Mersenne Digest Tuesday, July 4 2000 Volume 01 : Number 754
----------------------------------------------------------------------
Date: Sat, 01 Jul 2000 23:24:38 +0200
From: Dennis =?iso-8859-1?Q?J=F8rgensen?= <[EMAIL PROTECTED]>
Subject: Mersenne: a question regarding setup in dualboot enviroment
Hi list
I run prime95/mprime on my personal machine, which I have dualbooting
win98SE and Linux (Redhat 6.1). So I have mprime working out of the
prime95 directory (with the -W switch).
To submit results etc. I have to connect through a proxy, so I have made
a primenet.ini file, as the readme.txt file (and ips faq) states. It
currently looks as follows:
[PrimeNet Proxy]
ProxyHost=<removed>
ProxyUser=<removed>
ProxyPass=<removed>
ProxyMask=1
EntropiaIP=216.120.70.80
This works in windows, but in Linux mprime reports "ERROR 2250: Server
unavailable". As can be seen, I have tried the faq answer
(EntropiaIP=..), without succes. Also, I remember seeing mprime report
"Illegal line in INI file: [PrimeNet Proxy]" which is ok, since this
line isn't mentioned in the Linux readme, but if I remove it, reporting
stops working in win, and mprime goes to just the 2250 error (as far as
I remember). In Linux I run version 20.4.2 of mprime, glibc-2.1.2-11 and
libc-5.3.12-31. I also have the primenet.ini file located in the
directory where mprime is installed, without the line [PrimeNet Proxy],
but I can see this isn't being used as ProxyMask=1 isn't being set, and
my password isn't encoded.
In the ips faq, the link at "you will need to download v20" in the
answer regarding this problem points to
"ftp://mersenne.org/gimps/sprime-v19.1.tar.gz" I tried downloading
sprime v20 (as this link suggested to me), but it also reports the
illegal line in primenet.ini, and error 2250. Havn't tried removing it
the line, as I'm pretty sure prime95 then stops working.
Anyone has an idea of how I should get this running in Linux?
And in the end, I'm joining the choir of "Please try to avoid html
messages on the mersenne-list", they are quite hard to decipher when
reading the digest which they also double the length of.
Hoping for a solution, or an explanation of what I've missed.
Dennis J�rgensen
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------------------------------
Date: Sat, 01 Jul 2000 16:30:15 -0700
From: Eric Hahn <[EMAIL PROTECTED]>
Subject: Re: Mersenne: Exponents Already Factored To 64 Bits
Stefan Struiker wrote:
>I noticed several factoring assignments, in the M13.4 mill range,
>where factoring was taken to only 64 bits, but not to 65, as would
>be done on a "fresh" candidate. Are these die-hards from the early
>daze when machines were wicked slower? Or is there another
>explanation?
Could be that they're using v18... v19 changed the factoring
depth limits. Previously, Prime95 would factor to 64-bits up
to 20.4 million range.
Eric
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------------------------------
Date: Sun, 02 Jul 2000 00:39:13 +0100
From: gordon spence <[EMAIL PROTECTED]>
Subject: Mersenne: Re: Mersenne Digest V1 #753
>
>
>I'd say 42 degrees is a little hot. I think I've heard numbers saying that
>50 is critical, and at 60, your CPU simply won't work anymore. My own
>usually runs at 28 or 29, even though the fan isn't especially good. The
>extreme overclockers get it down to -40 or even -50 :-)
I run an ABIT BP-6 with dual Celeron 433's running at 507, both have Golden
Orb's fitted. Temperature varies from 39-45 for the cpus and from 45-51 for
the case. CPU temperature is measured via a probe touching the underside of
the chip. As for getting a chip down to -40 or even -50, you can get a chip
*too* cold you know, then it also stops working properly......
regards
G
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------------------------------
Date: Mon, 3 Jul 2000 01:40:42 +0200
From: "Steinar H. Gunderson" <[EMAIL PROTECTED]>
Subject: Mersenne: Re: Mersenne Digest V1 #753
On Sun, Jul 02, 2000 at 12:39:13AM +0100, gordon spence wrote:
>I run an ABIT BP-6 with dual Celeron 433's running at 507, both have Golden
>Orb's fitted. Temperature varies from 39-45 for the cpus and from 45-51 for
>the case. CPU temperature is measured via a probe touching the underside of
>the chip. As for getting a chip down to -40 or even -50, you can get a chip
>*too* cold you know, then it also stops working properly......
