RE: Mersenne: double-check mismatches

[Hoogendoorn, Sander]

> Is any statistix on double-check mismatches available?
> How often this happens?

See http://www.mersenneforum.org/showthread.php?s=&threadid=1116

Combined error rate is between 3 and 4%
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RE: Mersenne: M2161 has a factor

[Hoogendoorn, Sander]

Gerry Snyder wrote:

> M2161 was number 10 on the list of smallest Mersenne numbers with no
> known factor.

Number 14 actually, you forgot the four numbers below 1200.

Sander
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RE: Mersenne: MPrime as an exponent

[Hoogendoorn, Sander]

 
> M(31) is also the first Mersenne prime not to be tested 
> as an exponent in a Mersenne prime as it is 10 digits 
> or over 2 billion, well beyond the current 16mil or 
> even 33mil exponents being tested.

Take a look at Tony Forbes page
http://www.ltkz.demon.co.uk/ar2/mm61.htm

MM31 has 3 known factors so there is no need to test it's primality

MM61 is the first one without a known factor

Sander
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RE: Mersenne: ECM

[Hoogendoorn, Sander]

>>   If trial-factoring has been done up to 2^68... is it
>> possible to skip testing ECM curves for factors up to 15
>> and/or 20 digits... and go straight to testing ECM curves
>> for digits up to 25 digits???

> Personally, I would go straight in at the 25+ digits level.

OTOH, if trial factoring has been done to 2^68 on a Mersenne number then the
number is probably quite big (IIRC) so it will take a long time to run just
a single curve with a big B1.

Sander
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Mersenne: Task Manager

[Hoogendoorn, Sander]

 
Jud McCranie wrote:

> On Windows XP ctrl-alt-del shows that information (maybe on Win 2000
> too).

On both W2K and XP you also have to press the Task Manager Button, or
press ctrl-shift-esc to go there right away

Sander
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RE: Mersenne: Like missing baby's first step

[Hoogendoorn, Sander]

> I think it is more the following situatiuon:

> 95+% done, connecting to prime.net -> GET NEW WORK !! ->  start with 
> new work !

> After 5-7% the old workfile gets it's active flag back and will be 
> completed.

The work done on the new exponent is either trail factoring or P-1
factoring. Trail factoring on the new exponent is unlikely because the trail
factored exponents are way ahead of the first time LL tests. When the P-1
test is finished or when there is not enough memory available to complete
the test the LL test on the old exponent continues. The LL test on the new
exponent will be started after the LL test in the old exponent is finished.

> This situation is really b*llsh*t, imagine the new number is very high, 
> it tooks 1 week to complete the 7% mark and complete the old nonprime.

This is done to make sure your computer has always some work queued up in
case a factor is found and your computer is not online or the primenet
server is unavailable. In this situation there is more time to get a new
exponent after the factor is found.

Sander
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RE: Mersenne: 33mio exponents

[Hoogendoorn, Sander]

Guido Lorenzini wrote:

> 1st observation:
> the "beerman's" computer named SKA4 seems to work simultaneously on 4
> 33mio exponents, since each exponent is getting iterations: how it 
> come? If any Cpu is best working on just one copy of prime95, even a 
> dual cpu PC should have 2 computer ID...You may see the same situation 
> with DEJEFLATERIC of netconx, but, once again, these are just examples.

It is possible to use the same computer ID for several computers. This can
happen if you copy the prime95 directory to other computers. For example
when installing prime95 over a network, or when cloning a disk to another
pc.

> 2nd:
> Sometimes it happens that an exp. is assigned to an unspecified computer
> ID (for example, the account "kpgcfd", has some). Is it possible?

Yes, you can leave the computer ID blank. If you leave your account ID blank
the primenet server asigns you one.
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RE: Mersenne: Proth observations

[Hoogendoorn, Sander]

Andy Hedges wrote:
 
> Anyone have any idea why for k = 659 there are very little primes? In
> fact for k up to 20 there are none (I haven't found any in this
> range yet!).

