01-16-2012
Thanks for sharing your story. It's very true that most of the times we do not bother to check the time of the clock before scheduling stuffs.
We maintain IT infrastructure for a big pharma company. For any SLA (service level agreement) breach, my employer has to pay a real big amount of money to the client. Now that's been told, once my colleague had to schedule a maintenance on an AIX server. We have a procedure to do that. There's a lot of approvals from service delivery managers of both the client and our company required. After getting those, this guy went on scheduling the reboot of the machine in maintenance mode in cron a day before. The next day, I got a call from IT Incident management people saying a server is down before it's scheduled maintenance window. It happened around 20 minutes before the scheduled time. We had to raise a severity for this. Upon checking the root cause of this later, we found somehow the server was failing to sync with the NTP server and the clock was going 20 minutes faster than the actual time.
And yes, because of all these, we breached the SLA!
This User Gave Thanks to admin_xor For This Post:
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LEARN ABOUT DEBIAN
time::warp
Warp(3pm) User Contributed Perl Documentation Warp(3pm)
NAME
Time::Warp - control over the flow of time
SYNOPSIS
use Time::Warp qw(scale to time);
to(time + 5); # 5 seconds ahead
scale(2); # make time flow twice normal
DESCRIPTION
Our external experience unfolds in 3 1/2 dimensions (time has a dimensionality of 1/2). The Time::Warp module offers developers control
over the measurement of time.
API
o to($desired_time)
The theory of relativity asserts that all physical laws are enforced relative to the observer. Since the starting point of time is
arbitrary, it is permissable to change it. This has the effect of making it appear as if time is moving forwards or backward
instanteously. For example, on some types of operating systems time starts at Wed Dec 31 19:00:00 1969 (this will likely change as we
approach 2030 and with the acceptance of 64-bit CPUs).
to(time + 60*60); # 1 hour ahead
o scale($factor)
Changes the speed at which time is progressing.
scale(scale * 2); # double the speed of time
Note that it is not possible to stop time or cause it to reverse since this is forbidden by the second law of thermodynamics.
ALSO SEE
Time::HiRes and Event.
SUPPORT
Please direct your insights or complaints to perl-loop@perl.org.
DISCLAIMER
THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THIS IS NOT A TIME MACHINE. THIS MODULE CANNOT BE USED TO VIOLATE THE SECOND LAW OF
THERMODYNAMICS.
COPYRIGHT
Copyright X 1999, 2000 Joshua Nathaniel Pritikin. All rights reserved. This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
perl v5.14.2 2000-08-02 Warp(3pm)