[LON-CAPA-dev] Viewing Student sequences/Access Servers
Scott Harrison
lon-capa-dev@mail.lon-capa.org
Fri, 08 Feb 2002 09:25:59 -0500
Some unofficial answers:
Mark Lucas wrote:
>
> (2) When setting up a second access server, load balancing is accomplished
> by .... ? Placing the server in the list spares.tab?
Yes.
>
> How is the load at which the request is 'passed along' determined?
The least loaded server; lonnet.pm.
Determined essentially from /proc/loadavg (see lond).
cat /proc/loadavg; the fraction of processes that aren't getting
cpu time over the last minute, 5 minutes, 15 minutes, and then
I don't know the final two numbers.
# ------------------------------ Find server with least workload from
spare.tab
sub spareserver {
my $tryserver;
my $spareserver='';
my $lowestserver=100;
foreach $tryserver (keys %spareid) {
my $answer=reply('load',$tryserver);
if (($answer =~ /\d/) && ($answer<$lowestserver)) {
$spareserver="http://$hostname{$tryserver}";
$lowestserver=$answer;
}
}
return $spareserver;
}
>
> How would I double my library server as an access server in a case of
> emergencies (ie., really high loads).
treat it like one; place it in spare.tab; library servers have
access server functionality (plus "much much more")
>
> I was seeing some peak loads in the >3 category for yesterday evening,
> and there are some complaints about system access. On the order of 20-26
> httpd children are kept alive most of the time.
>
congratulations? :) hmmm... maybe we need to look at how many httpd
children
are allowed to work at any one time.. don't know
-Scott
> Thanks,
>
> Mark
>
> ----------------------------------------------------------------------------
> Mark Lucas email: lucasm@ohiou.edu
> 252D Clippinger Lab phone: (740)597-2984
> Department of Physics and Astronomy fax: (740)593-0433
> Ohio University
> Athens, OH 45701
>
> _______________________________________________
> LON-CAPA-dev mailing list
> LON-CAPA-dev@mail.lon-capa.org
> http://mail.lon-capa.org/mailman/listinfo/lon-capa-dev
--
Scott Harrison -- Graduate Student
Microbiology and Molecular Genetics
Mich. State. Univ., East Lansing, MI
harris41@msu.edu, 517-353-0998