Thomas, You have not specified a block size, so you are doing a huge number of small(ish) reads with associated round trips. What happens with dd bs=128k ..? Jeff Anderson-Lee On 2/28/2013 5:30 PM, Thomas Wakefield wrote: > Did a fresh dd test just to confirm, same results: > > [root at cpu_crew1 benchmark]# dd if=/dev/zero > of=/shared/working/benchmark/test.cpucrew1 bs=512k count=10000 > 10000+0 records in > 10000+0 records out > 5242880000 bytes (5.2 GB) copied, 7.43695 seconds, 705 MB/s > [root at cpu_crew1 benchmark]# dd > if=/shared/working/benchmark/test.cpucrew1 of=/dev/null > 552126+0 records in > 552125+0 records out > 282688000 bytes (283 MB) copied, 37.8514 seconds, 7.5 MB/s > > > > On Feb 28, 2013, at 8:14 PM, Bryan Whitehead <driver at megahappy.net > <mailto:driver at megahappy.net>> wrote: > >> How are you doing the reading? Is this still an iozone benchmark? >> >> if you simply dd if=/glustermount/bigfile of=/dev/null, is the speed >> better? >> >> >> On Thu, Feb 28, 2013 at 5:05 PM, Thomas Wakefield <twake at iges.org >> <mailto:twake at iges.org>> wrote: >> >> I get great speed locally, it's only when I add gluster in that >> it slows down. I get 2GB/s locally to the exact same brick. >> It's gluster that is having the read issue (80MB/s). But >> Gluster can write just fine, 800MB/s. >> >> The blockdev idea is a good one, and I have already done it. >> Thanks though. >> >> -Tom >> >> On Feb 28, 2013, at 7:53 PM, Ling Ho <ling at slac.stanford.edu >> <mailto:ling at slac.stanford.edu>> wrote: >> >>> Tom, >>> >>> What type of disks do you have? If they are raid 5 or 6, have >>> you try setting the read-ahead size to 8192 or 16384 (blockdev >>> --setra 8192 /dev/<sd?> ? >>> >>> ... >>> ling >>> >>> On 02/28/2013 04:23 PM, Thomas Wakefield wrote: >>>> Did anyone else have any ideas on performance tuning for reads? >>>> >>>> On Feb 27, 2013, at 9:29 PM, Thomas Wakefield <twake at iges.org >>>> <mailto:twake at iges.org>> wrote: >>>> >>>>> Bryan- >>>>> >>>>> Yes I can write at 700-800MBytes/sec, but i can only read at >>>>> *70-80 MBytes/sec*. I would be very happy if I could get it >>>>> to read at the same speed it can write at. And the 70-80 is >>>>> sequential, not random for reads, same exact test commands on >>>>> the disk server are in the 2+GB/s range, so I know the disk >>>>> server can do it. >>>>> >>>>> -Tom >>>>> >>>>> >>>>> On Feb 27, 2013, at 7:41 PM, Bryan Whitehead >>>>> <driver at megahappy.net <mailto:driver at megahappy.net>> wrote: >>>>> >>>>>> Are your figures 700-800M*Byte*/sec? Because that is probably >>>>>> as fast as your 10G nic cards are able to do. You can test >>>>>> that by trying to push a large amount of data over nc or ftp. >>>>>> >>>>>> Might want to try Infiniband. 40G cards are pretty routine. >>>>>> >>>>>> >>>>>> On Wed, Feb 27, 2013 at 3:45 PM, Thomas Wakefield >>>>>> <twake at iges.org <mailto:twake at iges.org>> wrote: >>>>>> >>>>>> I also get the same performance running iozone for large >>>>>> file sizes, iozone -u 1 -r 512k -s 2G -I -F. >>>>>> >>>>>> Large file IO is what I need the system to do. I am just >>>>>> shocked at the huge difference between local IO and >>>>>> gluster client IO. I know there should be some >>>>>> difference, but 10x is unacceptable. >>>>>> >>>>>> -Tom >>>>>> >>>>>> >>>>>> >>>>>> On Feb 27, 2013, at 5:31 PM, Bryan Whitehead >>>>>> <driver at megahappy.net <mailto:driver at megahappy.net>> wrote: >>>>>> >>>>>>> Every time you open/close a file or a directory you will >>>>>>> have to wait for locks which take time. This is totally >>>>>>> expected. >>>>>>> >>>>>>> Why don't you share what you want to do? iozone >>>>>>> benchmarks look like crap but serving qcow2 files to >>>>>>> qemu works fantastic for me. What are you doing? Make a >>>>>>> benchmark that does that. If you are going to have many >>>>>>> files with a