Hi M H, The default Riak configuration has N=3 [1], which means that it is configured to run on a 3-node environment. This also means that every PUT you do must write 3 values to your local machine! Changing n_val for your Riak bucket to 1 will make more sense for a 1-node environment.
[1] http://wiki.basho.com/Replication.html#Selecting-an-N-value-(n_val) Also, have a look at the previous thread [2] that I posted a couple of days ago. In short, the RESTful interface can be quite slow. Maybe have a look at Sean Cribbs parameter. Or event better, use the protocol buffer API instead. [2] http://lists.basho.com/pipermail/riak-users_lists.basho.com/2011-April/003849.html Regards, Jens -----Ursprungligt meddelande----- Från: riak-users-boun...@lists.basho.com [mailto:riak-users-boun...@lists.basho.com] För M H Skickat: den 13 april 2011 14:59 Till: riak-users@lists.basho.com Ämne: [newbie] riak performance - basics Hi, I am new to Riak - just compiled it and trying it out. I have some questions about performance. I am running a single riak node with default configuration (only changed the IPs) on a core i7 machine (Ubuntu). I run a very simple JMeter test (RESTful calls): 1 .PUT a simple json object into riak (~30 bytes; key is static - so DB has only one key) 2. GET the object While the test is running riak seems to be using all the CPU it can get - 'top' reports ~99.5% CPU usage (beam.smp is using ~780% so all 8 cores). Here are some results from the JMeter test: * 5 threads: 1.PUT avg: 458 ms Throughput 6.1/sec 2.GET avg: 355 ms Throughput 6.1/sec * 50 threads: 1.PUT avg: 5325 ms Throughput 6.1/sec 2.GET avg: 2838 ms Throughput 6.1/sec The numbers are pretty disappointing. Is there something wrong with the default configuration? Or I am misusing riak in some way? There is only 1 key with simple value in the DB.... Here's some numbers from admin stats: vnode gets : 2118 vnode_puts : 1067 read_repairs : 1 vnode_gets_total : 224061 vnode_puts_total : 89045 node_gets : 680 node_gets_total : 74676 node_get_fsm_time_mean : 3047570 node_get_fsm_time_median : 2949500 node_get_fsm_time_95 : 4888000 node_get_fsm_time_99 : 5964050 node_get_fsm_time_100 : 6348870 node_puts : 339 node_puts_total : 29543 node_put_fsm_time_mean : 2433651 node_put_fsm_time_median : 2472125 node_put_fsm_time_95 : 4054512 node_put_fsm_time_99 : 4504152 node_put_fsm_time_100 : 4908213 read_repairs_total : 180 cpu_nprocs : 620 cpu_avg1 : 2104 cpu_avg5 : 2117 cpu_avg15 : 2099 storage_backend : riak_kv_bitcask_backend Any hints? -- MH _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
