rust: use PARALLEL_MAKE instead of BB_NUMBER_THREADS
* BB_NUMBER_THREADS is number of bitbake tasks running in
parallel, not parallelization inside individual tasks
* use oe.utils.parallel_make_argument to make sure it
works even when people add e.g. "-l 10" in PARALLEL_MAKE
* with the recent improvements for rust-native build time, I wanted
to rerun some build time tests from
https://github.com/shr-project/test-oe-build-time
here are the results on AMD Threadripper 3970x with 128GB ram:
BB is BB_NUMBER_THREADS
PM is PARALLEL_MAKE
TIME BB PM Description
20:50 * * zeus based build with 1.37 rust (BB/PM has no impact)
14:50 8 32,48,64 dunfell, 1.43 as in https://github.com/meta-rust/meta-rust/commit/d2ff87ca5545b8081b16ac8f53ed4295593208c6 (PM has no impact, because bootstrap uses BB)
9:50 8 32,48,64 dunfell, 1.43 with this patch applied, it doesn't get faster after some threashold of PM
13:32 8 64 dunfell, 1.43 with this patch applied and "rust.inc: cut build time in half" (https://github.com/meta-rust/meta-rust/commit/afcb58e5b9cbda7efb1c8a12c980cb2f583728bd) reverted
13:30 8 64 dunfell, 1.43 with "rust.inc: cut build time in half" (https://github.com/meta-rust/meta-rust/commit/afcb58e5b9cbda7efb1c8a12c980cb2f583728bd) as well as "rust.inc: run bootstrap.py in parallel" (https://github.com/meta-rust/meta-rust/commit/40a6bd8a8d943eff495c7fdeb0bf8452891f6f99) reverted to see if 1.43 builds faster without any meta-rust improvements compared to 1.37
94:47 1 64 dunfell, 1.43 as in https://github.com/meta-rust/meta-rust/commit/d2ff87ca5545b8081b16ac8f53ed4295593208c6 (either something went wrong or explicit "-j 1" disables some parallelism done by default already
13:40 * * zeus based build with 1.39 rust (BB/PM has no impact)
10:50 8 64 zeus based build with 1.39 rust as proposed in jansa/new-zeus-branch
80:51 8 1 zeus based build with 1.39 rust as proposed in jansa/new-zeus-branch with "-j 1" PARALLEL_MAKE
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Martin Jansa
647b976da2