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Forum: PrimeNet 2022-01-11, 19:15
Replies: 9
Views: 545
Posted By ewmayer
Thanks for the tip - I see two such among my...

Thanks for the tip - I see two such among my recent-results, one of which was submitted yesterday and the CERT is 35% done, but the second...
Forum: Mlucas 2022-01-11, 19:07
Replies: 14
Views: 435
Posted By ewmayer
Have you ever been able to run using '-cpu 0:7'...

Have you ever been able to run using '-cpu 0:7' without the invalid-argument warnings, or is 6 cores the maximum that has (sometimes) worked? It sounds like the OS is doing some kind of dynamic core...
Forum: Mlucas 2022-01-10, 21:36
Replies: 14
Views: 435
Posted By ewmayer
Echoed - some OSes do weird things with respect...

Echoed - some OSes do weird things with respect to physical and/or logical core numbering. An attempt to set a thread's affinity to a non-existent core (based on the OS' core numbering scheme, as...
Forum: Hardware 2022-01-03, 19:56
Replies: 59
Views: 5,502
Posted By ewmayer
More on the intel-mandated avx-512 neutering: ...

More on the intel-mandated avx-512 neutering:

https://www.igorslab.de/en/intel-deactivated-avx-512-on-alder-lake-but-fully-questionable-interpretation-of-efficiency-news-editorial/

Edit: Re....
Forum: GpuOwl 2021-12-26, 19:55
Replies: 2,751
Views: 328,871
Posted By ewmayer
Still, there's no good reason the run should just...

Still, there's no good reason the run should just abort, since the context - exponent close to an FFT-length breakover point - points to fatal ROE (not detected by gpuOwl except in this backdoor way)...
Forum: Mlucas 2021-12-25, 20:46
Replies: 11
Views: 877
Posted By ewmayer
Yes, I saw your first note re. your Indian...

Yes, I saw your first note re. your Indian phone's chipset - do you run it with the back cover off, or on? On the S7 the back cover is part of the cooling system, one of my S7s had a broken one, I...
Forum: Mlucas 2021-12-24, 20:23
Replies: 11
Views: 877
Posted By ewmayer
The S7s have a highly sophisticated internal...

The S7s have a highly sophisticated internal cooling system, but still get hot running an FPU-heavy 24/7 application like Mlucas. I needed external cooling to keep the from auto-throttling, as in the...
Forum: Mlucas 2021-12-22, 03:57
Replies: 11
Views: 877
Posted By ewmayer
Glad to hear it - what model phone is this, and...

Glad to hear it - what model phone is this, and how do your stage 2 per-iteration timings compare to the stage 1 ones?
Forum: Software 2021-12-15, 20:59
Replies: 24
Views: 9,157
Posted By ewmayer
You do realize the post you replied to is over 10...

You do realize the post you replied to is over 10 years old, yes? Probably better to PM Christenson, if said user is still around/active.
Forum: Hardware 2021-12-13, 21:25
Replies: 30
Views: 5,390
Posted By ewmayer
Prime95 is only optimized for the various flavors...

Prime95 is only optimized for the various flavors of the x86 instruction set - Apple Silicon is based on the Arm ISA. See here (http://www.mersenneforum.org/mayer/README.html) - note no GUI, it's...
Forum: Mlucas 2021-12-12, 22:26
Replies: 11
Views: 877
Posted By ewmayer
Android's memory-managment messes up Mlucas'...

Android's memory-managment messes up Mlucas' stage 2 available-memory computation ... you can override it by forcing a specific (maximum) number of stage 2 buffers to be used, via the -pm1_s2_nbuf...
Forum: Lounge 2021-12-02, 21:55
Replies: 188
Views: 14,905
Posted By ewmayer
Today's date (in digital-readout mm.dd.yyyy...

Today's date (in digital-readout mm.dd.yyyy format) is both a palindrome and an ambigram.
Forum: Mlucas 2021-12-02, 19:38
Replies: 14
Views: 1,444
Posted By ewmayer
Patch Alert:Due to a user report of bad behavior...

Patch Alert:Due to a user report of bad behavior of regular (non '-9') kill with his multithreaded run, signal handling has been changed to immediate-exit without savefile write. Suggest users...
Forum: Mlucas 2021-11-29, 03:18
Replies: 14
Views: 1,444
Posted By ewmayer
Patch Alert: Some recent code changes to clean up...

