[dmd-internals] [D-Programming-Language/dmd] 2f7ce3: add gc for Windows dmd

[Brad Roberts]

The dmd test suite is all small apps, but the phobos test on win32 is 
still one app (still not particularly large, but essentially the sum of 
the posix tests).  On posix the phobos tests are small test apps.

On Saturday, September 24, 2011 3:53:44 PM, Walter Bright wrote:
> I've gotten similar results. It's worse than I'd thought it would be. The addition of the gc substantially slows
> things down. Granted, the gc could be tuned, but this is a very inauspicious start.
>
> Of course, the test suite is all small programs. How a large one behaved would be interesting.
>
> Fortunately, the gc can be swapped in and out with a commenting/uncommenting 2 lines in win32.mak.
>
> On 9/24/2011 2:10 PM, Brad Roberts wrote:
>> Looks like the execution time for dmd and phobos have increased fairly
>> substantially since the gc was checked in.
>>
>>    http://d.puremagic.com/test-results/platform-history.ghtml?os=Win_32
>>    http://d.puremagic.com/test-results/platform-history.ghtml?os=Linux_32
>>
>> The linux link is just for comparison to show that no increase has
>> occurred there.  On windows the phobos test time has increased from
>> approx 8 minutes to approx 10 minutes, or 25%.  The dmd test has
>> increased from approx 27 minutes (much more variation and I didn't
>> compute an average or std dev) to approx 39 minutes (with only one
>> completed data point so far, so, well, grain of salt), almost doubling.
>>
>> A few more runs will help show the averages better, but still worth
>> being concerned about.  That's a significant performance hit to the
>> compiler.
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