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config: add a 'auto' value for the number of parallel jobs

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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>
This commit is contained in:
Michael Hope 2011-09-29 12:40:42 +13:00
parent 89cf5bb67f
commit 1c0488792d
2 changed files with 7 additions and 1 deletions
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2
config/global/build-behave.in
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@ -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

6
scripts/crosstool-NG.sh.in
View File

@ -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,