How many physical machines (disks/cores/nics) are in your cluster? -Alexander
@siculars http://siculars.posthaven.com Sent from my iRotaryPhone > On Mar 6, 2014, at 22:07, "[email protected]" <[email protected]> > wrote: > > Greetings all... > > I am running tests with Riak Cluster. > When this cluster has only one node, the max throughput is about 1500 > ops/s(CPU becomes the bottleneck). > But after I added 4 more nodes into the cluster, no matter how I changed the > configuration file of Basho benchmark tool, > the number of throughput have never been more than ~3500 ops/s. > CPU utilization on each node is about 60~65% (captured by iostat and sar) > > And when I added 5 more nodes(10 nodes totally), it is the same result. > And CPU utilization on each node is about 60%. > I can't understand why. > > During the tests, I tried: > 1)Change ring size from 64 to 128 > 2)Change basho benchmark configuration file, like "mode","concurrent" and > "key_generator"... > 3)Modify some system limits on both riak nodes and basho bench servers, such > as file descriptor , tcp settings. > 4)Monitoring system like cpu, memory and IO, and none of them become the > bottleneck. > 5)Monitoring the basho bench server, low load. > > Any ideas? > Or did I make any mistakes in my configuration file? > > Configuration file of Basho benchmark tool: > =================================================================== > {mode, max}. > {duration, 15}. > {concurrent, 500}. > {driver, basho_bench_driver_http_raw}. > {http_raw_ips, > ["10.11.20.46","10.11.20.47","10.11.20.48","10.11.20.49","10.11.20.50","10.11.20.51","10.11.20.52","10.11.20.53"]}. > {http_raw_port, 8098}. > {http_raw_path, "/riak/test"}. > {key_generator, {partitioned_sequential_int, > 1000000000000000,8000000000000000}}. %%we want 16 bytes long key-length > {value_generator, {fixed_bin, 1024}}. %%1KB > {operations, [{insert,4}, {get,6}]}. > =============================================================================== > > Here are our server specifications(VMs based on Xenserver): > 1)Riak nodes: 2cores + 4GB RAM + 20GB disk > 2)Basho benchmark, 4 cores + 4GB RAM, 30GB disk. > > Thank you very much ! > _______________________________________________ > riak-users mailing list > [email protected] > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
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