From: "phluid61 (Matthew Kerwin)" Date: 2013-07-19T22:14:24+09:00 Subject: [ruby-core:56088] [CommonRuby - Feature #8640] Add Time#elapsed to return nanoseconds since creation Issue #8640 has been updated by phluid61 (Matthew Kerwin). rosenfeld (Rodrigo Rosenfeld Rosas) wrote: > You're right, Matthew, although I'd appreciate some bookmark capabilities... But I understand it would be more costly since you'd need to malloc and free the struct everytime a bookmark is created... > > Tanaka, I believe most people are interested in elapsed time rather than absolute time (Process.clock_gettime, System.currentTimeMillis(), etc). Having to process the elapsed time in the Ruby side is probably slower than doing the math on the C side, right? clock_gettime allows you to choose which clock to get (on modern Linux, there are four), and if your relative timestamps are both Fixnums the difference between Ruby-land and C-land arithmetic is negligible. See: https://github.com/phluid61/ruby-experiments/tree/master/gettime ---------------------------------------- Feature #8640: Add Time#elapsed to return nanoseconds since creation https://bugs.ruby-lang.org/issues/8640#change-40586 Author: tenderlovemaking (Aaron Patterson) Status: Open Priority: Normal Assignee: Category: Target version: Hi, We time many things in Rails (and so does lots of other code), and I've found that we spend lots of time allocating and subtracting time objects. For example: start = Time.now ## do stuff we want to time finish = Time.now - start It would be nice if we could just create one time object and grab the nanoseconds elapsed since the time object was created like so: start = Time.now ## do stuff we want to time finished = start.elapsed # => nanoseconds elapsed. I've attached a patch that implements this feature. -- http://bugs.ruby-lang.org/