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From "Farid Zaripov" <Farid_Zari...@epam.com>
Subject RE: incorrect pass rate for 23.deque.iterators on Windows
Date Tue, 27 Mar 2007 16:17:58 GMT
> -----Original Message-----
> From: Martin Sebor [mailto:sebor@roguewave.com] 
> Sent: Friday, March 23, 2007 6:29 PM
> To: stdcxx-dev@incubator.apache.org
> Subject: incorrect pass rate for 23.deque.iterators on Windows
> 
> While looking at our Windows nightly test results I spotted 
> what I suspect to be a case of some bad math in the exec 
> utility when calculating percentages. The 23.deque.iterators 
> test is reported as failing 0 out of a total of 77,810,809 
> assertions and its pass rate as being 44%. This happens with 
> both MSVC 7.1 and 8.0. The pass rate is clearly wrong but I 
> suspect the 77 million assertions isn't really correct either 
> (on UNIX we consistently get 4,915,404).
> 
> 23.deque.iterators.exe   0   0   77810809   0   44%   3.203
> 
> I'm guessing it's one of two things: either we have a Windows 
> specific bug in our code in exec, or there is a bug in both 
> versions of MSVC that causes this.
> 
> Andrew or Farid, do you guys have any insight?

  The difference between asserts on UNIX and MSVC is because of the
following lines of the test
23.deque.iterators.cpp, line 259:
-----------------------
#ifndef _RWSTD_NO_REPLACEABLE_NEW_DELETE
// replacement operator new is expensive, avoid long runtimes
unsigned rw_opt_nloops = 6;      // for --nloops
#else
unsigned rw_opt_nloops = 10;     // for --nloops
#endif
-----------------------

  The invalid percents value (44%) have been calculated as (driver.cpp,
line 1059):

long (77810809 * 100) / 77810809 == 3486113604 / 77810809 = 44.

Farid.

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