add blog post: parallel test suite

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+---
+date: 2011/07/25 15:53:00
+title: "parallel test suite"
+---
+
+As you may know, i3 v4.0 has a big test suite (currently 642 tests in 72
+files). As the test suite grew over time, the time needed to run all tests has
+increased. While we want to spend some time on removing the delays in the tests
+by properly checking if the X11 events have been processed, there also is an
+easier solution for now: Running the tests in parallel.
+
+I just <a
+href="http://code.stapelberg.de/git/i3/commit/?h=tree&id=4dde5bb863d6670f6aa70ef2b714e98ea2474dcd">pushed
+the commit to make our run script, complete-run.pl</a>, do exactly that.
+
+Have a look at the time which was necessary to run a test before this commit:
+
+    All tests successful.
+    Files=72, Tests=642, 139 wallclock secs (135.87 usr  0.47 sys + 34.86 cusr  3.12 csys = 174.32 CPU)
+    Result: PASS
+
+…and after this commit:
+
+    All tests successful.
+    Files=72, Tests=642, 48 wallclock secs ( 0.28 usr  0.40 sys + 37.04 cusr  3.37 csys = 41.09 CPU)
+    Result: PASS
+
+48 seconds vs. 139 seconds is a pretty impressive speed-up :).