kksplace wrote:

Retvari Zoltan wrote:

"My tasks that are started as 'root' won't continue after I've started the BOINC manager as 'boinc', so don't be surprised if you have to manage this (aborting the task, or deleting the files from the slot as 'root')."

First, thank you for pursuing the great Linux/Boinc SWAN_SYNC mystery to completion -- I really appreciate it.

Next, on one of my hosts I did the 'run-BOINC-as-root' thing before the final answer. Based on your post quoted above, I might have some difficulty switching back to 'normal' Boinc manager. Do you have a recommendation on how to do it with minimal pain? (I also installed BoincTasks, so I do have a manager running.)

Thank you for any help on this.

You can do it with minimal pain by waiting for the tasks run out on the GPUGrid servers (or you can set the BOINC manager not to request new tasks from the GPUGrid project) and when the GPUGrid tasks run out on your host you can switch back to run BOINC daemon as 'boinc'.
You're welcome!

You can do it with minimal pain by waiting for the tasks run out on the GPUGrid servers (or you can set the BOINC manager not to request new tasks from the GPUGrid project) and when the GPUGrid tasks run out on your host you can switch back to run BOINC daemon as 'boinc'.

Thank you for the help.

I also discovered that somehow the Boinc Manager and Client became disconnected during the process. I found the following worked to get everything connected again:

https://askubuntu.com/questions/606666/boinc-wont-connect-to-the-client

Now everything back to 'normal' with SWAN_SYNC happily SPINning away.

UBUNTU 18.04 LTS
BOINC 7.9.3
NVIDIA driver 390.77
GPU 980 TI

How configure driver and BOINC, to reach 100% GPU load ?

You can't use the SWAN_SYNC environmental variable under Linux to dedicate a CPU thread for the GPUGrid app to increase GPU usage.
(It works only under Windows.)
BTW the GPUGrid app can't reach 100% GPU usage. The maximum is about 95% (under Windows XP with SWAN_SYNC on).

To my surprise I see 99-100% GPU usage under Linux since we've successfully applied SWAN_SYNC=1.
I will convert some of my GTX980Ti hosts to Linux to be able to compare the performance of Windows XP.
The Linux app using more recent CUDA (8.0), so perhaps it helps to increase its performance over the old Windows XP app (CUDA 6.5).

I think it's relatively accepted that the Linux scheduler is smarter than the Windows one. Probably the difference.

Don't be surprised if the power dissipation (i.e. the temperature and the fan speed) of your GPU(s) increase (about as much as its speed increases) after you apply the SWAN_SYNC=1.