.920s user 0m0.000s sys 0m0.030s (This averages 11.17MB/sec per node, which seems very low.) compared to 23.5secs when writing 2Gig from a single node. r...@n2:# time (dd if=/dev/zero of=txt bs=2048000 count=1000; sync) 1000+0 records in 1000+0 records out 2048000000 bytes (2.0 GB) copied, 16.1369 s, 127 MB/s real 0m23.495s user 0m0.000s sys 0m15.180s Sunil, do you have any way to run the same test (10 x 200Megs) concurrently on 10 or more nodes to compare results? Thanks again Laurence Sunil Mushran wrote: > Always cc ocfs2-users. > > Strange. The ocfs2 numbers look incomplete. It shows only 200MB written. > You said it was taking 16 secs. Yet the iostat numbers are for 8 secs > only. > > The xfs numbers look complete. Shows 90+ MB/s. > > On my iscsi setup (netapp backend, gige, node with single cpu box and > 512M RAM), I get 85MB/s. > > # time (dd if=/dev/zero of=/mnt/boq7 count=2000 bs=1M ; sync ;) > sync > 2000+0 records in > 2000+0 records out > 2097152000 bytes (2.1 GB) copied, 24.4168 seconds, 85.9 MB/s > > real 0m24.515s > user 0m0.035s > sys 0m14.967s > > This is with data=writeback. > > The 2.2 secs is probably because of delayed allocation. Since your box > has > enough memory, xfs can cache all the writes and return to the user. Its > writeback then flushes the data in the background. The iostat/vmstat > numbers should show similar writeback numbers. > > Sunil > > Laurence Mayer wrote: >> >> iostat from cfs volume >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 1.77 2.28 0.00 95.95 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 4.00 2.00 4.00 16.00 64.00 >> 13.33 0.12 15.00 15.00 9.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 6.90 7.14 0.00 85.96 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 16.00 9.00 40.00 75.00 441.00 >> 10.53 0.43 9.39 6.73 33.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 7.67 7.18 0.00 85.15 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 20.00 11.00 47.00 88.00 536.00 >> 10.76 0.36 6.21 4.48 26.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 5.65 10.07 0.00 84.28 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 16.00 9.00 37.00 75.00 417.00 >> 10.70 0.55 11.96 8.48 39.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.25 0.00 12.69 31.22 0.00 55.84 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 40324.00 2.00 181.00 16.00 174648.00 >> 954.45 94.58 364.86 4.81 88.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 13.35 14.14 0.00 72.51 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 9281.00 1.00 228.00 11.00 224441.00 >> 980.14 100.93 559.17 4.37 100.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 0.25 0.50 0.00 99.25 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 0.00 0.00 3.00 0.00 1040.00 >> 346.67 0.03 240.00 6.67 2.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 0.00 0.00 0.00 100.00 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 0.00 1.00 1.00 11.00 1.00 >> 6.00 0.04 20.00 20.00 4.00 >> >> vmstat from cfs volume: >> procs -----------memory---------- ---swap-- -----io---- -system-- >> ----cpu---- >> r b swpd free buff cache si so bi bo in cs us >> sy id wa >> 0 0 0 447656 279416 15254408 0 0 0 0 39 350 >> 0 0 100 0 >> 0 0 0 447656 279416 15254408 0 0 5 21 61 358 >> 0 0 100 0 >> 0 0 0 447656 279416 15254408 0 0 0 0 49 369 >> 0 0 100 0 >> 0 0 0 447656 279416 15254408 0 0 6 0 28 