[daip] aips query

[Patrick P. Murphy]

On Sun, 4 Mar 2001 20:39:10 -0700 (MST), Data Analysts
<analysts at aoc.nrao.edu> said: 

> ----- Begin Included Message -----

> From rji at roe.ac.uk Sat Mar  3 15:41 MST 2001
> Date: Sat, 3 Mar 2001 22:40:27 +0000 (GMT)
> From: rob ivison <rji at roe.ac.uk>
> To: analysts at cv3.cv.nrao.edu
> Subject: aips query

> please could you pass this along to the appropriate person? i'm trying to
> self-cal a file containing 3,000,000 visibilities on a machine that has
> about 512MB of memory and a lot of free disk space. i get the following
> error, even though there is clearly more than 2,134,978 blocks of free disk
> space. any idea why, or what i can do?

That figure is right at the filesystem limit of 2 Gigabytes per file,
which applies *currently* to most 32-bit operating systems.  Currently, I
believe that only Solaris and SGI (?) have AIPS support for large files
beyond this limit.  

The Linux 2.4 kernel has the ability to support larger files, and we have
confirmed this.  Work is currently under way to ensure that the Linux
version of AIPS can create files larger than 2147483648 bytes.

> CALIB1: ZCREA2: BYTES OVERFLOW ? = -2108749824

This was the clue that something was wrong; the number overflowed.

                                - Pat
-- 
  Patrick P. Murphy, Ph.D.                   Division Head, CV Computing, NRAO
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