Re: [squid-users] Squid CPU 100% infinite loop

Hi all,
after tests and debug level increased to 5, i am sorry to say: nothing
found...

Le 2013-05-16 08:40, loic.blot a écrit :
> Hi amos, two precisions:
> in MT, an infinite loop can be only on one thread and affect only
> performance of other threads and block the "infinite looped" thread. I
> don't know if squid is MT, but i think --with-pthread have an
> interest.
> My squid doesn't use disk cache (you have all my configuration in the
> first thread of this topic). Then looking directory isn't possible,
> swapping to and from disk is also impossible for this reason but also
> because my server have 16GB RAM and squid max mem_cache is at 6800MB
> (an my OpenBSD router uses only 200MB ram).
>
> Le 2013-05-16 07:11, Amos Jeffries a écrit :
>
> "infinite loop" is exactly that ... infinite. As in: a code loop which
> *never* ends.
>
> What you are describing is simply a program which is suddenly given a
> LOT of processing to do. Such as scanning a large cache directory full
> of very smal objects, swapping all of its memory to or from disk,
> performing a huge number of memory seeks to find something, or any
> number of other operations which consume CPU time.
> What can be done to remove the CPU load depends on what the cause is.
>
> As Alex said kdump is not helpful (it only tells you what *kernel*
> calls are doing at the time), but looking at the Squid events queue
> for things which are schedued to happen about the time of the problem
> will give clues, as will looking at things like what client requests
> are underway at the time.
>
> Amos
Received on Thu May 16 2013 - 13:09:00 MDT