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module Benchmark
# Perform caclulations on Timing results.
module Timing
# Microseconds per second.
MICROSECONDS_PER_SECOND = 1_000_000
# Calculate (arithmetic) mean of given samples.
# @param [Array] samples Samples to calculate mean.
# @return [Float] Mean of given samples.
def self.mean(samples)
sum = samples.inject(:+)
sum / samples.size
end
# Calculate variance of given samples.
# @param [Float] m Optional mean (Expected value).
# @return [Float] Variance of given samples.
def self.variance(samples, m=nil)
m ||= mean(samples)
total = samples.inject(0) { |acc, i| acc + ((i - m) ** 2) }
total / samples.size
end
# Calculate standard deviation of given samples.
# @param [Array] samples Samples to calculate standard deviation.
# @param [Float] m Optional mean (Expected value).
# @return [Float] standard deviation of given samples.
def self.stddev(samples, m=nil)
Math.sqrt variance(samples, m)
end
# Recycle used objects by starting Garbage Collector.
def self.clean_env
# rbx
if GC.respond_to? :run
GC.run(true)
else
GC.start
end
end
# Use a monotonic clock if available, otherwise use Time
begin
Process.clock_gettime Process::CLOCK_MONOTONIC, :float_microsecond
# Get an object that represents now and can be converted to microseconds
def self.now
Process.clock_gettime Process::CLOCK_MONOTONIC, :float_microsecond
end
# Add one second to the time represenetation
def self.add_second(t, s)
t + (s * MICROSECONDS_PER_SECOND)
end
# Return the number of microseconds between the 2 moments
def self.time_us(before, after)
after - before
end
rescue NameError
# Get an object that represents now and can be converted to microseconds
def self.now
Time.now
end
# Add one second to the time represenetation
def self.add_second(t, s)
t + s
end
# Return the number of microseconds between the 2 moments
def self.time_us(before, after)
(after.to_f - before.to_f) * MICROSECONDS_PER_SECOND
end
end
end
end
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