Hi there, I've set up a new cluster, and have been doing pre-deployment benchmarks on it. The benchmark I was running slowly sunk from 1000 TPS to 250 TPS over the course of the single 8 hour benchmark doing 1 read+1 update using 1k values. I'm wondering if anyone might have suggestions on how I can improve this.
Here's a graph of the benchmark results: http://twitpic.com/9jh6hp/full And the basho_bench config: https://gist.github.com/837239813dabb9c70c7a This is on a cluster with 5 nodes of identical hardware, with the benchmark running from a separate server. The nodes all have single proc quad-core Sandy Beach CPUs, 8 GB of ram, and 600GB 15K RPM drives. They're running Ubuntu 10.04 with the ext4 filesystem, and noop ioscheduler. For the benchmark above, Riak itself was setup in LevelDB, with a ringsize of 1024, and the default config settings for LevelDB. There was about 10GB of benchmark data already in each node. While the benchmarks are running, iowait hits about 20%, util about 80%, and each server consumes about 4GB of ram. Can anyone confirm this is expected performance from this kind of setup, or offer suggestions on how to improve performance? --- As an aside, I've since repaved the 5 nodes and adjusted it to a ring size of 128 (I'm concerned about the scaling cap with this), and leveldb settings like this: {write_buffer_size, 16777216}, {max_open_files, 100}, {block_size, 262144}, {cache_size, 168430088} I've set it running on another 8 hour benchmark to see what it turns up. Cheers, Tim Haines.
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