Commit 5016aa02 authored by Nathan Lynch's avatar Nathan Lynch Committed by Peter Korsgaard
Browse files

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: default avatarNathan Lynch <ntl@pobox.com>
Signed-off-by: default avatarPeter Korsgaard <jacmet@sunsite.dk>
parent f6b26ea4

Config.in

+5 −3
Original line number Diff line number Diff line
@@ -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"

package/Makefile.in

+8 −0
Original line number Diff line number Diff line
@@ -6,7 +6,15 @@ HOSTMAKE=$(MAKE) 
endif

HOSTMAKE :=$(shell which $(HOSTMAKE) || type -p $(HOSTMAKE) || echo make)



# If BR2_LEVEL is 0, scale the maximum concurrency with the number of

# CPUs.  A coefficient of 2 is used in order to keep processors busy

# while waiting on I/O.

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)