| Re: Thanks Henry Chapman! (for the FFTW3 DLM) [message #37499 is a reply to message #37430] |
Fri, 19 December 2003 21:22  |
h_chapman
Messages: 4
Registered: March 2003
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Junior Member |
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"Brian" <brian.huether@NOdlrSPAM.de> wrote in message news:<3741b78e71e3516a334f0146c49d3068@news.teranews.com>...
> Ok, seems that IDL54 differs from IDL6. My export.h header does not have a
> declaration for
>
> IDL_KW_RESULT_FIRST_FIELD
>
> Is this an IDL6 thing?
>
I wrote it all before IDL 6.0 came along - I can't quite remember
which version it was, but it works under 5.6. For earlier versions
you might be able to dig up S. Haugan's original post (search google
groups) and compare with what I did to find some sort of middle
ground.
> -brian
>
> "Brian" <brian.huether@NOdlrSPAM.de> schrieb im Newsbeitrag
> news:54696a862897cd16c1951085e9165b79@news.teranews.com...
>> Henry,
>>
>> I just noticed the reply you made to a post a I made a couple weeks ago
>> about the slowness of IDL's fft. I have spent quite some time figuring out
>> how to create a fftw3 dll and just suceeded at that yesterday. I was about
>> to spent quite a bit of time writing an extensive DLM and I saw that you
>> posted that very thing! So you saved me quite a bit of work. I noticed
> your
>> DLM has provisions for threads. Is that an altivec thing?
The threads is an fftw thing. They don't recommend that you use it
unless you have multiple processors. On a dual processor machine I
see a 20 to 30% speedup.
>> I am wondering if
>> your DLM will work transparently with my win32 dll. Though when I build
> the
>> dll, I did not specify multithreading in the config.h file. Also, how did
>> you combine the double and float functions? On windows, I suppose I would
>> create 2 static libraries (float and double) and then link them into one
>> overall dll?
>>
Sorry I don't know anything about windows. On unixes you create quite
a few libraries for the combinations of float and double, threaded and
non-threaded. Sorry I'm not being of much use, but hopefully someone
out there can get it working on windows and post results.
Henry.
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