[Python-talk] Python socket speed ups?

[bruce.labitt at autoliv.com]

As some of list may know, I've been working on a client-server application 
using python.  I prototyped the whole system, sockets and all, using 
python.  Since then, I have rewritten the server in C/C++ to exploit the 
very fast FFT algorithm in FFTW.  Although the profiling is incomplete, it 
is now indicating that the client, which is written entirely in python 
2.5.2, is likely the bottleneck.  ( 66% of run time is waiting for the 
data transfer )

It is appearing that the server is waiting for the client to send the 
data.  I'm using socket.sendall.  Is there something that can be done to 
boost the speed of the send?  The data is present, it is just taking a 
long time to be sent - much longer than the network speed would indicate. 

The server is receiving 80,673,600 bytes in ~4.575 seconds, which works 
out to ~141E6 bits/sec.  Very respectable for most, but not quite good 
enough for the application.  I'd like to see 2-3x that.  This is on a 
1Gbit link that is about 50m long using CAT6 cable.

Is there a way to speed up the send?  OS network buffers?  Python speed 
up?  Call sockets in C?

Thanks for your suggestions!  I really appreciate them.


Oh, yeah, the list is too quiet :P

Best Regards,
Bruce 

Bruce Labitt
Autoliv Electronics
1011B Pawtucket Blvd, PO Box 1858
Lowell, MA  01853

Email: bruce.labitt at autoliv.com. 
Tel:  (978) 674-6526
Fax: (978) 674-6581 

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