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Subject: Re: [hwloc-users] BGQ question.
From: Kenneth A. Lloyd (kenneth.lloyd_at_[hidden])
Date: 2014-03-26 08:49:30

Is there a difference between INK and CNK? I recall (maybe incorrectly) this was launched in an IO node.


-----Original Message-----
From: hwloc-users [mailto:hwloc-users-bounces_at_[hidden]] On Behalf Of Chris Samuel
Sent: Wednesday, March 26, 2014 6:42 AM
To: Hardware locality user list
Subject: Re: [hwloc-users] BGQ question.

On Wed, 26 Mar 2014 11:56:08 AM Biddiscombe, John A. wrote:

> I can’t test this as the system is down for maintenance, but if memory
> serves me correctly, the GCC compiled lstopo also showed 60 cores
> instead of 64/68.

It can only report what the kernel reports and it appears your kernel is not reporting the same number of cores on an IO node as ours.

It would be interesting to compare kernel version and boot command line.

Ours are:

-bash-4.1# uname -a
Linux 2.6.32-279.14.1.bgq.el6_V1R2M0_36.ppc64 #1 SMP Tue Jun 11 15:50:53 CDT 2013 ppc64 ppc64 ppc64 GNU/Linux

-bash-4.1# cat /proc/cmdline
root=/dev/ram0 rdinit=/init raid=noautodetect loglevel=5

This is the end of our /proc/cpuinfo showing 68 hardware threads
(17 cores exposed).

-bash-4.1# tail -n 9 /proc/cpuinfo

processor : 67
cpu : A2 (Blue Gene/Q)
clock : 1600.000000MHz
revision : 2.0 (pvr 0049 0200)

timebase : 1600000000
platform : Blue Gene/Q
model : ibm,bluegeneq

> I am not certain if this gcc was in any was ‘special’ for bgq.

There is a GCC cross compiler, but it's not the /usr/bin/gcc one.


 Christopher Samuel        Senior Systems Administrator
 VLSCI - Victorian Life Sciences Computation Initiative
 Email: samuel_at_[hidden] Phone: +61 (0)3 903 55545
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