#116 Minimum RAM to use in digifits

[Mugundhan]

Hi,

I'm trying to get some guppi files dedispersed, and write as psrfits for further processing. When I try this with digifits without a RAM size, it suggests a size, but when I include that in the command line, it doesn't seem to have been recognized by the program.. An example copied below with the error I get:

digifits -U 8192 -o /media/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240611T110000_SE607/ar/B0531+21_60472_39599_16070.fits -b 8 -p 4 -t 0.00032768 -T 16.384 -F 122:D -D 56.778 -K -do_dedisp /media/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240611T110000_SE607/raw/B0531+21_60472_39599_16070.raw
dsp::GUPPIFile::open_file WARNING assuming that first and only header is correct
digifits: requested tsamp=0.00032768 rate=195312
actual tsamp=0.00032768 (tscrunch=64)
digifits: input data not detected
digifits: performing coherent dedispersion at 56.778
digifits: creating 122 by 131072 back channel filterbank
digifits: dedispersion filter length=131072 (minimum=16384) complex samples
digifits: 122 channel convolving filterbank requires 131072 samples

Error::stack
dsp::LoadToFITS::prepare
dsp::SingleThread::set_block_size
Error::InvalidState
Error::message
insufficient RAM: limit=256 MB -> block=0 samples
require=131072 samples -> a minimum of "-U 4982.5" on command line

I tried in different variations, but to no avail.

Mugundhan

[Willem van Straten]

Hi Mugundhan,

I'm not able to reproduce this error on my end, but I did find some duplicated handling of the -U option. I've deleted the duplicate code on a development branch. Could you please try it out on your end? To get the experimental code, please run

cd dspsr
git pull
git checkout bugs-116-digifits-min-ram

and then build and install.

Cheers,
Willem

[Willem van Straten]

Hi Mugundhan,

Have you had an opportunity to test out the code on the bugs-116-digifits-min-ram branch?

Cheers,
Willem

[Mugundhan]

Hi Willem,

No, I still haven't tried this and I've been in parental leave and vacation. So I'll try to test this once I get back in December. Sorry for the delay.

Sent from Outlook for iOShttps://aka.ms/o0ukef

---

From: bugs@dspsr.p.re.sourceforge.net bugs@dspsr.p.re.sourceforge.net on behalf of Willem van Straten straten@users.sourceforge.net
Sent: Tuesday, November 26, 2024 4:21 AM
To: [dspsr:bugs] 116@bugs.dspsr.p.re.sourceforge.net
Subject: [dspsr:bugs] #116 Minimum RAM to use in digifits

Hi Mugundhan,

Have you had an opportunity to test out the code on the bugs-116-digifits-min-ram branch?

Cheers,
Willem

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[bugs:#116]https://sourceforge.net/p/dspsr/bugs/116/ Minimum RAM to use in digifits

Status: open
Group: version_1.0
Created: Thu Aug 01, 2024 12:43 PM UTC by Mugundhan
Last Updated: Fri Aug 02, 2024 01:31 PM UTC
Owner: nobody

Hi,

I'm trying to get some guppi files dedispersed, and write as psrfits for further processing. When I try this with digifits without a RAM size, it suggests a size, but when I include that in the command line, it doesn't seem to have been recognized by the program.. An example copied below with the error I get:

digifits -U 8192 -o /media/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240611T110000_SE607/ar/B0531+21_60472_39599_16070.fits -b 8 -p 4 -t 0.00032768 -T 16.384 -F 122:D -D 56.778 -K -do_dedisp /media/mugundhan/1d46be89-271a-4dcc-aca0-a12aafaf2b1d/data/proj51/sess_sid20240611T110000_SE607/raw/B0531+21_60472_39599_16070.raw
dsp::GUPPIFile::open_file WARNING assuming that first and only header is correct
digifits: requested tsamp=0.00032768 rate=195312
actual tsamp=0.00032768 (tscrunch=64)
digifits: input data not detected
digifits: performing coherent dedispersion at 56.778
digifits: creating 122 by 131072 back channel filterbank
digifits: dedispersion filter length=131072 (minimum=16384) complex samples
digifits: 122 channel convolving filterbank requires 131072 samples

Error::stack
dsp::LoadToFITS::prepare
dsp::SingleThread::set_block_size
Error::InvalidState
Error::message
insufficient RAM: limit=256 MB -> block=0 samples
require=131072 samples -> a minimum of "-U 4982.5" on command line

I tried in different variations, but to no avail.

Mugundhan

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[Willem van Straten]

No worries! Enjoy your time on leave!