Re: [ferret_users] Memory allocation problem

["William S. Kessler" <william.s.kessler@xxxxxxxx>]

There may be a hard limit on memory allocation: about 500 "words".

In that case, an alternate way to SAVE large time series files using  
smaller amounts of memory is to append (along the time axis only):

save/file=filename.cdf/l=1 temperature
repeat/l=2:NPTS/file=filename.cdf/append temperature

Where NPTS is the total number of timesteps.
To avoid screen spew, you could do it in chunks by hand:

save/l=1:500/file=filename.cdf/clobber temperature
save/l=501:1000/file=filename.cdf/append temperature
save/l=1001:1500/file=filename.cdf/append temperature
...etc...

But this can only be done along the time axis, which is expandable in  
netcdf. Appending along other axes requires predefining the length of  
the axis and the grid. There is a discussion of this in the  
documentation under netcdf.

Billy K

On 9 Jan 10, at 10:28 AM, steeven paul yerraguntla wrote:

> Dear ferreters,
>    I am using the a nc file of size 1GB, which is in external hard  
> disc. when my Jnl file is being executed, an error message is  
> appearing saying insufficient memory. Jnl file is meant for to  
> define time axis of weekly data.  Execution of jnl file can be seen  
> in the following lines.
>
> I hope somebody can help me with some idea. Thanks in advance.
>
> ---------------------------------------------------------------
> NOAA/PMEL TMAP
> FERRET v6
>
> Linux(g77) 2.4.21-32 - 08/23/06
>
> 9-Jan-10 23:18
>
>
> set mem/size=600
>
> Cached data cleared from memory
>
> cancel da/all
>
> use temp_8609.cdf
>
> define axis/t=07-JUL-1986:27-dec-2009/npoints=1430/units=days tweekly
>
> let temperature = temp[gt=tweekly@asn]
>
> save/file=temp_raghu_8609.cdf/clobber temperature
>
> **ERROR: insufficient memory: 314263950 words were requested.
>
> LIST/FORMAT=CDF/file=temp_raghu_8609.cdf/clobber temperature
>
> Command file, command group, or REPEAT execution aborted
>
> *** NOTE: You can use SET MEMORY/SIZE=xxx to increase memory.
>
> *** NOTE: The "Memory use" section of the FERRET Users Guide has  
> further tips
>
> ---------------------------------------------------------------------- 
> -----------------------------------------------------------
>
>
> --
> Steeven Paul Y
> Research Fellow
> NIO RC Vizag
> 176 Lawsons Bay Colony
> Visakhapatnam - 530017