#jython IRC Log (v0.9)

Index

IRC Log for 2010-08-09

Timestamps are in GMT/BST.

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[19:02] <jbrendel> Hello!
[19:03] <jbrendel> I have a strange problem with urllib (or actually, any of the Python HTTP libraries (also urllib2, httplib, httplib2, etc., it's always the same)).
[19:03] <jbrendel> The issues seems to be that some times the name resolution takes terribly long. However, if I use Java's URL class, then I don't seem to have this issue.
[19:04] <jbrendel> Here's an example: Access to api.twitter.com. If you do a name lookup, you get a bunch of results, like so: http://pastebin.com/J65khLD0
[19:04] <jbrendel> Now if I access a URL there using urllib, it takes around 30 seconds in which it does nothing, before I get a result. Code: http://pastebin.com/eE893Eja
[19:05] <jbrendel> When I then do the very same thing, using Java's URL class (also from the Jython shell), I get the result within 1 second or so. Code: http://pastebin.com/upkPUsr9
[19:05] <jbrendel> I have seen some server installations where I can run the test and urllib actually performs equally well.
[19:06] <jbrendel> However, I also know that I'm not the only one with that issue: People in other places have tried the code and it goes slow for them as well.
[19:06] <jbrendel> Does anyone know what's going on here? Can anyone else reproduce this?
[19:07] <jbrendel> BTW, this is not DNS caching, because I can alternate access via urllib or URL and urllib is consistently slow, while URL is consistently quick.
[19:14] <agronholm> will try to reproduce it in a moment
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[19:35] <jbrendel> Should also point out that urllib with native Python (CPython) does NOT have that problem. Only under Jython.
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[21:30] <agronholm> socket.getaddrinfo() takes an abormally long time indeed
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[22:22] <jimbaker> sabi: for http://www.acm.uiuc.edu/jython-buildbot/waterfall, the 2 linux instances are offline. anyone we should contact?
[22:23] <jimbaker> also, are we just seeing timeouts for the os x build? or something else?
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[22:24] <jimbaker> of course it could be related to what agronholm and jbrendel are reporting, that socket can be very slow
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[22:55] <sabi> jimbaker: i think socket deadlocks on os x
[22:55] <sabi> most of the time
[22:56] <jimbaker> well, not for me
[22:56] <sabi> weird.
[22:56] <jimbaker> so something strange for sure
[22:57] <jimbaker> by deadlock, do you mean an actual deadlock? perhaps we could run a deadlock monitor with jmx
[22:57] <jimbaker> at the very least it's useful for the regrtest as a whole to do i would imagine
[22:58] <jimbaker> obligatory jython book plug - http://jythonpodcast.hostjava.net/jythonbook/en/1.0/Concurrency.html#deadlocks
[22:59] <jimbaker> sabi: ^^^
[23:22] <sabi> hehe
[23:22] * sabi nods
[23:22] <sabi> if you can set up something i can run it.
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Index

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