[MITgcm-support] bluesky build

[Baylor Fox-Kemper]

Hi Mike,
   Are you using singlecpuio or useglobalfiles?  Those can be very slow 
in mpi on certain systems, I think.  I can't remember now, but one of 
those really slowed down some interactive jobs I was doing at GFDL.
    Cheers,
     -Baylor

On Jun 7, 2005, at 1:43 PM, Ed Hill wrote:

> On Tue, 2005-06-07 at 11:25 -0400, Mike Spall wrote:
>> Hi All,
>>
>> I have tried compiling MITgcm on ncar's bluesky.  It seems
>> to be working in that I get no errors, but it also seems
>> to be taking a very long time.  I compiled with
>> MITgcm/tools/build_options/sp4+mpi yesterday and
>> it was not done after > 20 minutes so I killed it.
>> I was doing this interactively, not by batch.
>> Does this sound right?
>
> Hi Mike,
>
> This is only a guess, but it sounds like the very slow build could be
> due to slow disk I/O.  Please contact the bluesky admins since there is
> almost nothing that we can do about it from our side.
>
> Also, if you are doing a build on an SMP system and you have access to
> Gnu make ("gmake") or a similarly capable "make", then you can do the
> following:
>
>   ../../../tools/genamke2 ...OTHER_OPTIONS...
>   make depend
>   make -j 4
>
> where the "-j 4" specifies that four jobs should be run in parallel.  
> On
> SMP systems, this can result in huge speedups of the build.  For
> instance, "-j 3" on dual-processor Opterons and "-j 16" on some Altix
> systems can provide massive (approximately, x2 and x14) speedups of the
> compilation stage.
>
> Ed
>
> -- 
> Edward H. Hill III, PhD
> office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
>              Cambridge, MA 02139-4307
> emails:  eh3 at mit.edu                ed at eh3.com
> URLs:    http://web.mit.edu/eh3/    http://eh3.com/
> phone:   617-253-0098
> fax:     617-253-4464
>
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support