From: tip-bot for Ingo Molnar <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, acme@redhat.com, hpa@zytor.com,
mingo@kernel.org, a.p.zijlstra@chello.nl, namhyung@kernel.org,
jolsa@redhat.com, dsahern@gmail.com, tglx@linutronix.de
Subject: [tip:perf/core] tools/perf/build: Automatically build in parallel , based on number of CPUs in the system
Date: Mon, 14 Oct 2013 22:18:10 -0700 [thread overview]
Message-ID: <tip-2cfbe880f0a8eed7beabade3e06fd53f999b3e32@git.kernel.org> (raw)
Commit-ID: 2cfbe880f0a8eed7beabade3e06fd53f999b3e32
Gitweb: http://git.kernel.org/tip/2cfbe880f0a8eed7beabade3e06fd53f999b3e32
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Wed, 2 Oct 2013 11:18:28 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 9 Oct 2013 08:48:54 +0200
tools/perf/build: Automatically build in parallel, based on number of CPUs in the system
Implement automatic parallel builds when building in tools/perf:
$ time make
# [ perf build: Doing 'make -j12' parallel build. ]
Auto-detecting system features:
...
real 0m9.265s
user 0m59.888s
sys 0m6.082s
On GNU make achieving this is not particularly easy, it requires a separate
makefile, which then invokes the main Makefile.
( Note: this patch adds Makefile.parallel to show the concept - the two
makefiles will be flipped in the next patch to avoid having to specify -f
to get parallelism in the default build. )
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-dvBjwqiTyzrufzkz8oanhpf9@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
tools/perf/Makefile.parallel | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/tools/perf/Makefile.parallel b/tools/perf/Makefile.parallel
new file mode 100644
index 0000000..ec5e08b
--- /dev/null
+++ b/tools/perf/Makefile.parallel
@@ -0,0 +1,26 @@
+#
+# Do a parallel build with multiple jobs, based on the number of CPUs online
+# in this system: 'make -j8' on a 8-CPU system, etc.
+#
+# (To override it, run 'make JOBS=1' and similar.)
+#
+ifeq ($(JOBS),)
+ JOBS := $(shell grep -c ^processor /proc/cpuinfo 2>/dev/null)
+ ifeq ($(JOBS),)
+ JOBS := 1
+ endif
+endif
+
+export JOBS
+
+$(info $(shell printf '# [ perf build: Doing '\''make \033[33m-j'$(JOBS)'\033[m'\'' parallel build. ]\n'))
+
+#
+# Needed if no target specified:
+#
+all:
+ @$(MAKE) --no-print-directory -j$(JOBS) $@
+
+%:
+ @$(MAKE) --no-print-directory -j$(JOBS) $@
+
reply other threads:[~2013-10-15 5:18 UTC|newest]
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