hello all!
can't find where to set up max gpu usage
anyone can show me where to?

I do not believe there is a way to directly limit gpu utilization. That is, there is no equivalent to the "use at most x% of cpu time".

In my experience once a gpu application executes, it is going to consume as much cpu (up to a core) and gpu as it can, and will tend to ignore any cpu constaints put upon it from, e.g. app_config.xml.

Do you need to set a particular % to preserve gpu capacity for something else running?

Or do you need to set a particular % to prevent the gpu from overheating or drawing too much power?

I'm not sure I understand the use case here.

If its the latter question, Dave's underclocking recommendation should absolutely do the trick, and you may be able to undervolt at the same time.

Per the question in the chat room, while not possbile to restrict GPU usage for a running task it is possible to restrict gpu running times, just not through BOINC.

For those operating systems where the client includes the command line tools (i.e. not macOS), you can create a start and a stop script for the GPU.

In windows, for example, the stop script would look something like:
"\Program Files\BOINC\boinccmd.exe" --set_gpu_mode never

and the start script would look like:
"\Program Files\BOINC\boinccmd.exe" --set_gpu_mode always

Set them up in Task Scheduler (or cron for other than Windows), and you are good to go. You may need to specify the drive letter where Program Files is located in the beginning of the path, e.g. "C:\Program Files..."

Per the question in the chat room, while not possbile to restrict GPU usage for a running task it is possible to restrict gpu running times, just not through BOINC.

Per the question in the chat room, while not possbile to restrict GPU usage for a running task it is possible to restrict gpu running times, just not through BOINC.

Actually, that's not true. There's a "Daily Schedule" tab in the BOINC preferences dialog that lets you set the days or times of days when BOINC is allowed to run. Assuming it works (I've never used it), it's certainly possible to limit BOINC to crunching only at certain times of the day. This feature has been in BOINC since the beginning, I believe.

Per the question in the chat room, while not possbile to restrict GPU usage for a running task it is possible to restrict gpu running times, just not through BOINC.

Actually, that's not true. There's a "Daily Schedule" tab in the BOINC preferences dialog that lets you set the days or times of days when BOINC is allowed to run. Assuming it works (I've never used it), it's certainly possible to limit BOINC to crunching only at certain times of the day. This feature has been in BOINC since the beginning, I believe.

Yes, but if you only want to stop GPU tasks and leave CPU tasks running, I believe you have to resort to scripts.

From the log, is it attempting to fetch them, and just receives zero tasks?

Also, is that the machine that once had a 780ti in it (although that shouldn't make a difference)?

My 290x (Hawaii, older) and my rx480 (Ellesmere, newer) both grab AP tasks without an issue, so I am a bit at a loss as to why Tonga would be a problem. It looks like you have no issue with Genefer (assuming I am looking at the right machine).

I have not received any AP27 wu yet for my R9 380X. Still waiting.

should I make bat file like:
"c:\Program Files\BOINC\boinccmd.exe" --set_gpu_mode never 70
and there will be no more 70% gpu usage by boinc?

I just want to use it on my friends and relatives computers. So I dont want make them any harm. And lags. They agree with me to give some of their computer resourses to science.

I just want to use it on my friends and relatives computers. So I dont want make them any harm. And lags. They agree with me to give some of their computer resourses to science.

For running tasks on computers that aren't yours or aren't in your household remember that the increased load also means increased electrical draw. More electricity used means higher electric bills for whoever is crunching. If your friends/family are going to agree to this make sure they know that it will cost them money.

Many an IT administrator in the early days of distributed computing have tried putting clients on all PC's on their networks. Running on one PC is very likely to go unnoticed. But running on 500 PC's is going to make a noticeable difference to network traffic and electrical cost.

My best advice for this is to not enlist your friends and family's computers at all for this. It is simply a bad idea and won't end well.

As for some GPU apps causing screen lag; the best way to deal with that is to manually suspend GPU crunching when you are actively using the computer and then manually resume crunching when you are going to walk away. That's how I deal with it.
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+1.

I also strongly recommend that if you are going to run GPU tasks you should have the appropriate telemetry in place, so you can monitor temperatures, adjust fan profiles, adjust voltages, etc., to ensure temperatures stay at an appropriate level. Very generally speaking, the higher the temperature, the shorter the life. Also very generally speaking, the higher the temperature, the greater the power draw.

There are also performance consequences to higher temperatures, particularly on newer GPUs, as they will start to throttle at higher temperatures.

Proper care and feeding of GPUs can help ensure a long, productive, and efficient life for them.

Preventing hardware damage:

This one isn't so easy. Consumer GPUs were designed for gaming, not full out, 24/7 crunching. It's sort of like taking a typical car on a race track and running the car at 150 mph continuously, 24 hours a day, 365 days a years. It wasn't built for that.

When doing this computing, the hardware, especially the GPUs, are drawing more power, and producing more heat, than in normal usage, and they're being asked to do it continuously.

There's a good chance that crunching will shorten the lifespan of the GPU. Additionally, computers used for crunching should be regularly cleaned to remove the dust in order to keep their cooling working properly.

GPU crunching tends to take more of a toll than CPU crunching. You probably won't damage your friends' CPUs, but I can't positively say the same thing about GPUs. I wouldn't use their GPUs if you're concerned about damaging their hardware.

One further note: this all assumes you're using desktop computers. If they have laptops, I don't recommend running BOINC at all. Laptops are not at all designed to deal with the kind of heat that running 24/7 produces, and you need to take special care when crunching on a laptop if you want it to last. For example, special cooling trays exist to force air into laptop vents. If your friends have laptops, don't ask them to crunch for you.