On Fri, 26 Jun 2009, Roberto Ragusa wrote:
It is really CPU intensive. I see some unicode related stuff in the changelog
and my memory goes to years ago (RedHat 8?) when the UTF8 enabled grep
got a similar slowdown (the lib was then improved after that).
Hmmmmm, made other experiments....
Really weird.
#time yum list updates --disablerepo=\* --enablerepo=ROB10\*
(less than 3 seconds)
#time yum list updates --disablerepo=\* --enablerepo=updates
(less than 3 seconds)
#time yum list updates --disablerepo=\* --enablerepo=ROB10\* --enablerepo=updates
(more than one minute)
ROB10\* is some local repositories, containing mirrored stuff from some
repositories, _including fedora_updates_, so the same rpms are found in two
different repositories. How can this trigger such a slowdown, I don't know.
I have to correct what I said before, the time is not always spent
on read64() and gettimeofday(); there is a lot of strace-silent activity
(just spurious brk() calls).
Maybe something like hashing of some data structure is taking a really bad
direction?
run:
time yum -d 3 --disablerepo=\* --enablerepo=ROB10\* \
--enablerepo=updates list updates | grep 'time:'
and post that output.
thanks,
-sv
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