On 3/27/13 11:52 PM, Attilio De Falco wrote:
> Just a stab in the dark, but did you check the Shared Memory kernel parameter (shmmax), type "cat /proc/sys/kernel/shmmax".  We have it set very high so that any process/thread can use as much memory as it needs.  You set the limit to 1 GB without rebooting by typing "echo 1073741824 > /proc/sys/kernel/shmmax"  or modify /etc/sysctl.conf and add the line "kernel.shmmax = 1073741824" so remains after a reboot.  I'm not sure about abinit but some fortran programs need shmmax limit to be set high…

Hi Attilio, we already had it at very high value (not sure why, I never 
changed/edited this value before)

[root@biobos:~]# sysctl -p
net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key
error: "net.bridge.bridge-nf-call-iptables" is an unknown key
error: "net.bridge.bridge-nf-call-arptables" is an unknown key
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
[root@biobos:~]# cat /proc/sys/kernel/shmmax
68719476736

Any other suggestions?

>
> On Mar 26, 2013, at 9:59 PM, Duke Nguyen <[log in to unmask]> wrote:
>
>> Hi folks,
>>
>> We have SL6.3 64bit installed on a box with two quad core and 8GB RAM. We installed openmpi, Intel Studio XE and abinit to run parallel (8 cores/processes) some of our applications. To our surprise, the system usually takes only about half of available memory (about 500MB each core) and then the job/task was killed with the low-resource error.
>>
>> We dont really understand why there is a cap of "512MB" (I guess it would be 512MB instead of 500MB) for each of our cores whereas in theory, each of the core should be able to run up to 1GB. Any suggestions/comments/experience about this issue?
>>
>> Thanks in advance,
>>
>> D.
>>