[MITgcm-support] build options for Stampede
Matthew Mazloff
mmazloff at ucsd.edu
Wed Feb 6 17:58:45 EST 2013
Hi Holly
Yeah, its only for a few specific I/O routines. Do you have a copy of you mods?
Thanks
Matt
On Feb 6, 2013, at 2:40 PM, Holly Dail <hdail at MIT.EDU> wrote:
> Hi Matt -
>
> I don't have any suggestions for _fixing_ the problem, but I can tell you what I did that drastically improved my failure rate when I had a similar issue. Just modify the code to try opening the file multiple times (maybe 3 times?) before giving up. When I faced a similar issue it was so transient that repeating the call was effective. Can't remember if a sleep was required between the attempts ... probably helpful, but will also slow down your code.
>
> Holly
>
> On Feb 6, 2013, at Feb 6 , 11:54 AM, Matthew Mazloff wrote:
>
>> Hi Angela,
>>
>> Thanks - but unfortunately stampede is different from these two machines. The good news is it is far faster -- almost 4 times faster. The bad news is that it doesn't seam to like the I/O statements in the mdsio package.
>>
>> I find it randomly trips up writing (usually with MDS_WRITE_FIELD) when the file already exists.
>>
>> The error I get is usually a simple
>>
>> "forrtl: severe (121): Cannot access current working directory for unit 9, file "Unknown"
>>
>> Though sometimes it tells me that a file that definitely exists does not exist. Or it says this file cannot be written to.
>>
>> For example, the adjoint needs some average files and it writes out some "bar" fields. Yesterday it crashed writing a "bar" file after running fine for about 2 years…
>>
>> I also find that its processors do not like to share -- I have had to give each processor its own tiled forcing file because otherwise it randomly crashes…
>>
>> However, there have been a few runs that complete just fine….
>>
>> TACC consulting do not have any suggestions. I am hoping that with the proper compile flags I can make the run more robust.
>>
>> Any suggestions appreciated!
>> Matt
>>
>>
>>
>>
>>
>>
>>
>> On Feb 6, 2013, at 5:42 AM, Angela Zalucha <azalucha at seti.org> wrote:
>>
>>> Matt: I have successfully used TACC's Lonestar and Ranger machines, but won't be in front of a real computer until tomorrow night, when I can send you the opt files.
>>>
>>> Angela
>>>
>>> p.s. I can also send you results for scaling tests, and would be interested to know how stampede works out for you. For instance I find that lonestar is a lot faster than ranger. I am actively proposing to XSEDE.
>>>
>>> Sent from my Verizon Wireless 4G LTE DROID
>>>
>>>
>>> Matthew Mazloff <mmazloff at ucsd.edu> wrote:
>>>
>>> Hello,
>>>
>>> Has anyone made a compile options file for TACC's Stampede yet?
>>>
>>> http://www.tacc.utexas.edu/user-services/user-guides/stampede-user-guide
>>>
>>> I am getting random crashes on this machine due to disk access issues and suspect I may not be using an ideal option file.
>>>
>>> Thanks
>>> Matt
>>>
>>>
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>>
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>
>
>
>
> Holly Dail
> Postdoctoral Fellow
> Harvard University
> http://fas.harvard.edu/~hdail/
>
>
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support
More information about the MITgcm-support
mailing list