Hyperthreading and 50% CPU time used.

badgr152 · 2003-12-04, 12:16

I'm a newbie. Using Athlon 1800. Norton Utilities says my CPU is working 100%.....
P-1 factoring M21457771 with B1=335000, B2=335000
M21457771 Stage 1 is 33.03% complete. Time 3247.690 sec.

Is this what I should be seeing ???

Prime Monster · 2003-12-04, 12:55

Yes, what you are seeing looks right.

PM

TauCeti · 2003-12-04, 12:57

Quote:

Originally posted by badgr152
I'm a newbie. Using Athlon 1800. Norton Utilities says my CPU is working 100%.....
P-1 factoring M21457771 with B1=335000, B2=335000
M21457771 Stage 1 is 33.03% complete. Time 3247.690 sec.
Is this what I should be seeing ???

Yes. Looks good. Your system will continue with Stage 1 and then start Stage 2 of factoring. That will take some hours. If no factor of M21457771 is found during those stages, the LL-test will start.

At the end of the LL-Test (that test will take at least some weeks to complete) you will know if M21457771 is prime or not. If it is prime, you are famous :) Even if it is not prime, your work will appear in the stats and your system will start crunching the next number...

Tau

ET_ · 2003-12-04, 12:57

Wait...

Quote:

B1=335000, B2=335000

Shouldn't it be B1=335000, B2=33500000?

Luigi

apocalypse · 2003-12-04, 13:17

That depends on how much memory is available. If there is not enough to run stage 2 in a meaningful way, the client will increase the B1 bound and skip stage 2.

badgr152 · 2003-12-04, 13:48

This brings up a second point...I have 512mb memory and I'm using Win 98...I'm not too sure if more than 256mb of memory is being used. At boot up the BIOS says 490 odd memory but this doesn't necessarily mean Win 98 is using it ??

TauCeti · 2003-12-04, 16:23

Win98 is able to use 512MB of memory (but not equally efficient compared to 2k or xp).

The memory-settings you make in the prime95-client only affect the factoring (phase 2) and that phase is only using 2% of the total running time of a test.

Because of this, please make sure that you do not use too much memory for prime95. Keep enough for the operating system and the other applications.

Even using only 8MB for prime95 will be sufficient. You can find even more information about this topic in the readme.txt

P.S.: With more then 512MB you run into problems using Win98. Check MS KB 304943 for more information.

2003-12-05, 01:40

I have a P4, and when i run the program, the task manager says that im only using 50% of the CPU. I think this has something to do with the Hyper-Threading, but i would like to make sure. If this is the case, how can i make it so it is using 100%?

2003-12-05, 02:47

Easiest way is to disable hyper-threading. But just seeing that 50% of 2 processors(one virtual, one actual) shows that one is working at 100%.

GP2 · 2003-12-05, 03:05

Quote:

Originally posted by Say What?
I have a P4, and when i run the program, the task manager says that im only using 50% of the CPU.

What operating system are you using? If it's an older operating system, it's probably just giving you a bogus report of 50% because it doesn't understand the hyperthreading used in modern Pentium 4 chips.

It's possible to disable hyperthreading in your BIOS, but whether it's necessary or advisable to do so might depend on which older operating system you're using, hence the question.

xtreme2k · 2003-12-05, 05:06

Quote:

Originally posted by Say What?
I have a P4, and when i run the program, the task manager says that im only using 50% of the CPU. I think this has something to do with the Hyper-Threading, but i would like to make sure. If this is the case, how can i make it so it is using 100%?

If you are using Windows XP or above that is absolutely fine. Prime will run at full speed dispite the task manager says 50%. The reason the T.M. says its 50% because there seems to be 2 cpu and there is only 1 thread running in one of the CPU. Therefore the 50%. But it DOES RUN at 100% speed so there is no nothing to worry.

But if you are running Win2k. Disable HT or else you will get a ~50% hit in Prime95 speed.

2003-12-04, 12:16	#1
badgr152 Dec 2003 2₁₆ Posts	Hyperthreading and 50% CPU time used. I'm a newbie. Using Athlon 1800. Norton Utilities says my CPU is working 100%..... P-1 factoring M21457771 with B1=335000, B2=335000 M21457771 Stage 1 is 33.03% complete. Time 3247.690 sec. Is this what I should be seeing ???

2003-12-04, 16:23	#7
TauCeti Mar 2003 Braunschweig, Germany 2×113 Posts	Win98 is able to use 512MB of memory (but not equally efficient compared to 2k or xp). The memory-settings you make in the prime95-client only affect the factoring (phase 2) and that phase is only using 2% of the total running time of a test. Because of this, please make sure that you do not use too much memory for prime95. Keep enough for the operating system and the other applications. Even using only 8MB for prime95 will be sufficient. You can find even more information about this topic in the readme.txt P.S.: With more then 512MB you run into problems using Win98. Check MS KB 304943 for more information. Last fiddled with by TauCeti on 2003-12-04 at 16:28

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2003-12-04, 12:55	#2
Prime Monster Aug 2002 2²·5·13 Posts	Yes, what you are seeing looks right. PM

2003-12-04, 13:17	#5
apocalypse Feb 2003 2·3·29 Posts	That depends on how much memory is available. If there is not enough to run stage 2 in a meaningful way, the client will increase the B1 bound and skip stage 2.

2003-12-04, 13:48	#6
badgr152 Dec 2003 2₁₆ Posts	This brings up a second point...I have 512mb memory and I'm using Win 98...I'm not too sure if more than 256mb of memory is being used. At boot up the BIOS says 490 odd memory but this doesn't necessarily mean Win 98 is using it ??

2003-12-05, 01:40	#8
Say What? 10010111011101₂ Posts	I have a P4, and when i run the program, the task manager says that im only using 50% of the CPU. I think this has something to do with the Hyper-Threading, but i would like to make sure. If this is the case, how can i make it so it is using 100%?

2003-12-05, 02:47	#9
Unregistered 3239₁₀ Posts	Easiest way is to disable hyper-threading. But just seeing that 50% of 2 processors(one virtual, one actual) shows that one is working at 100%.