Stefan Krah added the comment:

I'm convinced now that some systems just can't handle a low switch
interval gracefully. Look at:

 
http://buildbot.python.org/all/builders/x86%20Windows7%203.x/builds/5642/steps/test/logs/stdio


======================================================================
FAIL: test_pending_calls_race (test.test_concurrent_futures.ThreadPoolWaitTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File 
"D:\cygwin\home\db3l\buildarea\3.x.bolen-windows7\build\lib\test\test_concurrent_futures.py",
 line 71, in tearDown
    self.assertLess(dt, 60, "synchronization issue: test lasted too long")
AssertionError: 152.02985382080078 not less than 60 : synchronization issue: 
test lasted too long

----------------------------------------------------------------------


That test also uses sys.setswitchinterval(1e-6).

----------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15599>
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