wide variety of sizes glusterfs/fuse might >>>>>>> not be what you are looking for. >>>>>>> >>>>>>> >>>>>>> On Wed, Feb 27, 2013 at 12:56 PM, Thomas Wakefield >>>>>>> <twake at cola.iges.org <mailto:twake at cola.iges.org>> wrote: >>>>>>> >>>>>>> I have tested everything, small and large files. I >>>>>>> have used file sizes ranging from 128k up to >>>>>>> multiple GB files. All the reads are bad. >>>>>>> >>>>>>> >>>>>>> >>>>>>> Here is a fairly exhaustive iozone auto test: >>>>>>> >>>>>>> random random bkwd record stride >>>>>>> KB reclen write rewrite read reread read >>>>>>> write read rewrite read fwrite frewrite fread >>>>>>> freread >>>>>>> 64 4 40222 63492 26868 30060 1620 >>>>>>> 71037 1572 70570 31294 77096 72475 14736 >>>>>>> 13928 >>>>>>> 64 8 99207 116366 13591 13513 3214 >>>>>>> 97690 3155 109978 28920 152018 158480 >>>>>>> 18936 17625 >>>>>>> 64 16 230257 253766 25156 28713 10867 >>>>>>> 223732 8873 244297 54796 303383 312204 >>>>>>> 15062 13545 >>>>>>> 64 32 255943 234481 5735102 7100397 >>>>>>> 11897 318502 13681 347801 24214 695778 528618 >>>>>>> 25838 28094 >>>>>>> 64 64 214096 681644 6421025 7100397 >>>>>>> 27453 292156 28117 621657 27338 376062 512471 >>>>>>> 28569 32534 >>>>>>> 128 4 74329 75468 26428 >>>>>>> <tel:75468%20%C2%A0%20%C2%A026428> 41089 1131 >>>>>>> 72857 1118 66976 1597 73778 78343 13351 >>>>>>> 13026 >>>>>>> 128 8 100862 135170 24966 >>>>>>> <tel:135170%20%C2%A0%20%C2%A024966> 16734 2617 >>>>>>> 118966 2560 120406 39156 125121 146613 >>>>>>> 16177 16180 >>>>>>> 128 16 115114 253983 28212 17854 5307 >>>>>>> 246180 5431 229843 47335 255920 271173 >>>>>>> 27256 24445 >>>>>>> 128 32 256042 391360 39848 64258 11329 >>>>>>> 290230 9905 429563 38176 490380 463696 >>>>>>> 20917 19219 >>>>>>> 128 64 248573 592699 4557257 6812590 >>>>>>> 19583 452366 29263 603357 42967 814915 692017 >>>>>>> 76327 37604 >>>>>>> 128 128 921183 526444 5603747 5379161 >>>>>>> 45614 390222 65441 826202 41384 662962 1040839 >>>>>>> 78526 39023 >>>>>>> 256 4 76212 77337 40295 >>>>>>> <tel:77337%20%C2%A0%20%C2%A040295> 32125 1289 >>>>>>> 71866 1261 64645 1436 57309 53048 23073 >>>>>>> 29550 >>>>>>> 256 8 126922 141976 26237 >>>>>>> <tel:141976%20%C2%A0%20%C2%A026237> 25130 2566 >>>>>>> 128058 2565 138981 2985 125060 133603 >>>>>>> 22840 24955 >>>>>>> 256 16 242883 263636 41850 24371 4902 >>>>>>> 250009 5290 248792 89353 243821 247303 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798827 50898 799492 55679 801849 800917 >>>>>>> 92778 82686 >>>>>>> 524288 2048 780594 834612 19936 19994 63147 >>>>>>> 769555 63007 802512 66322 772900 771314 >>>>>>> 86628 93485 >>>>>>> 524288 4096 769806 812570 20165 20137 79896 >>>>>>> 783615 71217 80835 68550 80166 73733 >>>>>>> 122559 116844 >>>>>>> 524288 8192 797504 887823 123824 124513 94520 >>>>>>> 844880 86441 710319 65077 636713 819868 >>>>>>> 87765 80121 >>>>>>> 524288 16384 788468 858216 92580 117354 109583 >>>>>>> 850179 63966 856965 121151 789252 805040 >>>>>>> 123810 119088 >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Feb 27, 2013, at 2:46 PM, Bryan Whitehead >>>>>>> <driver at megahappy.net <mailto:driver at megahappy.net>> >>>>>>> wrote: >>>>>>> >>>>>>>> How are you doing the read/write tests on the >>>>>>>> fuse/glusterfs mountpoint? Many small files will be >>>>>>>> slow because all the time is spent coordinating locks. >>>>>>>> >>>>>>>> >>>>>>>> On Wed, Feb 27, 2013 at 9:31 AM, Thomas Wakefield >>>>>>>> <twake at cola.iges.org <mailto:twake at cola.iges.org>> >>>>>>>> wrote: >>>>>>>> >>>>>>>> Help please- >>>>>>>> >>>>>>>> >>>>>>>> I am running 3.3.1 on Centos using a 10GB >>>>>>>> network. I get reasonable write speeds, >>>>>>>> although I think they could be faster. But my >>>>>>>> read speeds are REALLY slow. >>>>>>>> >>>>>>>> Executive summary: >>>>>>>> >>>>>>>> On gluster client- >>>>>>>> Writes average about 700-800MB/s >>>>>>>> Reads