Re: High CPU usage by beam.smp
Thank you Magnus. Your answer helps. With Regards, Fasil K On Thu, Jan 28, 2016 at 3:53 PM, Magnus Kessler wrote: > On 28 January 2016 at 09:05, Fasil K wrote: > >> >> Hello, I am using riak 2.1.1 for saving some datas (5 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 > > ___ > 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
Re: High CPU usage by beam.smp
On 28 January 2016 at 09:05, Fasil K wrote: > > Hello, I am using riak 2.1.1 for saving some datas (5 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 ___ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
High CPU usage by beam.smp
Hello, I am using riak 2.1.1 for saving some datas (5 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 ___ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
