Disclaimer: the numbers here are too low for mod_perl, because my machine
is to slooooow :( I'll rerun the same tests on a much faster machine
before releasing the new version of the Guide.
=head1 Benchmarking Apache::Registry and Perl Content Handler
=head2 Empty scripts
First lets see the overhead that Apache::Regsitry adds. In order to do
that we will use an almost empty scripts, that only send a basic
header and one word as a content.
The I<registry.pl> script running under C<Apache::Registry>:
registry.pl
-----------
use strict;
print "Content-type: text/plain\r\n\r\n";
print "Hello";
The Perl Content handler:
Benchmark/Handler.pm
--------------------
package Benchmark::Handler;
use Apache::Constants qw(:common);
sub handler{
$r = shift;
$r->send_http_header('text/html');
$r->print("Hello");
return OK;
}
1;
with settings:
PerlModule Benchmark::Handler
<Location /benchmark_handler>
SetHandler perl-script
PerlHandler Benchmark::Handler
</Location>
The benchmark:
% ab -n 1000 -c 10 http://localhost/perl/benchmarks/registry.pl
Requests per second: 21.27
Time taken for tests: 43.924 seconds
Connnection Times (ms)
min avg max
Connect: 0 3 218
Processing: 223 435 679
Total: 223 438 897
% ab -n 1000 -c 10 http://localhost/benchmark_handler
Requests per second: 49.03
Time taken for tests: 20.394 seconds
Connnection Times (ms)
min avg max
Connect: 0 1 201
Processing: 59 201 605
Total: 59 202 806
So we can see that the average added overhead is about:
438 - 202 = 236 milli-seconds
per script.
=head2 Heavy Scripts
Of course this overhead is insignificant when the code itself is
significantly heavier and slower. Let's leave the above code examples
umodified but add some CPU intensive processing operation (it can be
also an IO operation or a database query.)
my $x = 100;
my $y = log ($x ** 100) for (0..10000);
% ab -n 1000 -c 10 http://localhost/perl/benchmarks/registry.pl
Time taken for tests: 121.944 seconds
Requests per second: 8.20
Connnection Times (ms)
min avg max
Connect: 0 11 950
Processing: 747 1204 888
Total: 747 1215 1838
%ab -n 1000 -c 10 http://localhost/benchmark_handler
Time taken for tests: 41.166 seconds
Requests per second: 24.29
Connnection Times (ms)
min avg max
Connect: 0 3 150
Processing: 73 407 1211
Total: 73 410 1361
META: something is wrong here! It shouldn't be that slower. Should try
run it on a faster machine!
______________________________________________________________________
Stas Bekman | JAm_pH -- Just Another mod_perl Hacker
http://stason.org/ | mod_perl Guide http://perl.apache.org/guide
mailto:[EMAIL PROTECTED] | http://perl.org http://stason.org/TULARC/
http://singlesheaven.com| http://perlmonth.com http://sourcegarden.org
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