This number has bees searched till at least 27
Take a look at http://www.prothsearch.net/rieselsearch.html
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RE: Mersenne: Proth observations

[Hoogendoorn, Sander]

Brian J. Beesley Wrote:

> My strategy is:

> (1) run Proth at medium priority in factoring only mode to eliminate 
> candidates with "small" factors;

For step 1 i use Newpgen. I think this is better configurable then proth in
how far or long you want to factor. Don't know which is the fastest of the
two.

> (2) on the same system, run PRP at low priority to check the 
> survivors from stage 1 for probable primes;
> (3) on a different system (normally running Prime95), run Proth at 
> medium priority to verify the probable primes. (If you don't have a 
> "spare" system it would be best to do this in a seperate directory so 
> as to save keep changing the Proth setup!)

> BTW so far _every_ probable prime I've found using PRP has been 
> accepted as a genuine prime by Proth, though this is certainly not 
> guaranteed.

Same here
 
> If you break the run down as above you will see that some values of k 
> yield a much smaller proportion of candidates for psuedo-prime 
> testing than others. Or, to put it another way, some values of k give 
> a much higher percentage of k.2^p-1 with "small" factors than others.

For some k's you have to test more the twice as many candidates in the same
range of n's

Sander
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RE: Mersenne: Different results

[Hoogendoorn, Sander]

>Hello,
>
>1) When testing a new Pc, I obtain two different results from the old and
the new one
>
>M9357637 is not prime. Res64: BCB1164E6826255E. WW1:
C4F561C3,5448242,
>M9357637 is not prime. Res64: BCB1164E6826255E. WW1:
C4F261C3,5448242,0003
>
>Are this results compatible ?

The 64 bits residue's are the same. The WW1 is the version number to see
which version of prime95 ran the test.
C4F261C3 is a checksum generated by the program to make sure the result is
really produced by the programm.
Don't know what 5448242 stands for, but the last part is an error counter so
the second one has had 3 errors.

Sander
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RE: Mersenne: graphical image of factoring work being done

[Hoogendoorn, Sander]

Henk Stokhorst wrote:

> I wrote a small program in Delphi that uses the 'nofactor' 
> files produced by 'decomp' as input to create a graphical 
> image of the work that has been performed on factoring.

Thanks, this is something i've been looking for, much easier
then importing the file into Excel (which can handle only
65536 lines) and sorting it.

I found a bug in the program though, when you use a nofactor
file which doesn't start with 1 the horizontal scale is
incorrect.

Further, is it possible to stretch the scale so that only the
part for which there is data in de nofactor file is displayed?
And can you tell the difference between the red and black bars?

Thanks

Sander
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RE: Mersenne: LL question

[Hoogendoorn, Sander]

> But what if the mod M comes out to 1 on one of
> the intermediate steps?  Then 1^2 - 2 = -1
> Then what?  spike

Then you will be stuck in a loop, same thing happens when the outcome is
-2, -1, 0 and 2
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Mersenne: Status reports (was: reports corrupt?)

[Hoogendoorn, Sander]

Siegmar Szlavik wrote:

 > btw: would it be possible to get those huge 
 > status.txt and cleared.txt files in a compressed
 > (gzip?) format? This would definitively save 
 > download time and bandwith...

And can they be split up between doublechecks,
first time test and factoring assingnements?
This would also save a lot of time when checking
1st time and factoring tests.

Sander
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Mersenne: Hybernation

[Hoogendoorn, Sander]

>> I personally don't mind a P100 running full LL tests; they are a small,
but
>> usefull contribution to our effort.

I still use an old p100 and p166 to do a full LL test in the 9M range, but i
do check in regularly and make sure that i won't hold up a new milestone.

But i got another question, does anybody have experiance with prime95 and
hybernation?
Does the program pickup where it left correctly?

