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Search: Posts Made By: nordi
Forum: mersenne.ca 2021-02-26, 19:51
Replies: 536
Sticky: mersenne.ca
Views: 57,152
Posted By nordi
Nice! I also did not know about this page. To...

Nice! I also did not know about this page. To make it even better, could you filter out the exponents that are already fully factored?
Forum: Software 2021-01-25, 10:05
Replies: 108
Sticky: Prime95 v30.4
Views: 8,635
Posted By nordi
I got a crash with build 7 doing ECM work on...

I got a crash with build 7 doing ECM work on Linux:

show_signal_msg: 17 callbacks suppressed
mprime[18320]: segfault at 7fd563f78000 ip 00000000004511b2 sp 00007ff0cc98f860 error 6 in...
Forum: Software 2021-01-04, 19:45
Replies: 108
Sticky: Prime95 v30.4
Views: 8,635
Posted By nordi
I was also running into OOM problems when testing...

I was also running into OOM problems when testing earlier builds of 30.4. They were supposed to be fixed in the new version, though. Which operating system are you using?
Forum: Software 2021-01-04, 19:29
Replies: 108
Sticky: Prime95 v30.4
Views: 8,635
Posted By nordi
I tried out the PracSearch parameter and compared...

I tried out the PracSearch parameter and compared the perfomance of stage 1 in 30.4b5 against version 29.8, using my Ryzen 3950X (=Zen2 architecture):

M1277


PracSearch=1 52.7s
...
Forum: Data 2020-12-31, 16:01
Replies: 347
Views: 48,885
Posted By nordi
I finally got the benchmarks done. For ...

I finally got the benchmarks done. For

ECM2=N/A,1,2,1619,-1,10000000,100000000,1,

which uses FMA3 FFT length 96 on my Ryzen 3950X with 16 cores, I had these results:

16 workers:


...
Forum: Data 2020-12-31, 14:37
Replies: 347
Views: 48,885
Posted By nordi
While investigating the segfault issue, I found...

While investigating the segfault issue, I found that when doing

ECM2=N/A,1,2,11,-1,100000000,1000000000,1

the factor is found and then mprime goes to waiting mode. When I stop it with CTRL+C, I...
Forum: Data 2020-12-31, 14:20
Replies: 347
Views: 48,885
Posted By nordi
The new code seems to have a race condition...

The new code seems to have a race condition during startup that segfaults mprime roughly 1 out of 10 times on my system. I have


32 workers, configured to run...
Forum: Data 2020-12-27, 17:48
Replies: 347
Views: 48,885
Posted By nordi
Yes, 32 workers with "Memory=50000" in local.txt....

Yes, 32 workers with "Memory=50000" in local.txt. The MaxHighMemWorkers is not set in my config. The machine has 128GB of RAM.
That and the worktodo were sent via PM.
Forum: Data 2020-12-27, 14:24
Replies: 347
Views: 48,885
Posted By nordi
I tried again on Linux and mprime kept running...

I tried again on Linux and mprime kept running much longer than before, but was still stopped by the kernel's OOM killer. It used 121GB when configured to use just 50.


One thing I noticed is...
Forum: Hardware 2020-12-22, 21:35
Replies: 2
Views: 497
Posted By nordi
That was also my thought, especially considering...

That was also my thought, especially considering the 45W TDP and 8 memory channels! The same money for an AMD Epyc will get you half the cores at around twice the clockspeed (=same performance?), but...
Forum: Data 2020-12-22, 13:19
Replies: 347
Views: 48,885
Posted By nordi
Even with that setting, mprime consumes up to...

Even with that setting, mprime consumes up to ~100GB instead of 50GB, i.e. twice as much as it should.

I'm monitoring memory usage withwhile true; do grep "RssAnon" /proc/$(pidof mprime)/status;...
Forum: Data 2020-12-22, 12:26
Replies: 347
Views: 48,885
Posted By nordi
I freed up some memory and started a second test...

I freed up some memory and started a second test run, which aborted after a few minutes with the kernel saying

I'll set "Memory=50000" instead of 100000 and keep testing.
Forum: Data 2020-12-22, 11:34
Replies: 347
Views: 48,885
Posted By nordi
I got an out of memory error during my test run....

