On 2/10/20 5:53 am, Joel Sherrill wrote: > On Thu, Oct 1, 2020 at 2:39 PM Sebastian Huber > <sebastian.hu...@embedded-brains.de > <mailto:sebastian.hu...@embedded-brains.de>> > wrote: > > On 01/10/2020 20:09, Joel Sherrill wrote: > > > What was the rationale behind the choice of the default for the number > > of jobs for the waf build system? > I don't know. It is the default behaviour of waf. I noticed also > scalability problems but had no time to track them down. It could be > also a limitation of the Python multiprocessing capabilities. I am also > not a waf expert, I may have produced some bottlenecks. > > > I don't think you produced any bottlenecks. Here are a couple of fragments > from my build. I have attached the ini file so you can double check that it > does match. Please let me know if the ini matches the configure command > or not. If it doesn't, then I have a lot of bogus builds. :( > > ../rtems/configure --target=arm-rtems6 --enable-rtemsbsp=gumstix > --prefix=/home/joel/rtems-cron-6/tools/6/bsp-install --disable-networking > --enable-posix --disable-smp --disable-multiprocessing --enable-rtems-debug > --enable-profiling --enable-tests --enable-cxx --enable-maintainer-mode > + make -j24 > > real 1m53.064s > user 7m14.675s > sys 1m45.913s > ..... > > + ./waf -j 24 > > real 1m1.404s > user 0m9.601s > sys 0m1.547s > > Notice how the build time for waf is 50 seconds faster but that doesn't > match the user and system time. Perhaps the Python jobs model doesn't > keep them as children the same way so time doesn't get to count them. > > I honestly can't explain that. >
Which host OS? I am running a waf build of 5 BSPs with tests on FreeBSD 12.1 and I ran `systat -vmstat 1` at the same time and it shows idle is around 0%, 25% is in sys and 75% is in user. The machine has with 8 cores. The powerpc/mvme5500 took 58 seconds. Python is 3.7.6. Chris _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