Sander
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Mersenne: Unofficial milestone!

[Hoogendoorn, Sander]

Hi,

Today we reached 100.000 cleared exponents since last synchronization on
primenet.
When will the next synchronization be?
The list with cleard exponents is getting a bit to long to download that
often.
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Mersenne: OT: Home Primes

[Hoogendoorn, Sander]

A bit Off Topic, but i finaly had time to put some data i have of Home
Primes
(I.E. repeated factorizations of concatenated prime factors) online.
In case you're interested http://www.geocities.com/home_primes
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RE: Mersenne: bug in Wordpad?

[Hoogendoorn, Sander]

> Whenever I have a large file (about 3.000 lines) with 
> exponents to test
> (extracted from the nofactor.cmp file) and replace all the 
> 'Test=' with
> 'Factor=' using wordpad (part of windows accesoires) one line gets to
> read 'Factorst='.

You can extract with the -w option to get Factor= infront of each line

see the readme file
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RE: Mersenne: Re: Double check validity

[Hoogendoorn, Sander]

> George Woltman wrote:

>If the first and second tests were done by the same user, then my program
>prompts me as to whether I really want to accept this result.  I usually
>accept the double-check for the following reasons:
> 1)  It is not uncommon for top producers to get assigned a
> double-check where they did the first test.
> 2)  It is not uncommon for folks to "screw up" the setup in
> multi-machine environments.  A process called "ghosting"(?)
> results in the prime95 directory being copied from a central
> server.  Now each machine has the same worktodo.ini file.
> Some users make the same mistake manually setting up
> multiple machines initially.

But in this case the program doesn't use a different shift count, does it?
It could also be that the p and q files are also copyed to another machine 
and if there already is an error in those files the residues still match.
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RE: Mersenne: Primenet status report

[Hoogendoorn, Sander]

>I noticed a while ago that the Primenet server started reporting "v19/v20"
in
>the "Ver" column. When this showed only one version, it was useful to help
>determine which machines needed to be upgraded. Now it makes it impossible
to
>distinguish between v19 and v20, which I'd like to do to make sure all my
>machines can do P-1 factoring.

>Why wasn't the individual version number preserved? Can this be changed in
>future versions of Prime95 and/or the Primenet server?

It would also be useful to see the minor version number in the status
report.
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Mersenne: Re: GIMPS Banners(was:exaflops)

[Hoogendoorn, Sander]

Well, actually i use the banners from http://www.mersenne.org/ips/banners/

I hope these will also be updated, but it looks like i have to change the
script
when i have time.

>That's cool!  Right after I send this E-mail I'm going to update my web
site 
>and remove the old banners directory. This will break your images if you've

>linked to my directory directly.  However, I have a completely new and 
>good-looking gallery page (still at http://mersenne.cjb.net ) that presents

>all of the new .PNG images (and a new banner) and I also have a ZIP file of

>all the banners.  Hopefully, this will result in faster load times for 
>everyone.  :-D  I won't be making GIF images ever again.

>Stephan Lavavej
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RE: Mersenne: Motherboard Temperature

[Hoogendoorn, Sander]

Michael Bell wrote:

>Soory to be a little off topic, can somebody tell me how hot a motherboard
>should be running?  I have a Celeron 466 and an ASUS P2B-B.  It claims to
be
>42 degrees after some days of continuous use.  Is this normal?

Is this the cpu temp or the mainboard temp?
Think 42 for the mainboard is a bit high, maybe your videocard is close to
the sensor?
My asus P2B with overclocked PII has a cpu temp of 45 and a mainboard temp
of 29 degrees
The MB temp is always 7 to 8 degrees above room temp and the cpu 15 to 17
degrees above that.

Sander
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RE: Mersenne: Trouble with new DSL connection, Part 2

[Hoogendoorn, Sander]

>>All was well until Prime95 needed to contact the server.
>>Then I got the message 
 
>>Dial-up connection not active.
>>Will try contacting server again in 2 minutes.
 
