Mersenne Digest Saturday, January 27 2001 Volume 01 : Number 811
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Date: Mon, 22 Jan 2001 14:53:44 -0500 (EST)
From: Chip Lynch [EMAIL PROTECTED]
Subject: Re: Mersenne: GIMPS slowdown due to California power problems?
Well, I know it cost me a solid couple of days processing time for GIMPS.
My apartment was apparently blacked out briefly while I was at work, and
I've been turning my computers off in the evening to conserve, when
normally they'd be on.
The blackouts themselves have been brief, but they have happened. I'm in
San Francisco, although most of the reports I've heard have been from just
outside the bay area.
- ---Chip
On Mon, 22 Jan 2001 [EMAIL PROTECTED] wrote:
I live in Southern California, and no blackouts have come out, yet.
Everyone's been reporting that the main problem is in Northern California,
San Francisco especially. San Diego Area has a good amount of power plants.
Still, the people in California should, for the sake of fellow Californians,
turn off their computers at 6pm, and turn them on at night shortly after the
main usage time is over, 10pm. That is peak usage time, and we really don't
want to use electricity at that time. That's also when rolling blackouts are
issued. This summer, rolling blackouts could begin at the 6am - 8am period,
a smaller spike that occurs.
\\ ^ //
(o o)
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| Chip Lynch| Computer Guru|
| [EMAIL PROTECTED] ||
| | (202) 904-8570 (cell) |
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Date: Tue, 23 Jan 2001 02:58:24 +0100
From: "Waclaw W. Psiurski" [EMAIL PROTECTED]
Subject: Mersenne: Re: Mersenne Digest V1 #808: Re: GIMPS in the News
In Mersenne Digest Number 808 on Sunday, January 14 2001
Nathan Russell wrote on Mon, 08 Jan 2001
(...)
While I think that's a tad too much criticism directed at a
non-technical, local newspaper, and I know newspapers very rarely
print any more than a retraction of 3 or 4 lines in an inside corner
somewhere, I do have to dispute a few things said in that article:
"Nor has anybody developed an easy way to tell whether a number is
prime: Youve got to try dividing it by every possible factor,
which is a time-consuming pain in the patoot."
I think it's marginally possible to prove M127 in that fashion, but
not M521 or any higher Mersenne.
(...)
The thesis in above quotation from a local newspaper is not quite
true. A few monthes ago I found rather simple method (algorithm)
for checking if any natural is prime or not and it is not under
necessity of "to try dividing by every possible factor". It does
not need to know anything about any odd primes less then examined
natural n (exactly less then sqrt(n)). And I proved correctness of
this method. But it is time-consuming.
M521 is not so big - it is "only" in 521-bits arithmetic in
comparison to e.g. 8-megabits arithmetic.
- --
regards,
Waclaw W. Psiurski
[EMAIL PROTECTED]
[EMAIL PROTECTED]
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Date: Sat, 27 Jan 2001 14:17:44 +
From: Steve [EMAIL PROTECTED]
Subject: Mersenne: Results didn't go back to the server:
Recently my system failed to return a result back to the
server, on my account it shows as being overdue, but
I have this message in my results.txt:
M8200667 is not prime.
There was an error writing to the spool file and then it said
(in the log file) that it would try to reconnect in 60 minutes,
so I stopped mprime and started it again hoping that it would
send the results, but it just got more work to do (I have moved
house and didn't have net access for 3 weeks so ran out of work).
Any suggestions or help greatly received.
- --
Cheers
Steve email mailto:[EMAIL PROTECTED]
%HAV-A-NICEDAY Error not enough coffee 0 pps.
web http://www.zeropps.uklinux.net/
or http://start.at/zero-pps
2:11pm up 13 days, 36 min, 2 users, load average: 1.02, 1.01, 1.00
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End of Mersenne Digest V1 #811
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