Message info
 
To:pypy-commit@python.org From:ctismer Subject:[pypy-commit] pypy default: finally made the timing work under windows, which is probably a fake QPC Date:Sun, 18 Mar 2012 16:32:18 +0100 (CET)
 

Author: Christian Tismer <tismer@stackless.com>
Branch:
Changeset: r53790:aaffe3362a4b
Date: 2012-03-18 16:30 +0100
http://bitbucket.org/pypy/pypy/changeset/aaffe3362a4b/

Log: finally made the timing work under windows, which is probably a fake
QPC

diff --git a/pypy/jit/backend/test/runner_test.py b/pypy/jit/backend/test/runner_test.py
--- a/pypy/jit/backend/test/runner_test.py
+++ b/pypy/jit/backend/test/runner_test.py
@@ -1496,13 +1496,30 @@
c_nest, c_nest], 'void')

def test_read_timestamp(self):
+ if sys.platform == 'win32':
+ # windows quite often is very inexact (like the old 8259 PIC),
+ # so we stretch the time a little bit.
+ # On my virtual Parallels machine in a 2GhZ Core i7 Mac Mini,
+ # the test starts working at delay == 21670 and stops at 20600000.
+ # We take the geometric mean value.
+ from math import log, exp
+ delay_min = 21670
+ delay_max = 20600000
+ delay = int(exp((log(delay_min)+log(delay_max))/2))
+ def wait_a_bit():
+ for i in xrange(delay): pass
+ else:
+ def wait_a_bit():
+ pass
if longlong.is_64_bit:
got1 = self.execute_operation(rop.READ_TIMESTAMP, [], 'int')
+ wait_a_bit()
got2 = self.execute_operation(rop.READ_TIMESTAMP, [], 'int')
res1 = got1.getint()
res2 = got2.getint()
else:
got1 = self.execute_operation(rop.READ_TIMESTAMP, [], 'float')
+ wait_a_bit()
got2 = self.execute_operation(rop.READ_TIMESTAMP, [], 'float')
res1 = got1.getlonglong()
res2 = got2.getlonglong()
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