mfaktc 0.20 decission
 

Hi,

please help me making another decission! :smile:
As you may allready know: mfaktc 0.20 will allow sieving done on GPU (for GPUs with CC 2.0 or newer). How should we handle this?[LIST=1][*]disabled by default, enable with commandline switch "[I]-gs[/I]"[*]disabled by default, controlled by variable "[I]SieveOnGPU[/I]" in mfaktc.ini[*]enabled by default, controlled by variable "[I]SieveOnGPU[/I]" in mfaktc.ini[*]other[/LIST]My vote is #3.
Option #1 is how George has implemented it when he has written the GPU sieve code for mfaktc, options #2/#3 are in sync with mfakt[B][COLOR="Red"]o[/COLOR][/B].

Oliver

[QUOTE=TheJudger;322618]Hi,

please help me makeing another decission! :smile:
As you may allready know: mfaktc 0.20 will allow sieving done on GPU (for GPUs with CC 2.0 or newer). How should we handle this?[LIST=1][*]disabled by default, enable with commandline switch "[I]-gs[/I]"[*]disabled by default, controlled by variable "[I]SieveOnGPU[/I]" in mfaktc.ini[*]enabled by default, controlled by variable "[I]SieveOnGPU[/I]" in mfaktc.ini[*]other[/LIST]My vote is #3.
Option #1 is how George has implemented it when he has written the GPU sieve code for mfaktc, options #2/#3 are in sync with mfakt[B][COLOR="Red"]o[/COLOR][/B].

Oliver[/QUOTE]
mfakto does not have a working GPU sieve yet, I just prepared the variable. I will adjust mfakto to mfaktc once I get these kernels to work. Anyway, I'd prefer #3 as well ...

[QUOTE=TheJudger;322618]Hi,

please help me makeing another decission! :smile:
As you may allready know: mfaktc 0.20 will allow sieving done on GPU (for GPUs with CC 2.0 or newer). How should we handle this?[LIST=1][*]disabled by default, enable with commandline switch "[I]-gs[/I]"[*]disabled by default, controlled by variable "[I]SieveOnGPU[/I]" in mfaktc.ini[*]enabled by default, controlled by variable "[I]SieveOnGPU[/I]" in mfaktc.ini[*]other[/LIST]My vote is #3.
Option #1 is how George has implemented it when he has written the GPU sieve code for mfaktc, options #2/#3 are in sync with mfakt[B][COLOR=Red]o[/COLOR][/B].

Oliver[/QUOTE]

#3 as well.

[QUOTE=TheJudger;322618]Hi,

please help me makeing another decission! :smile:

As you may allready know: mfaktc 0.20 will allow sieving done on GPU (for GPUs with CC 2.0 or newer). How should we handle this?[LIST=1][*]disabled by default, enable with commandline switch "[I]-gs[/I]"[*]disabled by default, controlled by variable "[I]SieveOnGPU[/I]" in mfaktc.ini[*]enabled by default, controlled by variable "[I]SieveOnGPU[/I]" in mfaktc.ini[*]other[/LIST]My vote is #3.
Option #1 is how George has implemented it when he has written the GPU sieve code for mfaktc, options #2/#3 are in sync with mfakt[B][COLOR=red]o[/COLOR][/B].

Oliver[/QUOTE]


#3 as well.

My vote is also on #3
I see a pattern emerging :razz:.

I like #3.

Chuck

#3, as with everyone else. Specifically, always use GPU sieving when possible (CC 2.0+, >2[sup]64[/sup]) unless explicitly disabled with "SieveOnGPU=0" in mfaktc.ini

[QUOTE=TheJudger;322618]
4. other
[/QUOTE]
Intelligent/Smart option -- Do a selftest and pick the one with highest thruput. Can be overridden by <whatever> mechanism.

[QUOTE=axn;322637]Intelligent/Smart option -- Do a selftest and pick the one with highest thruput. Can be overridden by <whatever> mechanism.[/QUOTE]
Too complicate, not necessarily useful... CPU status can change later (like from busy to free, from free to busy, from partial busy to full busy, etc). leading the "selftest" futile and having various influence on the OTHER tasks/workers using the CPU. The most people prefer to have the CPU free to do other things (P-1??). I'd go with number #3 too.

I agree on the #3 choice. I am eagerly looking forward to experimenting with the new version. I also look forward to having multiple CPU cores to use for other things without impinging on mfaktc performance. Those 'other things' would likely include P-1, but it would be cool to try multi-thread LL in P95. While I know that GPUs can generally do DC or TC faster, there are the times that only a P95 result will do.

[QUOTE=James Heinrich;322635]#3, as with everyone else. Specifically, always use GPU sieving when possible (CC 2.0+, >2[sup]64[/sup]) unless explicitly disabled with "SieveOnGPU=0" in mfaktc.ini[/QUOTE]
+1