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Generate parallel network traffic to test a server
Apache httpd - log files and log tools example from a Well House Consultants training course
More on Apache httpd - log files and log tools [link]
Source code: o10x Module: A606
#!/usr/bin/env perl
my $host = 'http://yourdomainfortest.co.uk'; my $queLength = 25; # Number of different jobs at same time my $VERBOSE = 1; # Read file of URLs to be tested # Best extracted from a log file to mimic loading proportions and order open ( URLS, "<$ARGV[0]" ) or die "Cannot open input file: $ARGV[0]\n$!\n"; $SIG{CHLD} = 'IGNORE'; # to avoid buildup of zombies my @urls; my @que; chomp (@urls = <URLS>); foreach my $url ( @urls ) { $url = $host . $url; next if $url =~ /\'/; # Start off a new request via ab pipe (*{$url},RETHAND); print "Requesting $url\n" if $VERBOSE > 0; # Starts in child process so that parent can continue if (!($pid = fork())) { # Could also use the LWP library in Perl ... my $cmd = "/usr/local/apache2/bin/ab -c 4 -n 4 '$url'"; my $val=`$cmd`; # When child has completed, tell the parent print RETHAND "Completed $url\n"; print RETHAND "$val\n" if $VERBOSE > 1; print RETHAND "xyzz\n"; close(RETHAND); exit(); } # Parent queues up the child push @que, $url; # If parent has less than maximum children, go start another straight away next if @que < $queLength; # If parent has reached maximum children level, wait for oldest child to complete # Note - if some children are very slow this may result in a temporary lower load # as younger ones finish first my $waitfor = shift @que; while ($response = <$waitfor> ) { last if ($response =~ /xyz/); print "$response" if $VERBOSE > 0; } } # Loop exits while the final batch is still running - add wait code? Learn about this subject
This module and example are covered on the following public courses:
* Deploying Apache and Tomcat * Deploying Java Applications on Linux / Unix Also available on on site courses for larger groups Books covering this topic
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