>From a recent thread I started on the CMake mailing list it turns out a limitation of CMake's 2-tier recursive use of make is that two targets which (directly or indirectly) depend on the same file will have good parallel build results only if there is a target dependency between the two targets to force one target to be completed before the next one is attempted. From the "make" perspective such additional target dependencies make no sense for parallel builds, and previously I didn't worry about such extra target dependencies because I didn't test parallel builds that require them.
Recently, I have been working on the parallel build issue. I have put in additional target dependencies that are required by the above rule (and also used an additional file dependency to serialize two custom commands which were using the same *.aux files in the documentation build). With these changes, I now have success for the -j 2 (two parallel jobs allowed) build of PLplot, its ctest suite, and its documentation. Here are the results. [EMAIL PROTECTED]> cmake \ -DCMAKE_INSTALL_PREFIX=/home/software/plplot_cvs/installcmake \ -DENABLE_ada=ON -DBUILD_TEST=ON -DBUILD_DOC=ON ../plplot_cmake >& cmake.out [EMAIL PROTECTED]> time make -j 2 >& make.out real 1m16.413s user 1m49.783s sys 0m13.413s Note the real time (which is impressively short for the case of essentially all components of PLplot being built) is roughly half the sum of the user+sys time because the build kept both processors on my system running most of the time. The latency is also impressively low. [EMAIL PROTECTED]> time make -j 2 >& make.out2 real 0m0.882s user 0m0.848s sys 0m0.772s Finally, there are no problems with ctest. [EMAIL PROTECTED]> time ctest Start processing tests Test project /home/software/plplot_cvs/HEAD/build_dir 1/ 12 Testing examples_c Passed 2/ 12 Testing examples_cxx Passed 3/ 12 Testing examples_f77 Passed 4/ 12 Testing examples_f95 Passed 5/ 12 Testing examples_java Passed 6/ 12 Testing examples_octave Passed 7/ 12 Testing examples_python Passed 8/ 12 Testing examples_tcl Passed 9/ 12 Testing examples_ada Passed 10/ 12 Testing examples_png Passed 11/ 12 Testing examples_svg Passed 12/ 12 Testing examples_pscairo Passed 100% tests passed, 0 tests failed out of 12 real 1m1.471s user 0m50.995s sys 0m3.020s These results all look great, but it turns out there are still parallel build dependency issues for the case of make -j N for large N (or N non-existent which corresponds to infinite N). So I will keep plugging away at this, but the good -j 2 results I have achieved today indicate I am on the right track Alan __________________________ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Plplot-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/plplot-devel
