jackcartersmith/blackmagic
1
0
Fork 0
Code Issues Pull Requests Releases Activity

Allow make to build libs/examples in parallel.

Browse Source 
You cannot issue make inside a for loop if you want to let it run in
parallel.  Performance increases seen:

10:03 < zyp> I tested make all -j8 without your change, it takes 8.7s
10:03 < zyp> so on my cpu, your change gives >2x speedup

My own cpu gives more modest speed increases, of only about 20%.
This commit is contained in:
Karl Palsson 2012-10-30 10:03:12 +00:00
parent a1f4c29872
commit 90cdddd96b
1 changed files with 18 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
Makefile
View File

@ -51,21 +51,21 @@ cleanheaders:
./scripts/irq2nvic_h --remove $$yamlfile ; \
done
lib: generatedheaders
$(Q)for i in $(addprefix $@/,$(TARGETS)); do \
if [ -d $$i ]; then \
printf " BUILD $$i\n"; \
$(MAKE) -C $$i SRCLIBDIR=$(SRCLIBDIR) || exit $?; \
fi; \
done
LIB_DIRS:=$(wildcard $(addprefix lib/,$(TARGETS)))
$(LIB_DIRS): generatedheaders
@printf " BUILD $@\n";
$(Q)$(MAKE) --directory=$@ SRCLIBDIR=$(SRCLIBDIR)
examples: lib
$(Q)for i in $(addsuffix /*/*,$(addprefix $@/,$(TARGETS))); do \
if [ -d $$i ]; then \
printf " BUILD $$i\n"; \
$(MAKE) -C $$i || exit $?; \
fi; \
done
lib: $(LIB_DIRS)
$(Q)true
EXAMPLE_DIRS:=$(sort $(dir $(wildcard $(addsuffix /*/*/Makefile,$(addprefix examples/,$(TARGETS))))))
$(EXAMPLE_DIRS): lib
@printf " BUILD $@\n";
$(Q)$(MAKE) --directory=$@
examples: $(EXAMPLE_DIRS)
$(Q)true
install: lib
@printf " INSTALL headers\n"
@ -86,9 +86,10 @@ install: lib
doc:
$(Q)$(MAKE) -C doc doc
# Bleh http://www.makelinux.net/make3/make3-CHP-6-SECT-1#make3-CHP-6-SECT-1
clean: cleanheaders
$(Q)for i in $(addprefix lib/,$(TARGETS)) \
$(addsuffix /*/*,$(addprefix examples/,$(TARGETS))); do \
$(Q)for i in $(LIB_DIRS) \
$(EXAMPLE_DIRS); do \
if [ -d $$i ]; then \
printf " CLEAN $$i\n"; \
$(MAKE) -C $$i clean SRCLIBDIR=$(SRCLIBDIR) || exit $?; \
@ -97,5 +98,5 @@ clean: cleanheaders
@printf " CLEAN doxygen\n"
$(Q)$(MAKE) -C doc clean
.PHONY: build lib examples install doc clean generatedheaders cleanheaders
.PHONY: build lib $(LIB_DIRS) examples $(EXAMPLE_DIRS) install doc clean generatedheaders cleanheaders