Konstantin Osipov kostja.osi...@gmail.com added the comment:
I was able to observe the same issue:
I'm using Python 2.6.5 on Ubuntu 10.0.4 LTS. My system is 64 bit Intel Core I7,
Quad core, Linux kernel 2.6.32-generic x86_64, Ubuntu EGLIBC 2.11.1-0ubuntu7.5.
A simple client TCP socket, which
Sam samsli...@gmail.com added the comment:
I know this bug is closed, but I too am experiencing it under Linux
2.6.24-22 and Python 2.5.2.
I'm using urllib2, and it's just spending an obscene amount of cpu time
in {method 'recv' of '_socket.socket' objects}
Anyone have any ideas?
Would
Antoine Pitrou [EMAIL PROTECTED] added the comment:
Yes, obviously. Although adding it to the client socket did make no
difference after I had already done so for the server. Still
communication is too slow by orders of magnitude. (Sorry for pointing
this out again)
Well, if this precise
Changes by Antoine Pitrou [EMAIL PROTECTED]:
--
resolution: - invalid
status: open - closed
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Python tracker [EMAIL PROTECTED]
http://bugs.python.org/issue3766
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Thorben [EMAIL PROTECTED] added the comment:
That's more like it. Now I'd like to see the same behavior on Linux...
2008/9/12 Gabriel Genellina [EMAIL PROTECTED]:
Gabriel Genellina [EMAIL PROTECTED] added the comment:
I've tested it on Windows XP. MSG_WAITALL is not supported, but I
Changes by Giampaolo Rodola' [EMAIL PROTECTED]:
--
nosy: +giampaolo.rodola
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Python tracker [EMAIL PROTECTED]
http://bugs.python.org/issue3766
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Python-bugs-list
Antoine Pitrou [EMAIL PROTECTED] added the comment:
Thorben, is the problem still there if you use fork() rather than
launching a separate thread for the server?
The implementation of the recv() method is straightforward and I don't
see anything that could cause a huge latency there, it's just
Thorben [EMAIL PROTECTED] added the comment:
The problem exists even if the server part is replaced by a server
written in C. I only wrote up the dummy server in python to be able to
provide a testcase.
The C server works with reasonable speed when connected to a client
written in perl by the
Antoine Pitrou [EMAIL PROTECTED] added the comment:
You can use setsockopt() to set the TCP_NODELAY flag and see if that
improves things; sending thousands of 4-bytes packets isn't exactly the
expected utilization of TCP.
As I said, socket.recv() is just a thin wrapper above the same-named C
Thorben [EMAIL PROTECTED] added the comment:
2008/9/11 Antoine Pitrou [EMAIL PROTECTED]:
Antoine Pitrou [EMAIL PROTECTED] added the comment:
You can use setsockopt() to set the TCP_NODELAY flag and see if that
improves things; sending thousands of 4-bytes packets isn't exactly the
expected
Antoine Pitrou [EMAIL PROTECTED] added the comment:
now thats interesting:
adding the line sock.setsockopt(SOL_TCP, TCP_NODELAY, 1) decreased
the delay by half. It still is extremely high but it's a start.
Did you do it on both the client and server sockets?
Would be interesting to
Thorben [EMAIL PROTECTED] added the comment:
2008/9/11 Antoine Pitrou [EMAIL PROTECTED]:
Antoine Pitrou [EMAIL PROTECTED] added the comment:
now thats interesting:
adding the line sock.setsockopt(SOL_TCP, TCP_NODELAY, 1) decreased
the delay by half. It still is extremely high but it's a
Gabriel Genellina [EMAIL PROTECTED] added the comment:
I've tested it on Windows XP. MSG_WAITALL is not supported, but I
replaced it using a while loop. I didn't notice any extraneous delay.
500 packets @ 2 tokens each (500 very short lists)
0.140999794006
16008 function calls in
Thorben Krueger [EMAIL PROTECTED] added the comment:
As promised, here is the profiler output for a Mac (thanks Stefan). The
problem does NOT occur here, which should help greatly in tracking down
the cause in the socket library. Anyone into this?
$ python runme.py
500 packets @ 2 tokens each
New submission from Thorben Krueger [EMAIL PROTECTED]:
Under Linux 2.6.24-1-amd64 as well as 2.6.26 (x86-32), Python versions
2.5.2 and 2.4.4 (on both machines), there is a huge discrepancy between
socket read latencies, depending on code context.
Some detail:
For a university project, I wrote
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