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== hitimes
* Homepage[http://copiousfreetime.rubyforge.org/hitimes]
* {Rubyforge project}[http://rubyforge.org/projects/copiousfreetime/]
* email jeremy at copiousfreetime dot org
* git clone url git://github.com/copiousfreetime/hitimes.git
== INSTALL
* gem install hitimes
== DESCRIPTION
Hitimes is a fast, high resolution timer library for recording
performance metrics. It uses the appropriate C method calls for each
system to get the highest granularity time increments possible.
It currently supports any of the following systems:
* any system with the POSIX call <tt>clock_gettime()</tt>,
* Mac OS X
* Windows
Using Hitimes can be faster than using a series of +Time.new+ calls, and
it will have a much higher granularity. It is definitely faster than
using +Process.times+.
== SYNOPSIS
=== Interval
Use Hitimes::Interval to calculate only the duration of a block of code
duration = Hitimes::Interval.measure do
# some operation ...
end
puts duration
=== TimedMetric
Use a Hitimes::TimedMetric to calculate statistics about an iterative operation
timed_metric = Hitimes::TimedMetric.new('operation on items')
Explicitly use +start+ and +stop+:
collection.each do |item|
timed_metric.start
# .. do something with item
timed_metric.stop
end
Or use the block. In TimedMetric the return value of +measure+ is the return
value of the block
collection.each do |item|
result_of_do_something = timed_metric.measure { do_something( item ) }
end
And then look at the stats
puts timed_metric.mean
puts timed_metric.max
puts timed_metric.min
puts timed_metric.stddev
puts timed_metric.rate
=== ValueMetric
Use a Hitimes::ValueMetric to calculate statistics about measured samples
value_metric = Hitimes::ValueMetric.new( 'size of thing' )
loop do
# ... do stuff changing sizes of 'thing'
value_metric.measure( thing.size )
# ... do other stuff that may change size of thing
end
puts value_metric.mean
puts value_metric.max
puts value_metric.min
puts value_metric.stddev
puts value_metric.rate
=== TimedValueMetric
Use a Hitimes::TimedValueMetric to calculate statistics about batches of samples
timed_value_metric = Hitimes::TimedValueMetric.new( 'batch times' )
loop do
batch = ... # get a batch of things
timed_value_metric.start
# .. do something with batch
timed_value_metric.stop( batch.size )
end
puts timed_value_metric.rate
puts timed_value_metric.timed_stats.mean
puts timed_value_metric.timed_stats.max
puts timed_value_metric.timed_stats.min
puts timed_value_metric.timed_stats.stddev
puts timed_value_metric.value_stats.mean
puts timed_value_metric.value_stats.max
puts timed_value_metric.value_stats.min
puts timed_value_metric.value_stats.stddev
== CHANGES
Read the HISTORY file.
== CREDITS
* Bruce Williams for suggesting the idea
== ISC License
Copyright (c) 2008 Jeremy Hinegardner
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
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