AIPS HELP file for SIZEFILE in 31DEC21
As of Tue Oct 26 22:14:48 2021
SIZEFILE: return file size, IMAGR work file size estimate
INNAME Input UV data (name)
INCLASS Input UV data (class)
INSEQ Input UV data (seq. #)
INDISK Input UV data disk drive #
NCHAV 1.0 Number of chan. to average.
BIF First IF in average.
EIF Last IF in average.
FSIZE @ File size in Megabytes or
@ estimate work file Mbytes
Use: This verb returns adverb FSIZE giving the size of the primary
file in Megabytes. If the file is a single-source UV file and
at least one of NCHAV, BIF, EIF is > 0 (before application of
defaults), then the FSIZE returned will be the estimated size
of the IMAGR work file produced from the input file with
application of the adverbs.
Note that your IMAGR work file may be smaller than estimated
if you use adverbs like TIMERANGE, DOCALIB, etc. which can
cause some of the visibilities to be omitted from the workfile.
This is why the verb does not even try to estimate the workfile
size for multi-source files for which IMAGR would require the
SOURCE adverb to select a single source for imaging.
This verb may provide information useful in the determination
of the value to give to the SETMAXAP verb. If the size of the
work file is so large that it is certain that it cannot be held
in memory, then one should set the maximum AP size as large as
one can, being certain that all of the "AP" is held in memory
and does not swap. If the size of the workfile is small
enough, be sure to leave enough memory for it as well as for
the specified AP memory. Don't forget that other processes
like AIPS itself and the TV as well as the basic operating
system require memory.
INNAME.....Input UV data file (name). Standard defaults.
INCLASS....Input UV data file (class). Standard defaults.
INSEQ......Input UV data file (seq. #). 0 => highest.
INDISK.....Input UV data file disk drive #. 0 => any.
NCHAV......NCHAV is the number of channels to be averaged together
in in the gridding process. 0 => 1.
BIF........The lowest numbered IF to include. Multiple IFs can be
included in a bandwidth synthesis average. 0 => 1.
EIF........The highest numbered IF to include. 0 =>highest.
FSIZE......The size of the input file or the size of the IMAGR work
file in Megabytes.