Improve code builder for parallel builds (up to 4 times faster than before)

HISTORY.rst

@@ -7,6 +7,7 @@ PlatformIO 2.0
 2.5.0 (2015-12-??)
 ~~~~~~~~~~~~~~~~~~
 
+* Improved code builder for parallel builds (up to 4 times faster than before)
 * Generate `.travis.yml <http://docs.platformio.org/en/latest/ci/travis.html>`__
   CI config for embedded projects by default
   (`issue #354 <https://github.com/platformio/platformio/issues/354>`_)

platformio/__init__.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-VERSION = (2, 5, "0.dev0")
+VERSION = (2, 5, "0.dev1")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"

platformio/platforms/base.py

@@ -15,6 +15,7 @@
 import os
 import re
 from imp import load_source
+from multiprocessing import cpu_count
 from os.path import isdir, isfile, join
 
 import click
@@ -389,6 +390,8 @@ class BasePlatform(object):
                 [
                     "scons",
                     "-Q",
+                    "-j %d" % self.get_job_nums(),
+                    "--warn=no-no-parallel-support",
                     "-f", join(util.get_source_dir(), "builder", "main.py")
                 ] + variables + targets,
                 stdout=util.AsyncPipe(self.on_run_out),
@@ -432,3 +435,9 @@ class BasePlatform(object):
         self._last_echo_line = line
 
         click.secho(line, fg=fg, err=level < 3)
+
+    def get_job_nums(self):
+        try:
+            return cpu_count()
+        except NotImplementedError:
+            return 1