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require File.expand_path(File.join(File.dirname(__FILE__), "bench_helper"))
module Posix
extend FFI::Library
ffi_lib FFI::Library::LIBC
attach_function :gettimeofday, [ :buffer_out, :pointer ], :int
end
class Timeval < FFI::Struct
layout :tv_sec, :ulong, :tv_nsec, :ulong
end
iter = ITER
puts "Benchmark FFI gettimeofday(2) (nil, nil) performance, #{iter}x"
10.times {
puts Benchmark.measure {
iter.times { Posix.gettimeofday(nil, nil) }
}
}
puts "Benchmark FFI gettimeofday(2) (Timeval.alloc_out, nil) performance, #{iter}x"
10.times {
puts Benchmark.measure {
iter.times { Posix.gettimeofday(Timeval.alloc_out, nil) }
}
}
puts "Benchmark FFI gettimeofday(2) (Timeval.new(FFI::MemoryPointer.new), nil) performance, #{iter}x"
10.times {
puts Benchmark.measure {
iter.times { Posix.gettimeofday(Timeval.new(FFI::MemoryPointer.new(Timeval)), nil) }
}
}
puts "Benchmark FFI gettimeofday(2) (pre allocated pointer, nil) performance, #{iter}x"
10.times {
t = Timeval.new FFI::MemoryPointer.new(Timeval)
puts Benchmark.measure {
iter.times { Posix.gettimeofday(t, nil) }
}
}
puts "Benchmark Time.now performance, #{iter}x"
10.times {
puts Benchmark.measure {
iter.times { Time.now }
}
}
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