I wonder what I am doing wrong since my GPU 1080 Ti
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Message boards : Number crunching : I wonder what I am doing wrong since my GPU 1080 Ti

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Miklos M.
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Message 24794 - Posted: 8 Feb 2018, 23:27:34 UTC

I wonder what I am doing wrong since my GPU 1080 Ti takes almost an hour per wu? Also, I have two cards, but only one is running. Perhaps I should use less cpu's?

Thank you

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Message 24795 - Posted: 9 Feb 2018, 12:57:28 UTC - in response to Message 24794.

I wonder what I am doing wrong since my GPU 1080 Ti takes almost an hour per wu? Also, I have two cards, but only one is running. Perhaps I should use less cpu's?

Thank you


copy and paste these lines using NOTEPAD into the Nvidia_config file located at
C:\ProgramData\BOINC\projects\boinc.thesonntags.com_collatz

verbose=1
kernels_per_reduction=48
sleep=1
threads=9
lut_size=18
reduce_CPU=0
sieve_size=30
cache_sieve=1

Save the file using it's existing name and at the start of the next workunit your gpu will begin using 100% of itself and crunching a workunit almost twice as fast. In addition go into the Boinc Manager and under Option, computing preferences, computing tab set the very top line to 99%. That will free up one cpu core for the gpu to use so it can run as fast as it can and not be slowed down waiting to crunch. Yes you will lose that cpu core for a cpu workunit, but since your gpu is over 10% faster you will actually be gaining rac as you crunch the gpu workunits faster.

To use both gpu's you will need a cc_config.xml file with these lines in it:

<cc_config>
<options>
<use_all_gpus>1</use_all_gpus>
</options>
</cc_config>

That tells Boinc to use all the gpu's it finds, put it in the c:\program data\Boinc directory by using NOTEPAD in Windows to copy and create a new file called cc_config.xml do NOT let Windows add the '.txt' file extension on the end as Boinc won't then recognize the file. You will need to stop and then restart Boinc for this to work as it needs to see these lines when Boinc starts up. If Windows does add the '.txt' extension just rename the file to cc_config.xml after it's saved, saying yes to any messages about being the wrong format.

Miklos M.
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Message 24797 - Posted: 9 Feb 2018, 15:56:25 UTC - in response to Message 24795.

Thank you mikey.

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Message 24801 - Posted: 10 Feb 2018, 11:33:41 UTC - in response to Message 24797.

Thank you mikey.


No problem

Miklos M.
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Message 24804 - Posted: 11 Feb 2018, 1:11:22 UTC - in response to Message 24795.

Would these directions also apply to two 780ti cards, in order to speed them up? They both run, but I thought maybe a little slowly. They take about 2400-2600 seconds for one unit.

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Message 24807 - Posted: 11 Feb 2018, 14:17:49 UTC - in response to Message 24804.

Would these directions also apply to two 780ti cards, in order to speed them up? They both run, but I thought maybe a little slowly. They take about 2400-2600 seconds for one unit.


Yes but try these numbers instead:

Nvidia 980Ti
lut_size=18
kernels_per_reduction=64
sieve_size=30
verbose=1
threads=10
sleep=1
reduce_cpu=0

As you can see they are for the 980Ti, I don't have 780Ti numbers exactly so you will have to try them and then adjust them to fit your needs. You still want to be able to use the pc and not produce bad workunits, and still crunch as fast as you can.


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