mersenneforum.org  

Go Back   mersenneforum.org > New To GIMPS? Start Here! > Information & Answers

Reply
 
Thread Tools
Old 2020-07-03, 03:26   #34
paulunderwood
 
paulunderwood's Avatar
 
Sep 2002
Database er0rr

3×5×233 Posts
Default

Did you drop the RAM frequency to 3000 MHz in BIOS? This should make your system more stable and should cease any errors in runs of Prime95.
paulunderwood is offline   Reply With Quote
Old 2020-07-03, 03:30   #35
petrw1
1976 Toyota Corona years forever!
 
petrw1's Avatar
 
"Wayne"
Nov 2006
Saskatchewan, Canada

2×23×97 Posts
Default

Quote:
Originally Posted by mersenneforum View Post
I was unable to start them yesterday ...how long would this take u reckon?
Days; not weeks.

You can calculate for yourself by looking at iterations per second; or ms per iteration.
It has to do the same number of iterations as the exponent you are testing.

You could shorten this time by either:
- Allocating more cores to each DC and doing less DC's under Test...Worker Windows
- Running DC on smaller exponents.
petrw1 is offline   Reply With Quote
Old 2020-07-03, 03:50   #36
bostonabcd
 
Jun 2020

22×5 Posts
Default

Paul
I did not have a chance to do so yet..Work and life got in the way and I have to send it out by tomorrow...So if you could share your thoughts regarding keeping the CPU+MBD I would appreciate it ...I have posted (2 or 3 posts above this)
Please oblige....

Quote:
Originally Posted by paulunderwood View Post
Did you drop the RAM frequency to 3000 MHz in BIOS? This should make your system more stable and should cease any errors in runs of Prime95.
bostonabcd is offline   Reply With Quote
Old 2020-07-03, 03:51   #37
bostonabcd
 
Jun 2020

22·5 Posts
Default

Wayne

I did not have a chance to do this yet...the return cut off is tommorow so I wont be able to complete this task before the deadline..>I should have started it last night but i was extremely tired and coultdnt process your suggestions..i will do so at a later point

..Work and life got in the way and I have to send it out by tomorrow...So if you could share your thoughts regarding keeping the CPU+MBD I would appreciate it ...I have posted (2 or 3 posts above this)
Please oblige....


Quote:
Originally Posted by petrw1 View Post
Days; not weeks.

You can calculate for yourself by looking at iterations per second; or ms per iteration.
It has to do the same number of iterations as the exponent you are testing.

You could shorten this time by either:
- Allocating more cores to each DC and doing less DC's under Test...Worker Windows
- Running DC on smaller exponents.
bostonabcd is offline   Reply With Quote
Old 2020-07-03, 04:40   #38
paulunderwood
 
paulunderwood's Avatar
 
Sep 2002
Database er0rr

3·5·233 Posts
Default

Quote:
Originally Posted by bostonabcd View Post
Paul
I did not have a chance to do so yet..Work and life got in the way and I have to send it out by tomorrow...So if you could share your thoughts regarding keeping the CPU+MBD I would appreciate it ...I have posted (2 or 3 posts above this)
Please oblige....
A few people have had to reduce RAM clock speeds on such systems as yours.

Keep the hardware.
paulunderwood is offline   Reply With Quote
Old 2020-07-03, 15:30   #39
petrw1
1976 Toyota Corona years forever!
 
petrw1's Avatar
 
"Wayne"
Nov 2006
Saskatchewan, Canada

446210 Posts
Default

Quote:
Originally Posted by paulunderwood View Post
A few people have had to reduce RAM clock speeds on such systems as yours.

Keep the hardware.
Agreed.
I don't think it's going to be difficult or costly to correct any instabilities....
petrw1 is offline   Reply With Quote
Old 2020-07-04, 06:17   #40
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

22·7·11·29 Posts
Default

@OP: your picture shows 8 workers, using 8 threads each. Does your CPU have 64 cores? (edit: I mean post #21, this tread still has two pages! sorry if it was asked or solved, I didn't read all the thread in depth, yet)

Last fiddled with by LaurV on 2020-07-04 at 06:23
LaurV is offline   Reply With Quote
Old 2020-07-13, 00:14   #41
bostonabcd
 
Jun 2020

22×5 Posts
Default

LaurV

This is the info i found...I dont remember why I chose 8 workers and 8 threads (nor do I think I chose those number for any intelligent reason in particular)..i must have seen something somewhere...
# of CPU Cores 8
# of Threads 16
Base Clock 3.6GHz
Max Boost Clock Up to 4.4GHz
Please let me know if you have any further suggestions. I am going to do one of those DC processes one of the users had suggested in one of the previous comments. I plan on performing these tests next week. I can factor in your thoughts into the test as well.

Pls advise.


Quote:
Originally Posted by LaurV View Post
@OP: your picture shows 8 workers, using 8 threads each. Does your CPU have 64 cores? (edit: I mean post #21, this tread still has two pages! sorry if it was asked or solved, I didn't read all the thread in depth, yet)
bostonabcd is offline   Reply With Quote
Old 2020-09-23, 10:11   #42
phillipsjk
 
Nov 2019

4116 Posts
Default

Prime 95 does not really benefit from having more threads than physical cores.


So 8 workers, each with 8 threads is a total of 64 threads: on only 8 physical cores.


Without knowing the cache hierarchy of your CPU, you may want 2 workers with 4 threads each (for example).


I happen to know that every 2 cores on my older machine shares a level 2 cache. I set up 3 workers using 2 treads each, with CPU affinity. I left 2 cores free for my own computer usage (was running into cache eviction issues, or something).


In my local.txt


[Worker #1]
Affinity=0-1

[Worker #2]
Affinity=2-3

[Worker #3]
Affinity=4-5

Last fiddled with by phillipsjk on 2020-09-23 at 10:12 Reason: typo
phillipsjk is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sci-Tech extrapolation into Sci-Fi. jwaltos Reading 0 2017-10-31 19:00
Are genius tech guys all rascally knave? jasong jasong 28 2013-07-11 21:37
tech patent idea: doubtful click processing jasong jasong 4 2012-07-20 13:21
virgina tech university shootings science_man_88 Soap Box 11 2011-12-14 07:41
2006 Millennium Tech. Prize. mfgoode Science & Technology 0 2006-06-17 16:44

All times are UTC. The time now is 20:47.

Wed Nov 25 20:47:07 UTC 2020 up 76 days, 17:58, 3 users, load averages: 1.06, 1.39, 1.50

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.