I was experimenting quite a bit with this in: https://github.com/shr-project/test-oe-build-time/commits/results e.g.: https://github.com/shr-project/test-oe-build-time/commit/d5111f4472ac397c0f1197eb6366ac7d2e56453f https://github.com/shr-project/test-oe-build-time/commit/e97d8fe55fcf848416a8494a90da4ae6418b19fe
but be aware that reasonable BB_PRESSURE_MAX_ values are different for kirkstone and master, see: https://lists.openembedded.org/g/bitbake-devel/message/15499 which wasn't merged yet. And for my system and typical builds BB_PRESSURE_MAX_* isn't able to prevent OOMK, because pressure is still fine when bitbake is starting chromium.do_compile and nodejs.do_compile tasks at the same time and OOMK gets triggered later even when only these 2 tasks are running in parallel with other tasks not started thanks to BB_PRESSURE_MAX_*. So I'm setting a bit lower PARALLEL_MAKE for chromium instead as in: BB_PRESSURE_MAX_CPU = "200000" BB_NUMBER_THREADS = "8" BB_NUMBER_PARSE_THREADS = "64" PARALLEL_MAKE = "-j 70 -l 140" PARALLEL_MAKE:pn-qtwebengine = "-j 40" PARALLEL_MAKE:pn-webruntime = "-j 40" which works well for my system and my typical builds, YMMV for yours. Regards, On Wed, Nov 29, 2023 at 10:21 AM Robert P. J. Day <rpj...@crashcourse.ca> wrote: > > a colleague is using Wind River Linux and is getting occasional OOM > errors when taking advantage of maximum parallelism, so he took the > quick way out and dialed things back using BB_NUMBER_THREADS and > PARALLEL_MAKE. > > however, i am aware of the bitbake variables > BB_PRESSURE_MAX_{IO,CPU,MEMORY} and was wondering if there is a decent > writeup on how to use, perhaps, BB_PRESSURE_MAX_MEMORY, to dynamically > detect imminent OOM and adjust things. that is, how to calculate a > sane value for that as i haven't yet dug into the values under > /proc/pressure and how to interpret them? > > i've seen mentions of combining the above with the "memstat" > command, and other approaches. thoughts? > > rday > > p.s. is there a docs page that expands on this stuff? > > > >
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