On 11/20/2011 05:19 AM, Catalin Constantin wrote:
The connection between servers is 10MBytes / sec not 10Mbit / sec.
Are you sure? To my knowledge almost no ethernet gear runs at 10 MB/s. It's almost always 10, 100, 1000, or 10000 Mb/s.
It may be your n_val. If it's the default (3), one of your two machines has to handle that third replica. That'll cut your throughput significantly. Finally, your disks may be the bottleneck. I'd take a look at iostat and look for significant (on our servers, 2.6% meant we were thrashing) IO_WAIT time on the riak beam.smp process.
--Kyle
One row of data looks like this: 309819178daz...@gmail.com <mailto:daz...@gmail.com>55942dzt1home2011-05-3116:22:102011-09-07 17:03:48127.0.0.111 I use Protobuf transport. If dw = 0 and w = 0 there is no wait for other replica nodes, right ? This should improve the write speed, correct ? On Sun, Nov 20, 2011 at 2:21 PM, Erik Søe Sørensen <e...@trifork.com <mailto:e...@trifork.com>> wrote: This depends quite a bit on the sizes of your objects. Supposing an average size of 2KB, and n=3: on each write, on average 1.5 of the replicas would be on the other node, implying inter-node network traffic of 1.5*2KB=3KB (and this is just in one direction). If your inter-node network connection is indeed 10Mbit ~ 1MB/s, then 300 writes/s * 3KB = 0.9MB/s would just about saturate the connection. You may want to check the network utilization. ________________________________________ From: riak-users-boun...@lists.basho.com <mailto:riak-users-boun...@lists.basho.com> [riak-users-boun...@lists.basho.com <mailto:riak-users-boun...@lists.basho.com>] On Behalf Of Catalin Constantin [daz...@gmail.com <mailto:daz...@gmail.com>] Sent: 20 November 2011 11:10 To: riak-users@lists.basho.com <mailto:riak-users@lists.basho.com> Subject: slow 2 node cluster Hello, I am trying to evaluate / run some tests on a 4 mil dataset. I have 2 nodes setup (different machines - 8GB ram each, I7 cpus). 10 MB connection between them. I am trying to insert data into riak using w=1 and dw=1 (also tried with dw = 0, w = 0). For each risk object i have 4 indexes (2 binary 2 int). Riak backend is leveldb. I can't get more than 300 inserts per second. I have also tried running 2 threads each hitting the different node. Nothing changed too much. Is this normal behavior ? -- Catalin Constantin -- Catalin Constantin Dazoot Software http://www.dazoot.eu/ _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
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