Comment 5 for bug 802850

Hi!

You have confirmed that you have a high to no timeout, and that the server has been set to only request a set number of workers to come online?

Sent from my C64

On Jul 8, 2011, at 1:34 AM, Artur Bodera <email address hidden> wrote:

> Just compiled and installed 0.23 daemon,
> recompilled pecl extension,
> restarted everything
>
> ! same thing.
>
> Below is strace of one of the workers.
>
> I have noticed that "THE LOOP" happens when the machine has an avg load
> of 10+. It does not occur when the machine has no load (i.e. <1) - then
> the gearman daemon behaves nicely, idle workers have cpu time < 1s in 1h
> of waiting.
>
> Unfortunatelly as soon as some cpu-intensive work kicks in, one of
> "gearman -d" threads starts eatung up the CPU resulting in avg load >
> 30.
>
>
> sendto(12, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=12, events=POLLIN}], 1, 5000) = 1 ([{fd=12, revents=POLLIN}])
> getsockopt(12, SOL_SOCKET, SO_ERROR, [823261839558180864], [4]) = 0
> sendto(12, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> sendto(12, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=12, events=POLLIN}], 1, 5000) = 1 ([{fd=12, revents=POLLIN}])
> getsockopt(12, SOL_SOCKET, SO_ERROR, [823261839558180864], [4]) = 0
> sendto(12, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> sendto(12, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=12, events=POLLIN}], 1, 5000) = 1 ([{fd=12, revents=POLLIN}])
> getsockopt(12, SOL_SOCKET, SO_ERROR, [823261839558180864], [4]) = 0
> sendto(12, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> sendto(12, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=12, events=POLLIN}], 1, 5000) = 1 ([{fd=12, revents=POLLIN}])
> getsockopt(12, SOL_SOCKET, SO_ERROR, [823261839558180864], [4]) = 0
> sendto(12, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> sendto(12, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=12, events=POLLIN}], 1, 5000) = 1 ([{fd=12, revents=POLLIN}])
> getsockopt(12, SOL_SOCKET, SO_ERROR, [823261839558180864], [4]) = 0
> sendto(12, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> recvfrom(12, "\0RES\0\0\0\n\0\0\0\0", 8192, 0, NULL, NULL) = 12
> sendto(12, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=12, events=POLLIN}], 1, 5000) = 1 ([{fd=12, revents=POLLIN}])
> getsockopt(12, SOL_SOCKET, SO_ERROR, [823261839558180864], [4]) = 0
> sendto(12, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> recvfrom(12, "\0RES\0\0\0\n\0\0\0\0\0RES\0\0\0\n\0\0\0\0\0RES\0\0\0\n"..., 8192, 0, NULL, NULL) = 60
> sendto(12, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=12, events=POLLIN}], 1, 5000^Cto(12, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0 <unfinished ...>
> Process 30713 detached
>
>
> ** Summary changed:
>
> - Gearman 100% cpu usage, workers in a loop (PHP, 0.22)
> + Gearman 100% cpu usage, workers in a loop (PHP, 0.22, 0.23)
>
> --
> You received this bug notification because you are subscribed to
> Gearman.
> https://bugs.launchpad.net/bugs/802850
>
> Title:
> Gearman 100% cpu usage, workers in a loop (PHP, 0.22, 0.23)
>
> Status in Gearman Server and Client Libraries:
> New
>
> Bug description:
> After some time, minutes to hours, with a slight load on the gearman
> server (~1 job/min), workers get lost in a loop (per strace) and
> gearmand eats up 100% cpu.
>
> Strace of a worker:
> getsockopt(7, SOL_SOCKET, SO_ERROR, [117528996916232192], [4]) = 0
> sendto(7, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> recvfrom(7, "\0RES\0\0\0\n\0\0\0\0", 8192, 0, NULL, NULL) = 12
> sendto(7, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=7, events=POLLIN}], 1, 5000) = 1 ([{fd=7, revents=POLLIN}])
> getsockopt(7, SOL_SOCKET, SO_ERROR, [117528996916232192], [4]) = 0
> sendto(7, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> recvfrom(7, "\0RES\0\0\0\n\0\0\0\0", 8192, 0, NULL, NULL) = 12
> sendto(7, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=7, events=POLLIN}], 1, 5000) = 1 ([{fd=7, revents=POLLIN}])
> getsockopt(7, SOL_SOCKET, SO_ERROR, [117528996916232192], [4]) = 0
> sendto(7, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> recvfrom(7, "\0RES\0\0\0\n\0\0\0\0", 8192, 0, NULL, NULL) = 12
> sendto(7, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=7, events=POLLIN}], 1, 5000) = 1 ([{fd=7, revents=POLLIN}])
> getsockopt(7, SOL_SOCKET, SO_ERROR, [117528996916232192], [4]) = 0
> sendto(7, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> recvfrom(7, "\0RES\0\0\0\n\0\0\0\0", 8192, 0, NULL, NULL) = 12
> sendto(7, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=7, events=POLLIN}], 1, 5000) = 1 ([{fd=7, revents=POLLIN}])
> getsockopt(7, SOL_SOCKET, SO_ERROR, [117528996916232192], [4]) = 0
> sendto(7, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> recvfrom(7, "\0RES\0\0\0\n\0\0\0\0", 8192, 0, NULL, NULL) = 12
> sendto(7, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=7, events=POLLIN}], 1, 5000) = 1 ([{fd=7, revents=POLLIN}])
> getsockopt(7, SOL_SOCKET, SO_ERROR, [117528996916232192], [4]) = 0
> sendto(7, "\0REQ\0\0\0\36\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> recvfrom(7, "\0RES\0\0\0\n\0\0\0\0", 8192, 0, NULL, NULL) = 12
> sendto(7, "\0REQ\0\0\0\4\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12
> poll([{fd=7, events=POLLIN}], 1, 5000) = 1 ([{fd=7, revents=POLLIN}])
> ....
>
>
> Strace of gearmand:
>
>
> # strace -p 2820
> Process 2820 attached - interrupt to quit
> clock_gettime(CLOCK_MONOTONIC, {3794803, 727265822}) = 0
> epoll_wait(3,
>
> (... and nothing more.... )
>
>
> All workers are PHP based.
>
>
> # php --ri gearman
>
> gearman
>
> gearman support => enabled
> extension version => 0.8.0
> libgearman version => 0.22
> Default TCP Host => 127.0.0.1
> Default TCP Port => 4730
>
> To manage notifications about this bug go to:
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