Patch Alert: Some recent code changes to clean up the messaging and file-writing left a few dangling fclose() calls in the two *_mod_square.c source files, potentially leading to a null-pointer...
Forum: Hardware 2021-11-27, 18:52
Replies: 224
Views: 39,952
Posted By ewmayer
Mike/Xyzzy fwded the following link to a...

Mike/Xyzzy fwded the following link to a used-gear-4-sale Reddit page, asked if the Xeon Phi gear there was a good deal, presumably w.r.to GIMPS crunching:
...
Forum: Hardware 2021-11-25, 02:55
Replies: 59
Views: 5,502
Posted By ewmayer
I continue to be pleasantly surprised by the...

I continue to be pleasantly surprised by the performance of the budget refurb KNL system ($500) I bought a year ago ... the 16GB onboard MCDRAM is probably pretty close in terms of total bandwidth to...
Forum: Mlucas 2021-11-23, 23:30
Replies: 14
Views: 1,228
Posted By ewmayer
Apologies for the delayed reply - been full-up...

Apologies for the delayed reply - been full-up busy with ongoing work on the latest Mlucas release.

Thanks for the data - my comments:

o Leading radix-32 appears to have been miscompiled -...
Forum: Mlucas 2021-11-23, 19:34
Replies: 14
Views: 1,444
Posted By ewmayer
Just uploaded an updated version of the v20.1.1...

Just uploaded an updated version of the v20.1.1 tarball with several not-critical-but-nice-to-have bugfixes, and 2 feature-adds:

1. Signal-handling has been restored;
2. More-flexible workfile...
Forum: Hardware 2021-11-22, 23:34
Replies: 8
Views: 521
Posted By ewmayer
Yes, it seems all versions of 1st-gen Phi have...

Yes, it seems all versions of 1st-gen Phi have the same "ICMI 512-bit" SIMD instruction set. However, the setup needed to build and run code is nontrivial - from the person who contacted me (a.k.a....
Forum: Hardware 2021-11-22, 19:49
Replies: 8
Views: 521
Posted By ewmayer
Any First-gen Xeon Phi System Owners?

I can recall several posts on mersenneforum.org in the past (mostly in the Xeon Phi? (https://mersenneforum.org/showthread.php?t=25767) thread) in which users contemplated buying a cheap used...
Forum: Hardware 2021-11-11, 22:53
Replies: 175
Views: 37,643
Posted By ewmayer
No - the Galaxy S7 models I used have a QualComm...

No - the Galaxy S7 models I used have a QualComm Snapdragon 820 (https://en.wikipedia.org/wiki/Snapdragon_820), which in my tests is around 2x faster than the A53 quadcore in my Odroid C2. The above...
Forum: Mlucas 2021-11-06, 19:58
Replies: 14
Views: 1,444
Posted By ewmayer
Patch Alert: There was [a] a PRP-postprocessing...

Patch Alert: There was [a] a PRP-postprocessing bug leading to a sanity-check assertion-exit, and [b] a p-1 premature-exit-at-end-of-stage-1 bug in the initial v20.1.1 release. (01 Nov, md5 =...
Forum: Mlucas 2021-11-03, 21:26
Replies: 14
Views: 1,444
Posted By ewmayer
Note to 20.1.1 users: there is a small messaging...

Note to 20.1.1 users: there is a small messaging bug in v20.1.1 where a missing mlucas.ini entry for one of the supported options triggers a "User set unsupported value = NaN ... ignoring" message....
Forum: Hardware 2021-11-02, 21:12
Replies: 224
Views: 39,952
Posted By ewmayer
I have some very interesting p-1 stage 2 timings...

I have some very interesting p-1 stage 2 timings to report, related to the issue of running big-memory-footprint tasks in a mix of the 16GB fast onboard MCDRAM and any regular dimm-based RAM the...
Forum: Mlucas 2021-11-02, 03:11
Replies: 14
Views: 1,444
Posted By ewmayer
Mlucas v20.1.1 (latest) available

This is a patch-release of v20.1, containing two modest feature-adds, several important bugfixes and lots of smaller-issue cleanup. Thanks to tdulcet and kriesel for much beating-on-the-code QA work,...
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