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More research into this issue: I compiled the unittest.exe
executable on my main (desktop) computer, ran it under my primary OS
(Win7 64) and it failed.. I then ran <b>the exact same executable
(no recompile) </b>on my Linux Partition (Ubuntu 10.10 64) using
Wine and it failed.<br>
<br>
I then ran the <b>exact same executable</b> on my laptop on my
primary OS (also Win7 64) and it passed. I ran it on my laptop's
Linux partition under Wine (Ubuntu 10.10 32) and it passed. <br>
<br>
The only difference between the two systems that might account for
this is that the laptop has an Intel Penryn CPU, whereas the desktop
as an AMD Brisbane CPU. Does anyone know whether different x86 CPUs
can produce subtly different floating point results when executing
the exact same code? Alternatively, is it possible that some
processor-specific optimizations to some function getting called by
Don's code could be causing slightly different results?<br>
<br>
On 11/20/2010 9:25 PM, Brad Roberts wrote:
<blockquote cite="mid:4CE8830B.7040903@puremagic.com" type="cite">
<pre wrap="">The auto tester is on win7 32 bit.
On 11/20/2010 5:43 PM, David Simcha wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Yes, I'm running Windows 7 64-bit. In addition to running 32-bit Windows, Don
is running Windows XP IIRC. It's probably related somehow to different C
runtimes. At any rate, the unit tests need to be made lenient enough that such
minor details as constant folding and minor differences in C runtimes don't make
the difference between passing and failing. I don't understand the code well
enough to do this myself, but I'm willing to help by testing whatever Don asks
me to test. Also, after this issue is cleared up, I'll probably try
re-committing the dynamic-to-static changeset, as I'm pretty sure the problem
here is with the unit tests, not the changes.
On 11/20/2010 8:10 PM, Jonathan M Davis wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Didn't you say that you were running 64 bit windows whereas Don said that he was
running 32 bit windows? Could that be having any effect?
</pre>
</blockquote>
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