Stopping and restarting factmsieve

[EdH]

As a different experiment, if using linux, has anyone tried process pausing via CTRL-z and fg? I've been using this more lately and think I did even use it with CADO-NFS once or twice, although my memory of such is foggy.

I did just try this with YAFU and it worked quite well:

In the terminal where YAFU was running, I used CTRL-z and was given a "stopped" message.

I then did some other things like running top, which did not show any YAFU process.

Then, I entered fg and YAFU resumed without any trouble. top now shows YAFU running along again.

I will try this with Msieve later.

ETA: Just to mention that YAFU was running via a script. Other scripts should be handled the same.

[RichD]

Originally Posted by VBCurtis

This. Happens. To. Everyone.

Count me in on this one. Probably more than once.

[ThomRuley]

After the first one finished, I sent in estimated completion dates to PrimeNet, and then the assignments were automatically removed from the computer that originally had the assignments.

[chris2be8]

Originally Posted by charybdis

Isn't accidentally deleting all the relations and having to restart from scratch an important character-building experience?

I still use factMsieve.pl because I know perl but not python. I have added the following to it:

  if ( -f "$DATNAME.chk") { # Restart from checkpoint if we have one
    logwrite("#### Attempting to restart linear algebra ####");
    $cmd="$NICE \"$MSIEVE\" -s $DATNAME -l $LOGFILE -i $ININAME -v -nf $FBNAME -t $NUM_CPUS -ncr";
  } else {
    $cmd="$NICE \"$MSIEVE\" -s $DATNAME -l $LOGFILE -i $ININAME -v -nf $FBNAME -t $NUM_CPUS -nc2";
  }

Which automatically restarts it if a checkpoint file exists. It still needs manual intervention if the .chk file is corrupt (eg msieve ran out of disk space trying to write it) so I would need to go back to the previous checkpoint, but I've never had that happen.

[henryzz]

On linux ctrl-z would have been a decent way of pausing it. fg resumes it.