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Search: Posts Made By: ewmayer
Forum: Mlucas 2022-01-26, 19:07
Replies: 23
Views: 756
Posted By ewmayer
The OP's case is different in that his...

The OP's case is different in that his /proc/cpuinfo shows core numbers 0-7, as expected. But yes, especially Intel sometimes uses utterly bizarre internal numbering - I've integrated the hwloc...
Forum: Hardware 2022-01-25, 21:55
Replies: 230
Views: 40,472
Posted By ewmayer
Heads-up: the several brands of 32GB DIMM4 ECC...

Heads-up: the several brands of 32GB DIMM4 ECC server RAM modules I listed in post #168 of this thread (https://www.mersenneforum.org/showpost.php?p=577391&postcount=168) are now all ~$100 each. (I...
Forum: Hardware 2022-01-25, 20:07
Replies: 230
Views: 40,472
Posted By ewmayer
Don't know about Ubuntu on KNL ... under CentOS...

Don't know about Ubuntu on KNL ... under CentOS you want to use the 'lshw' command (https://vitux.com/how-to-get-system-hardware-details-on-centos-8/). On my KNL, truncating a bunch of similar...
Forum: Mlucas 2022-01-24, 22:34
Replies: 23
Views: 756
Posted By ewmayer
I did a preliminary online search for 'core_ctl',...

I did a preliminary online search for 'core_ctl', found very little material. May be wrong, but perhaps this power-management mechanism is intended to be accessible by the OS only. Your timings...
Forum: Mlucas 2022-01-23, 18:41
Replies: 23
Views: 756
Posted By ewmayer
Thanks for digging into this - sounds like the OS...

Thanks for digging into this - sounds like the OS is dynamically adding and removing cores from the set available for user processes.

When you start a job with '-cpu 0:7' and it starts without the...
Forum: Lounge 2022-01-20, 20:53
Replies: 1,652
Views: 171,417
Posted By ewmayer
With chickenpox, in the days before there was an...

With chickenpox, in the days before there was an effective anti-varicella vaccine, deliberate exposure of young children was a not-unreasonable choice, given the greatly increased severity and risk...
Forum: PrimeNet 2022-01-11, 19:15
Replies: 9
Views: 581
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: 23
Views: 756
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: 23
Views: 756
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: 5,616
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: 330,745
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: 939
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: 939
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: 939
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: 9,207
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: 5,443
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: 939
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: 191
Views: 15,052
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: 1,510
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: 1,510
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: 230
Views: 40,472
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: 5,616
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: 1,255
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: 1,510
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: 538
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....
Showing results 1 to 25 of 1000

 
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