Installation and running of mkfactc

[daxmick]

I've downloaded v0.21 and read the README.

It appears that some knowledge of using CUDA is needed prior to using this software. (Knowledge that, alas, I don't have.) I have CUDA 9.0 installed (I think) on a Ubuntu 17.10 machine but I don't know where to go from here.

The README references a /src directory but there is no such directory in the v0.21 directory.

What am I missing? Does someone have a more detailed set of instructions on how to get this up and running? :-)

[Mark Rose]

If you already have an mfaktc.exe, you can just run that.

Otherwise there should be a src directory. In that you made need to edit the Makefile to point a couple of variables to the right place, before you run `make`.

[daxmick]

Originally Posted by Mark Rose

If you already have an mfaktc.exe, you can just run that.

Otherwise there should be a src directory. In that you made need to edit the Makefile to point a couple of variables to the right place, before you run `make`.

I’m not in front of that computer right now but I did run “mfaktc.exe -h” and got an error.

Try untar’ing the v0.21 Linux 64 file. There is no src directory. There is a lib directory though but that didn’t help.

[Luis]

You should run

./mfaktc.exe -h

or

try this command

LD_LIBRARY_PATH="./lib:${LD_LIBRARY_PATH}" ./mfaktc.exe -h

[daxmick]

Originally Posted by Luis

You should run

./mfaktc.exe -h

or

That is what I tried before.

Originally Posted by Luis

try this command

LD_LIBRARY_PATH="./lib:${LD_LIBRARY_PATH}" ./mfaktc.exe -h

This appears to have worked! I at least got the HELP output. :-) On to the next phase. <insert dramatic music here>

Thank you for your help.

[daxmick]

It appears that mfaktc v0.21 is compiled for CUDA 6.5. I have CUDA 9.0.

So, should I uninstall 9.0 and install 6.5 instead? Or where do I get the source of mfaktc so I can build a binary for CUDA 9.0. (Assuming I can figure out how to do that.)

[chalsall]

Originally Posted by daxmick

It appears that mfaktc v0.21 is compiled for CUDA 6.5. I have CUDA 9.0. So, should I uninstall 9.0 and install 6.5 instead?

If mfaktc successfully completes the full self-test

./mfaktc.exe -st

...there should be no need to down-grade your CUDA, nor recompile against 9.0.

[daxmick]

That is where I learned what it was looking for. Here is the output of running with the "-st" arg: (Note the last line.)

daxm@ultraman:~/mersenne/mfaktc-0.21$ ./runme.sh -st
mfaktc v0.21 (64bit built)

Compiletime options
  THREADS_PER_BLOCK         256
  SIEVE_SIZE_LIMIT          32kiB
  SIEVE_SIZE                193154bits
  SIEVE_SPLIT               250
  MORE_CLASSES              enabled

Runtime options
  SievePrimes               25000
  SievePrimesAdjust         1
  SievePrimesMin            5000
  SievePrimesMax            100000
  NumStreams                3
  CPUStreams                3
  GridSize                  3
  GPU Sieving               enabled
  GPUSievePrimes            82486
  GPUSieveSize              64Mi bits
  GPUSieveProcessSize       16Ki bits
  Checkpoints               enabled
  CheckpointDelay           30s
  WorkFileAddDelay          600s
  Stages                    enabled
  StopAfterFactor           bitlevel
  PrintMode                 full
  V5UserID                  (none)
  ComputerID                (none)
  AllowSleep                no
  TimeStampInResults        no

CUDA version info
  binary compiled for CUDA  6.50
  CUDA runtime version      -104.-5
  CUDA driver version       9.0
ERROR: CUDA runtime version must match the CUDA toolkit version used during compile!

Here is my bash script to account for the library requirement:

daxm@ultraman:~/mersenne/mfaktc-0.21$ cat runme.sh 
#!/bin/bash

LD_LIBRARY_PATH="./lib:${LD_LIBRARY_PATH}" ./mfaktc.exe $1

[chalsall]

Originally Posted by daxmick

That is where I learned what it was looking for. Here is the output of running with the "-st" arg: (Note the last line.)

Hmmm... OK.

I would next try compiling mkfactc in your enviromment; it's not that hard.

Downgrading CUDA is also an option, but I've found it can be a royal pain in the butt (I've burnt through many an Amazon VM with failed attempts).

[daxmick]

Originally Posted by chalsall

Hmmm... OK.

I would next try compiling mkfactc in your enviromment; it's not that hard.

Downgrading CUDA is also an option, but I've found it can be a royal pain in the butt (I've burnt through many an Amazon VM with failed attempts).

Do you have source code? The link http://www.mersenneforum.org/mfaktc/ doesn't provide source (and it's the only link I know of for getting mfaktc code).

[chalsall]

Originally Posted by chalsall

I would next try compiling mkfactc in your enviromment; it's not that hard.

Actually, this brings up a point...

@Oliver... Perhaps it's time to update http://www.mersenneforum.org/mfaktc/ and make it possible to find precompiled executables for CUDA 9, and easier to find the source code?

For example, perhaps mfaktc-0.21.tar.gz could be renamed mfaktc-0.21_src.tar.gz?