Doubt it -- I just saw a story where some guys cooled their systems down to
- -190!! They used liquid nitrogen, and submerged their entire motherboard in
some kind of 3M fluid...
/* Steinar */
- --
Homepage: http://members.xoom.com/sneeze/
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------------------------------
Date: Sun, 2 Jul 2000 23:22:04 -0500
From: "chris" <[EMAIL PROTECTED]>
Subject: Re: Mersenne: Re: Mersenne Digest V1 #753
I have to agree... You can never have your case or chip -too- cold ... I've
seen that same article too.
- ----- Original Message -----
From: "Steinar H. Gunderson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, July 02, 2000 6:40 PM
Subject: Mersenne: Re: Mersenne Digest V1 #753
> On Sun, Jul 02, 2000 at 12:39:13AM +0100, gordon spence wrote:
> >I run an ABIT BP-6 with dual Celeron 433's running at 507, both have
Golden
> >Orb's fitted. Temperature varies from 39-45 for the cpus and from 45-51
for
> >the case. CPU temperature is measured via a probe touching the underside
of
> >the chip. As for getting a chip down to -40 or even -50, you can get a
chip
> >*too* cold you know, then it also stops working properly......
>
> Doubt it -- I just saw a story where some guys cooled their systems down
to
> -190!! They used liquid nitrogen, and submerged their entire motherboard
in
> some kind of 3M fluid...
>
> /* Steinar */
> --
> Homepage: http://members.xoom.com/sneeze/
> _________________________________________________________________
> Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm
> Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
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------------------------------
Date: Sun, 2 Jul 2000 23:51:01 -0700
From: "John R Pierce" <[EMAIL PROTECTED]>
Subject: Re: Mersenne: Re: Mersenne Digest V1 #753
> I have to agree... You can never have your case or chip -too- cold ...
I've
> seen that same article too.
sure you can. chilling the CPU below the point of condensation will cause
corrosion. Chilling it further below freezing will turn the whole thing
into a ball of ice.
The chip maker specifies a maximum AND minimum operating temperature within
which they guarantee the chips timing specs. stray too far from these
limits in either direction can/will cause problems.
- -jrp
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------------------------------
Date: Mon, 3 Jul 2000 05:36:34 -0400 (EDT)
From: Lucas Wiman <[EMAIL PROTECTED]>
Subject: Re: Mersenne: Re: Mersenne Digest V1 #753
> > I have to agree... You can never have your case or chip -too- cold ...
> I've
> > seen that same article too.
>
> sure you can. chilling the CPU below the point of condensation will cause
> corrosion. Chilling it further below freezing will turn the whole thing
> into a ball of ice.
Hmm. This depends what atmosphere you have it in. You could have it
submerged in liquid nitrogen or helium and then condensation wouldnt be
a problem. As to the running of the chip at low temps, my guess would
be that at microkelvins, the transistors would stop switching. Eventually
nothing could occurr at all.
> The chip maker specifies a maximum AND minimum operating temperature within
> which they guarantee the chips timing specs. stray too far from these
> limits in either direction can/will cause problems.
I think people who chill their chips in liquid nitrogen aren't worried about
what the chip manufacturors said the chip can do since what their doing
isn't covered by the chip manufacturor in any way (=non prescribed usage).
You technically aren't supposed to overclock at all, but many people do with
no problems.
- -Lucas Wiman
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------------------------------
Date: Mon, 3 Jul 2000 12:35:33 +0200
From: Martijn <[EMAIL PROTECTED]>
Subject: Mersenne: Re: Mersenne Digest V1 #753
Hi
You will get changes in conductivity at low temperatures
(definetely in the liquid helium range), this will ruin
your calculations. Furthermore some materials of which
your chip is build could start to phase change at low
temperatures. Ever seen what happens to standard
plastics put into liquid nitrogen? Due to the
surroundings my motherboard dual BP6 is seldomly
running under 60 C. So far no problems.
Kind Regards, Martijn
Quoting Lucas Wiman <[EMAIL PROTECTED]>:
> > > I have to agree... You can never have your case or
chip -too- cold ...
> > I've
> > > seen that same article too.
> >
> > sure you can. chilling the CPU below the point of
condensation will
> cause
> > corrosion. Chilling it further below freezing will
turn the whole thing
> > into a ball of ice.
>
> Hmm. This depends what atmosphere you have it in.
