Mersenne: Re: Timing(?) errors

1999-09-21 Thread Steinar H. Gunderson
On Mon, Sep 20, 1999 at 05:45:17PM -0500, Willmore, David wrote: Since it's a cache reading problem there's no real way to 'flush' it. Normally, that means to write back dirty data to whatever backing store exists, not 'invalidate everything'. Even if you did, it would't solve the problem. How

Re: Mersenne: Iteration Times (was: GIMPS client output)

1999-09-21 Thread James Escamilla
Wouldn't the run time at 4.231 be about 10 years? --- Eric Hahn [EMAIL PROTECTED] wrote: Okay, okay... obviously a lot of people were awake sigh (you can stop flooding me with emails!!) In a previous message I wrote: P.S. At the 79.3M range, you'll probably not want to set it at 100

RE: Mersenne: Re: Timing(?) errors

1999-09-21 Thread Willmore, David
On Mon, Sep 20, 1999 at 05:45:17PM -0500, Willmore, David wrote: Since it's a cache reading problem there's no real way to 'flush' it. Normally, that means to write back dirty data to whatever backing store exists, not 'invalidate everything'. Even if you did, it would't solve the problem.

Mersenne: FDIV Pentium error

1999-09-21 Thread Floris Looyesteyn
I was wondering if Prime95 is affected by the Pentium FDIV bug. (or some name like that). I ask this because now i'm also using it on my laptop (great work george!) and when i installed linux some time ago it said the processor had this bug. Floris Looyesteyn

Re: Mersenne: FDIV Pentium error

1999-09-21 Thread Lars Lindley
I was wondering if Prime95 is affected by the Pentium FDIV bug. (or some name like that). I ask this because now i'm also using it on my laptop (great work george!) and when i installed linux some time ago it said the processor had this bug. It should not be a problem because Linux

Mersenne: Re: Re: Timing(?) errors

1999-09-21 Thread Steinar H. Gunderson
On Tue, Sep 21, 1999 at 02:03:54PM -0500, Willmore, David wrote: Correct, it does not. Normally, though, when you're swapping, proper L2 cache coloring is the least of your performance problems. Yes, but if you _force_ swap-out-swap-in, like ReCache does? /* Steinar */ -- Homepage:

Mersenne: Re: FDIV Pentium error

1999-09-21 Thread Steinar H. Gunderson
On Tue, Sep 21, 1999 at 09:25:02PM +0200, Floris Looyesteyn wrote: I was wondering if Prime95 is affected by the Pentium FDIV bug. (or some name like that). I've run it with on a P60 (with the FDIV bug) for 2-3 years now (at least pre-PrimeNet), and it has never been a problem. Remember that the

RE: Mersenne: Re: Re: Timing(?) errors

1999-09-21 Thread Willmore, David
Random chance. I wouldn't count on it. -Original Message- From: Steinar H. Gunderson [SMTP:[EMAIL PROTECTED]] Sent: Tuesday, September 21, 1999 4:12 PM To: [EMAIL PROTECTED] Subject: Mersenne: Re: Re: Timing(?) errors On Tue, Sep 21, 1999 at 02:03:54PM -0500, Willmore,

Re: Mersenne: Prime95 v19 oops...

1999-09-21 Thread George Woltman
Hi, At 10:09 PM 9/20/99 +0300, Jukka Santala wrote: Something I forgot from earlier playing, the manual factoring savefiles on Prime95 v19 at least don't work out too well especially on dual-CPU machines... Since these savefiles will always be named "p000" regardless of the -A parameter and

Mersenne: Factoring

1999-09-21 Thread Eric Hahn
Does anybody know if there is an exponent where the factor is, or know whether there is a proof on whether a factor can (or can't) be, a root?? A square?? To clarify this: We know that any factor of 2^p-1 is in the form 2kp+1. Letting x =2, Can (2kp+1)^x = 2^p-1 ?? Can (2kp+1)^x *

Re: Mersenne: v19 manual workdodo.ini error.

1999-09-21 Thread George Woltman
Hi, At 02:42 PM 9/18/99 +0200, Lars Lindley wrote: I discovered a lost exponent in the team-report and thought I would reassign that exponent for myself. I manually edited the worktodo.ini by adding the row DoubleCheck=3393469,61 on the first line. I thought that prime95 would put the exponent I

Mersenne Digest V1 #629

1999-09-21 Thread Mersenne Digest
Mersenne Digest Tuesday, September 21 1999 Volume 01 : Number 629 -- Date: Sun, 19 Sep 1999 21:36:01 -0400 From: Jeff Woods [EMAIL PROTECTED] Subject: Re: Mersenne: M(M(127)) and other M(M(p)) At 08:51 PM 9/19/99

Re: Mersenne: Factoring

1999-09-21 Thread Jud McCranie
At 04:27 PM 9/21/99 -0700, Eric Hahn wrote: We know that any factor of 2^p-1 is in the form 2kp+1. Letting x =2, Can (2kp+1)^x = 2^p-1 ?? Can (2kp+1)^x * (2kp+1) ... = 2^p-1 ?? No known factors of Mersenne numbers have x1, but it hasn't been proven that it is impossible.

Re: Mersenne: Iteration Times (was: GIMPS client output)

1999-09-21 Thread Eric Hahn
At 09:47 AM 9/21/1999 -0700, James Escamilla wrote: Wouldn't the run time at 4.231 be about 10 years? Yes, for that particular exponent (79,299,959), it would take approx. 10 yrs. and 231 days to test. That's assuming 4 items: 1) A P2 266MHz PC was being used the entire time. 2) The PC was

Re: Mersenne: FDIV Pentium error

1999-09-21 Thread poke
All programs are affected by the FDIV bug. It is a bug in the design of the microprocessor. Linus has a way around it. The brain dead morons at Microsoft have to make everyone else wait for a solution (That has yet to come AFIK). Linux on the other hand usually has problems solved in a matter of

Re: Mersenne: M(M(127)) and other M(M(p))

1999-09-21 Thread Chris Nash
Hi folks Wait, that might just be the reason to search! Will only searched up to k=4 for M(M(6972593)), but if 2*k*M(p)+1 divides M(M(p)), then you've just beaten the world record! Non-Mersenne's might once again grace the top 10 list! I really hope that neither Will Edgington (with