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Search: Posts Made By: ewmayer
Forum: Mlucas 2021-01-24, 19:55
Replies: 84
Views: 18,464
Posted By ewmayer
Thanks for the list, T - while few or no users...

Thanks for the list, T - while few or no users will be interested in those options, the issues need to get addressed on the way to the 19.1 release.

Edit:

OK, worked through the issues you...
Forum: Mlucas 2021-01-22, 20:45
Replies: 84
Views: 18,464
Posted By ewmayer
@tdulcet - yes, off-by-one indexing error is...

@tdulcet - yes, off-by-one indexing error is precisely what it is - good catch. At line 3595 of the v19.1 Mlucas.c I posted above, that "radset = i" needs to be changed to "radset = i-1" to undo the...
Forum: Mlucas 2021-01-20, 20:21
Replies: 84
Views: 18,464
Posted By ewmayer
Hi, Joniano - Yep, that's a weird one -...

Hi, Joniano -


Yep, that's a weird one - the timings in the "clocks = ... [msec/iter]" part of each 10Kiter checkpoint-status line look perfectly reasonably for a Pi4, around 15 minutes per...
Forum: Mlucas 2021-01-20, 19:56
Replies: 84
Views: 18,464
Posted By ewmayer
For SIMD builds the runtime is dominated by the...

For SIMD builds the runtime is dominated by the asm-macro instructions, so there might in fact be little or no difference. But in any case, with the patched mi64.c file I posted earlier in this...
Forum: Mlucas 2021-01-19, 20:19
Replies: 84
Views: 18,464
Posted By ewmayer
@tdulcet: Glad to be of service to someone else...

@tdulcet: Glad to be of service to someone else who wants be of service, or something. :)

o Re. KNL, yes I have a barebones one sitting next to me and running a big 64M-FFT primality test, 1...
Forum: Mlucas 2021-01-18, 20:49
Replies: 84
Views: 18,464
Posted By ewmayer
@tdulcet - How about I add support in v19.1 for...

@tdulcet - How about I add support in v19.1 for the -radset flag to take either an index into the big table, or an actual set of comma-separated FFT radices? Shouldn't be difficult - if the expected...
Forum: Mlucas 2021-01-16, 22:23
Replies: 84
Views: 18,464
Posted By ewmayer
Addendum: OK, I think the roadmap needs to look...

Addendum: OK, I think the roadmap needs to look something like this - abbreviation-wise, 'c' refers to physical cores, 't' to threadcount:

1. Based on the user's HW topology, identify a set of...
Forum: Mlucas 2021-01-16, 21:06
Replies: 84
Views: 18,464
Posted By ewmayer
@tdulcet: Extremely busy this past month working...

@tdulcet: Extremely busy this past month working on a high-priority 'intermediate' v19.1 release (this will restore Clang/llvm buildability on Arm, problem was first IDed on the new Apple M1 CPU but...
Forum: Mlucas 2021-01-14, 00:09
Replies: 84
Views: 18,464
Posted By ewmayer
-DUSE_THREADS is needed to enable multithreaded...

-DUSE_THREADS is needed to enable multithreaded build mode; without it you get a single-threaded build, which would only be useful if all you ever wanted to do is run one such 1-thread job per core....
Forum: Mlucas 2021-01-12, 21:02
Replies: 84
Views: 18,464
Posted By ewmayer
@pvn: The self-tests are intended to do two...

@pvn:

The self-tests are intended to do two things:

[1] Check correctness of the compiled code;

[2] Find the best-performing combination of radices for each FFT length on the user's...
Forum: Hardware 2020-12-30, 06:22
Replies: 156
Views: 23,016
Posted By ewmayer
Interesting, but ugh - that kind of...

Interesting, but ugh - that kind of nonportability is only worth it if it offers huge performance benefits for one's application.

Brief update re. Mlucas-on-M1: Laurent Desnogues has a...
Forum: Hardware 2020-12-23, 20:03
Replies: 156
Views: 23,016
Posted By ewmayer
You'll need to be specific as to what you man by...

You'll need to be specific as to what you man by "toy". If you mean Mlucas, it's had Arm64 128-bit SIMD assembly support since 2017. I no longer run it my little Odroid because that is too slow, only...
Forum: GpuOwl 2020-12-23, 19:49
Replies: 2,686
Views: 202,461
Posted By ewmayer
MattL, how many watts-at-wall (above system...

