[gradsusr] Slow performance using 'sum'

[Dan Leins]

I'm running version 2.0.a9


Dan
On Sun, Feb 12, 2012 at 10:49 PM, Arlindo da Silva <
arlindo.dasilva at gmail.com> wrote:

> Which version of grads is this?
>
> Sent from my iPhone
>
> On Feb 11, 2012, at 11:06 PM, Dan Leins <theedge981 at gmail.com> wrote:
>
> > All,
> >
> > I have a GrADS script I use, among other things, to calculate run total
> precip over my model domain throughout my model run (output format is
> grib2). I create images of numerous fields on an hourly basis (say 72hrs
> worth for example), so I produce 72 runtotal precip images. As the script
> runs and iterates through a loop, my code to calculate the runtotal looks
> like this:
> >
> > 'define runtotal=sum(apcpsfc.1, t=2, t='dis_t')'
> > 'display runtotal'
> >
> > where dis_t is the hour I am currently working on.
> >
> > My script works fine and fast early on, but slows down over time.
> Naturally, I assume the amount of time it takes to 'sum' hours of precip
> will increase as I get further into my run. However, if I kill and restart
> my script at an arbitrary time (dis_t=60) for example, this calculation
> speeds right back up again.   Likewise if I comment out this portion of my
> script, the rest of my script moves along at the same pace the entire time.
> I'm thinking some resources aren't being released properly while the script
> is running since the problem seems to go away if I kill/restart my script.
> >
> > Is there a more efficient way to calculate a runtotal than the method
> shown above?  I've been careful to undefine any variables after each
> iteration of my loop so I don't think that's a factor.
> >
> > Any help would be great!
> > Thanks,
> > Dan Leins
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