Fix performance regression from version 4.0.0 #386
Merged
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#384 introduced a performance regression caused by
inspect.stack()
.To give an idea of the size of the problem, collecting tests from a test suite with ~7000 test is 7x slower than it used to be in pytest 3.2.1.
This PR addresses the issue by using lower-level api calls (sys._getframe + inspect.getframeinfo)