[Lustre-discuss] [Lustre-devel] Queries regarding Lustre Throughput Numbers with mdtest benchmark
Nathan_Rutman at xyratex.com
Thu Jul 7 15:32:22 PDT 2011
I suspect that you are running this test against local hard drives instead of a shared Lustre mount point.
Are you sure Lustre is mounted at /tmp/l66 on all clients in hostfile?
On Jul 6, 2011, at 7:25 PM, Andreas Dilger wrote:
> On 2011-06-22, at 5:06 PM, vilobh meshram wrote:
>> I have a query regarding Lustre Throughput Numbers with mdtest benchmark.I am running mdtest benhmark with following options :-
>> /home/meshram/mpich2-new/mpich2-1.4/mpich2-install/bin/mpirun -np 256 -hostfile ./hostfile ./mdtest -z 3 -b 10 -I 5 -v -d /tmp/l66
>> where ,
>> mdtest - is the standard benchmark to test metadata operations. [https://computing.llnl.gov/?set=code&page=sio_downloads ]
>> /tmp/l66 is my Lustre mount.
>> I am using 1Gige Network with TCP transport.
>> hostfile has 8 host nodes
>> I am varying the number of processes as we can see in following table ..
>> I was amazed by the throughput which I got. I think this is too huge. Can someone please let me know if these numbers are correct ?
>> 4 Process : File creation : 0.501 sec, 44392.140 ops/sec
>> 8 Process : File creation : 0.685 sec, 64890.598 ops/sec
>> 16 Process : File creation : 1.426 sec, 62318.798 ops/sec
>> 32 Process : File creation : 2.947 sec, 60312.766 ops/sec
>> 64 Process : File creation : 5.630 sec, 63142.760 ops/sec
>> 128 Process : File creation : 13.208 sec, 53835.707 ops/sec
>> 256 Process : File creation : 24.601 sec, 57804.777 ops/sec
> Seems nobody has responded to your email, and I just found it buried in my
> I agree that the numbers are quite high, especially for GigE networking.
> More typical numbers are in the 5-20k creates/sec (depending on network
> and MDS hardware).
> That said, the above may not be completely impossible for small file
> counts (allowing all of the creates to be served from cache), or if the
> client+MDS+OSS are all on the same node (which avoids any network latency).
> You also didn't describe the Lustre filesystem, nor what version you are
> testing. This workload has gotten a faster with Lustre 2.1, and it stands
> to get faster in Lustre 2.2 also.
> Cheers, Andreas
> Andreas Dilger
> Principal Engineer
> Whamcloud, Inc.
> Lustre-devel mailing list
> Lustre-devel at lists.lustre.org
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