automatically set PARALLEL_JOBS when BR2_JLEVEL is 0
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 <ntl@pobox.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
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@ -178,10 +178,12 @@ config BR2_DEBIAN_MIRROR
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endmenu
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endmenu
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config BR2_JLEVEL
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config BR2_JLEVEL
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int "Number of jobs to run simultaneously"
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int "Number of jobs to run simultaneously (0 for auto)"
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default "2"
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default "0"
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help
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help
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Number of jobs to run simultaneously
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Number of jobs to run simultaneously. If 0, determine
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automatically according to number of CPUs on the host
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system.
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config BR2_CCACHE
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config BR2_CCACHE
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bool "Enable compiler cache"
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bool "Enable compiler cache"
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@ -6,7 +6,15 @@ HOSTMAKE=$(MAKE)
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endif
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endif
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HOSTMAKE :=$(shell which $(HOSTMAKE) || type -p $(HOSTMAKE) || echo make)
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HOSTMAKE :=$(shell which $(HOSTMAKE) || type -p $(HOSTMAKE) || echo make)
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# If BR2_LEVEL is 0, scale the maximum concurrency with the number of
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# CPUs. A coefficient of 2 is used in order to keep processors busy
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# while waiting on I/O.
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ifeq ($(BR2_JLEVEL),0)
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PARALLEL_JOBS:=$(shell echo \
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$$((2 * `getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1`)))
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else
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PARALLEL_JOBS:=$(BR2_JLEVEL)
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PARALLEL_JOBS:=$(BR2_JLEVEL)
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endif
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MAKE1:=$(HOSTMAKE) -j1
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MAKE1:=$(HOSTMAKE) -j1
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MAKE:=$(HOSTMAKE) -j$(PARALLEL_JOBS)
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MAKE:=$(HOSTMAKE) -j$(PARALLEL_JOBS)
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