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drummers-lowrise
1) Message boards : General discussion : No Tasks Available? (Message 136417)
Posted 4 days ago by rvoskoboynikov
Colab uses your default compute and primegrid preferences. In the default compute preferences, try setting the "maintain enough work for an additional X days" to zero.
2) Message boards : General discussion : All sub projects (Message 136386)
Posted 7 days ago by rvoskoboynikov
What is 27?


Probably the k=27 search on PRPNet. There's also 121, FPS (factorial) and PRS (primorial).

http://prpnet.primegrid.com
3) Message boards : Number crunching : Google Colab and its free GPUs (Message 136332)
Posted 9 days ago by rvoskoboynikov
I saw a T4 GPU one time on Colab. Only K80's and P100's every other time. Specs for the T4 put it similar to a 2070 Super in terms of CUDA cores. I did not benchmark it properly but I imagine it could easily do 250-300P in the allotted 12hrs.

One time only, and have not gotten one since.


In my limited anecdotal experience, it seems the T4 is slower than the P100 at GFN-18.
4) Message boards : Number crunching : LLR performance hit after BIOS update (Message 134339)
Posted 84 days ago by rvoskoboynikov
Thank you, I didn't know about this.
5) Message boards : Problems and Help : What is going on with these tasks/workunits? (Message 134275)
Posted 86 days ago by rvoskoboynikov
I honestly have no clue, these tasks are running on a google cloud linux platform. The only other possible relevant information I have is that I've been "merging" computers to keep the credit on the same "computer" - this also seems to result in tasks being marked abandoned. Another thing I noticed is that at least one of these tasks with arbitrary times was at one point marked abandoned, but suddenly became "completed" when I later refreshed the page.

Here's all the remaining tasks with the arbitrary time. The task that was at one point marked abandoned happened on or before October 24th:

https://www.primegrid.com/workunit.php?wuid=628500125
https://www.primegrid.com/workunit.php?wuid=628495987
https://www.primegrid.com/workunit.php?wuid=628429640
https://www.primegrid.com/workunit.php?wuid=628397299
https://www.primegrid.com/workunit.php?wuid=628393421
https://www.primegrid.com/workunit.php?wuid=628351221
https://www.primegrid.com/workunit.php?wuid=628288145
6) Message boards : Problems and Help : What is going on with these tasks/workunits? (Message 134273)
Posted 86 days ago by rvoskoboynikov
I've noticed that a few of my GFN-18 tasks are completed, but seem to have completely arbitrary run-times and CPU-times.

Example 1
Example 2
7) Message boards : Number crunching : LLR performance hit after BIOS update (Message 134272)
Posted 86 days ago by rvoskoboynikov
Just a thought -- the bios update may have reset your AVX offset value -- increasing the offset will slow down the CPU when it's faced with AVX workloads and will bring down your temps (and also slow down your processing a bit). The setting should be somewhere in your bios menu.

The BIOS is a proprietary Dell BIOS - as far as I can tell, there's no way to change any AVX settings.

After additional monitoring, I've come to the conclusion that the "performance hit" either never existed (placebo effect), was temporary, or still exists but is very minor.
8) Message boards : Number crunching : LLR performance hit after BIOS update (Message 134261)
Posted 86 days ago by rvoskoboynikov
Before the update, I was able to run at ~92% CPU time without excessive overheating. After the update, I have to run at ~88% CPU time without excessive overheating. I'm also simultaneously running GPU tasks while using all 4 cores to run LLR on a 4th gen i5 (this doesn't seem to significantly affect my LLR or GPU performance.)
9) Message boards : Number crunching : Suggestions for 2020 Challenges (Message 134260)
Posted 86 days ago by rvoskoboynikov
GFN-21: No GFN-21 prime discovered yet
PPS-Div: Newest LLR subproject
321-Sieve: Newest sieve subproject
SoB: Conjecture
ESP: Conjecture
PSP: Conjecture
SR5: Conjecture
TRP: Conjecture
CUL: Last Cullen prime discovered in 2009
10) Message boards : Fermat Divisor Search : Fermat Divisor Search (Message 134246)
Posted 87 days ago by rvoskoboynikov
Do you know roughly how long it will take for PPS-Div primes to make the top 100 and get official announcements?


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