[daip] FRING memory requirements

[Eric Greisen]

Ingyin Zaw wrote:
> Hello,
> 
> I'm trying to run FRING with aparm(5)=2 to solve for multiband and single 
> band delays on a file with 256 channels and 8 IFs (experiment BK114A). I 
> get the following error.
> 
> FRING1: Task FRING  (release of 31DEC09) begins
> FRING1: You are using a non-standard program
> FRING1: Doing no flagging this time
> FRING1: Selecting the data
> FRING1: Dividing data by source flux densities
> FRING1: Determining solutions
> FRING1: Doing Least Squares fits for multi- and single-band delays
> FRING1: Writing SN table    1
> FRING1: Time=   0/ 02 28 14, Polarization = 1
> FRING1: QINIT: did a GET  of      5120 Kwords, OFF   11963214967809
> FRING1: FRNSRC: MEMORY TOO SMALL FOR SPECIFIED FFT SEARCH
> FRING1: REDUCE DELAY AND/OR RATE WINDOW OR AVERAGE IN
> FRING1: FREQUENCY OR USE A SHORTER SOLINT
> FRING1: Purports to die of UNNATURAL causes
> FRING1: rglinux9 31DEC09 TST: Cpu=      0.9  Real=      1  IO=        86
> AIPS 1: Resumes
> AIPS 1: RETURN CODE      2 RECEIVED: STOPPING
> 
> I have set dparm 3 1 1 4.1 0. It seems strange that it fails for such a 
> small search window. It fails even when the search window is set to 0.1 
> nsec and 0.1 mHz. I'm not applying any calibrations or bandpass.
> 
> I'm running 31 DEC 09, 64 bit AIPS on a machine with following 
> specifications:
> Linux rglinux9.cfa.harvard.edu 2.6.18-128.1.1.el5 #1 SMP 
> Mon Jan 26 13:58:24 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
> 
> I have seen the same problem on 31 DEC 09, 32 bit AIPS as well on an 
> experiment with 512 channels and 8 IFs (BB242D).
> 
> I have made a FITS file of only the source I used for FRING for testing. 
> It's available by ftp from cfa-ftp.harvard.edu,
> User = anonymous, password = <youremailaddress>.
> The file is located at: incoming/lincoln/BK114A_2145.FITS
> 
> Please let me know what I can do to be able to run FRING with aparm(5)=2.

Needless to say FRING should not do this - I note that it only asked for 
20 Megabytes of AP memory.  It is supposed to ask for what it actually 
needs if you allow it to do so.  Have you run SETMAXAP with a small 
limit?  I would recommend set your max AP to 0.5 or 1 Gbyte on your 
64-bit computer.

If that does not work, send me your inputs and we will fetch the file 
and look at the problem.

Eric Greisen