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Various notes, all about PythonVarious notes, all about PythonPosted Sep 7, 2006 9:11 UTC (Thu) by dale77 (guest, #1490)Parent article: Various notes, all about Python
Hmmm. An interesting experiment to try @ home.
dale@gordon:~$ python
dale@gordon:~/blfs-sources/strace-4.5.14$ strace -p $(pidof python)
Um. Excuse me, its just sittin' there. No 10 wakes per second on this box.
What's up?
Dale
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Various notes, all about Python Posted Sep 7, 2006 9:50 UTC (Thu) by cortana (subscriber, #24596) [Link] Possibly. I just tried it on my Debian machine and observed a constant stream of select system calls.
Various notes, all about Python Posted Sep 7, 2006 9:52 UTC (Thu) by nduboc (subscriber, #23707) [Link] I tested on my Debian testing/unstable box and reproduce the select flood with python2.4 but not with python2.3.
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Various notes, all about Python Posted Sep 7, 2006 10:15 UTC (Thu) by dale77 (guest, #1490) [Link] I suppose the fact that it seems to be good on my LFS system could be dueto a fix in readline for LFS. When you build LFS the readline source is patched, as the LFS book says:
Upstream developers have fixed several issues since the initial release of
Dale
Various notes, all about Python Posted Sep 7, 2006 10:23 UTC (Thu) by shane (subscriber, #3335) [Link] The article indicates that the problem is from the readline library. Ifyour Python is not complied with the readline library, you would not see this behavior.
A simple test would be to hit "ctrl-R" and see if the interpreter asks for
Various notes, all about Python Posted Sep 7, 2006 10:34 UTC (Thu) by dale77 (guest, #1490) [Link] Ctrl-R reports (reverse-i-search) so on your authority readline appears tobe in there. As expected really, because python is not part of the base LFS build, while readline is.
Dale
Various notes, all about Python Posted Sep 7, 2006 12:34 UTC (Thu) by Dom2 (guest, #458) [Link] Is your version of python built with threading turned on? If not, you probably won't see it.
Various notes, all about Python Posted Sep 8, 2006 10:19 UTC (Fri) by dale77 (guest, #1490) [Link] I would have built it like this:
./configure --prefix=/usr --enable-shared &&
Various notes, all about Python Posted Sep 7, 2006 13:33 UTC (Thu) by amk (subscriber, #19) [Link] See the Python bug report. The select() code is only used with readline 2.1; more recent versions of readline use different interface code.
Various notes, all about Python Posted Sep 14, 2006 18:00 UTC (Thu) by dag- (subscriber, #30207) [Link] The Red Hat bugzilla report Jeff Waugh refered to, is not related to his findings of the python interactive shell.
In fact, Fedora or Red Hat (at least since Red Hat 7.2) do not have the readline <= 2.1 related problem Jeff found. Even Red Hat 7.2 comes with readline 4.2.
So Red Hat or Fedora is not affected by this 100ms wake-up issue, so maybe Python *is* ready for the enterprise, but Jeff's distribution is not ? :-)
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