[daip] VLAPROCS blew CORE

[Pedro Manuel Augusto]

Thanks a lot Eric!

On Mon, 8 May 2006, Eric Greisen wrote:

> Pedro Manuel Augusto writes:
>  > 
>  > Dear colleague,
>  > 
>  > I have AIPS installed in a Red Hat Linux System in a PC. For a few months
>  > I have been using it successfully to reduce VLA data and everything has
>  > worked fine, so far (already a few tens of maps have been produced).
>  > Today, with no apparent reason, I got  a "blew core" error when running
>  > VLAPROCS (see below). Any thoughts on the reason? The disk (only one) has
>  > 51% of capacity (18 Gb) available. Maybe some specific directory inside
>  > AIPS is full after all these maps?
> 
> The "core" it "blew" is the memory contained in the POPS language
> processor, having nothing to do with your computer.
> 
> When a POPS procedure is compiled for a second time, the memory it
> used from the first time is not recovered.  You must issue a COMPRESS
> command to recover that memory.  Note, however, that if you RUN
> VLAPROCS once you do NOT have to do it again.  The POPS memory kept

That is an importante point... and the reason why it blew...

> from one session to the next keeps the procedures compiled during that
> RUN command.  If you repeatedly RUN VLAPROCS then you will eventually
> BLOW CORE unless you also use compress.  Unfortunately, once you have
> blown core, the compress command will not (probably) work.  A RESTORE
> 0 is required followed by a RUN VLAPROCS.  Note too that the command
> CORE will show you the current state of the core usage (3 parts).
> 
> Eric Greisen
>