Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

79 lines (66 sloc) 1.739 kb
require 'thread'
class ThreadScalability
def initialize()
@mutex = Mutex.new
@cond_var = ConditionVariable.new
@num_ready_threads = 0
@num_threads = 0
@array_size = 120
@array = []
value = "0123456789" * 10000
@array_size.times {|count|
@array[count] = value.clone
}
end
def reverse_string(s)
len = s.length
(len/2).times { |i|
tmp = s[i]
s[i] = s[len -1 - i]
s[len -1 -i] = tmp
}
return s
end
def do_test()
concurrency = @num_threads
num_ops_per_thread = @array_size/@num_threads
threads = []
puts "concurrency is - #{concurrency}"
concurrency.times { |i|
threads << Thread.new {
puts "started thread #{i}"
# make sure all the threads start at the same time.
@mutex.synchronize {
@num_ready_threads += 1
@cond_var.wait(@mutex) while @num_ready_threads < @num_threads
@cond_var.signal if @num_ready_threads == @num_threads
}
puts "Thread #{i} running"
#now do the work.
reverse_strings(i*num_ops_per_thread, (i+1)*num_ops_per_thread - 1)
puts "Thread #{i} done"
}
}
threads.each {|t|
t.join
}
end
#to reverse a range of String elements in @array.
def reverse_strings(beginIndex, endIndex)
while beginIndex <= endIndex
puts "another 10 in #{Thread.current.inspect}" if beginIndex % 10 == 0
reverse_string(@array[beginIndex])
beginIndex += 1
end
end
def run(argument)
count = argument.to_i
@num_threads = count
t = Time.now
do_test()
puts "Time: #{Time.now - t}"
end
end
5.times {
ThreadScalability.new.run(ARGV[0].to_i)
}
Jump to Line
Something went wrong with that request. Please try again.