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AsyncPing-2016.1207
River stage zero No dependents
/ AsyncPing

NAME

AsyncPing - ping a huge number of servers in several seconds

VERSION

Version 2016.1207

SYNOPSIS

  use AsyncPing;
  use Data::Dumper;

  my $asyncping=new AsyncPing(timeout=>3,try=>2);
  my @servers=("host1","host2","host3");
  my $result=$asyncping->ping(\@servers);
  print Dumper $result;

DESCRIPTION

  First of all, I tried some of the Async Ping modules on cpan, none of them really worked when I tried to ping 10,000 servers.
  This AsyncPing is designed to ping a huge number of servers. As I tested, it can send out ICMP request to 25,000 servers per second on a very common server.
  Also I tested if I fork a seperate process handling the recieving work, it can be improved to about 45,000 ping per second.
  The timeout value start to work after this module sends out all the requests. 
  The retry will only work on the failed ones.

  Please notice that ICMP is not TCP connection, there is no guarantee that if you send a request to a server, you'll get a response. So you may want to set the try to 2.
  So if you have a million servers to ping(10% of them are down) and you set the timeout to 3 and retry to 2, I can estimate the time to be about (1M/25k+3)+(100k/25k+3)=50 seconds.

  Please also notice that since ICMP can only be sent by root, if you want to use this library, you'll have to run your program as root.
  If the ping requests are going through firewall, your ping requests could possibly be discarded by firewall, don't blame the library.

  since every process share same network interface and usually there is only 1 network interface on a server, I think it doens't really help if you make it parallel 
  or multi-threaded to increase speed. Just like you don't get much benefit if you make more threads while you have only 1 CPU. But you can test on your own, good luck!

AUTHOR

Xinfeng Wang(xinfwang@ebay.com)

BUGS

Please report any bugs or feature requests to bug-asyncping at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=AsyncPing. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc AsyncPing

You can also look for information at:

ACKNOWLEDGEMENTS

LICENSE AND COPYRIGHT

Copyright 2016 Xinfeng Wang.

This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:

http://www.perlfoundation.org/artistic_license_2_0

Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License. By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license.

If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure that your Modified Version complies with the requirements of this license.

This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder.

This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement, then this Artistic License to you shall terminate on the date that such litigation is filed.

Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.