Memory Allocation Error: grid storage

[Arlindo da Silva]

On Mon, Jan 26, 2009 at 5:27 PM, Chris Butenhoff <cbutenhoff at yahoo.com>wrote:

> On my attempt to display a variable in Grads v1.9b4 I receive the following
> message:
>
> >>>Memory Allocation Error:  grid storage
> >>>Data Request Error:  Error for variable 'lc'
>
> The open file is about 600 Mb in size and has a lon/lat grid of
> 40320x16353.
>

Let's do the math. The size of the file hardly matters as it may include
compression. Grads v1.9b4 holds gridded data in 4 byte floats.  So, a
singlevariable at your grid resolution would require:

40320*16353*4/(1024*1024) ~ 2.5 GB

So, you could be very close to your memory limit of 3GB. The particular
format also matters; there is a known memory leak with some form of
netcdf/hdf file.


>
> My machine has over 3 Gb of RAM so I assume the memory limit must be set in
> Grads.
>
> Searching the archives I find the following info:


> >>> "The limit of the cache size is (for now) hard-coded in gaio around
> >>> line 76:
> >>> #define MAXG2CACHE 500100100
> >>> You can change this and recompile if you want to limit or expand your
> >>> memory usage."
>
> Before attempting, does anyone have experience with this problem, and is
> this the right fix?
>

 This is a Grib-2 specific issue, certainly not an issue with v1.9b4 which
does not support Grib-2.

--
Arlindo da Silva
dasilva at alum.mit.edu
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