[Nek5000-users] Compilation flags on BG/Q

[nek5000-users at lists.mcs.anl.gov]

Hi Hesam,

I would recommend using mpixlf77/mpipxlc.  In general, c32 mode seem to work better but it is always a good idea to test.

I am not aware of any other tunings improving Nek performance on BG/Q.

Best.
Aleks



----- Original Message -----
From: nek5000-users at lists.mcs.anl.gov
To: nek5000-users at lists.mcs.anl.gov
Sent: Tuesday, October 15, 2013 4:57:16 PM
Subject: Re: [Nek5000-users] Compilation flags on BG/Q

Hi Aleks

thanks for the quick reply. Also, would you recommend gcc or xlf 
compiler? what about ranks-per-node? Also in the makenek.inc, you have 
BG flag for /L and /P, I was wondering if you know the optimum tunings 
for /Q ?

Regards,
Hesam



On 13-10-15 05:22 PM, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Hesam,
>
> According to an earlier work of our ALCF Catalyst, using a combination of -O3 and -qhot was improving the performance in previous generations of BG/Q compilers so further testing could be helpful.
>
> Best.
> Aleks
>
>
> ----- Original Message -----
> From: nek5000-users at lists.mcs.anl.gov
> To: nek5000-users at lists.mcs.anl.gov
> Sent: Tuesday, October 15, 2013 3:56:20 PM
> Subject: [Nek5000-users] Compilation flags on BG/Q
>
> Dear Neks
>
> I was wondering if anyone here could give me the recommended set of
> compilers and flags for running nek on BG/Q so that I could modify
> makenek. I guess the experienced users of Mira could be of great help.
>
> Regards,
> Hesam
>
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