From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nathan Lynch Date: Thu, 14 Jun 2012 10:02:45 -0500 Subject: [Buildroot] [PATCHv2 7/7] automatically set PARALLEL_JOBS when BR2_JLEVEL is 0 In-Reply-To: <1339466983-19786-8-git-send-email-ntl@pobox.com> References: <1339466983-19786-8-git-send-email-ntl@pobox.com> Message-ID: <1339686165-10145-1-git-send-email-ntl@pobox.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net When BR2_JLEVEL is 0, set PARALLEL_JOBS to double the number of CPUs detected. This allows one to more or less fully utilize the host system without manually tuning the configuration. Also make 0 the default value for BR2_JLEVEL. Signed-off-by: Nathan Lynch --- v2: Updated to use double number of detected CPUs per Arnout and Peter. Config.in | 8 +++++--- package/Makefile.in | 5 +++++ 2 files changed, 10 insertions(+), 3 deletions(-) diff --git a/Config.in b/Config.in index 95c2e8c..3745255 100644 --- a/Config.in +++ b/Config.in @@ -178,10 +178,12 @@ config BR2_DEBIAN_MIRROR endmenu config BR2_JLEVEL - int "Number of jobs to run simultaneously" - default "2" + int "Number of jobs to run simultaneously (0 for auto)" + default "0" help - Number of jobs to run simultaneously + Number of jobs to run simultaneously. If 0, determine + automatically according to number of CPUs on the host + system. config BR2_CCACHE bool "Enable compiler cache" diff --git a/package/Makefile.in b/package/Makefile.in index 9177a1b..95e0ae6 100644 --- a/package/Makefile.in +++ b/package/Makefile.in @@ -6,7 +6,12 @@ HOSTMAKE=$(MAKE) endif HOSTMAKE :=$(shell which $(HOSTMAKE) || type -p $(HOSTMAKE) || echo make) +ifeq ($(BR2_JLEVEL),0) +PARALLEL_JOBS:=$(shell echo \ + $$((2 * `getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1`))) +else PARALLEL_JOBS:=$(BR2_JLEVEL) +endif MAKE1:=$(HOSTMAKE) -j1 MAKE:=$(HOSTMAKE) -j$(PARALLEL_JOBS) -- 1.7.10.2