MattL, how many watts-at-wall (above system baseline) is the system pulling with the R7 Pro running?
Forum: Math 2020-12-15, 23:30
Replies: 16
Views: 626
Posted By ewmayer
@OP: Suggest you try a tiny M(p) example: n =...

@OP: Suggest you try a tiny M(p) example: n = M(11) = 2^11-1 = 23*89. The 2 prime factors have p-1 decompositions:

p = 23: p-1 = 2*11
q = 89: q-1 = 2^3*11

So taking E = 2*11 in p-1 stage 1...
Forum: Mlucas 2020-12-11, 21:41
Replies: 84
Views: 18,464
Posted By ewmayer
@pvn: Sorry for belated reply - that warning...

@pvn: Sorry for belated reply - that warning message is more common for larger threadcounts, it's basically telling you that part of the FFT code needs the leading (leftmost in the "Using complex FFT...
Forum: Hardware 2020-12-02, 20:33
Replies: 149
Views: 12,026
Posted By ewmayer
Just did a reboot and had a look at the CPU...

Just did a reboot and had a look at the CPU Configuration menu in the BIOs:

o CPU freq = 1.4GHz and not BIOS-adjustable (nor the min.max ratios), L1 = 4352KB (4.25MB), L2 = 34816KB (34MB),

o...
Forum: Hardware 2020-12-02, 03:38
Replies: 149
Views: 12,026
Posted By ewmayer
Yes, I took 'onboard' to mean in the CPU package...

Yes, I took 'onboard' to mean in the CPU package proper, because for it to be used to imply 'on the (mother)board' would be inane - as opposed to 'onshore'? - but apparently the mobo manual's usage...
Forum: Hardware 2020-12-01, 22:29
Replies: 149
Views: 12,026
Posted By ewmayer
From the mobo manual, I've bolded the relevant...

From the mobo manual, I've bolded the relevant snip:

"Memory Frequency
Use this feature to set the maximum memory frequency for onboard memory modules. The options are Auto, 1600, 1867, 2133, and...
Forum: Hardware 2020-12-01, 20:32
Replies: 21
Views: 1,871
Posted By ewmayer
I misspoke re. number-of-GPRs-available above ......

I misspoke re. number-of-GPRs-available above ... there are in fact 32, my Mlucas macros only ever use ones from the bottom 16, x0-x15. Laurent sent me a link to the Apple Developer page Writing...
Forum: Hardware 2020-12-01, 20:20
Replies: 149
Views: 12,026
Posted By ewmayer
First performance-tweak I tried was fiddling with...

First performance-tweak I tried was fiddling with the onboard-memory frequency. The mobo User Manual uses a quite stupid scheme for indicating submenu levels, right arrows of slightly differing sizes...
Forum: Hardware 2020-11-30, 22:11
Replies: 149
Views: 12,026
Posted By ewmayer
I found some useful perforated-metal-sheet...

I found some useful perforated-metal-sheet product listings here (https://www.amazon.com/Perforated-Metal-Sheets/s?k=Perforated+Metal+Sheets), but those are building-supply-oriented, few fine-mesh...
Forum: Hardware 2020-11-30, 20:00
Replies: 149
Views: 12,026
Posted By ewmayer
Yeah, that was a rather shoddy job w.r.to PSU...

Yeah, that was a rather shoddy job w.r.to PSU securement. Does your system also have the power plug which likes to disconnect at the slightest jiggling of the case?


It will support both - as I...
Forum: Hardware 2020-11-29, 23:22
Replies: 149
Views: 12,026
Posted By ewmayer
Spoke too soon - I neglected to mention that...

Spoke too soon - I neglected to mention that temperature was with the case side panel on the CPU side of the mobo removed - I put the panel back on last night and the temp quickly rose by over 10C...
Forum: Hardware 2020-11-29, 23:20
Replies: 149
Views: 12,026
Posted By ewmayer
My old Haswell system has an old non-modular PSU...

My old Haswell system has an old non-modular PSU with just a single 8-pin PCIe ... I manage to host 2 Radeon VIIs in it by ganging together the 2 6-pin PCI connectors into another 8-pin, then using...
Forum: Hardware 2020-11-29, 21:00
Replies: 21
Views: 1,871
Posted By ewmayer
Laurent PMed me results of a clang/llvm Mlucas...

Laurent PMed me results of a clang/llvm Mlucas build attempt. Most of the source files compiled fine, but there is a subset which failed, all due to clang reporting "error: inline assembly requires...
Showing results 1 to 25 of 1000

 
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