Hi! On 29.06.2024 21:04, Daryl F wrote:
Hi All!
Based on the discussion on IRC and my own research I finally came up with a possible answer to memory depletion while compiling qt6-webengine. I added this to the Pkgfile:
export NINJAFLAGS="-j $(( $(awk '/^MemAvailable:/ {print $2}' /proc/meminfo) / 3000000))"
It determines the number of threads to use based on qt6-webengine using about 3GB per thread. It uses the memory available value rather than total memory to take into account memory used for desktop, etc.
While something else I was trying created the problem in the first place for me, your proposed solution works fine for me! I'll add that to both qt5-webengine and qt6-webengine with the next push.
This solution might work for machines with widely varied resources but it will cause problems on very small machines. It can cause -j 0 in that case which will be bad since -j 0 means infinity. Probably not a good idea but I suspect a machine that small will not be used to build qt6-webengine anyway. Who has that that much time to wait?
I will probably just put a link to this mailing list thread into a README along the respective ports and I do agree, qt*-webengine is not for those in a hurry - but who am I kidding - a source based distro is probably not the right thing for that anyway.
I've read several complaints about ninja using nproc+2 for the default but the developers refuse to deal with it. I guess somewhere this an unwritten rule that REAL people have at least 4GB per thread. But I respect that, they probably have more than enough to do just to keep up with Qt without trying to get it to compile on every possible machine configuration.
I mean, under the hood, it's run by chromium, which is a killer to build and I guess a lot that's going on with qtwebengine builds stems from there, so one way to help improve the experience is to create tickets upstream and help to get them resolved.
-Daryl
Thanks for sharing Daryl and sorry for the long delay for this answer! Best regards, Tim
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