cgroup/control group config problem

[Gary Artim]

i did the following to setup a cgroup, but when I test "it" doesn't
kill the pid, anyone get this working? must be missing
something...program mallocs 32GB...much thanks for advise!

::install::

yum install libcgroup-tools libcgroup

::config::

cd /sys/fs/cgroup/memory
mkdir alpha
echo 4096000000 > alpha/memory.limit_in_bytes
cat alpha/memory.limit_in_bytes
change /etc/cgrules.conf add line:
@users       memory    alpha/
start: cgrulesengd

::test::

check if pid is in alpha/tasks:
cat /sys/fs/cgroup/memory/alpa/tasks
run:
cat > memlimit.c <<"END"
#include <stdlib.h>
#include <stdio.h>
#define  ONEGB  1073741824
int main(void) {
    int i;
    for (i=0; i < 32; i++) {
        char *q = malloc(ONEGB);
        printf ("Malloced: %d / GB\n", (i+1));
    }
    sleep(9999999);
}
END
gcc memlimit.c && ./a.out

[kevin martin]

On 09/24/13 13:52, Gary Artim wrote:
> i did the following to setup a cgroup, but when I test "it" doesn't
> kill the pid, anyone get this working? must be missing
> something...program mallocs 32GB...much thanks for advise!
>
> ::install::
>
> yum install libcgroup-tools libcgroup
>
> ::config::
>
> cd /sys/fs/cgroup/memory
> mkdir alpha
> echo 4096000000 > alpha/memory.limit_in_bytes
> cat alpha/memory.limit_in_bytes
> change /etc/cgrules.conf add line:
> @users       memory    alpha/
> start: cgrulesengd
>
> ::test::
>
> check if pid is in alpha/tasks:
> cat /sys/fs/cgroup/memory/alpa/tasks
> run:
> cat > memlimit.c <<"END"
> #include <stdlib.h>
> #include <stdio.h>
> #define  ONEGB  1073741824
> int main(void) {
>     int i;
>     for (i=0; i < 32; i++) {
>         char *q = malloc(ONEGB);
>         printf ("Malloced: %d / GB\n", (i+1));
>     }
>     sleep(9999999);
> }
> END
> gcc memlimit.c && ./a.out

Did you "man systemd.cgroup"?  Do you have to do something to turn memory accounting on to make this work (perhaps i
n/etc/cgrules.conf)?  Have you tried setting up a.out as a service with the appropriate MemoryLimit=bytes and/or
MemorySoftLimit=bytes settings set and then tried to run it as a service?

Kevin

[Gary Artim]

did most of the above, and did get it to work, but mallocing must be
consider different storage, it doesn't produce a oom kill.

the RTFM approach was done first, but like a lot of the tools the apis are
in flux and knowing what to do is a hair pulling process. the way it did it
is doc'ed in the kernel docs.

g
~
On Sep 24, 2013 1:24 PM, "Kevin Martin"  wrote:
> On 09/24/13 13:52, Gary Artim wrote:
> > i did the following to setup a cgroup, but when I test "it" doesn't
> > kill the pid, anyone get this working? must be missing
> > something...program mallocs 32GB...much thanks for advise!
> >
> > ::install::
> >
> > yum install libcgroup-tools libcgroup
> >
> > ::config::
> >
> > cd /sys/fs/cgroup/memory
> > mkdir alpha
> > echo 4096000000 > alpha/memory.limit_in_bytes
> > cat alpha/memory.limit_in_bytes
> > change /etc/cgrules.conf add line:
> > @users       memory    alpha/
> > start: cgrulesengd
> >
> > ::test::
> >
> > check if pid is in alpha/tasks:
> > cat /sys/fs/cgroup/memory/alpa/tasks
> > run:
> > cat > memlimit.c <<"END"
> > #include <stdlib.h>
> > #include <stdio.h>
> > #define  ONEGB  1073741824
> > int main(void) {
> >     int i;
> >     for (i=0; i < 32; i++) {
> >         char *q = malloc(ONEGB);
> >         printf ("Malloced: %d / GB\n", (i+1));
> >     }
> >     sleep(9999999);
> > }
> > END
> > gcc memlimit.c && ./a.out
>
> Did you "man systemd.cgroup"?  Do you have to do something to turn memory
> accounting on to make this work (perhaps i
> n/etc/cgrules.conf)?  Have you tried setting up a.out as a service with
> the appropriate MemoryLimit=bytes and/or
> MemorySoftLimit=bytes settings set and then tried to run it as a service?
>
> Kevin
>
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