Hi Ashan
Small stacksize sometimes causes segmentation fault,
specially on large programs like WRF.
However, it is not the only possible cause, of course.
Are you sure you set the stacksize unlimited on *all* nodes
where WRF ran?
It may be tricky.
Ask your system administrator to do it on a permanent
basis on /etc/security/limits.conf.
See 'man limits.conf'.
I hope it helps.
Gus Correa
Ahsan Ali wrote:
Hello Gus, Jody
The system has enough memory. I unlimited the stack size before
runnning WRF by the command *ulimit -s unlimited*.But he problem occured.
Thanks
Hi Ahsan, Jody
Just a guess that this may be a stack size problem.
Did you try to run WRF with unlimited stack size?
Also, does your machine have enough memory to run WRF?
I hope this helps,
Gus Correa
jody wrote:
> Hi
> At a first glance i would say this is not a OpenMPI problem,
> but a wrf problem (though io must admit i have no knowledge
whatsoever ith wrf)
>
> Have you tried running a single instance of wrf.exe?
> Have you tried to run a simple application (like a "hello world")
on your nodes?
>
> Jody
>
>
> On Tue, Feb 22, 2011 at 7:37 AM, Ahsan Ali <ahsansha...@gmail.com
<mailto:ahsansha...@gmail.com>> wrote:
>> Hello,
>> I an stuck in a problem that is regarding the running for
Weather research
>> and Forecasting Model (WRFV 3.2.1). I get the following error
while running
>> with mpirun. Any help would be highly appreciated.
>>
>> [pmdtest@pmd02 em_real]$ mpirun -np 4 wrf.exe
>> starting wrf task 0 of 4
>> starting wrf task 1 of 4
>> starting wrf task 3 of 4
>> starting wrf task 2 of 4
>>
--------------------------------------------------------------------------
>> mpirun noticed that process rank 3 with PID 6044 on node
pmd02.pakmet.com <http://pmd02.pakmet.com>
>> exited on signal 11 (Segmentation fault).
>>
>>
>>
>> --
>> Syed Ahsan Ali Bokhari
>> Electronic Engineer (EE)
>> Research & Development Division
>> Pakistan Meteorological Department H-8/4, Islamabad.
>> Phone # off +92518358714
>> Cell # +923155145014
>>
>>
Dear Jody,
WRF is running well on serial option (i.e single interface) . I am
running
another application HRM using OpenMPI , there is no issue with that and
application is running on cluster of many nodes. The wrf manual says the
following about MPI run:
I*f you have run the model on multiple processors using MPI, you
should have
a number of rsl.out.* and rsl.error.* files. Type ?tail
rsl.out.0000? to see
if you get ?SUCCESS COMPLETE WRF?. This is a good indication that
the model
has run successfully.*
*Take a look at either rsl.out.0000 file or other standard out file.
This
file logs the times taken to compute for one model time step, and to
write
one history and restart output:*
*
Timing for main: time 2006-01-21_23:55:00 on domain 2: 4.91110
elapsed
seconds.*
*Timing for main: time 2006-01-21_23:56:00 on domain 2: 4.73350
elapsed
seconds.*
*Timing for main: time 2006-01-21_23:57:00 on domain 2: 4.72360
elapsed
seconds.*
*Timing for main: time 2006-01-21_23:57:00 on domain 1: 19.55880
elapsed
seconds.*
*and*
*Timing for Writing wrfout_d02_2006-01-22_00:00:00 for domain 2: 1.17970
elapsed seconds.*
*Timing for main: time 2006-01-22_00:00:00 on domain 1: 27.66230 elapsed
seconds.*
*Timing for Writing wrfout_d01_2006-01-22_00:00:00 for domain 1: 0.60250
elapsed seconds.*
* *
*If the model did not run to completion, take a look at these standard
output/error files too. If the model has become numerically
unstable, it may
have violated the CFL criterion (for numerical stability). Check whether
this is true by typing the following:*
* *
*grep cfl rsl.error.* or grep cfl wrf.out*
*you might see something like these:*
*5 points exceeded cfl=2 in domain 1 at time 4.200000 *
* MAX AT i,j,k: 123 48 3 cfl,w,d(eta)=
4.165821*
*21 points exceeded cfl=2 in domain 1 at time 4.200000 *
* MAX AT i,j,k: 123 49 4 cfl,w,d(eta)=
10.66290*
But when I check the rsl.out* or rsl.error* there is no indication
on any
error occured ,It seems that the application just didn't start.
[pmdtest@pmd02 em_real]$ tail rsl.out.0000
WRF NUMBER OF TILES FROM OMP_GET_MAX_THREADS = 8
WRF TILE 1 IS 1 IE 360 JS 1 JE 25
WRF TILE 2 IS 1 IE 360 JS 26 JE 50
WRF TILE 3 IS 1 IE 360 JS 51 JE 74
WRF TILE 4 IS 1 IE 360 JS 75 JE 98
WRF TILE 5 IS 1 IE 360 JS 99 JE 122
WRF TILE 6 IS 1 IE 360 JS 123 JE 146
WRF TILE 7 IS 1 IE 360 JS 147 JE 170
WRF TILE 8 IS 1 IE 360 JS 171 JE 195
WRF NUMBER OF TILES = 8
Syed Ahsan Ali Bokhari
Electronic Engineer (EE)
Research & Development Division
Pakistan Meteorological Department H-8/4, Islamabad.
Phone # off +92518358714
Cell # +923155145014
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