max pleaner max pleaner - 7 months ago 12
Ruby Question

Run benchmark but don't print the result

I have a benchmark like follows:

benchmark_result = Benchmark.bm do |x|
x.report { send(test_name) }
end


When I run this, I'm seeing output from two places:


  1. The
    send(test_name)
    in the
    report
    block. I want to continue seeing this output.

  2. The output from the Benchmark block, i.e. the resulting benchmark report is printed to the console. I don't want this to happen.



I've seen from here how to temporarily hide the console output. But the problem is that I want the inner block to continue printing its output. I just don't want to see the benchmark results.

Answer

When you call the report method on the Benchmark::Report object sent to the block by Benchmark.bm or Benchmark.benchmark, it will print to STDOUT. If you're just interested in the benchmark metrics without printing a report, you can do this:

benchmark_result = Benchmark.measure do
  send(test_name) 
end

It returns a Benchmark::Tms object that looks like this:

 => #<Benchmark::Tms:0x007fb5b1b40118
 @cstime=0.0,
 @cutime=0.0,
 @label="",
 @real=4.5693013817071915e-05,
 @stime=0.0,
 @total=0.0,
 @utime=0.0>

If you're just interested in the elapsed real time used to execute your block, do the following (returns a Float):

benchmark_result = Benchmark.realtime do
  send(test_name) 
end