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Subject: Re: [boost] Proposed templated integer_sort
From: Steven Ross (spreadsort_at_[hidden])
Date: 2009-04-19 08:41:41

Thanks Steve, that was the problem.
Oddly, now that I've resolved these file I/O issues, MSVC works best with
similar constants to gcc, and it is slightly faster. Now, on MSVC I see a
27% speedup for integer_sort, 6X speedup for float_sort, and 136% speedup
for string_sort (relative to std::sort). The new version is in the boost
vault, named
As this zip file was built on my new (purchased for this project) Windows
system, it no longer has those annoying MacOS tag files in it. I verified
it works in gcc with my old mac system.

To make the tuning script cross-platform, I send undesired output to a
.tunelog file (/dev/null doesn't work on windows), I have duplicate rm/del
commands, and I modify the user's path to have "." in it for Windows (then
remove it when the script finishes). For some reason I haven't figured out,
it leaves a time.txt file in the directory instead of deleting it on
Windows, but I don't think that's a big deal.

I'm currently rerunning performance tests (trying to see if I can eliminate
the #ifdef MSVC), and once that is done and I've made some graphs for
Windows performance, I should be ready for a formal submission.

Steven Ross

On Sat, Apr 18, 2009 at 1:24 PM, Steven Watanabe <watanabesj_at_[hidden]>wrote:

> Steven Ross wrote:
>> What is the best platform-independent file I/O approach to use for writing
>> and reading bytes? ofstream writes 4031 bytes when I tell it to write
>> 4000
>> on Windows, so that doesn't seem appropriate.
> You probably need to open the file in binary mode.
> In Christ,
> Steven Watanabe
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