Limiting CPU on some processes on web server

[Julien Cigar]

On Wed, Mar 11, 2015 at 03:11:57PM +0100, Polytropon wrote:
> On Wed, 11 Mar 2015 14:04:19 +0000, opendaddy at hushmail.com wrote:
> > On 11. mars 2015 at 1:41 PM, "Polytropon" <freebsd at edvax.de> wrote:
> > >
> > >The main differnce in functionality is that ulimit -t defines
> > >the limit as time, whereas cpulimit defines it as percentage
> > >of CPU resources used.
> > >
> > >Another difference is that ulimit comes with FreeBSD's default
> > >scripting shell, whereas cpulimit is a Linux program that has
> > >to be compiled from source, after porting it, of course. :-)
> > >
> > 
> > Sounds really tempting especially considering those other cpulimit
> > compile errors.
> 
> If you manually add "#include <libgen.h>" to src/cpulimit.c
> and remove "#ifdef __APPLE__" ... "#endif" from tests/process_iterator_test.c
> around the "#include <libgen.h>" line, you can run "gmake"
> (in src/ and /test, or at the top level), and it will successfully
> build.

there is sysutils/cpulimit too ..

> 
> Result:
> 
> $ ./cpulimit 
> Error: You must specify a cpu limit percentage
> Usage: cpulimit [OPTIONS...] TARGET
>    OPTIONS
>       -l, --limit=N          percentage of cpu allowed from 0 to 200 (required)
>       -v, --verbose          show control statistics
>       -z, --lazy             exit if there is no target process, or if it dies
>       -i, --include-children limit also the children processes
>       -h, --help             display this help and exit
>    TARGET must be exactly one of these:
>       -p, --pid=N            pid of the process (implies -z)
>       -e, --exe=FILE         name of the executable program file or path name
>       COMMAND [ARGS]         run this command and limit it (implies -z)
> 
> You can try that "quick & dirty" modification and check if
> the cputime program _works_ for you.
> 
> 
> 
> > Is there a CPU time limit equivalent to say 20% or have I totally misunderstood?
> 
> I'd say it's hard to calculate or estimate absolute CPU time
> from relative resource consumption (load). You will probably
> have to test this with the real application you want to limit.
> 
> 
> 
> -- 
> Polytropon
> Magdeburg, Germany
> Happy FreeBSD user since 4.0
> Andra moi ennepe, Mousa, ...
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-- 
Julien Cigar
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