318 >> 0 0 100 0 >> 0 0 0 447656 279416 15254408 0 0 0 0 26 321 >> 0 0 100 0 >> 0 0 0 447656 279416 15254408 0 0 5 1 45 339 >> 0 0 100 0 >> 0 0 0 447656 279416 15254412 0 0 0 0 8 283 >> 0 0 100 0 >> 0 1 0 439472 279424 15262604 0 0 14 80 93 379 >> 0 1 90 9 >> 0 0 0 439472 279424 15262604 0 0 0 4 43 338 >> 0 0 97 2 >> 0 0 0 382312 279456 15319964 0 0 37 209 208 562 >> 0 7 85 8 >> 0 0 0 324524 279500 15377292 0 0 44 264 250 647 >> 0 7 86 7 >> 0 0 0 266864 279532 15434636 0 0 38 208 213 548 >> 0 7 83 10 >> 0 3 0 250072 279544 15450584 0 0 44 124832 13558 >> 2038 0 11 62 27 >> 0 1 0 250948 279564 15450584 0 0 5 75341 19596 2735 >> 0 13 71 16 >> 0 0 0 252808 279564 15450548 0 0 0 52 2777 849 >> 0 2 95 3 >> 0 0 0 252808 279564 15450548 0 0 6 0 21 310 >> 0 0 100 0 >> 0 0 0 252808 279564 15450548 0 0 0 0 15 298 >> 0 0 100 0 >> 0 0 0 253012 279564 15450548 0 0 5 1 29 310 >> 0 0 100 0 >> 0 0 0 253048 279564 15450552 0 0 0 0 19 290 >> 0 0 100 0 >> 0 0 0 253048 279564 15450552 0 0 6 0 26 305 >> 0 0 100 0 >> 1 0 0 253172 279564 15450552 0 0 0 60 28 326 >> 0 0 100 0 >> >> >> xfs volume: >> iostat >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdd 0.00 0.00 4.00 0.00 40.00 0.00 >> 10.00 0.05 12.00 12.00 4.80 >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 14.98 0.25 0.00 84.77 >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdd 0.00 0.00 3.00 5.00 24.00 3088.00 >> 389.00 6.54 44.00 17.00 13.60 >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 10.67 21.86 0.00 67.47 >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdd 0.00 1.00 0.00 221.00 0.00 202936.00 >> 918.26 110.51 398.39 4.52 100.00 >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 4.92 21.84 0.00 73.23 >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdd 0.00 2.00 0.00 232.00 0.00 209152.00 >> 901.52 110.67 493.50 4.31 100.00 >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 3.67 22.78 0.00 73.54 >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdd 0.00 1.00 0.00 215.00 0.00 185717.00 >> 863.80 111.37 501.67 4.65 100.00 >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.12 0.00 6.24 12.61 0.00 81.02 >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdd 0.00 1.00 0.00 200.00 0.00 178456.00 >> 892.28 80.01 541.82 4.88 97.60 >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.12 0.00 4.61 8.34 0.00 86.92 >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdd 0.00 0.00 0.00 179.00 0.00 183296.00 >> 1024.00 134.56 470.61 5.21 93.20 >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 4.25 9.96 0.00 85.79 >> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s >> avgrq-sz avgqu-sz await svctm %util >> sdd 0.00 0.00 0.00 201.00 0.00 205824.00 >> 1024.00 142.86 703.92 4.98 100.00 >> >> >> >> vmstat >> procs -----------memory---------- ---swap-- -----io---- -system-- >> ----cpu---- >> r b swpd free buff cache si so bi bo in cs us >> sy id wa >> 1 0 45396 214592 6332 31771312 0 0 668 908 3 6 >> 3 2 92 3 >> 0 0 45396 214460 6332 31771336 0 0 0 0 14 4874 >> 0 0 100 0 >> 2 0 45396 161032 6324 31822524 0 0 20 0 42 6074 >> 0 13 87 0 >> 5 1 45396 166380 6324 31820072 0 0 12 77948 8166 6416 >> 0 16 77 7 >> 1 2 45396 163176 6324 31824580 0 0 28 102920 24190 >> 6660 0 6 73 21 >> 0 2 45396 163096 6332 31824580 0 0 0 102743 22576 >> 6700 0 5 72 23 >> 0 2 45396 163076 6332 31824580 0 0 0 90400 21831 6500 >> 0 4 76 21 >> 0 1 45396 163012 