[Twisted-Python] epoll reactor in Twisted 2.50 tarball

[Alvin Delagon]

Hello guys,

I have to install Twisted 2.50 on our Ubuntu Dapper servers. The problem is
that I have to use the Twisted 2.50 tarball since Dapper apt repositories
only have Twisted 2.40. The installation went smoothly and my twisted
applications works except that when I try to run my scripts using the epoll
reactor (twistd -ny ./myscript -r epoll) I get this error.

Traceback (most recent call last):
File "/usr/bin/twistd", line 21, in ?
run()
File "/usr/lib/python2.4/site-packages/twisted/scripts/twistd.py", line
27, in run
app.run(runApp, ServerOptions)
File "/usr/lib/python2.4/site-packages/twisted/application/app.py", line
374, in run
config.parseOptions()
File "/usr/lib/python2.4/site-packages/twisted/application/app.py", line
354, in parseOptions
usage.Options.parseOptions(self, options)
File "/usr/lib/python2.4/site-packages/twisted/python/usage.py", line 177,
in parseOptions
self.__dispatch[optMangled](optMangled, arg)
File "/usr/lib/python2.4/site-packages/twisted/python/usage.py", line 333,
in <lambda>
fn = lambda name, value, m=method: m(value)
File "/usr/lib/python2.4/site-packages/twisted/application/app.py", line
276, in opt_reactor
installReactor(shortName)
File "/usr/lib/python2.4/site-packages/twisted/application/reactors.py",
line 80, in installReactor
installer.install()
File "/usr/lib/python2.4/site-packages/twisted/application/reactors.py",
line 60, in install
namedAny(self.moduleName).install()
File "/usr/lib/python2.4/site-packages/twisted/python/reflect.py", line
357, in namedAny
topLevelPackage = __import__(trialname)
File "/usr/lib/python2.4/site-packages/twisted/internet/epollreactor.py",
line 22, in ?
from twisted.python import _epoll
ImportError: cannot import name _epoll


On my workstation (LinuxMint 3.0), the epoll reactor works fine. The
difference is that I installed Twisted via apt-get. Thanks in advance for
anyone who can point me to the right way.

---
Alvin Delagon

[Alvin Delagon]

Just fixed it guys. Forgot to install python-dev first. ^_^

Post by Alvin Delagon
Hello guys,
I have to install Twisted 2.50 on our Ubuntu Dapper servers. The problem
is that I have to use the Twisted 2.50 tarball since Dapper apt
repositories only have Twisted 2.40. The installation went smoothly and my
twisted applications works except that when I try to run my scripts using
the epoll reactor (twistd -ny ./myscript -r epoll) I get this error.
File "/usr/bin/twistd", line 21, in ?
run()
File "/usr/lib/python2.4/site-packages/twisted/scripts/twistd.py", line
27, in run
app.run (runApp, ServerOptions)
File "/usr/lib/python2.4/site-packages/twisted/application/app.py", line
374, in run
config.parseOptions()
File "/usr/lib/python2.4/site-packages/twisted/application/app.py", line
354, in parseOptions
usage.Options.parseOptions(self, options)
File "/usr/lib/python2.4/site-packages/twisted/python/usage.py", line
177, in parseOptions
self.__dispatch[optMangled](optMangled, arg)
File "/usr/lib/python2.4/site-packages/twisted/python/usage.py", line
333, in <lambda>
fn = lambda name, value, m=method: m(value)
File "/usr/lib/python2.4/site-packages/twisted/application/app.py", line
276, in opt_reactor
installReactor(shortName)
File "/usr/lib/python2.4/site-packages/twisted/application/reactors.py",
line 80, in installReactor
installer.install()
File "/usr/lib/python2.4/site-packages/twisted/application/reactors.py",
line 60, in install
namedAny(self.moduleName).install()
File "/usr/lib/python2.4/site-packages/twisted/python/reflect.py", line
357, in namedAny
topLevelPackage = __import__(trialname)
File
"/usr/lib/python2.4/site-packages/twisted/internet/epollreactor.py", line
22, in ?
from twisted.python import _epoll
ImportError: cannot import name _epoll
On my workstation (LinuxMint 3.0), the epoll reactor works fine. The
difference is that I installed Twisted via apt-get. Thanks in advance for
anyone who can point me to the right way.
---
Alvin Delagon

[David Bolen]

Post by Alvin Delagon
I have to install Twisted 2.50 on our Ubuntu Dapper servers. The problem is
that I have to use the Twisted 2.50 tarball since Dapper apt repositories
only have Twisted 2.40. The installation went smoothly and my twisted
applications works except that when I try to run my scripts using the epoll
reactor (twistd -ny ./myscript -r epoll) I get this error.
(...)

When you built Twisted (through the setup.py script) it will build the
epoll reactor if it can find the /usr/include/sys/epoll.h header file.
So you might check if that is present on the system where you built
Twisted. If not, you're probably missing some development packages.

On my Ubuntu feisty system the file comes as part of the libc6-dev
package.

-- David