On 5 Mar 99, at 1:21, Michael A. Stone wrote:
> that wouldn't work for a multithreaded webserver. each of the
> child processes needs to write to the log, so the kind of lock
> you're thinking of would also shut them out. instead, the
> processes use an atomic 'find the end of the file and add a line
> to it' operation. that's enough to keep them from tripping
> over each other's feet, without cutting off anyone's air.
First, thanks for the additional info on inodes. I think I am getting
there.
Your paragraph above reminded me of something I might mention.
I had told webtrends to ignore referers from the domain I was
monitoring. I did this blissfully for a few months. I would run
reports every week. Then a few months later I ran one report for all
the past months. But this time I did not filter referers from the
domain I was monitoring. The user sessions number changed!!
I was on the phone to webtrends. They said that Apache was known to
write an image request to the log file before the actual html file
which contained the image. In webtrends a referer must begin with an
html file (not an image). Since I was ignoring referers from the
domain I was monitoring this user session was not counted as it began
from the very domain. Very interesting. They promised to show me
examples of this but I took their word for it. I have since
discontinued filtering referers from the domain being monitored and
thus increasing the user sessions.
This leads me to a question I have. What is accepted as really
defining user sessions? I know some peopel claim it as impossible but
I think it should be used as a general guideline. What happens if I
decide not to use the default 30 minutes which Webtrends uses? I
could certainly increase my user sessions if I reduce that time.
Anyone know where I can find some definitions in this area?
Peter
Might is not Right. But there is a lot of Might knocking
about in this world, and something has to be done about it.
-- King Arthur, The Once and Future King
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