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Old 2014-02-11, 13:49   #1
MattcAnderson
 
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"Matthew Anderson"
Dec 2010
Oregon, USA

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Default short runs or long runs

Hi comrades,

I use the mmff software to utilize my GPU for Fermat factoring. I like to reserve ranges and let it run about a month and then report. I noticed that there were 10 days left in my current run, and then today, if I am not mistaken, there are already 17 days left. I don't want to make a bug report, because I may have read the number wrong last night.

One solution I have found is to break up the search range into about one day increments. But then I get long log files.

Such a fun problem.

Regards,
Matt
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Old 2014-02-11, 14:41   #2
ET_
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"Luigi"
Aug 2002
Team Italia

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Quote:
Originally Posted by MattcAnderson View Post
Hi comrades,

I use the mmff software to utilize my GPU for Fermat factoring. I like to reserve ranges and let it run about a month and then report. I noticed that there were 10 days left in my current run, and then today, if I am not mistaken, there are already 17 days left. I don't want to make a bug report, because I may have read the number wrong last night.

One solution I have found is to break up the search range into about one day increments. But then I get long log files.

Such a fun problem.

Regards,
Matt

Maybe your GPU is throttling. When a GPU gets too hot, it usually reduce its "speed" (frequency clocks) to consume less and run cooler.

Luigi
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Old 2014-02-13, 07:00   #3
MattcAnderson
 
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Dec 2010
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That's probably what it was.

Thanks Luigi.

Regards,
Matt
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Old 2014-02-16, 15:19   #4
tServo
 
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"Marv"
May 2009
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Quote:
Originally Posted by ET_ View Post
Maybe your GPU is throttling. When a GPU gets too hot, it usually reduce its "speed" (frequency clocks) to consume less and run cooler.

Luigi
Matt,
Luigi is correct about GPU throttling due to overheating. I have found another
extremely subtle cause that affects Windoze machines. I have just refurbished
an old machine and I forgot to make this change and it occurred overnight.
You must adjust the power settings in the control panel for maximum
performance. "Always On', "Never Off" for All devices, and here is the subtle
one, the screen saver MUST be set to "None". Sometimes, it can stop your
machine days after starting a mmff run!!!!

Getting back to GPU overheating, I have had this happen in a basement that is
50 degrees F !! Since I run with the case open and it was with a machine
that had only a single video card in it, I
suspect fan failure caused the GPU to over heat
I blame these cheap fans that have crummy sleeve bearings rather than decent
ball bearings that cost 1 cent more.
Perhaps LaurV is right to say water cooling is the way to go. I will try
that this summer when temps become obnoxiously high.
--Marv
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