screen running mprime disappears

[Prime95]

I've been running the dream machine for a year. It was recommended that I use crontab and screen to start mprime:

@reboot screen -S mprime -d -m /home/george/prime95/mprime -d

On 6 CPUs I've had nary a problem. On the 7th CPU, four times I've discovered that screen is not running. Three of those times was after a reboot. One of those times it was after the machine was running for 7 days.

How can I figure out why mprime or screen is aborting without a trace?

[chalsall]

Originally Posted by Prime95

How can I figure out why mprime or screen is aborting without a trace?

Unless you need interactive console control of the process, screen is a bit of overkill; and it doesn't provide great logging.

I usually run mprime something like:

./mprime -d </dev/null >>mprime.log 2>>mprimee.log &

You can then tail / grep through the log files at any time for diagnostics.

[ric]

Originally Posted by Prime95

How can I figure out why mprime or screen is aborting without a trace?

Have you tried enabling logging? something along

@reboot screen -L -S mprime -d -m /home/george/prime95/mprime -d

This should turn on automatic output logging for the windows, and direct it to a screenlog.n (n = window number) in your home folder - and maybe give you some hints about what happens

[Prime95]

Originally Posted by ric

Have you tried enabling logging?

Thanks, I'll try that.

It could be months before it happens again, so success/failure feedback may be a bit slow!