I got an out of memory error during my test run. Amongst many other things, the Linux kernel said Killed process 22440 (mprime) total-vm:112100576kB, anon-rss:109294088kB, file-rss:0kB, shmem-rss:4kB...
Forum: Data 2020-12-17, 22:54
Replies: 347
Views: 48,885
Posted By nordi
I'm interested in trying it out on Linux. Roughly...

I'm interested in trying it out on Linux. Roughly when will the testing begin, and when do you need the results?
Forum: Lone Mersenne Hunters 2020-12-17, 01:19
Replies: 1,797
Views: 187,800
Posted By nordi
UID: nordi/sweet16, M1489 has a factor:...

UID: nordi/sweet16, M1489 has a factor: 430768120877571983358263339450368443038134995818878229278591 (ECM curve 4082, B1=1000000000, B2=19071176724616)


60 digit factor, and what's left is a...
Forum: GMP-ECM 2020-12-14, 23:22
Replies: 3
Views: 807
Posted By nordi
For reference, the benchmark was performed on...

For reference, the benchmark was performed on Linux like this:

#!/bin/bash

function launch_ecm {
echo '(2^1489-1) / 71473 / 27201739919 / 51028917464688167 / 13822844053570368983 /...
Forum: GMP-ECM 2020-12-14, 23:18
Replies: 3
Views: 807
Posted By nordi
gmp-ecm step 1 performance with hyperthreading

While there's some good information about gmp-ecm step 1 performance on a single core (https://www.mersenneforum.org/showthread.php?t=23245), and many postings about running multiple gmp-ecm...
Forum: Lone Mersenne Hunters 2020-09-29, 21:36
Replies: 1,797
Views: 187,800
Posted By nordi
2020-09-29 00:19 M235871 has a factor:...

2020-09-29 00:19 M235871 has a factor: 1354753690999656789045256961
2020-09-29 02:32 M339331 has a factor: 167369080256159138493834809
2020-09-29 06:29 M289789 has a factor:...
Forum: Software 2020-07-13, 20:53
Replies: 612
Views: 116,858
Posted By nordi
My 3950X has been working on small FFTs on all 32...

My 3950X has been working on small FFTs on all 32 virtual cores for many weeks without any error or crash. I did not do any tweaking, it just worked out of the box.

With "small FFTs" I mean an FFT...
Forum: mersenne.ca 2019-12-10, 21:58
Replies: 536
Sticky: mersenne.ca
Views: 57,152
Posted By nordi
The "$?" gets replaced with the exit code of the...

The "$?" gets replaced with the exit code of the previous command. An exit code of "0" indicates that the program ran successfully.

Doing this as the very first command seems quite pointless....
Forum: Information & Answers 2019-11-14, 20:57
Replies: 6
Views: 1,239
Posted By nordi
You can add a line like this to your "prime.txt"...

You can add a line like this to your "prime.txt" configuration file:


PauseWhileRunning=firefox[2],chrome[1]


That will automatically pause 2 workers when Firefox is running, 1 if chrome is...
Forum: PrimeNet 2019-11-07, 08:05
Replies: 3
Views: 626
Posted By nordi
Mersenne.ca shows the exponent has 3891 curves...

Mersenne.ca shows the exponent has 3891 curves with B1=3,000,000 and B2=300,000,000, and not single curve with other parameters. So this bound is not completed. That's what's confusing the poster.
...
Forum: mersenne.ca 2019-08-13, 19:53
Replies: 536
Sticky: mersenne.ca
Views: 57,152
Posted By nordi
https://www.mersenne.ca/exponent/12732431...

https://www.mersenne.ca/exponent/12732431 produces this error:


PHP error encountered on line functions.local.inc.php:745, admin has been alerted:

Undefined offset: 0



Everything else on...
Forum: mersenne.ca 2019-08-08, 18:21
Replies: 536
Sticky: mersenne.ca
Views: 57,152
Posted By nordi
The following numbers are shown as "Remaining...

The following numbers are shown as "Remaining cofactor is PRP status unknown" on mersenne.ca, even though PRP checks were made in 2017/2018:
...
Forum: Hardware 2019-07-22, 19:45
Replies: 139
Views: 29,732
Posted By nordi
You can use mprime to do ECM on small exponents....

You can use mprime to do ECM on small exponents. Exponents up to ~3,000,000 should fit into the 512kB of L2 cache (stage 2 of ECM uses some RAM bandwidth, but accounts only for ~30% of execution...
Showing results 1 to 25 of 56

 
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