> Hello, > I've been compiling Chromium with LTO and I noticed that WPA > stream_out forks and do parallel: > http://gcc.gnu.org/ml/gcc-patches/2013-11/msg02621.html. > > I am unable to fit in 16GB memory: ld uses about 8GB and lto1 about > 6GB. When WPA start to fork, memory consumption increases so that > lto1 is killed. I would appreciate an --param option to disable this > WPA fork. The number of forks is taken from build system (-flto=9) > which is fine for ltrans phase, because LD releases aforementioned > 8GB. > > What do you think about that?
I can take a look - our measurements suggested that the WPA memory will be later dominated by ltrans. Perhaps Chromium does something that makes WPA to explode that would be interesting to analyze. I did not managed to get through Chromium LTO build process recently (ninja builds are not my friends), can you send me the instructions? Honza > > Thanks, > Martin