average about 70-80MB/s >>>>>>>> >>>>>>>> On server- >>>>>>>> Writes average about 1-1.5GB/s >>>>>>>> Reads average about 2-3GB/s >>>>>>>> >>>>>>>> Any thoughts? >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Here are some additional details: >>>>>>>> >>>>>>>> Nothing interesting in any of the log files, >>>>>>>> everything is very quite. >>>>>>>> All servers had no other load, and all clients >>>>>>>> are performing the same way. >>>>>>>> >>>>>>>> >>>>>>>> Volume Name: shared >>>>>>>> Type: Distribute >>>>>>>> Volume ID: de11cc19-0085-41c3-881e-995cca244620 >>>>>>>> Status: Started >>>>>>>> Number of Bricks: 26 >>>>>>>> Transport-type: tcp >>>>>>>> Bricks: >>>>>>>> Brick1: fs-disk2:/storage/disk2a >>>>>>>> Brick2: fs-disk2:/storage/disk2b >>>>>>>> Brick3: fs-disk2:/storage/disk2d >>>>>>>> Brick4: fs-disk2:/storage/disk2e >>>>>>>> Brick5: fs-disk2:/storage/disk2f >>>>>>>> Brick6: fs-disk2:/storage/disk2g >>>>>>>> Brick7: fs-disk2:/storage/disk2h >>>>>>>> Brick8: fs-disk2:/storage/disk2i >>>>>>>> Brick9: fs-disk2:/storage/disk2j >>>>>>>> Brick10: fs-disk2:/storage/disk2k >>>>>>>> Brick11: fs-disk2:/storage/disk2l >>>>>>>> Brick12: fs-disk2:/storage/disk2m >>>>>>>> Brick13: fs-disk2:/storage/disk2n >>>>>>>> Brick14: fs-disk2:/storage/disk2o >>>>>>>> Brick15: fs-disk2:/storage/disk2p >>>>>>>> Brick16: fs-disk2:/storage/disk2q >>>>>>>> Brick17: fs-disk2:/storage/disk2r >>>>>>>> Brick18: fs-disk2:/storage/disk2s >>>>>>>> Brick19: fs-disk2:/storage/disk2t >>>>>>>> Brick20: fs-disk2:/storage/disk2u >>>>>>>> Brick21: fs-disk2:/storage/disk2v >>>>>>>> Brick22: fs-disk2:/storage/disk2w >>>>>>>> Brick23: fs-disk2:/storage/disk2x >>>>>>>> Brick24: fs-disk3:/storage/disk3a >>>>>>>> Brick25: fs-disk3:/storage/disk3b >>>>>>>> Brick26: fs-disk3:/storage/disk3c >>>>>>>> Options Reconfigured: >>>>>>>> performance.write-behind: on >>>>>>>> performance.read-ahead: on >>>>>>>> performance.io-cache: on >>>>>>>> performance.stat-prefetch: on >>>>>>>> performance.quick-read: on >>>>>>>> cluster.min-free-disk: 500GB >>>>>>>> nfs.disable: off >>>>>>>> >>>>>>>> >>>>>>>> sysctl.conf settings for 10GBe >>>>>>>> # increase TCP max buffer size settable using >>>>>>>> setsockopt() >>>>>>>> net.core.rmem_max = 67108864 >>>>>>>> net.core.wmem_max = 67108864 >>>>>>>> # increase Linux autotuning TCP buffer limit >>>>>>>> net.ipv4.tcp_rmem = 4096 87380 67108864 >>>>>>>> net.ipv4.tcp_wmem = 4096 65536 67108864 >>>>>>>> # increase the length of the processor input queue >>>>>>>> net.core.netdev_max_backlog = 250000 >>>>>>>> # recommended default congestion control is htcp >>>>>>>> net.ipv4.tcp_congestion_control=htcp >>>>>>>> # recommended for hosts with jumbo frames enabled >>>>>>>> net.ipv4.tcp_mtu_probing=1 >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> Thomas W. >>>>>>>> Sr. Systems Administrator COLA/IGES >>>>>>>> twake at cola.iges.org <mailto:twake at cola.iges.org> >>>>>>>> Affiliate Computer Scientist GMU >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Gluster-users mailing list >>>>>>>> Gluster-users at gluster.org >>>>>>>> <mailto:Gluster-users at gluster.org> >>>>>>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>> >>> _______________________________________________ >>> Gluster-users mailing list >>> Gluster-users at gluster.org <mailto:Gluster-users at gluster.org> >>> http://supercolony.gluster.org/mailman/listinfo/gluster-users >> >> >> _______________________________________________ >> Gluster-users mailing list >> Gluster-users at gluster.org <mailto:Gluster-users at gluster.org> >> http://supercolony.gluster.org/mailman/listinfo/gluster-users >> >> > > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://supercolony.gluster.org/mailman/listinfo/gluster-users -------------- next part -------------- An HTML attachment was scrubbed... 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