>>When I reported this to [EMAIL PROTECTED], several people responded with
>>the suggestion that I deselect the 'Use a dial-up connection to the
>>Internet' box in the Test/Primenet menu. When I did this the message
>>changed to Error 2250, which appears every 60 minutes.
 
>>I am at a loss about how to proceed. Can anyone help?


You can leave the 'Use a dial-up connection to the
Internet' selected and increase the time in Options/preferences/minutes
between modem retries.

You could also select 'do not contact primenet server automatically'
in advanced/manual communication.

You'll then have to make manual communication at least once every two months
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Mersenne: ILLEGAL SUMOUT

[Hoogendoorn, Sander]

Hi,

Finally i've got them, the illegal sumout error.
I'm 100% sure it's a software error, 'cause the are reproducable when
playing
F1 2000. Anyone else this problem?
Are the caused by the game, or by the new direct x version I installed (7a i
believe)
or do i have a driver problem?

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RE: Mersenne: Facelift (round 2)

[Hoogendoorn, Sander]

>1)  I dumped the mouse rollover and replaced the 44 different menu
>gifs with one navbar gif.  This should help our European friends
>suffering from slow load times due to downloading separate gif files.
 
If you use a seperate frame for the menu you only need to download the gifs
once
 
>2)  The text now wraps around the navbar.  Some found the white space
>below the navbar ugly.  I'm not convinced this is any better.
 
Don't like the white space either, but this doesn't look better
 
>3)   The status table should display OK in netscape.
 
Looks ok in IE5, wit text size on smaller or smallest
 
>4)  The MSIE improperly terminated string bug is not fixed.  I actually
>think its a bug in MSIE.
 
Haven't seen any errors
 
>The latest incarnations can be viewed at:

 
>http://www.mersenne.org/newhtml/prime.
 htm
  
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RE: Mersenne: Facelift

[Hoogendoorn, Sander]

>4)  Is this too slow to download?  Would you rather not have the
>mouse rollover feature (it adds to the .gif files downloaded).

No, not for mee (64k isdn)

>5)  Would you rather I use frames so the menu does not scroll?

yes, it would be better, also the menu should fit on one screen, so no
picture ???

>6)  Is the link to hitbox at the very bottom too annoying?  (I get free
>web stats by using this).

No, not for me, but maybe the logo's could be side by side


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RE: Mersenne: Prime 95 Speeds

[Hoogendoorn, Sander]

>I worked that excel sheet up using the information available at
>http://www.mersenne.org/bench.htm; 

Goerge,

There still isn't a link to this page from youre pages.
The current link still points to the old benchmark page
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RE: Mersenne: V20.1.1 P-1 Factoring

[Hoogendoorn, Sander]

At 07:48 PM 3/24/00 +, Brian J. Beesley wrote:
>Did the first start - or finish Stage 1 - at a time of day when
>memory to run stage 2 was not available?

And George Woltman wrote:
>Both day and night settings would need to be 8MB to omit stage 2.
>If day is 8MB and night is 32MB then prime95 waits until nighttime
>to run stage 2.

Prime95 started to do the P-1 factoring after i upgraded, and before 
i changed the available nighttime memory to 32MB.
Stage 1 did finish in nighttime, so there would be enough available 
memory for stage 2.
Does this mean that the bound for stage 2 is determined on the available 
memory when stage 1 is started, or is this because the available nighttime 
memory was still at 8 mb when it started the exponent?

Sander
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Mersenne: V20.1.1 P-1 Factoring

[Hoogendoorn, Sander]

The folowing exponents where factored by P-1, but why are the bounds so
different?
The first had a chance of 1.77% and the other two about 3.7% to find a
factor .

