Python / Socket speed

msj

Seems like sockets are about 6 times faster on OpenSUSE than on
Windows XP in Python.

http://pyfanatic.blogspot.com/2007/0...rformance.html

Is this related to Python or the OS?

/MSkou

Feb 26 '07 #1

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Richard Brodie

<ms*@infoserv.dkwrote in message
news:11*********************@a75g2000cwd.googlegro ups.com...

Seems like sockets are about 6 times faster on OpenSUSE than on
Windows XP in Python.

http://pyfanatic.blogspot.com/2007/0...rformance.html

Is this related to Python or the OS?

It's 6 times faster even when not using Python, so what do you think?
It's probably 'just' tuning though, the default window sizes are in the
same ratio.

Feb 26 '07 #2

Paul Boddie

On 26 Feb, 15:54, "m...@infoserv.dk" <m...@infoserv.dkwrote:

Seems like sockets are about 6 times faster on OpenSUSE than on
Windows XP in Python.

http://pyfanatic.blogspot.com/2007/0...rformance.html

Is this related to Python or the OS?

>From the output:

TCP window size: 8.00 KByte (default)
TCP window size: 49.4 KByte (default)

I don't pretend to be an expert on TCP/IP, but might the window size
have something to do with it?

Paul

Feb 26 '07 #3

casevh

On Feb 26, 7:05 am, "Paul Boddie" <p...@boddie.org.ukwrote:

On 26 Feb, 15:54, "m...@infoserv.dk" <m...@infoserv.dkwrote:

Seems like sockets are about 6 times faster on OpenSUSE than on
Windows XP in Python.

http://pyfanatic.blogspot.com/2007/0...rformance.html

Is this related to Python or the OS?
From the output:
TCP window size: 8.00 KByte (default)
TCP window size: 49.4 KByte (default)

I don't pretend to be an expert on TCP/IP, but might the window size
have something to do with it?

Paul

Tuning the TCP window size will make a big difference with Windows XP
performance. I'm more curious about the original script. Either the
test was against the loopback address, or he has a very impressive
netork to sustain 1.8Gbit/s.

casevh

Feb 26 '07 #4

John Nagle

Richard Brodie wrote:

<ms*@infoserv.dkwrote in message
news:11*********************@a75g2000cwd.googlegro ups.com...

>>Seems like sockets are about 6 times faster on OpenSUSE than on
Windows XP in Python.

http://pyfanatic.blogspot.com/2007/0...rformance.html

Is this related to Python or the OS?

It's 6 times faster even when not using Python, so what do you think?
It's probably 'just' tuning though, the default window sizes are in the
same ratio.

Sockets and pipes are a terrible way to do local interprocess
communication, but it's what we've got. The problem is that what you
want is a subroutine call, but what the OS gives you is an I/O operation.
If you want to see it done right, take a look at QNX messaging. QNX
does everything, including I/O and networking, via its interprocess
communication message passing system. There's the cost of one extra
copy for every I/O operation, but you don't notice it much in practice.
I've run 640x480x15FPSx24bits video through QNX messaging and only used
2% of an 1.5GHZ x86 CPU doing it.

John Nagle

Feb 26 '07 #5

Paul Rubin

John Nagle <na***@animats.comwrites:

Sockets and pipes are a terrible way to do local interprocess
communication, but it's what we've got. The problem is that what you
want is a subroutine call, but what the OS gives you is an I/O operation.

Using TCP sockets is ridiculous but Unix domain sockets aren't that
bad. There's also mmap or shm.

Feb 26 '07 #6

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