Large memory usage

Specs:
Ubuntu 10.04 64bit
AMD Phenom X4 (2.2GHz quad core)
4GB DDR2 RAM

Problem:
When I setup mprime, I told it that it could have 512 MB of RAM day and night. I never expected it to use that much, but it recently began using very large amounts of memory (700 MB). I leave my computer running 24/7 and the problem has not fixed itself over the last 3 days. Does anyone have an explanation for why it is doing this and way to fix it (so that it doesn't use anymore than the 512 that I allocated it).

[lfm]

Originally Posted by Unregistered

Specs:
Ubuntu 10.04 64bit
AMD Phenom X4 (2.2GHz quad core)
4GB DDR2 RAM

Problem:
When I setup mprime, I told it that it could have 512 MB of RAM day and night. I never expected it to use that much, but it recently began using very large amounts of memory (700 MB). I leave my computer running 24/7 and the problem has not fixed itself over the last 3 days. Does anyone have an explanation for why it is doing this and way to fix it (so that it doesn't use anymore than the 512 that I allocated it).

Just try setting it to 350mb or so. It should still work fine and should be close then. The 512mb setting is for the P-1 stage 2. If you are doing LL tests then it should spend most of the time not using more than 100mb. It would only be doing P-1 stage 2 for a few days out of a month or two depending on just how fast your machine is.

[cheesehead]

Originally Posted by Unregistered

Problem:
When I setup mprime, I told it that it could have 512 MB of RAM day and night. I never expected it to use that much, but it recently began using very large amounts of memory (700 MB). I leave my computer running 24/7 and the problem has not fixed itself over the last 3 days.

The first question is: what type of GIMPS assignment are you running when your system exhibits this behavior? (Trial factoring, LL first-check, DC double-check, P-1 or ECM?)

For some types, your system behavior might not be unusual.

LL first-check

[lfm]

Originally Posted by Unregistered

When I setup mprime, I told it that it could have 512 MB of RAM day and night. I never expected it to use that much, but it recently began using very large amounts of memory (700 MB). I leave my computer running 24/7 and the problem has not fixed itself over the last 3 days. Does anyone have an explanation for why it is doing this and way to fix it (so that it doesn't use anymore than the 512 that I allocated it).

BTW the 512MB is for the main large data structures only, not including any of the misc memory for code or smaller data areas.

[cheesehead]

Originally Posted by lfm

BTW the 512MB is for the main large data structures only,

But only during P-1 stage 2 or ECM stage 2, not during L-L.

[cheesehead]

Originally Posted by Unregistered

LL first-check

Okay.

The LL first-check assignment might run a TF or P-1 before the actual Lucas-Lehmer test. Have you seen any messages about "factoring" or "P-1" being in progress?

[rudi_m]

BTW even when P-1 is finished it may still use large memory because of this bug:
http://mersenneforum.org/showthread.php?t=11468

[cheesehead]

Thanks for the reminder, Rudi!