any advise to solve this? On Fri, Feb 25, 2011 at 1:05 PM, Sean Cribbs <s...@basho.com> wrote: > Yes, the majority of the cost is probably in TCP setup. That pain is > happening at the TCP stack level, not in Erlang. It's actually really cheap > and easy to spawn a new process in Erlang, so there's no reason to have > "standby workers", especially when they don't need to maintain state between > requests. > > Sean Cribbs <s...@basho.com> > Developer Advocate > Basho Technologies, Inc. > http://basho.com/ > > On Feb 25, 2011, at 12:45 PM, Wilson MacGyver wrote: > >> I've tried it, it didn't have much impact. A bit more info on how I'm >> doing the test. >> >> I'm using apachebench. I purposely have it grab the same key/value over and >> over >> again. >> >> if I use concurrent connection of 10, 1000 requests each. 50% of the >> request complets >> within 7ms, longest request is 38ms. this is quite good. >> >> now, if I increase the concurrent connection to 100, 50% of the >> request complets at 77ms. >> >> it "feels" like a paying for startup cost of connection problem to me. >> Is there a way to purposely >> startup riak with a bunch of standby workers, or something to that effect? >> >> On Fri, Feb 25, 2011 at 11:37 AM, Sean Cribbs <s...@basho.com> wrote: >>> You can disable Nagle on the riak side (at least on 0.14 and later). Put >>> this in the riak_core section of app.config: >>> >>> {disable_http_nagle, true} >>> >>> Sean Cribbs <s...@basho.com> >>> Developer Advocate >>> Basho Technologies, Inc. >>> http://basho.com/ >>> >>> On Feb 25, 2011, at 9:33 AM, Wilson MacGyver wrote: >>> >>>> TCP_NODELAY is something you'd set when you use the socket API call, >>>> not a global tuning setting on the OS as I recall. >>>> >>>> On Fri, Feb 25, 2011 at 9:28 AM, Nico Meyer <nico.me...@adition.com> wrote: >>>>> Whenever I see latencies which are roughly multiples of 40ms it screams >>>>> to me 'nagle algorithm'. I have seen this so often now, that the first >>>>> thing I check is, if the TCP_NODELAY option is set on the TCP socket on >>>>> both ends. >>>> >> >> -- >> Omnem crede diem tibi diluxisse supremum. >> >> _______________________________________________ >> riak-users mailing list >> riak-users@lists.basho.com >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > >
-- Omnem crede diem tibi diluxisse supremum. _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
