Twisted February 2018

twisted@python.org

2 participants
7 discussions

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing

by Glyph Lefkowitz

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ t w i s t e d m a t r i x . c o m http://www.twistedmatrix.com/~glyph/

2 months, 1 week

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2 years, 5 months

[Twisted-Python] Circular references in TLSMemoryBIOProtocol

by Ilya Skriblovsky

Hello, I have the Twisted app that serves tons of short-lived TLS connections using TLSMemoryBIOFactory. I usually set loosened garbage collector thresholds in production environment for the sake of performance. But I've noticed that this app's RAM usage quickly grows up to unreasonable values. Digging into the issue using pdb and objgraph showed that protocol instances are still living long after they were closed. I found two circular dependencies which are created for each TLS connection: 1. Between twisted.protocols.policies.ProtocolWrapper and its self.wrappedProtocol 2. Between twisted.protocols.tls.TLSMemoryBIOProtocol and its self._tlsConnection Both of them cause protocol instance to not be deleted when the connection is closed. So all OpenSSL-related objects and all business-related data attached to that protocol instance are still living untill the next GC collection. This affects both RAM usage and performance (due to much more often GC collections) I've tried to fix both circular dependencies: replaced https://github.com/twisted/twisted/blob/trunk/src/twisted/protocols/policie… by self.wrappedProtocol.makeConnection(weakref.proxy(self)) and replaced https://github.com/twisted/twisted/blob/trunk/src/twisted/protocols/tls.py#… by: self._tlsConnection = self.factory._createConnection(weakref.proxy(self)) Memory usage pattern changed drastically after this change. I've created demo script that makes 10k TLS loopback connections with GC disabled and measures the number of objects are still living after the work is done and total resident RAM consumption: https://gist.github.com/IlyaSkriblovsky/4dd3abfd5f67c64b13f1c673f56466f9 Output without the fix: N = 10000 , K = 100 objects before 50136 DummyServerProtocols still living 10000 objects after 439919 mem 778 mb Output with the fix: N = 10000 , K = 100 objects before 50133 DummyServerProtocols still living 0 objects after 159919 mem 96 mb So using weakrefs makes all protocol instances and instances of TLSMemoryBIOProtocol to be deleted right after a connection is closed. Less circular-dependent objects → less GC invocations → better performance. And I see much nicer RAM usage pattern in my app. Is it possible to fix circular deps in some more clean way? Can this be solved at all while user's code is able to try to touch both sides of circular dep after connection is closed? Please advice Thanks for consideration Best regards, Ilya

3 years, 7 months

[Twisted-Python] Weekly Bug Summary

by trac＠twistedmatrix.com

3 years, 7 months

[Twisted-Python] txtorcon 0.20.0

by meejah

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I'm very happy to release txtorcon 0.20.0. This includes a few minor new features and an important bug fix if you're using a Tor new enough to have all the *PortLines changes (anything after 0.3.0.6; see Tor issue #20956). Full list of changes: * doc fixes (from hotelzululima) * Issue 246: fix endpoints so .connect on them works properly more than once (from Brian Warner) * allow a CertificateOptions to be passed as tls= to endpoints * PR 252: add method txtorcon.Tor.is_ready * PR 252: add method txtorcon.Tor.become_ready * PR 253: fix handling of certain defaults (*PortLines and friends) * fix last router (usually) missing with (new) `MicroDescriptorParser` * use OnionOO via Onion service tgel7v4rpcllsrk2.onion for txtorcon.Router.get_onionoo_details * fix parsing of Router started-times * Issue 255: removed routers always deleted following NEWCONSENSUS * Issue 279: remember proxy endpoint if it was Deferred You can download the release from PyPI or GitHub (or of course "pip install txtorcon"): https://pypi.python.org/pypi/txtorcon/0.20.0 https://github.com/meejah/txtorcon/releases/tag/v0.20.0 Releases are also available from the hidden service: http://timaq4ygg2iegci7.onion/txtorcon-0.20.0.tar.gz http://timaq4ygg2iegci7.onion/txtorcon-0.20.0.tar.gz.asc You can verify the sha256sum of both by running the following 4 lines in a shell wherever you have the files downloaded: cat <<EOF | sha256sum --check dc80cb76b3ddacef6d671c0a088cb1a45274c0858554c32ce55d0f41421c740e txtorcon-0.20.0.tar.gz a957b3dc10f0b2b882ef6ad46d2932fa7731d5eeee6d52ba9d736d2bc4f1385f txtorcon-0.20.0-py2.py3-none-any.whl EOF thanks, meejah -----BEGIN PGP SIGNATURE----- iQEcBAEBAgAGBQJaj2AIAAoJEMJgKAMSgGmnnGUIANXkNIF8c98nwCa4Q9Xws3Hv 9zAJSWsDst/58lHka6bE5d1JWYz78fTubTC2ofOFH0MOkjeSyEtgTO58xlKY9wTC w7ohePwcV+md1wPOpciHVZMBVhqUhKGqNhMYehTXjcCEwppgXhiINgGFLaF0XSUM aJzY7laEvg2E/1p+gH0e4tkJuSVKVOK+5MWBali8YlOZY28R6w/X0Q0n8su1ntl2 bKsxpTrv+p8J+K7WvpeaXIuZnC/fRwVFZ0vtwzKtrTKimAE60yPfOi5hLUyW2PGx FkpH6B0bgl5FMiY+Y0PV8rP2DXikCibpwsipBh4AHpTYGSdMkSogjiRupkJxeeQ= =GsVt -----END PGP SIGNATURE-----

3 years, 7 months

[Twisted-Python] Weekly Bug Summary

by trac＠twistedmatrix.com

3 years, 8 months

[Twisted-Python] Weekly Bug Summary

by trac＠twistedmatrix.com

3 years, 8 months

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Twisted February 2018