Mersenne Digest Monday, November 17 2003 Volume 01 : Number 1092
---------------------------------------------------------------------- Date: Fri, 14 Nov 2003 14:23:37 -0800 (PST) From: Quantum Mechanic <[EMAIL PROTECTED]> Subject: Mersenne: Re: Mersenne Digest V1 #1091 Matthias Waldhauer wrote: > <[EMAIL PROTECTED]> > Subject: Re: Mersenne: 50% CPU? > > Quantum Mechanic wrote: > > I have an Intel 4 box from MDG, 1 CPU, 2.4GHz, > 512MB > > RAM, L1 8KB, L2 512KB. > > > > Prime95 is only getting 50%, with System Idle > Process > > taking 50%. > > > > It's currently running an LL test in the 20M > range. > > > > Any ideas why it's only 50%? > > I think, there are 2 processes running as idle task > (one of them is > Prime95). And I assume that both have the same > priority setting, so the > OS "thinks", they are equally important (same > priority) and gives > exactly half of the available time to each of them > because > Hyperthreading suggests, that there are enough real > CPUs to do so > (although there aren't). > > Try increasing Prime95's priority setting. I turned off Hyperthreading, and I get 99% of the CPU on Prime95, with the same iteration times as before. So it's just an accounting trick. [I wonder if Enron knows about this?] - -QM ===== ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Quantum Mechanics: The dreams stuff is made of __________________________________ Do you Yahoo!? Protect your identity with Yahoo! Mail AddressGuard http://antispam.yahoo.com/whatsnewfree _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sun, 16 Nov 2003 11:48:19 -0700 From: "p k" <[EMAIL PROTECTED]> Subject: Mersenne: Re: Mersenne Digest V1 #1091 In your BIOS settings there should be something called Logical CPU or something similar. Just turn it off. >From: [EMAIL PROTECTED] (Mersenne Digest) >Reply-To: [EMAIL PROTECTED] >To: [EMAIL PROTECTED] >Subject: Mersenne Digest V1 #1091 >Date: Fri, 14 Nov 2003 13:19:15 -0800 > >Mersenne Digest Friday, November 14 2003 Volume 01 : Number >1091 > > > > >---------------------------------------------------------------------- > >Date: Tue, 11 Nov 2003 08:14:55 +0100 >From: Matthias Waldhauer <[EMAIL PROTECTED]> >Subject: Re: Mersenne: 50% CPU? > >Quantum Mechanic wrote: > > I have an Intel 4 box from MDG, 1 CPU, 2.4GHz, 512MB > > RAM, L1 8KB, L2 512KB. > > > > Prime95 is only getting 50%, with System Idle Process > > taking 50%. > > > > It's currently running an LL test in the 20M range. > > > > Any ideas why it's only 50%? > >I think, there are 2 processes running as idle task (one of them is >Prime95). And I assume that both have the same priority setting, so the >OS "thinks", they are equally important (same priority) and gives >exactly half of the available time to each of them because >Hyperthreading suggests, that there are enough real CPUs to do so >(although there aren't). > >Try increasing Prime95's priority setting. > >Regards, >Matthias > >_________________________________________________________________________ >Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm >Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers > >------------------------------ > >Date: Fri, 14 Nov 2003 13:16:53 -0800 >From: "Robert Braunwart" <[EMAIL PROTECTED]> >Subject: Mersenne: Re: Mersenne Digest V1 #1088 > >Hi, > >One of my computers just had a hard-disk failure and a new one installed. >I >had the Prime95 directory backed up, but when I copied it over and ran >Prime95 I got the message that one of the numbers was not assigned to this >computer. Can I get it back? It was nearly done. The number was >Test=20630641,66,0. This is my first number over 20 million and I would >like to finish it. > >- --Bob Braunwart > >_________________________________________________________________ >MSN Messenger with backgrounds, emoticons and more. >http://www.msnmessenger-download.com/tracking/cdp_customize > >_________________________________________________________________________ >Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm >Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers > >------------------------------ > >End of Mersenne Digest V1 #1091 >******************************* > _________________________________________________________________ Great deals on high-speed Internet access as low as $26.95. https://broadband.msn.com (Prices may vary by service area.) _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Mon, 17 Nov 2003 21:23:36 -0500 From: George Woltman <[EMAIL PROTECTED]> Subject: Mersenne: 40th Mersenne Prime found As you may already know, a user has reported discovering the 40th known Mersenne prime! In the wake of the false prime report a few months ago, we added a few failsafes to quickly detect a false report. Fortunately, this user was using the new version of prime95. He emailed me the save file with 2000 iterations remaining. I reran those final iterations and my computer also reports this number prime - in my mind eliminating any chance of a hardware error. Unfortunately, we still must go through the official different machine, different program verification which will probably end in early December. So please be patient awaiting the disclosure of the number. Waiting for verification saved us from a huge embarrassment last time! Oh yes, hints. I've always given hints. The prime number is more than five million digits and less than ten million digits. Congratulations to all!! GIMPS has done it again! _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ End of Mersenne Digest V1 #1092 *******************************
