On Monday 08 December 2008 18:41:25 Wolfgang Denk wrote:
> Add logic to the MAKEALL script to determine the number of CPU cores
> on the system, and run a parallel build if there is more than one.
> Usually this significantrly accelerates builds.
>
> Allow to manually adjust the number of parallel make jobs by using
> the "BUILD_NCPUS" environment variable.
>
> Signed-off-by: Wolfgang Denk <[EMAIL PROTECTED]>
> ---
> MAKEALL | 11 ++++++++++-
> 1 files changed, 10 insertions(+), 1 deletions(-)
>
> diff --git a/MAKEALL b/MAKEALL
> index dbed268..a16549c 100755
> --- a/MAKEALL
> +++ b/MAKEALL
> @@ -1,6 +1,15 @@
> #!/bin/sh
>
> -: ${JOBS:=}
> +# Determine number of CPU cores if no default was set
> +: ${BUILD_NCPUS:="`getconf _NPROCESSORS_ONLN`"}
> +
> +if [ "$BUILD_NCPUS" -gt 1 ]no point in quoting here ... if it isnt numeric, then -gt will fail, and all numeric values lack whitespace ... > +then > + JOBS=-j`expr "$BUILD_NCPUS" + 1` > +else > + JOBS="" > +fi i generally see the heuristic (cpus * 2) rather than (cpus + 1) ... benchmarks tend to favor that as well ... but this is certainly better than previous behavior: always use -j1 ... -mike
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