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Forum: GPU Computing 2021-01-17, 16:42
Replies: 21
Views: 646
Posted By preda
I would recommend to get a 850W or at least 750W...

I would recommend to get a 850W or at least 750W PSU, Gold 80+, and modular or semi-modular. Maybe read some reviews of the model before buying. The reason is: you have some power headroom (to 850W),...
Forum: Hardware 2021-01-05, 10:12
Replies: 124
Views: 7,794
Posted By preda
The cache (L1/L2/L3) is used transparently for...

The cache (L1/L2/L3) is used transparently for the *global* memory operations. It is managed automatically by the cache control (probably a variant of LRU), not explicitly by the software. So yes,...
Forum: GpuOwl 2020-12-13, 04:31
Replies: 195
Views: 12,393
Posted By preda
I'm personally not using 6.x myself, thus I don't...

I'm personally not using 6.x myself, thus I don't have a lot of motivation to improve it. From my POV, 7.x is now better in a couple of ways than 6.x, and I prefer to focus my (limited) resources on...
Forum: GpuOwl 2020-12-06, 22:58
Replies: 2,686
Views: 202,640
Posted By preda
GpuOwl uses very very little PCIe bandwidth. I...

GpuOwl uses very very little PCIe bandwidth. I regularly run it over PCIe x1 Gen1 without significant slowdown.
Forum: Hardware 2020-12-06, 22:54
Replies: 12
Views: 804
Posted By preda
Hardware donation and possible meet-ups

I may have some extra hardware located in Sydney (Australia), I'm considering donating it based on GIMPS participation. Is somebody [else] from the forum living in Sydney?

Now that I think of it,...
Forum: GpuOwl 2020-12-01, 23:42
Replies: 2,686
Views: 202,640
Posted By preda
Nice, thank you! I hope others will find the...

Nice, thank you! I hope others will find the package useful.
Forum: GpuOwl 2020-11-24, 21:38
Replies: 195
Views: 12,393
Posted By preda
"has slowed down" -- relative to what? did you...

"has slowed down" -- relative to what? did you compare two versions, to see what is the difference between them? Let's call the two versions you compare "before" and "after", or "good" and "bad"....
Forum: GpuOwl 2020-11-23, 22:23
Replies: 195
Views: 12,393
Posted By preda
No that is not possible with the current...

No that is not possible with the current savefiles, they are most probably different between GpuOwl and mprime.

OTOH mprime may be offering the merged PRP+P1 at some point in the future.
Forum: GpuOwl 2020-11-23, 09:53
Replies: 195
Views: 12,393
Posted By preda
Interesting. I haven't tried FFT 6M myself yet...

Interesting. I haven't tried FFT 6M myself yet (I'm still on 5.5M), I probably should.
- time helps a bit with timing the kernels. Sometimes running with -time old/new and comparing may provide a...
Forum: GpuOwl 2020-11-23, 02:58
Replies: 195
Views: 12,393
Posted By preda
Is your GPU actually a 4GB RAM card?

Is your GPU actually a 4GB RAM card?
Forum: GpuOwl 2020-11-13, 22:57
Replies: 2,686
Views: 202,640
Posted By preda
Not ATM. Based on the information available, it...

Not ATM. Based on the information available, it is more efficient to run with a higher B2 than to use BS (for the same amount of compute in P2).
Forum: GpuOwl 2020-11-13, 20:10
Replies: 2,686
Views: 202,640
Posted By preda
It is simply misreporting from GpuOwl: when it...

It is simply misreporting from GpuOwl: when it finds a P-1 factor, the part that writes the result doesn't know anymore whether it was found in stage1 or in stage2. It could write the result with...
Forum: GpuOwl 2020-11-12, 21:54
Replies: 195
Views: 12,393
Posted By preda
I think ROCm 3.3 is good. Also any after 3.5...

I think ROCm 3.3 is good. Also any after 3.5 should work fine, but maybe slower than 3.3. You can try, now it's easier to install multiple versions of ROCm OpenCL in parallel (at the same time) and...
Forum: Math 2020-11-11, 00:06
Replies: 14
Views: 574
Posted By preda
In pari/gp: 1 / mathilbert(n)

In pari/gp:

1 / mathilbert(n)
Forum: Math 2020-11-10, 23:33
Replies: 14
Views: 574
Posted By preda
Thanks! I thought that must be some well-known...

Thanks! I thought that must be some well-known matrix, but I didn't know its name :)
Forum: GpuOwl 2020-11-10, 22:48
Replies: 2,686
Views: 202,640
Posted By preda
Nice detective work! (yes, that sounds like a...

Nice detective work! (yes, that sounds like a reasonable explanation)
Forum: Math 2020-11-10, 22:44
Replies: 14
Views: 574
Posted By preda
The above matrix originated from attempting to do...

The above matrix originated from attempting to do a least-squares polynomial fit to a function evaluated over a (large) set of equidistant points. (the order of the matrix corresponds to the degree...
Forum: Math 2020-11-10, 22:21
Replies: 14
Views: 574
Posted By preda
Inverse of a particular matrix

I have a very special matrix, square n*n, where the lines 0..(n-1) are:
line(i)={1/(i+1), 1/(i+2), ... , 1/(i+n)}

for example, for n==2:

1 1/2
1/2 1/3

for n==3:
Forum: GpuOwl 2020-11-07, 07:04
Replies: 2
Views: 265
Posted By preda
One problem is that gpuowl.cl is very heavily...

One problem is that gpuowl.cl is very heavily optimized for the "-1" case -- the weighting/unweighting. A lot of tricks have been applied in that area. To change, a logical approach would be to...
Forum: GpuOwl 2020-11-04, 22:11
Replies: 195
Views: 12,393
Posted By preda
The version is this info that is printed by...

The version is this info that is printed by GpuOwl on every run, including "-h". It allows to track down exactly which changes are included and which are not.

GpuOwl VERSION v7.2-13-g266aed4
...
Forum: GpuOwl 2020-11-04, 22:03
Replies: 195
Views: 12,393
Posted By preda
So are you running with -unsafeMath -- why?...

So are you running with -unsafeMath -- why? please try without that. Don't use -unsafeMath unless you have a good reason for it.
Forum: GpuOwl 2020-11-04, 20:28
Replies: 195
Views: 12,393
Posted By preda
You did not include the version you're running. I...

You did not include the version you're running. I see in the opencl args that it uses -cl-unsafe-math-optimizations . This was dropped a few versions back (now you need to run with -unsafeMath to get...
Forum: GpuOwl 2020-11-03, 10:58
Replies: 195
Views: 12,393
Posted By preda
One more question: did this use to work (on an...

One more question: did this use to work (on an earlier 7.x version)? is the failure something recent, thus indicating that one of my recent changes broke something that was working before?
Forum: GpuOwl 2020-11-03, 10:34
Replies: 195
Views: 12,393
Posted By preda
Try increasing the FFT size, changing the FFT...

Try increasing the FFT size, changing the FFT variant, or otherwise fiddling with FFT precision settings. Let us know how it goes.

EDIT: I tried your exponent, with a similar setup (see below) --...
Forum: GpuOwl 2020-11-03, 07:53
Replies: 195
Views: 12,393
Posted By preda
Just comment out that line. I commited this...

Just comment out that line. I commited this change too, but you can also apply it locally (prepend "//").
Showing results 1 to 25 of 1000

 
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