HI Balbir,
The total RAM in the machine is 8002MB and the swap space is 471MB. The cgroup
where apache runs is restricted to 6000MB. I would like to keep apache from
swapping at all if possible, so have set memory.swappiness low and would like
to set memory.memsw.limit_in_bytes to the same value as memory.limit_in_bytes
or only a few MB higher if possible.
Thanks,
Andrew
----- Original Message -----
From: "Balbir Singh" <bsinghar...@gmail.com>
To: "Andrew Martin" <amar...@xes-inc.com>
Cc: libcg-devel@lists.sourceforge.net
Sent: Tuesday, May 1, 2012 2:40:59 AM
Subject: Re: [Libcg-devel] Cannot set memory.memsw.limit_in_bytes
On Wed, Apr 25, 2012 at 7:21 AM, Andrew Martin < amar...@xes-inc.com > wrote:
Hello,
I am running a VM with Ubuntu Server 10.04 amd64. I have installed and
configured cgroups to limit the resources available to samba, nfs, and
apache. My configuration is as follows:
/etc/cgconfig.conf
group nfs {
memory {
memory.limit_in_bytes = 500M;
memory.memsw.limit_in_bytes = 1000M;
}
cpu {
cpu.shares = 10;
}
}
group smb {
memory {
memory.limit_in_bytes = 1500M;
memory.memsw.limit_in_bytes = 2000M;
}
cpu {
cpu.shares = 13;
}
}
group apache {
memory {
memory.limit_in_bytes = 6G;
memory.memsw.limit_in_bytes = 6G;
memory.swappiness = 5;
}
cpu {
cpu.shares = 100;
}
}
mount {
cpu = /mnt/cgroups/cpu;
cpuacct = /mnt/cgroups/cpuacct;
memory = /mnt/cgroups/memory;
cpuset = /mnt/cgroups/cpuset;
}
/etc/cgrules.conf
## Samba Server
root:/usr/sbin/smbd cpu,memory smb/
root:/usr/sbin/nmbd cpu,memory smb/
## NFS Server
root:/usr/sbin/exportfs cpu,memory nfs/
root:/usr/sbin/rpc.mountd cpu,memory nfs/
root:/usr/sbin/rpc.nfsd cpu,memory nfs/
root:/usr/sbin/rpc.svcgssd cpu,memory nfs/
root:nfsd cpu,memory nfs/
root:nfsd4 cpu,memory nfs/
## Apache Webserver
root:apache2 cpu,memory apache/
www-data cpu,memory apache/
Both memory.limit_in_bytes and memory.memsw.limit_in_bytes seem to
work fine for the smb cgroup, but no matter what values I use for the
apache cgroup I cannot set memory.memsw.limit_in_bytes.
How much total memory do you have on the system? How is total RAM + Swap?
<blockquote>
My goal is to
disable apache's ability to swap by setting memory.limit_in_bytes and
memory.memsw.limit_in_bytes to the same value (or memory.memsw.limit_in_bytes
slightly higher). After running "service
cgconfig restart" to restart the cgconfig service, I check the value
of memory.limit_in_bytes and memory.memsw.limit_in_bytes for the
apache group:
# cat /mnt/cgroups/memory/apache/ memory.limit_in_bytes
6442450944
# cat /mnt/cgroups/memory/apache/ memory.memsw.limit_in_bytes
9223372036854775807
The value for memory.memsw.limit_in_bytes is not being initialized. I
cannot find any related errors in /var/log. I have tried a number of
different values for memory.memsw.limit_in_bytes, however it will not
initialize properly. The only error I can see occurs when I restart
the cgroups service:
Stopping cgconfig service: rmdir: failed to remove `./smb': Device or
resource busy
sed: couldn't flush stdout: No such process
rmdir: failed to remove `./sysdefault': Device or resource busy
sed: couldn't flush stdout: No such process
rmdir: failed to remove `./sysdefault': Device or resource busy
sed: couldn't flush stdout: Invalid argument
rmdir: failed to remove `./sysdefault': Device or resource busy
*
Starting cgconfig service:
What else can I try in order to properly initialize
memory.memsw.limit_in_bytes? I can temporarily echo a value to it (e.g. echo
6442450944 > /mnt/cgroups/memory/apache/ memory.memsw.limit_in_bytes) which
does appear to work , but
would prefer a permanent solution.
</blockquote>
I'll try and reproduce your problem once I get the HW info above
Balbir
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