PrimeGrid's Number Theory Week Challenge (5 of 8 in the PrimeGrid Challenge Series)


[H]ard|DCer of the Year - 2014
Jan 29, 2006
The 5th Challenge of the 2017 Challenge series is a 5 day challenge to celebrate Number Theory Week 2017. The challenge is being offered on the 321 Prime Search (LLR) application.

To participate in the Challenge, please select only the 321 Prime Search (LLR) project in your PrimeGrid preferences section. The challenge will begin 3rd September 2017 18:00 UTC and end 8th September 2017 18:00 UTC.

You must log into your account at PrimeGrid to change your project preferences so that you are only crunching the correct sub project. In this case 321 Prime Search LLR.
Intel boxes tend to perform better. The HT probably needs turned off since these are LLR work units. Do your testing in advance.
Intel chips tend to out perform AMD chips
PrimeGrid work will stress hardware harder and so is more sensitive to overclocking. Therefore make sure you have tested their work units on your rigs before the challenge to make sure they are stable.
These challenges only count work units downloaded during and completed before end of the challenge. So, no bunkering.
If you decide to run a multi-threaded work unit instead of one per thread try:

<cmdline>-t X</cmdline>
<avg_ncpus>X</avg_ncpus>20m 40sec left to go

Just replace the X with the number of threads you want each work unit to use.
These tasks are really long based on what I'm seeing at the PrimeGrid site. The app_config modification certainly would be helpful to get tasks turned around quicker.

The "average" is 40 hours for 321 Prime Search. So if you have 4 cores, with HT, you'd replace X with 8. In this instance you'd drop your processing time down to around 8 to 10 hours. Higher chance you'd return a work unit in within the last day of the challenge.