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<TITLE> [pycrypto] Changes for _fastmath.c to be able to built on MSVC 9.0 (aka VS2008)
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<H1>[pycrypto] Changes for _fastmath.c to be able to built on MSVC 9.0 (aka VS2008)</H1>
<B>cwt</B>
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TITLE="[pycrypto] Changes for _fastmath.c to be able to built on MSVC 9.0 (aka VS2008)">cwt at bashell.com
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<I>Fri Oct 15 06:33:29 CST 2010</I>
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<PRE>Hi,
I just tried to build pycrypto for python-2.6.6 (x64) on Windows 7, for
found that it can't build _fastmath because there is no GMP on Windows.
I google for a while and found MPIR (<A HREF="http://www.mpir.org/">http://www.mpir.org/</A>). There is a
script 'to_gmp.bat' in the MPIR build folder that rename mpir.lib, mpir.dll,
and the relevant header files to gmp.
After trying for 4 hours, I got a solution. (it may not accurate right, but
it just works.)
First, I build MPIR as Release|x86 for both lib and dll:
- open "Visual Studio 2008 x64 Win64 Command Prompt"
- cd mpir-2.1.3\build.vc9 # Change to the path that you extract MPIR.
- msbuild mpir.sln /p:Configuration=Release /p:Platform=x64
/t:lib_mpir_nehalem # <-- my cpu, you can try others.
- msbuild mpir.sln /p:Configuration=Release /p:Platform=x64
/t:dll_mpir_nehalem
- to_gmp.bat # Convert libraries and headers to GMP.
Then, copy *.h except config.h from *DLL *output to your python\PC
- cd mpir-2.1.3\build.vc9\dll\x64\Release
- mkdir C:\Python26\PC
- copy gmp*.h C:\Python26\PC
- copy mpir*.h C:\Python26\PC
And copy gmp.lib from *LIB *output to your python\PCbuild\amd64 # *Sound
weird?* But trust me, I already try other ways and they were failed.
- mkdir C:\Python26\PCbuild
- mkdir C:\Python26\PCbuild\amd64
- cd mpir-2.1.3\build.vc9\lib\x64\Release
- copy gmp.lib C:\Python26\PCbuild\amd64
Now, in the extracted pycrypto folder, I copy src\_fastmath.c to
src\_fastmath.cpp and do some changes on _fastmath.cpp to make it C++
friendly.
Well, the patch is quite large because I move the whole sieve_base to the
very top of the file. So you better see the patch file that I'm attached to
this mail.
I also change the setup.py to build the _fastmath.cpp instead of
_fastmath.c.
Finally, build the pycrypto and install it.
- python setup.py build
- python setup.py install --optimize=1
If you look in the C:\Python26\Lib\site-packages\Crypto\PublicKey, you will
found _fastmath.pyd.
Now, the most excited part! Let's benchmark it.
Without _fastmath (you can try it by rename _fastmath.pyd to something such
as _fastmath.xxx):
In [1]: from datetime import datetime
In [2]: from Crypto.PublicKey import pubkey
In [3]: def tdiff(n):
...: before = datetime.now()
...: pubkey.getStrongPrime(n)
...: print datetime.now()-before
...:
In [4]: tdiff(512)
0:00:00.348000
In [5]: tdiff(1024)
0:00:00.565000
In [6]: tdiff(2048)
0:00:03.308000
In [7]: tdiff(4096)
0:01:39.202000 # == (1*60)+39.202 == 99.202
With _fastmath:
In [1]: from datetime import datetime
In [2]: from Crypto.PublicKey import pubkey
In [3]: def tdiff(n):
...: before = datetime.now()
...: pubkey.getStrongPrime(n)
...: print datetime.now()-before
...:
In [4]: tdiff(512)
0:00:00.123000
In [5]: tdiff(1024)
0:00:00.333000
In [6]: tdiff(2048)
0:00:00.675000
In [7]: tdiff(4096)
0:00:06.446000
So, the conclusion:
n without with faster
_fastmath _fastmath
512 00.348 00.123 182.93%
1024 00.565 00.333 69.67%
2048 03.308 00.675 390.07%
4096 99.202 06.446 1438.97%
So, I think it's really worth to do (if you're stuck on Windows Platform).
Regards,
Chaiwat.S
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