Re: NCL and stdout

Thanks, great tip. That worked for me!

On Sun, Oct 20, 2013 at 12:10 PM, Sean Egan <sdegan@alaska.edu> wrote:

> Hi all,
>
> The supercomputing center that I'm using found out that it is a buffering
> issue. I guess most versions of linux come with a program written at NIST
> called "unbuffer". When I execute
>
> unbuffer ncl program.ncl >> output.txt 2>&1 &
>
> I get the output I expect.
>
> Just thought I'd share that with you.
>
> Cheers,
>
> Sean in Alaska
>
>
> On Fri, Oct 18, 2013 at 4:35 AM, Carl Schreck <cjschrec@ncsu.edu> wrote:
>
>> Dave & Sean,
>>
>> I've noticed similar behavior for a while. In Sean's example, program.out
>> will have content once the script finishes running, but not before. Hence
>> why tail -f doesn't seem to do anything.
>>
>> I haven't tried tee yet, maybe that'll help. One other quirky workaround
>> I have found:
>>
>> print( "Hello" ) doesn't appear in the log file until the script finishes
>>
>> BUT
>>
>> system( "echo Hello" ) shows up immediately.
>>
>> Carl
>>
>>
>> On Thu, Oct 17, 2013 at 6:53 PM, David Brown <dbrown@ucar.edu> wrote:
>>
>>> Hi Sean,
>>> I experimented with your scenario and I do get output in the file and I
>>> can see it using 'tail -f'. Is there a lot of output? If not, it could be a
>>> buffering issue. The OS may not output its internal buffer until it fills
>>> up.
>>> If you run the program to completion does the program.out file remain
>>> empty? That would definitely be weird. The OS should flush the buffers when
>>> the script exits.
>>>
>>> Maybe try using 'tee' and see if it gives better results.
>>>
>>> ncl program.ncl | tee program.out
>>>
>>> This should output to the terminal and to the file simultaneously.
>>> If this doesn't help, let us know.
>>> -dave
>>>
>>>
>>> On Oct 17, 2013, at 4:09 PM, Sean Egan <sdegan@alaska.edu> wrote:
>>>
>>> > I have a curious bash issue that I need help with.
>>> >
>>> > When I execute
>>> >
>>> > ncl program.ncl > program.out &
>>> > tail -f program.out
>>> >
>>> > I receive no output. The program continues to run in the background,
>>> but the file "program.out" remains empty. When I run
>>> >
>>> > ncl program.ncl
>>> >
>>> > I immediately receive output. Why is the redirect not working in this
>>> case?
>>> >
>>> > Is this something unique to NCL or is this a problem with the way I
>>> have my shell profile setup?
>>> >
>>> > Just curious,
>>> >
>>> > Sean Egan
>>> > University of Alaska Fairbanks
>>> > _______________________________________________
>>> > ncl-talk mailing list
>>> > List instructions, subscriber options, unsubscribe:
>>> > http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>
>>
>>
>> --
>>
>> <http://www.cicsnc.org/>
>> Follow CICS-NC on Facebook <http://www.facebook.com/cicsnc>
>> *Carl J. Schreck III, PhD*
>> *Research Associate*
>> Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
>> North Carolina State University <http://ncsu.edu/>
>> NOAA's National Climatic Data Center <http://ncdc.noaa.gov/>
>> 151 Patton Ave, Asheville, NC 28801
>> e: cjschrec@ncsu.edu
>> o: +1 828 257 3140
>> CycloneCenter.org: Help analyze tropical cyclones<http://www.cyclonecenter.org/>
>> monitor.cicsnc.org/mjo: See recent MJO diagnostics<http://monitor.cicsnc.org/mjo/>
>>
>
>

-- 
 <http://www.cicsnc.org/>
Follow CICS-NC on Facebook <http://www.facebook.com/cicsnc>
*Carl J. Schreck III, PhD*
*Research Associate*
Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
North Carolina State University <http://ncsu.edu/>
NOAA's National Climatic Data Center <http://ncdc.noaa.gov/>
151 Patton Ave, Asheville, NC 28801
e: cjschrec@ncsu.edu
o: +1 828 257 3140
CycloneCenter.org: Help analyze tropical cyclones<http://www.cyclonecenter.org/>
monitor.cicsnc.org/mjo: See recent MJO
diagnostics<http://monitor.cicsnc.org/mjo/>

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Mon Oct 21 11:23:50 2013