UID: sanderh/PC, M5542549 completed P-1, B1=7, B2=7, WW1: 8F7EF481
UID: sanderh/PC, M5542723 completed P-1, B1=6, B2=75, WW1: 8F638A77
UID: sanderh/PC, M5547583 completed P-1, B1=65000, B2=78, WW1: 8FAE325D

BTW No problems found sofar 
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RE: Mersenne: Request for feature

[Hoogendoorn, Sander]

As long as we're asking, is it possible to slit up the Assignments Report
and the
Cleared Exponents Report into seperate lists for double checking,first time
checking and factoring, these lists get to large to download often.


-Original Message-
From: Alan Vidmar [mailto:[EMAIL PROTECTED]]
Sent: maandag 7 februari 2000 18:26
To: [EMAIL PROTECTED]
Subject: Mersenne: Request for feature


Scott,

Would it be possible to add a CPU type/speed column to the 
"Exponents Assigned" list of the "Individual Account Report"?

This info seems to be collected as the "Machines Assigned to 
PrimeNet" suggests.

Thanks,
Alan


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RE: Mersenne: The return of poaching?

[Hoogendoorn, Sander]

>Dave has at least 80 exponents reserved between 2.4M and 
>3.99M.   Eighty.   Almost all are less than suspected M37.   It is a 
>certainty that without poaching, we will have to wait until late 2000 or 
>later to prove M37, because Dave is trying to do all the double-checking 
>singlehandedly.

Not so long ago David send a mail to this list on how he's doing this.
He said:

  And now the hard and real important part:

  monitor your Account report EVERY DAY (I can't stress this enough, because

  EVERY DAY 4-5 new exponent are going to be assigned to you, if you are
only 
  able to monitor your account on the weekend modify the part* schedule and 
  Time setting, to fit your need) and keep ONLY 60 days of work for your 
  computer, use the release form on PrimeNet to release high exponent that
you 
  can't complete in 60 Days. and reorder your assignment so that the
smallest 
  exponent are finished first.

So he takes only 60 days of work for each pc.


>Most of Dave's assignments have gone untouched for 30 - 90 days.

That those exponents have gone untouched is because he is scheduling the
lowest 
exponents first and they are finished within 3 or 4 while a lot of other
exponents
take months. I saw some exponents that would expire in a few days and then
the data 
gets updated and it takes another 60 days before the exponents expire while
the LL 
test wasn't even started on those exponents.

I think David is doing a good job in completing the milestones MUCH faster.
He never poaches an exponent but lets the exponents asing by the server.
Although i agree with you that he could release some of the higher exponents
for so
that others could test them.

>If Dave gets poached, I won't shed a tear.

Nobody should poach PERIOD

>Any defense you'd like to offer for holding 9 months' work, I'll listen to,

>but I doubt you'll come up with anything convincing.

Like he said befor No more than 60 thays for each machine

Sander
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RE: Mersenne: cpu problem

[Hoogendoorn, Sander]

Maybe a bigger/better cooler helps

-Original Message-
From: Paul Cuni [mailto:[EMAIL PROTECTED]]
Sent: zondag 16 januari 2000 21:53
To: [EMAIL PROTECTED]
Subject: Mersenne: cpu problem


As to those errors I reported earlier it appears my cpu couldn't handle its 
450mhz rated speed.  Or maybe it was my motherboard.  Either way I've 
underclocked to 400mhz and the problem disappears along with the quake 3 
problems.  CPU temp went from 139 F to 130 F and mother board went from 97 
to 90F

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Mersenne: Archives

[Hoogendoorn, Sander]

> Hi,
> 
> I've been reading through the archives the last days but the last one is
> from mid 1998.
> I found a online archive but dowbloading every single message 
> takes to much time.
> 
> Is there a place where i can download the more recent archives (in one or
> two zip files)
> or can some one send them to me?
> 
> Thanks
> 
> Sander
> 
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RE: Mersenne: The list's archives

[Hoogendoorn, Sander]

