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Search: Posts Made By: ewmayer
Forum: Lounge 2021-12-02, 21:55
Replies: 187
Views: 13,988
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: 1,041
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: 1,041
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: 38,211
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: 49
Views: 4,072
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: 1,006
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: 1,041
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: 360
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: 360
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: 36,651
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: 1,041
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: 1,041
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: 38,211
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: 1,041
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,...
Forum: Mlucas 2021-10-27, 20:45
Replies: 14
Views: 1,006
Posted By ewmayer
Thanks - what does "grep passed test.log" give? ...

Thanks - what does "grep passed test.log" give?

Suggest you save that 1-core/1-thread cfg-file as mlucas.cfg.1c1t so subsequent self-tests don't overwrite it.

The /proc/cpuinfo file alas says...
Forum: Hardware 2021-10-25, 20:06
Replies: 28
Views: 4,795
Posted By ewmayer
Sounds like Mlucas users wanting to maximize...

Sounds like Mlucas users wanting to maximize total throughput will be best off running 3 instances, one 4-thread job per Perf-cluster and a 2-thread one on the Eff-cluster. On M1 we've found that the...
Forum: Mlucas 2021-10-22, 20:32
Replies: 14
Views: 1,006
Posted By ewmayer
Hi, Simon - sorry, late to the thread. Been busy...

Hi, Simon - sorry, late to the thread. Been busy with Mlucas v20.1 bugfix work, only had time for my already-subscribed threads this past week.

Yes, it's been a while since anyone built the latest...
Forum: Lounge 2021-10-22, 18:50
Replies: 407
Views: 63,453
Posted By ewmayer
Oh, dear, that sounds quite Syrious - this is why...

Oh, dear, that sounds quite Syrious - this is why one should never attach bombs in, or to, one's home.
Forum: Hardware 2021-10-05, 21:21
Replies: 22
Views: 4,658
Posted By ewmayer
GMP's Torbjörn Granlund weighs in on RISC-V, and...

GMP's Torbjörn Granlund weighs in on RISC-V, and does not mince words:
Forum: Lounge 2021-09-16, 21:28
Replies: 1,701
Views: 140,491
Posted By ewmayer
My own rule for my GPU crunchers is that only one...

My own rule for my GPU crunchers is that only one of A/C or Crunchers may run at a given time. I only ethically justify running the GPU farms (which has added ~$200/month to my PG&E bill) by way of...
Forum: Programming 2021-09-09, 05:27
Replies: 9
Views: 1,740
Posted By ewmayer
It'll be easier for the rest of us to tell if...

It'll be easier for the rest of us to tell if it's implemented correctly if you would provide a sample input, say a random number of the desired bitlength p you are working (or pair of such if you're...
Forum: Programming 2021-09-07, 20:50
Replies: 9
Views: 1,740
Posted By ewmayer
BTW, a useful identity for computing inverse...

BTW, a useful identity for computing inverse weights for mod-M(p) transform is as follows - for length-N transform, start with the weights as per the original Crandall/Fagin paper (I dislike their p...
Forum: Programming 2021-09-07, 00:38
Replies: 9
Views: 1,740
Posted By ewmayer
Assuming your inputs are properly normalized,...

Assuming your inputs are properly normalized, i.e. x,y < (2^p-1), you break each into 32/33-bit pieces according to the per-word bitlengths in your list. (Balanced-digit representation is easy to...
Forum: Mlucas 2021-09-05, 03:02
Replies: 7
Views: 1,289
Posted By ewmayer
Congrats, but note that due to a small typo, "77...

Congrats, but note that due to a small typo, "77 digits" means binary digits, a.k.a. bits. We can dream of finding a 77-decimal-digit monster, tho.

So only a 6-7% stage 2 speedup on Arm, vs the...
Forum: Mlucas 2021-09-02, 20:36
Replies: 9
Views: 1,207
Posted By ewmayer
v20.1 is out. I suggest users upgrade at their...

v20.1 is out. I suggest users upgrade at their earliest convenience to gain the benefit of various bugfixes, as well as a significantly faster p-1 stage 2.

Please also check your worktodo.ini...
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