6332 31824580 0 0 0 114732 19686 >> 5894 0 7 83 10 >> 0 1 45396 162972 6332 31824580 0 0 0 98304 24882 6314 >> 0 4 87 8 >> 0 1 45396 163064 6332 31824580 0 0 0 98304 24118 6285 >> 0 4 84 12 >> 0 1 45396 163096 6340 31824576 0 0 0 114720 24800 >> 6166 0 4 87 9 >> 0 1 45396 162964 6340 31824584 0 0 0 98304 24829 6105 >> 0 3 85 12 >> 0 1 45396 162856 6340 31824584 0 0 0 98304 23506 6402 >> 0 5 83 12 >> 0 1 45396 162888 6340 31824584 0 0 0 114688 24685 >> 7057 0 4 87 9 >> 0 1 45396 162600 6340 31824584 0 0 0 98304 24902 7107 >> 0 4 86 10 >> 0 1 45396 162740 6340 31824584 0 0 0 98304 24906 7019 >> 0 4 91 6 >> 0 1 45396 162616 6348 31824584 0 0 0 114728 24997 >> 7169 0 4 86 9 >> 0 1 45396 162896 6348 31824584 0 0 0 98304 23700 6857 >> 0 4 85 11 >> 0 1 45396 162732 6348 31824584 0 0 0 94512 24468 6995 >> 0 3 89 8 >> 0 1 45396 162836 6348 31824584 0 0 0 81920 19764 6604 >> 0 7 81 11 >> 0 3 45396 162996 6348 31824584 0 0 0 114691 24303 >> 7270 0 4 81 14 >> procs -----------memory---------- ---swap-- -----io---- -system-- >> ----cpu---- >> r b swpd free buff cache si so bi bo in cs us >> sy id wa >> 0 1 45396 163160 6356 31824584 0 0 0 98332 22695 7174 >> 0 4 78 18 >> 0 1 45396 162848 6356 31824584 0 0 0 90549 24836 7347 >> 0 4 82 15 >> 1 0 45396 163092 6364 31824580 0 0 0 37 13990 6216 >> 0 6 83 11 >> 0 0 45396 163272 6364 31824588 0 0 0 320 65 3817 >> 0 0 100 0 >> 0 0 45396 163272 6364 31824588 0 0 0 0 8 3694 >> 0 0 100 0 >> 0 0 45396 163272 6364 31824588 0 0 0 0 25 3833 >> 0 0 100 0 >> 0 0 45396 163272 6364 31824588 0 0 0 1 13 3690 >> 0 0 100 0 >> >> >> >> >> >> On Mon, Sep 14, 2009 at 10:15 PM, Sunil Mushran >> <sunil.mush...@oracle.com <mailto:sunil.mush...@oracle.com>> wrote: >> >> Add a sync. Both utils are showing very little io. And do the same >> for runs on both ocfs2 and xfs. >> >> # dd if... ; sync; >> >> Laurence Mayer wrote: >> >> Here is the output of iostat while running the test on all the >> OCFS volume. >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.23 0.00 15.80 0.45 0.00 83.52 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s >> wsec/s avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 4.00 5.00 4.00 43.00 >> 57.00 11.11 0.08 8.89 8.89 8.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.28 0.00 4.46 0.00 0.00 95.26 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s >> wsec/s avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 0.00 0.00 0.00 0.00 >> 0.00 0.00 0.00 0.00 0.00 0.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.25 0.00 0.25 3.23 0.00 96.28 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s >> wsec/s avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 7.00 1.00 13.00 11.00 >> 153.00 11.71 0.24 17.14 11.43 16.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 0.00 0.00 0.00 100.00 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s >> wsec/s avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 0.00 0.00 0.00 0.00 >> 0.00 0.00 0.00 0.00 0.00 0.00 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.00 0.00 0.00 0.00 0.00 100.00 >> >> Device: rrqm/s wrqm/s r/s w/s rsec/s >> wsec/s avgrq-sz avgqu-sz await svctm %util >> sdc 0.00 0.00 1.00 1.00 11.00 >> 1.00 6.00 0.03 15.00 15.00 3.00 >> >> vmstat: >> procs -----------memory---------- ---swap-- -----io---- >> -system-- ----cpu---- >> r b swpd free buff cache si so bi bo in >> cs us sy id wa >> 