Sorry, I meant that R15B02's scheduler could be the cause of this, not a solution. Since you're not using it, it's obviously not that.
If you're making no requests and /_active_tasks is empty and beam is still chewing CPU, then that's a bit of a puzzle. Sent from the ocean floor On 10 Oct 2012, at 14:37, Pekka Olavi <[email protected]> wrote: > Thanks Dave and Robert! > > Actually, from the ten threads spawned two are doing this, the other > about 10x more than the other. As far as I understand, the engine > should be doing nothing (it's almost empty, just on db with 2 design > docs and 4 normal ones), so this scheduling thingy Robert mentioned > seems like a good candidate to start with. I'm currently at R14B02, > I'll upgrade and see what happens with a newer version. > > .p > > On Wed, Oct 10, 2012 at 4:24 PM, Robert Newson <[email protected]> > wrote: >> http://dieswaytoofast.blogspot.com.es/2012/09/cpu-utilization-in-erlang-r15b02.html?m=1 >> >> Sent from the ocean floor >> >> On 10 Oct 2012, at 14:23, Robert Newson <[email protected]> wrote: >> >> I recall R15B02, perhaps earlier, introduced a scheduler that kept the >> CPU hot to eliminate delays when changing state from idle. I read that >> somewhere recently, but can't find the link. >> >> Sent from the ocean floor >> >> On 10 Oct 2012, at 13:05, Dave Cottlehuber <[email protected]> wrote: >> >> On 10 October 2012 13:50, Pekka Olavi <[email protected]> wrote: >> >> Hello folks, I run a couch on my desktop for testing purposes. >> >> Everything else is fine and dandy and I'm actually loving developing >> >> for the web with couch. There is one gripe though, the beam.smp >> >> process is bleeding the CPU, for some reason I have no proficiency to >> >> analyse. >> >> >> http://pastebin.com/eqtUyNZS >> >> >> I start the server with "sudo couchdb" and it shows up in my ps aux like so: >> >> /usr/lib/erlang/erts-5.8.3/bin/beam.smp -Bd -K true -A 4 -- -root >> >> /usr/lib/erlang -progname erl -- -home /home/halides -- -noshell >> >> -noinput -os_mon start_memsup false start_cpu_sup false >> >> disk_space_check_interval 1 disk_almost_full_threshold 1 -sasl >> >> errlog_type error -couch_ini /usr/local/etc/couchdb/default.ini >> >> /usr/local/etc/couchdb/local.ini -s couch >> >> >> Any help appreciated! >> >> >> .p >> >> >> Hi Pekka, >> >> >> What is couchdb doing at the time? e.g. are you view indexing, >> >> whatever. Anything in the couch.log when running in debug mode? >> >> >> None of this will fix the problem, but it might be helpful to note >> >> what OS you're running as well, and how erlang was compiledm (or >> >> rpmd). >> >> >> Some of the flags you are using seem wrong if you are intending to >> >> enable kernel polling and increase the IO scheduler threads. >> >> >> -A 4 should be +A 4 >> >> -K true should be +K true >> >> ditto for your +Bd option >> >> >> You might be interested in some of the tricks in here >> >> http://erlang-in-production.herokuapp.com/#16 from archaelus, and let >> >> us know what processes are hogging. >> >> >> After that, I think your best bet will be to hop on irc in #erlang or >> >> #erlounge and get some other smart ideas. >> >> >> A+ >> >> Dave