You could have it
> submerged in liquid nitrogen or helium and then
condensation wouldnt be
> a problem. As to the running of the chip at low
temps, my guess would
> be that at microkelvins, the transistors would stop
switching. Eventually
> nothing could occurr at all.
>
> > The chip maker specifies a maximum AND minimum
operating temperature
> within
> > which they guarantee the chips timing specs. stray
too far from these
> > limits in either direction can/will cause problems.
>
> I think people who chill their chips in liquid
nitrogen aren't worried
> about
> what the chip manufacturors said the chip can do since
what their doing
> isn't covered by the chip manufacturor in any way
(=non prescribed usage).
> You technically aren't supposed to overclock at all,
but many people do
> with
> no problems.
>
> -Lucas Wiman
>
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------------------------------
Date: Mon, 3 Jul 2000 18:37:21 -0000
From: "Brian J. Beesley" <[EMAIL PROTECTED]>
Subject: Re: Mersenne: Re: Mersenne Digest V1 #753
On 2 Jul 00, at 23:51, John R Pierce wrote:
> chilling the CPU below the point of condensation will cause
> corrosion.
Nah! Lowering the temperature reduces the rate of chemical and
physical reactions which constitute corrosion.
Over-rapid temperature changes can cause cracking due to thermal
stress. Also, metals become very brittle at low temperatures and may
be subject to fatigue cracking if mechanical vibration is not
controlled adequately. These are _real_ problems but are relatively
easily controlled.
> Chilling it further below freezing will turn the whole thing
> into a ball of ice.
Not if you keep it dry. Immersion in a nonconductive fluid (freon or
liquid nitrogen, depending on the required temperature) should fix
that, and provide a means for waste heat to be removed from the
operating components. Disconnecting the CPU fan & relying on the heat
sink alone would seem to be indicated.
> The chip maker specifies a maximum AND minimum operating temperature
> within which they guarantee the chips timing specs. stray too far from
> these limits in either direction can/will cause problems.
They usually specify 5C / 90% RH in order to make sure that there is
no condensation buildup. Without a controlled environment it's
difficult to prevent condensation with temperatures below 0C.
Actually the physics work in favour of cooler temperatures.
Resistivity falls and the circuits can switch faster with the same,
or even a lower, power consumption. This effect continues until
unwanted superconductivity sets in at a few degrees above 0K. (Say
somewhere below -250C, even without specially selected materials.)
The downside is that the reduced values of resistors in delay
circuits results in smaller decay time constants. Therefore, if you
run a chip _very_ cold you _may_ find that you have to _reduce_ the
core voltage slightly, or actually _increase_ the clock rate, in
order to get reliable operation.
The worst effect of seriously cooling a whole motherboard is likely
to be that the CMOS battery will not be happy (to say the least!).
Providing an external 3V power source should fix that problem. (Even
the same 3V battery mounted "warm" & connected via long leads will
do).
I would venture to suggest that the size, mechanical noise and power
consumption of a suitable nitrogen liquifying plant are the reason
why such techniques are not widespread.
Radio astronomers have been running electronics (RF detectors)
immersed in liquid _helium_ for decades. The practical problems are
solvable, at a price.
Regards
Brian Beesley
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------------------------------
Date: Tue, 4 Jul 2000 21:07:45 -0500
From: "Walt Welch" <[EMAIL PROTECTED]>
Subject: Mersenne: Primenet error 12002 ?
This is a multi-part message in MIME format.
- ------=_NextPart_000_0007_01BFE5FB.E6375080
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Hi All,
I installed Prime software under Win98SE and I'm getting Primenet Error =
12002 when it connects to Primenet to get work. I removed and =
reinstalled Prime software with the same result. Installs appeared to =
work correctly with no errors. I checked the suggested FAQ but this =
error code is not described. All other software on the computer is =
working fine. Does anybody have any ideas ?
TIA, Walt Welch
- ------=_NextPart_000_0007_01BFE5FB.E6375080
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.3018.900" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>Hi All,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I installed Prime software under Win98SE and I'm =
getting=20
Primenet Error 12002 when it connects to Primenet to get work. I =
removed=20
and reinstalled Prime software with the same result. Installs =
appeared to=20
work correctly with no errors. I checked the suggested FAQ but =
this error=20
code is not described. All other software on the computer is =
working=20
fine. Does anybody have any ideas ?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>TIA, Walt Welch</FONT></DIV></BODY></HTML>
- ------=_NextPart_000_0007_01BFE5FB.E6375080--
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------------------------------
End of Mersenne Digest V1 #754
******************************
