Re: NCL performance

Hi Fan,

We need more information to see if there could be an issue.

Please insert calls to "wallClockElapseTime in various sections in your script, and then rerun the script
to get more timing results. There are some examples here:

http://www.ncl.ucar.edu/Document/Functions/Contributed/wallClockElapseTime.shtml

This will help us narrow down where the problem is. Some key areas, as Dennis pointed out,
could have something to do with file I/O. It would be good to put these calls around
functions that are dealing with large arrays, and any calls to "addfile". Also, any
calls to a graphics routine might be a problem area.

Thanks,

--Mary

On Nov 29, 2010, at 11:55 AM, Fan Fang wrote:

>> uname -a
> Linux discette 2.6.18-194.11.3.el5PAE #1 SMP Mon Aug 30 17:02:48 EDT
> 2010 i686 i686 i386 GNU/Linux
>
> What I did was to install the two versions (below) at the same location,
> and doing the same command-line (same input and output paths) using the
> same script. I added "time" in front the command-line. Results below.
> Let me know if you need more info. Thanks.
>
> -Fan
>
> ncl_ncarg-5.2.1.Linux_RedHat_i686_nodap_gcc412.tar.gz:
> 172.341u 1.212s 2:54.65 99.3% 0+0k 0+0io 0pf+0w
>
> ncl_ncarg-5.1.1.Linux_i686_gcc412.tar.gz:
> 50.035u 0.579s 0:50.87 99.4% 0+0k 0+0io 0pf+0w
>
> Dennis Shea wrote:
>> There should be no performance difference.
>> All 5.2.1 updates are listed at:
>> http://www.ncl.ucar.edu/current_release.shtml
>>
>> [1] If your files are on a NFS mounted file system, perhaps the
>> network was having issues.
>>
>> [2] Whenever, you post a comment or question like this one,
>> please include the output from
>>
>> %> uname -a
>>
>> THX
>>
>> On 11/29/10 9:12 AM, Fan Fang wrote:
>>
>>> With NCL 5.2.1, we noticed a factor of ~3 reduction in performance with
>>> a x-y plot script. Our previous (and better performed) NCL version was
>>> 5.1.1. Is this expected?
>>>
>>> The script is plotting time series. There are quite a bit array
>>> manipulations in script. We haven't yet compared other scripts.
>>>
>>> -Fan
>>> _______________________________________________
>>> 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

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Mon Nov 29 15:20:09 2010