What are these files output by CUDALucas?

ICWiener · 2018-06-16, 15:53

I know that CUDALucas creates a checkpoint file when the computations are interrupted, so that they may be resumed from there later on. However, instead of one checkpoint file, I get two:

cM***, and
tM***,

where *** denotes the prime Mersenne exponent. Unfortunately, these files are not documented in the README of CUDALucas. What do they store?

LaurV · 2018-06-16, 16:07

They store the partial residue (checkpoint file) and its backup, so you can resume a test when your electricity fails, even if that happened during the program was writing the checkpoint file (i.e. destroying it).

ICWiener · 2018-06-16, 16:10

Thank you! The "c" prefix was obvious, but I didn't understand the "t"...

kriesel · 2018-06-16, 17:04

And there are conditions where both the c file and the t file might be bad. For that, if you have already enabled periodic savefiles in a subfolder, there may be a chance to continue from an earlier file which may be good. Otherwise start over.

2018-06-16, 15:53	#1
ICWiener Jun 2018 17 Posts	What are these files output by CUDALucas? I know that CUDALucas creates a checkpoint file when the computations are interrupted, so that they may be resumed from there later on. However, instead of one checkpoint file, I get two: cM*, and tM, where ** denotes the prime Mersenne exponent. Unfortunately, these files are not documented in the README of CUDALucas. What do they store?

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2018-06-16, 16:07	#2
LaurV Romulan Interpreter "name field" Jun 2011 Thailand 41×251 Posts	They store the partial residue (checkpoint file) and its backup, so you can resume a test when your electricity fails, even if that happened during the program was writing the checkpoint file (i.e. destroying it).

2018-06-16, 16:10	#3
ICWiener Jun 2018 17 Posts	Thank you! The "c" prefix was obvious, but I didn't understand the "t"...

2018-06-16, 17:04	#4
kriesel "TF79LL86GIMPS96gpu17" Mar 2017 US midwest 2⁴·3·163 Posts	And there are conditions where both the c file and the t file might be bad. For that, if you have already enabled periodic savefiles in a subfolder, there may be a chance to continue from an earlier file which may be good. Otherwise start over.