From: Brian Warner <warner@lothar.com>
Date: Thu, 19 Feb 2009 21:16:54 +0000 (-0700)
Subject: test_crawler: disable the percentage-of-cpu-used test, since it is too unreliable... 
X-Git-Tag: allmydata-tahoe-1.4.0~179
X-Git-Url: https://git.rkrishnan.org/?a=commitdiff_plain;h=ff9811211d45eb1384eca00d047daba33a1c9a41;p=tahoe-lafs%2Ftahoe-lafs.git

test_crawler: disable the percentage-of-cpu-used test, since it is too unreliable on our slow buildslaves. But leave the code in place for developers to run by hand.
---

diff --git a/src/allmydata/test/test_crawler.py b/src/allmydata/test/test_crawler.py
index a0a21cbb..26e03689 100644
--- a/src/allmydata/test/test_crawler.py
+++ b/src/allmydata/test/test_crawler.py
@@ -256,7 +256,13 @@ class Basic(unittest.TestCase, StallMixin, pollmixin.PollMixin):
         d.addCallback(_check)
         return d
 
-    def test_cpu_usage(self):
+    def OFF_test_cpu_usage(self):
+        # this test can't actually assert anything, because too many
+        # buildslave machines are slow. But on a fast developer machine, it
+        # can produce interesting results. So if you care about how well the
+        # Crawler is accomplishing it's run-slowly goals, re-enable this test
+        # and read the stdout when it runs.
+
         self.basedir = "crawler/Basic/cpu_usage"
         fileutil.make_dirs(self.basedir)
         serverid = "\x00" * 20
@@ -286,23 +292,17 @@ class Basic(unittest.TestCase, StallMixin, pollmixin.PollMixin):
         # seconds), the overhead is enough to make a nominal 50% usage more
         # like 30%. Forcing sleep_time to 0 only gets us 67% usage.
 
-        # the windows/cygwin buildslaves, which are slow (even by windows
-        # standards) and have low-resolution timers, get more like 7% usage.
-        # On windows I'll extend the allowable range.
-
-        min_ok = 20
-        min_cycles = 1
-        if "cygwin" in sys.platform.lower() or "win32" in sys.platform.lower():
-            min_ok = 3
-            min_cycles = 0
-
         start = time.time()
         d = self.stall(delay=4.0)
         def _done(res):
             elapsed = time.time() - start
             percent = 100.0 * c.accumulated / elapsed
-            self.failUnless(min_ok < percent < 70, "crawler got %d%%" % percent)
-            self.failUnless(c.cycles >= min_cycles, c.cycles)
+            # our buildslaves vary too much in their speeds and load levels,
+            # and many of them only manage to hit 7% usage when our target is
+            # 50%. So don't assert anything about the results, just log them.
+            print
+            print "crawler: got %d%% percent when trying for 50%%" % percent
+            print "crawler: got %d full cycles" % c.cycles
         d.addCallback(_done)
         return d