I found the folowing page
http://archive.jab.org/mersenne%40base.com/

I think they go back to 14-9-1998

Sander

-Original Message-
From: poke [mailto:[EMAIL PROTECTED]]
Sent: woensdag 11 augustus 1999 4:05

On Tue, 10 Aug 1999, Shot wrote:

> Hi.
> 
> I would like to know where I can find the list's recent archives.
> 
> I followed the links from GIMPS' page, to 
> http://www.scruznet.com/~luke/archives/digest/ page. All I found 
> there were the digests dated 8 July 1996 (file v01_0001.txt) to 7 
> June 1998 (file v01_0375.txt) - these were packed into 01_001.zip to 
> 01_015.zip files. There are also unpacked files v01_0351.txt to 
> v01_408.txt, which is about (I couldn't check exactly, so I guess) 
> mid-August '98.
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RE: Mersenne: The sound of number searching

[Hoogendoorn, Sander]

Read the archives, this has been discussed 2 or 3 times before

-Original Message-
From: burlington john [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 21, 1999 19:47
To: [EMAIL PROTECTED]
Subject: Mersenne: The sound of number searching


Hello Mersenne,

  Sorry for bad english its not my native language, thanks.


  I run mprime (or prime95 ntprime) on my laptop.

  When I start the programm on my notebook it makes a strange mechanical
  pulsing sound like an old damaged wheel or like an ill cricket.
  The sound doesn't come out of the speakers and is not the fan
  from the cpu.
  First I thought it is the fan probably it is getting hotter
  and then the spin is not perfect due the heat. But when I run
  other cpu stressing programms (rc5des) there's no sound.
  Then I thougth it is the harddisk but when the harddisk goes
  to sleep mode the noise is still there.
  Then I thought the speakers could be responsible. I removed the
  soundcarddrivers moved the volume control knob to 0: still
  hear the sound.
  When I press some areas on my notebook the sound disappers for a
  few seconds but then it comes back.

  The funniest thing is when I start other cpu stressing programms
  while (m)prime is running the sound is changing. Each programm
  plus (mp)prime changes the sound in a special way so I can recognize
  exactly on the noise which programms are currently runnig.

  Why the hell is my notebook making such strange noise when running
  this programm ? Any ideas ?

  I'm goning to get crazy listening that noise all the time.




Best regards,
 Burlington  mailto:[EMAIL PROTECTED]


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RE: Mersenne: M38

[Hoogendoorn, Sander]

Took me a bit longer but has M38 has 2098960 digits ;-)

At 02:21 01.07.99 -0400, Lucas Wiman wrote:
>>The page belongs to a previous record holder...
>Took me about 30 seconds to find it.
>It's nice to see a thirty-eighth line in /root/math/ref/mers...

I didn't! Am I _that_ bad at searching the web? I looked at Gordon's page
and Roland's page (found nothing), but couldn't find Joel's page.

Help! :-)

/* Steinar */



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RE: Mersenne: IMPORTANT: BUG IN VERSION PRIME95 17

[Hoogendoorn, Sander]

Hi,

I'm at 92% off my current exponent, should i upgrade now or waste 2 more
days to produce a (possible wrong) result?

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Mersenne: Pentium III

[Hoogendoorn, Sander]

from www.tomshardware.com

Intel's new Pentium III 

The Pentium III, also known under the code name 'Katmai', does not come with
a feature that would show an immediate performance increase as in case of
the K6-3. Its basic core as well as the L2-cache architecture is identical
to the Pentium II processor. The justification for the new name lies in a
set of 70 new multimedia instructions, once known as 'KNI', now known as
'SSE' standing for 'streaming SIMD extensions'. Those new instructions
enable the CPU to perform floating-point calculations on multiple data at
the same time, which proves very helpful for 3D graphics, video encoding and
decoding and other floating point intensive applications that operate on
large sets of data.

Can this be helpfull for searching Mersenne primes???

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