Parallel compilation : does --jobs works ?

asked 2011-03-29 04:19:57 -0600

Willy Lambert
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updated 2011-03-29 04:42:17 -0600

tfoote

58457 ●128 ●550 ●526 http://www.ros.org/

Hi,

I have a debian installation of Diamondback and I did not succeed usung parallel compilation. I may build 2 packages at the same time using --threads, but when only building one package I can't ask it to build in parallel the exe. If I go into my package I can run make -j3 without any problem and it works.

Is it an issue in my CMakeLists or a rosmake issue ?

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answered 2011-03-29 07:05:34 -0600

Willy Lambert
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this is working : export ROS_PARALLEL_JOBS=-j3

but there is no way to make the --pjobs working. I have enougth with the former.

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This is the actual correct answer. rosmake --pjobs=4 or --threads=4 doesn't work for me either. Neither does export ROS_PARALLEL_JOBS=-l3 (-l instead of -j) as mentioned at http://www.ros.org/wiki/ROS/EnvironmentVariables#ROS_PARALLEL_JOBS

Felix Endres ( 2011-04-17 21:38:47 -0600 )edit

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answered 2011-03-29 06:59:59 -0600

tfoote

58457 ●128 ●550 ●526 http://www.ros.org/

Assuming you are talking about --pjobs. It does work.

It simply overrides the ROS_PARALLEL_JOBS environment setting. If you are using a package with just a Makefile you will have to pass it through in that Makefile. For example the kdl Makefile does this.

If you use mk/cmake.mk, as the default Makefile does, it also uses ROS_PARALLEL_JOBS when executing the Makefile generated by cmake.

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the kdl example helped. It thougth this was done automatically. So my projects with Makefile are now working with parallel build, and I think the cmakes one also. Thanks both !

Willy Lambert ( 2011-03-29 07:10:07 -0600 )edit

If the kdl Makefile would have used `${MAKE}` instead of `make`, the extra `ROS_PARALLEL_JOBS` in its makefile wouldn't have been necessary, right?