Memory leak in Prime95, Win64, v25.11b2?

joblack · 2010-06-15, 08:35

I've got a Q6600 with 8 GByte RAM, Win 7 64 Bit Ultimate and Prime95, Win64, v25.11b2. As I'm not using most of my memory at the moment I thought about increasing the memory settings in 'CPU Settings and Information over 4 GByte.

Not a good idea. It works if the memory is under 4 GByte but if I put a number greater than 4 GByte (i.e. 4500) it seems to have a memory leak and tries to get more and more memory (observed in the Task Manager) until it starts swapping.

Seems to be a memory leak or is it a 'feature' ;)?

S485122 · 2010-06-15, 17:13

I have got a Q6700 with 8 GiB RAM, XP 64 bits and do not experience such a problem. The memory setting for prime95 is 7307 MiB, i.e. the maximum allowed on such a setup. One core is dedicated to P-1. I only reboot the machine once a month as an aftermath of patch Tuesday.

How many threads where doing what ?

Jacob

joblack · 2010-06-15, 17:55

Quote:

Originally Posted by S485122

I have got a Q6700 with 8 GiB RAM, XP 64 bits and do not experience such a problem. The memory setting for prime95 is 7307 MiB, i.e. the maximum allowed on such a setup. One core is dedicated to P-1. I only reboot the machine once a month as an aftermath of patch Tuesday.

How many threads where doing what ?

Jacob

I have 4 threads, one was doing some P-1 (the rest is LL) because it had to check a new number.

Isn't the memory usage not for the whole program? At least the task manager is showing the accumulated memory need.

science_man_88 · 2010-06-15, 23:21

are you only running prime95 if not I can see how a memory leak may occur (in fact I'm reading parts of the art of assembly 2nd edition and I've read a bit about memory leaks) basically lets say the OS uses 25% if any other programs use more than 25% if prime 95 needs the full 4 GiB left or more than what's left then a memory leak occurs. so i think it could be possible. if other programs are open either find a way for them to use less memory (which might slow them down) or it can occur anytime something else memory hungry goes on.

joblack · 2010-06-16, 13:42

Quote:

Originally Posted by science_man_88

are you only running prime95 if not I can see how a memory leak may occur (in fact I'm reading parts of the art of assembly 2nd edition and I've read a bit about memory leaks) basically lets say the OS uses 25% if any other programs use more than 25% if prime 95 needs the full 4 GiB left or more than what's left then a memory leak occurs. so i think it could be possible. if other programs are open either find a way for them to use less memory (which might slow them down) or it can occur anytime something else memory hungry goes on.

The 32 Bit / 4 GByte barrier isn't a problem in Windows XP/Vista/7 64 Bit. Every process can have a huge virtual memory.

lfm · 2010-06-17, 16:56

Quote:

Originally Posted by joblack

I've got a Q6600 with 8 GByte RAM, Win 7 64 Bit Ultimate and Prime95, Win64, v25.11b2. As I'm not using most of my memory at the moment I thought about increasing the memory settings in 'CPU Settings and Information over 4 GByte.

Not a good idea. It works if the memory is under 4 GByte but if I put a number greater than 4 GByte (i.e. 4500) it seems to have a memory leak and tries to get more and more memory (observed in the Task Manager) until it starts swapping.

Seems to be a memory leak or is it a 'feature' ;)?

Ya, it would be a bug specific to 64 bit systems. Why are you trying to give so much memory to prime95 anyway? Aren you running 4 p-1 jobs at once? Even then you shouldn't need or really be able to use that much memory so far as I know.

joblack · 2010-06-17, 18:33

Quote:

Originally Posted by lfm

Ya, it would be a bug specific to 64 bit systems. Why are you trying to give so much memory to prime95 anyway?

Because I can ;).

Quote:

Originally Posted by lfm

Aren you running 4 p-1 jobs at once? Even then you shouldn't need or really be able to use that much memory so far as I know.

You can't have enough memory for P-1. Even if I don't have my focus on p-1 higher numbers sometimes needs a pre-checking and I don't want to calculate for over a year only to get a composite result.

science_man_88 · 2010-06-17, 23:41

I didn't say 4 gib was the limit lol reread.

lfm · 2010-06-18, 15:14

Quote:

Why are you trying to give so much memory to prime95 anyway?

Because I can ;).

Well, actually it seems you can't. :-)

joblack · 2010-06-19, 19:59

Quote:

Originally Posted by lfm

Well, actually it seems you can't. :-)

I can, Prime95 can't. ;)

S485122 · 2010-06-19, 21:01

Quote:

Originally Posted by lfm

Well, actually it seems you can't. :-)

Quote:

Originally Posted by joblack

I can, Prime95 can't. ;)

Prime95 can't on your machine : no problems on mine. Of course I use XP not some DRM software pretending to be an OS ;-)

Jacob

2010-06-15, 08:35	#1
joblack Oct 2008 n00bville 2³·7·13 Posts	Memory leak in Prime95, Win64, v25.11b2? I've got a Q6600 with 8 GByte RAM, Win 7 64 Bit Ultimate and Prime95, Win64, v25.11b2. As I'm not using most of my memory at the moment I thought about increasing the memory settings in 'CPU Settings and Information over 4 GByte. Not a good idea. It works if the memory is under 4 GByte but if I put a number greater than 4 GByte (i.e. 4500) it seems to have a memory leak and tries to get more and more memory (observed in the Task Manager) until it starts swapping. Seems to be a memory leak or is it a 'feature' ;)?

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2010-06-15, 17:13	#2
S485122 Sep 2006 Brussels, Belgium 1686₁₀ Posts	I have got a Q6700 with 8 GiB RAM, XP 64 bits and do not experience such a problem. The memory setting for prime95 is 7307 MiB, i.e. the maximum allowed on such a setup. One core is dedicated to P-1. I only reboot the machine once a month as an aftermath of patch Tuesday. How many threads where doing what ? Jacob

2010-06-15, 23:21	#4
science_man_88 "Forget I exist" Jul 2009 Dumbassville 2⁶×131 Posts	are you only running prime95 if not I can see how a memory leak may occur (in fact I'm reading parts of the art of assembly 2nd edition and I've read a bit about memory leaks) basically lets say the OS uses 25% if any other programs use more than 25% if prime 95 needs the full 4 GiB left or more than what's left then a memory leak occurs. so i think it could be possible. if other programs are open either find a way for them to use less memory (which might slow them down) or it can occur anytime something else memory hungry goes on.

2010-06-17, 23:41	#8
science_man_88 "Forget I exist" Jul 2009 Dumbassville 2⁶×131 Posts	I didn't say 4 gib was the limit lol reread.