0 0 0 54400 279320 15651312 0 0 9 8 2 >> 4 30 1 69 0 >> 0 0 0 54384 279320 15651316 0 0 6 0 24 >> 299 0 0 100 0 >> 0 0 0 54384 279320 15651316 0 0 0 0 92 >> 409 0 0 100 0 >> 2 0 0 54384 279320 15651316 0 0 5 1 81 >> 386 0 0 100 0 >> 0 0 0 53756 279320 15651352 0 0 8 0 730 >> 1664 0 1 99 0 >> 0 0 0 53232 279320 15651352 0 0 6 88 586 >> 1480 0 0 99 0 >> 0 0 0 242848 279320 15458608 0 0 8 0 348 >> 1149 0 3 97 0 >> 0 0 0 242868 279320 15458608 0 0 5 1 220 >> 721 0 0 100 0 >> 0 0 0 242868 279320 15458608 0 0 0 0 201 >> 709 0 0 100 0 >> 0 0 0 243116 279320 15458608 0 0 6 0 239 >> 775 0 0 100 0 >> 0 0 0 243116 279320 15458608 0 0 0 0 184 >> 676 0 0 100 0 >> 0 0 0 243116 279336 15458608 0 0 5 65 236 >> 756 0 0 99 0 >> 0 0 0 243488 279336 15458608 0 0 0 0 231 >> 791 0 0 100 0 >> 1 0 0 243488 279336 15458608 0 0 6 0 193 >> 697 0 1 100 0 >> 0 0 0 243488 279336 15458608 0 0 0 0 221 >> 762 0 0 100 0 >> 0 0 0 243860 279336 15458608 0 0 9 1 240 >> 793 0 0 100 0 >> 0 0 0 243860 279336 15458608 0 0 0 0 197 >> 708 0 0 100 0 >> 1 0 0 117384 279348 15585384 0 0 26 16 124 >> 524 0 15 84 1 >> 0 0 0 53204 279356 15651364 0 0 0 112 141 >> 432 0 8 91 1 >> 0 0 0 53212 279356 15651320 0 0 5 1 79 >> 388 0 0 100 0 >> 0 0 0 53212 279356 15651320 0 0 0 20 30 >> 301 0 0 100 0 >> Does this give you any clue to the bottle neck? >> On Mon, Sep 14, 2009 at 9:42 PM, Sunil Mushran >> <sunil.mush...@oracle.com <mailto:sunil.mush...@oracle.com> >> <mailto:sunil.mush...@oracle.com >> <mailto:sunil.mush...@oracle.com>>> wrote: >> >> Get some iostat/vmstat numbers. >> # iostat -x /dev/sdX 1 >> # vmstat 1 >> >> How much memory do the nodes have? If more than 2G, XFS >> is probably leveraging its delayed allocation feature to >> heavily >> cache the writes. iostat/vmstat should show that. >> >> Is the timing for the 10 node test cumulative? >> >> Laurence Mayer wrote: >> >> Hi, >> >> I am currently running a 10 Node OCFS2 Cluster (version >> 1.3.9-0ubuntu1) on Ubuntu Server 8.04 x86_64. >> Linux n1 2.6.24-24-server #1 SMP Tue Jul 7 19:39:36 UTC >> 2009 >> x86_64 GNU/Linux >> >> The Cluster is connected to a 1Tera iSCSI Device >> presented by >> an IBM 3300 Storage System, running over a 1Gig Network. >> Mounted on all nodes: /dev/sdc1 on /cfs1 type ocfs2 >> (rw,_netdev,data=writeback,heartbeat=local) >> Maximum Nodes: 32 >> Block Size=4k >> Cluster Size=4k >> >> My testing shows that to write simultaneously from the 10 >> nodes, 10 x 200Meg files (1 file per node, total of >> 2Gig) >> takes ~23.54secs. >> Reading the files back can take just as long. >> >> Do these numbers sound correct? >> >> Doing dd if=/dev/zero of=/cfs1/xxxxx/txt count=1000 >> bs=2048000 >> (2Gig) from a single node takes 16secs. >> >> (running the same dd command on an XFS filesystem >> connected to >> the same iSCSI Storage takes 2.2secs) >> >> Is there any tips & tricks to improve performance on >> OCFS2? >> >> Thanks in advance >> Laurence >> >> _______________________________________________ >> Ocfs2-users mailing list >> Ocfs2-users@oss.oracle.com >> <mailto:Ocfs2-users@oss.oracle.com> >> <mailto:Ocfs2-users@oss.oracle.com >> <mailto:Ocfs2-users@oss.oracle.com>> >> >> http://oss.oracle.com/mailman/listinfo/ocfs2-users >> >> >> >> > _______________________________________________ Ocfs2-users mailing list Ocfs2-users@oss.oracle.com http://oss.oracle.com/mailman/listinfo/ocfs2-users
