[daip] IMAGR query

[Shami Chatterjee]

Hi:
I'm running IMAGR on a VLA-A data set, spectral line (2 IFs, 7
channels/IF) and it appears to be grinding away for ever (over
1 hr now on an Sun Ultra 30 with 256 MB RAM) on the first gridded
subtraction.

I'm wondering if this is expected, or whether it is thrashing,
and I should restart with less ambitious parameters.

Here are some parameters, and what I'm seeing:
AIPS 1: IMAGR: Wide field imaging/Clean task
AIPS 1: NPOINTS       7                    Number of chan. to average.
AIPS 1: CHINC         1                    Channel incr. between maps.
AIPS 1: BIF           1                    First IF in average.
AIPS 1: EIF           2                    Last IF in average.
AIPS 1: CELLSIZE      0.2         0.2      (X,Y) size of grid in asec
AIPS 1: IMSIZE     2048        2048        Minimum image size
AIPS 1: NFIELD        2                    Number of fields (max. 512)
AIPS 1: DO3DIMAG      1                    > 0 => use different tangent
AIPS 1: FLDSIZE    *all 0                  Clean size of each field.
AIPS 1: RASHIFT       0         720        RA shift per field (asec)
AIPS 1:            *rest 0
AIPS 1: DECSHIFT      0        -840        DEC shift per field (asec)
AIPS 1:            *rest 0
AIPS 1: ROBUST        3                    Robustness power: -5 -> pure
AIPS 1: GAIN          0.1                  Clean loop gain
AIPS 1: FLUX          0                    Minimum Clean component (Jy)
AIPS 1: MINPATCH    101                    Min. BEAM half-width in AP.


> IMAGR1: BGC Clean: using 1547 cell beam + residuals >     2.61 MilliJy
> IMAGR1:     2434 Residual map points loaded
> IMAGR1: Field   2 min. algorithm flux =  -8.923 MilliJy iter= 201
> IMAGR1: Field   2 Cleaned flux density =  789.725 MilliJy  201 comps
> IMAGR1: Total Cleaned flux density    =  789.725 MilliJy   201 comps
> IMAGR1: ALGSTB: Only  153 Rows In AP (Need   817)
> IMAGR1: ALGSTB: Ipol gridded model subtraction, chans 1 through 14
> IMAGR1: ALGSTB: Pass   1;  806- 664 Cells, with        0 Pts
> IMAGR1: ALGSTB: Pass   2;  805- 663 Cells, with        0 Pts
> IMAGR1: ALGSTB: Pass   3;  805- 663 Cells, with        0 Pts
> IMAGR1: ALGSTB: Pass   4;  805- 663 Cells, with        0 Pts
> IMAGR1: ALGSTB: Pass   5;  805- 663 Cells, with        0 Pts
[...]
> IMAGR1: ALGSTB: Pass 199;  805- 663 Cells, with        0 Pts
> IMAGR1: ALGSTB: Pass 200;  805- 663 Cells, with        0 Pts
[...]
> IMAGR1: ALGSTB: Pass1399;  805- 663 Cells, with        0 Pts
> IMAGR1: ALGSTB: Pass1400;  805- 663 Cells, with        0 Pts

How long is this expected to continue?
Thanks for your help,
Shami