On 28 January 2016 at 09:05, Fasil K <[email protected]> wrote: > > Hello, I am using riak 2.1.1 for saving some datas (50000 datas). > I am running riak with a single node so far. my problem is riak is > consuming almost 40% of CPU in idle state. Can any one help me to solve > this issue.? > > > With Regards, > > Fasil K >
Hi Fasil, The CPU usage you observe is due to the way Erlang schedulers work. When they run out of work, they don't go to sleep immediately, but perform a busy wait for some time instead. This increases responsiveness. For a nice, detailed discussion of this please see http://jlouisramblings.blogspot.co.uk/2013/01/how-erlang-does-scheduling.html On a single node with the default ring size of 64, you also have a lot more VNodes than on a typical production node. A VNode is handled by an Erlang process, and all these processes require their own share of CPU and memory. I hope this answers your question. Regards, Magnus -- Magnus Kessler Client Services Engineer Basho Technologies Limited Registered Office - 8 Lincoln’s Inn Fields London WC2A 3BP Reg 07970431
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