[ejabberd] Beam 100% CPU usage

Brian Cully bcully at gmail.com
Fri Jan 8 23:42:16 MSK 2010


	Try using "i()." in the debug console. Typically if something is burning CPU like that there will be a large mailbox associated with the offending process.

-bjc

On 8-Jan-2010, at 04:29, Emmanuel Lacour wrote:

> Dear ejabberd users/admins/hackers,
> 
> I run here a small jabberd 2.0.5 under Debian lenny (backport), with 86
> users and an average of 40 users connected.
> I use ldap for authentication and vcards.
> 
> hardware is a vserver (kvm migration planned) is almost alone on a
> Celeron 2.36Ghz with 1G RAM.
> 
> We were using jabberd 1.4 and since we use ejabberd, jabber is slow and
> the ejabberd beam process uses 100% cpu usage!
> 
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> 10445 ejabberd  20   0  360m 194m 2880 R 98.7 19.2   7122:44 beam 
> 
> strace shows continuous munmap/mmap2:
> 
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 821375025}) = 0
> [pid 10445] epoll_wait(3, {}, 256, 0)   = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 823385568}) = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 823480381}) = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 823791380}) = 0
> [pid 10445] munmap(0xa5306000, 4730880) = 0
> [pid 10445] munmap(0xa3e75000, 8417280) = 0
> [pid 10445] mmap2(NULL, 13148160, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa3e75000
> [pid 10445] epoll_wait(3, {}, 256, 0)   = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 856476944}) = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 856576491}) = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 858482298}) = 0
> [pid 10445] epoll_wait(3, {}, 256, 0)   = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 859207587}) = 0
> [pid 10445] munmap(0xa467c000, 4730880) = 0
> [pid 10445] munmap(0xa4aff000, 8417280) = 0
> [pid 10445] mmap2(NULL, 13148160, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa4aff000
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 885227089}) = 0
> [pid 10445] epoll_wait(3, {}, 256, 0)   = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 887134193}) = 0
> [pid 10445] clock_gettime(CLOCK_MONOTONIC, {32292946, 887225328}) = 0
> [pid 10445] munmap(0xa5306000, 4730880) = 0
> [pid 10445] munmap(0xa3e75000, 8417280) = 0
> 
> 
> 
> any idea to solve this problem?
> 
> 
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