One cause of krb5 test suite slowness on some systems
raeburn at MIT.EDU
Fri Jan 30 23:50:49 EST 2009
On Jan 30, 2009, at 23:01, Greg Hudson wrote:
> 1. We start daemons like kadmind and then run "tail -f" on a log
> file to
> see when they have started. On most systems, "tail -f" polls its
> once per second, so that's a one-second delay per system. You can
> around this problem on Linux by running "tail -f -s 0.01" instead to
> force faster polling. This workaround reduced my runtime from 12m to
> 10m on my system, although that's pretty unscientific due to the next
More portably, for the daemons looking at the [logging] stanza, we
could tell them to additionally log to stderr, and have expect watch
for output directly, and do away with the polling.
> None of these issues is trivially fixed in a clean, portable fashion,
> but we have some ideas, and I believe Ken is working on some
> improvements to #3 using t_inetd.
Fixed just now, for some of our tests. The ones that run as root
still need tweaking.
With this in place, we can probably also get rid of the code in
various daemon programs for listening for a connection on a given port
number, and assume they'll always be run under something inetd-like.
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