diff options
| author | Michael Hope <michael.hope@linaro.org> | 2011-09-29 12:40:42 +1300 |
|---|---|---|
| committer | Michael Hope <michael.hope@linaro.org> | 2011-09-29 12:40:42 +1300 |
| commit | 1c0488792d245101ceb4efca2223574c44fd0e67 (patch) | |
| tree | 1266a3164c02bc1c1fc9e6397b3cc459eb968a0f | |
| parent | 89cf5bb67fdae093db25ecb6a50f25a835c8ca6c (diff) | |
| download | crosstool-ng-1c0488792d245101ceb4efca2223574c44fd0e67.tar.gz crosstool-ng-1c0488792d245101ceb4efca2223574c44fd0e67.tar.bz2 crosstool-ng-1c0488792d245101ceb4efca2223574c44fd0e67.zip | |
config: add a 'auto' value for the number of parallel jobs
When CT_PARALLEL_JOBS is -1, set the number of parallel jobs to the
number of online CPUs + 1. Update documentation to match.
I find this useful when building in the cloud. You can use the same
.config file and have the build adapt to the number of processors
available. Limited testing shows that NCPUS+1 is faster than NCPUS+0
or NCPUS+2.
Signed-off-by: Michael Hope <michael.hope@linaro.org>
| -rw-r--r-- | config/global/build-behave.in | 2 | ||||
| -rw-r--r-- | scripts/crosstool-NG.sh.in | 6 |
2 files changed, 7 insertions, 1 deletions
diff --git a/config/global/build-behave.in b/config/global/build-behave.in index ebf08b2d..7092a7f1 100644 --- a/config/global/build-behave.in +++ b/config/global/build-behave.in @@ -16,6 +16,8 @@ config PARALLEL_JOBS Enter 1 (or 0) to have only one job at a time. + Enter -1 to set automatically based on how many processors the host has. + config LOAD int prompt "Maximum allowed load" if ! BACKEND diff --git a/scripts/crosstool-NG.sh.in b/scripts/crosstool-NG.sh.in index c2f35f6b..6b6aa0e3 100644 --- a/scripts/crosstool-NG.sh.in +++ b/scripts/crosstool-NG.sh.in @@ -488,7 +488,11 @@ if [ -z "${CT_RESTART}" ]; then # And help make go faster JOBSFLAGS= - [ ${CT_PARALLEL_JOBS} -ne 0 ] && JOBSFLAGS="${JOBSFLAGS} -j${CT_PARALLEL_JOBS}" + # Use the number of processors+1 when automatically setting the number of + # parallel jobs. Fall back to 1 if the host doesn't use GLIBC. + AUTO_JOBS=$((`getconf _NPROCESSORS_ONLN 2> /dev/null || echo 0` + 1)) + [ ${CT_PARALLEL_JOBS} -eq -1 ] && JOBSFLAGS="${JOBSFLAGS} -j${AUTO_JOBS}" + [ ${CT_PARALLEL_JOBS} -gt 0 ] && JOBSFLAGS="${JOBSFLAGS} -j${CT_PARALLEL_JOBS}" [ ${CT_LOAD} -ne 0 ] && JOBSFLAGS="${JOBSFLAGS} -l${CT_LOAD}" # We need to save the real .config with kconfig's value, |