Some weeks ago we have performance problems with 4 apache webservers.
When start investigate my question is arround of the number of clients connecting and your states.
To determine it, I quickly think... count it from Apache-status (previously enabled). For the code like this:
#!/usr/local/bin/perl -w
#
#
$|++;
use LWP::Simple;
my $server = shift || 'wks%02s.click21.com.br';
my $count = shift || 4;
my @Status = qw( _ S R K D L G . );
my ( %Info, %Status );
my @Info = qw( BusyServers IdleServers CPULoad ReqPerSec );
my $data;
my $n;
my $Mask = "http://$server/server-status?auto";
printf " " x 14;
map { printf(" %s ", $_ ) } @Status;
print "\t";
map { printf(" %4s", substr($_,0,4) ) } @Info;
print "\n";
for( $n = 1; $n <= $count; $n++ ) {
$data = get(sprintf($Mask, $n));
foreach my $l ( split(/\n/, $data) ) {
$Info{$1} = $2
if ( $l =~ m/^([^:]+):\s+(.*)/ );
}
# Define group status
foreach ( @Status ) {
$Status{$_} = ( $Info{Scoreboard} =~ s/$_//g ) || '-';
}
printf "%10s: ", substr( sprintf($server, $n), 0, 10 );
map { printf(" %3s", $Status{$_}) } @Status;
print "\t";
map { printf(" %-4s", substr($Info{$_},0,4) ) } @Info;
print "\n";
}
Data samples:
Data sample from /apache-status?auto
Total Accesses: 2144860
Total kBytes: 6671882
CPULoad: .38901
Uptime: 170975
ReqPerSec: 12.5449
BytesPerSec: 39959.1
BytesPerReq: 3185.29
BusyServers: 49
IdleServers: 23
Scoreboard: WWWWW___WR__WW_W_WWWWWD_R__WWWW_WWWWWWRWW__WW____W_W_WWWWR
+RWWWWW_R___WRR....
Results:
--- on demand result --
_ S R K D L G . Busy Idle CPUL ReqP
wks01.clic: 25 - 14 - 1 - - 216 44 25 .449 12.6
wks02.clic: 31 - 3 - 1 - - 221 28 31 .398 12.0
wks03.clic: 15 - 2 - 1 - - 238 22 15 .814 11.0
wks04.clic: 17 - 4 - 1 - - 1002 22 17 .535 10.8
Or, to other server:
Or:
$ ./monitor webmail%s.click21.com.br 8
_ S R K D L G . Busy Idle CPUL ReqP
webmail1.c: 6 - 4 22 - 1 - 223 47 6 3.27 11.7
webmail2.c: 8 - 5 37 - - - 206 70 8 1.70 14.0
webmail3.c: 11 - 4 43 - - - 198 68 11 1.82 13.7
webmail4.c: 14 - 2 33 - 2 - 205 60 14 2.61 12.5
webmail5.c: 9 - 3 22 - - - 222 51 9 1.50 14.2
webmail6.c: 2 - 6 75 - - - 173 111 2 2.33 12.9
webmail7.c: 11 - - 26 - - 1 218 54 11 .044 10.9
webmail8.c: 9 - 1 31 - - 2 213 59 9 .051 11.1
More info about:
Apache Status module
LWP::Simple
This code provide some data to diagnostics configuration problems.
More resources are great, if needs to explain by slot/child of apache, but itīs more hard to do, and need HTML::Parser.
