sgardell writes: > We are using a standard distro of gmake 4.1 on RH 6.4. > > We have a fairly well structured makefile system that leverages the ACE make > framework. A linear build (-j1) is about 3 hours. Running a parallel build > that builds leaf nodes (libraries) in parallel is about 1 hour. So far so > good. > > But when I try to build across makefiles in parallel then I see two > different things: > 1) If I turn on any sort of output sync it gets dramatically slower. > Sometimes slower than our -j1 time! > 2) Even with output sync turned completely off there is no meaningful > improvement over a parallel build of just the leaves. > > I am reasonably certain that I am actually seeing parallel build behavior > since I had to fix a handful of additional dependency issues to get it to > build. Also reasonably certain that the build is not doing different things > since the count of compiler invocations matches. Looking at 'top' during the > "highly parallelized" runs shows the system essentially idle. >
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