To clarify, I found the following in "Learning Perl".
It doesn't quite make sense to me, though. Perhaps someone
Can clarify what's going on in this?
defined(my $pid = fork) or die "Cannot fork: $!";
unless ($pid) {
# Child process is here
exec "date";
die "cannot exec date: $!";
}
# Parent process is here
waitpid($pid, 0);
It seems I could use that code, modified to start (5) processes,
And a waitpid() for each of those (5). It doesn't matter
Which processes would finish first. (I put the 5 in quotes,
Because right now I'm looking at using 5 different tools that
I want to monitor).
-Tony
-----Original Message-----
From: Akens, Anthony
Sent: Wednesday, December 03, 2003 12:58 PM
To: Tom Kinzer; [EMAIL PROTECTED]
Subject: RE: Timing several processes
I already have some ideas for how I want to build the page, how
to parse the data I will generate, etc.
As I said, I've looked at some of the other tools out there,
and want to stick to some simple perl code to parse out the
information and return the results.
The only bit I'm not sure of is how to tell if all forked processes
have completed before moving on.
-Tony
-----Original Message-----
From: Tom Kinzer [mailto:[EMAIL PROTECTED]
Sent: Wednesday, December 03, 2003 12:35 PM
To: [EMAIL PROTECTED]
Subject: RE: Timing several processes
http://poe.perl.org
Maybe this would be a good job for POE?
-Tom Kinzer
-----Original Message-----
From: Akens, Anthony [mailto:[EMAIL PROTECTED]
Sent: Wednesday, December 03, 2003 7:49 AM
To: [EMAIL PROTECTED]
Subject: Timing several processes
Hi all!
I'm wanting to write a simple web-based tool to see the status of
several servers at a glance. I know there are many solutions existing,
but I can't learn as much about perl by just using one
of those as I can by writing my own. The first step I want to do
is call a script from cron that runs several basic monitoring tools
(sar, vmstat, df, iostat, etc) and saves the output of each to a
file. Then I'd parse those files up, and write a summary file.
Easy enough. And I could certainly do it with by calling the tools one
at a time. However, I'd like to get roughly 1 minute of vmstat,
iostat, and sar output.... Simultaneously. So I'm supposing I'd
want to fork off each process, and then when those are all done
come back and run a script that then parses those results out for
the individual statistics I'm looking for.
I've never used fork before, and while it looks fairly straight forward
what I am not sure of is how to make sure all of those forked
processes have completed before moving on and parsing the files.
Any pointers?
Thanks in advance
-Tony
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