The year's almost over, so it must be time for another PrimeGrid Winter Solstice Challenge. 🙂 Once again we're trying to light up (or at least heat up) the darkness with another GPU sieve challenge. This challenge also happens to use a sieve client I wrote, so I have a few more suggestions than usual. :sneaky: Also note the unusual times below!
What you need to participate:
What would help a whole lot:
What would help a little, but isn't absolutely necessary:
What won't help (but won't hurt either):
This challenge starts on December 18, at 17:11 UTC and runs until the Winter Solstice three days later. (Note the unusual start and end times!) Only WUs downloaded after the start of the challenge and completed before the end of the challenge (and before the end times) will be counted. Should you not be able to be in front of one or more computers at the start time, either set their queue level to zero (0) days or try one of the scheduled start methods from the strategy thread (for Linux or Windows). Network connection time options may also be useful - though they depend on your computer's clock being correct, so set the start time a few minutes late.
Welcome and good luck to all! :thumbsup:
What you need to participate:
- One or more fast x86 processors. (Even slow ones will do!)
- Windows, Linux, or MacOS 10.4+.
- BOINC, attached to PrimeGrid (http://www.primegrid.com/).
- Your PrimeGrid Preferences with only "Proth Prime Search (Sieve)" selected in the Projects section. (It's the one marked as this month's Challenge project.)
What would help a whole lot:
- An nVIDIA GPU, of the 8000 series or later (so it's CUDA capable). A mid-range GTX 460 does about 10 times as much work as a mid-range quad-core CPU! 😱
- An AMD GPU, of the 4000 series or later (so it's OpenCL capable), with the 10.10 or later Catalyst drivers, of the APP variety. A mid-range Radeon 5770 does 2-3 times as much work as a mid-range quad-core CPU.
- "Use ATI GPU" and "Use NVIDIA GPU" set to "yes" in your PrimeGrid preferences.
- Windows users should make sure they have msvcrt90.dll. You can get it by installing the .NET 3.5 runtime. (Not sure if this is still necessary, but it's listed just in case.)
- Users with multiple GPUs should add a cc_config.xml file.
What would help a little, but isn't absolutely necessary:
- A 64-bit OS on a 64-bit processor will run CPU work 30% faster than a 32-bit OS. It matters very little for GPU work. If you can't get a GPU working on a 64-bit OS, but it does work on a 32-bit OS, go back to the 32-bit OS.
- Overclocking a little. This project produces less heat than the LLR challenge from last month, and it's more tolerant of errors - except on GPUs, so watch out!
- An app_info.xml file may be useful, especially with a non-standard addition:
- <cmdline>-m64</cmdline> may improve performance a few percent on Fermi-based nVIDIA cards. Other values may improve performance a little on other cards -- try them and see!
- <count>0.5</count> would let two computations run at once on Fermi-based nVIDIA cards. This generally doesn't seem helpful, but you're welcome to try it anyway.
What won't help (but won't hurt either):
- A large amount of RAM.
- Any older video cards or Intel video cards - though you might want to use them for your display while newer cards crunch.
This challenge starts on December 18, at 17:11 UTC and runs until the Winter Solstice three days later. (Note the unusual start and end times!) Only WUs downloaded after the start of the challenge and completed before the end of the challenge (and before the end times) will be counted. Should you not be able to be in front of one or more computers at the start time, either set their queue level to zero (0) days or try one of the scheduled start methods from the strategy thread (for Linux or Windows). Network connection time options may also be useful - though they depend on your computer's clock being correct, so set the start time a few minutes late.
Welcome and good luck to all! :thumbsup:
