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Re: (timed) java -verbose ... printing nanoseconds when the function call was made ...

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"[no name]" wrote:
> Is it possible? Maybe using the OS? (like Solaris DTrace?)

Your post was a bit on the obscure side.  Your subject line was highly abbreviated and your question was not explained in the body of the post.  I understood you much better once I read Arne's answer, though. It is considered good netiquette to make the body of your post self-contained.

I'm afraid, though, that I am still not entirely clear on your need.  When you say (only in the subject) "printing nanoseconds when the function [sic] call was made", do you want to timestamp the point of the call, measure the duration of the method call, or what?

A quick glance at the documentation (!) for "java -verbose" and other options to the "java" command 
<http://download.oracle.com/javase/6/docs/technotes/tools/solaris/java.html>
shows that the only option that might have anything to do with timing is 
"java -Xprof".

Googling for "java +Xprof timing" 
<http://lmgtfy.com/?q=java+%2BXprof+timing>
yields some interesting-looking links.  The top one I see is 
<http://www.javaperformancetuning.com/news/qotm037.shtml>
which explains the option pretty well, but misspells "its" consistently.

However, <http://www.javaperformancetuning.com/> in general should be a useful site for you if you are trying to tune Java performance.

As Arne points out, nanosecond timing is a bit of a fantasy.  Not only will you have a hard time finding system timing to that accuracy, anything you do to time your Java system will affect the timing.  Plus Java is inherently non-deterministic (discount the specialty real-time Java implementations).  GC and HotSpot both perform differently depending on run-time conditions.  Given the vagueness of your initial question, I'm going to suggest that you have a lot of work ahead of you to design a rigorous timing approach that will provide any kind of meaningful results.

-- 
Lew

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(timed) java -verbose ... printing nanoseconds when the function call was made ... lbrt chx _ gemale - 2011-09-09 01:46 +0000
  Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Arne Vajhøj <arne@vajhoej.dk> - 2011-09-08 22:00 -0400
  Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Lew <lewbloch@gmail.com> - 2011-09-08 20:51 -0700
  Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Roedy Green <see_website@mindprod.com.invalid> - 2011-09-09 08:54 -0700
    Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-09 20:21 -0400
      Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Arne Vajhøj <arne@vajhoej.dk> - 2011-09-09 20:54 -0400
        Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-10 11:12 +0000
          Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Arne Vajhøj <arne@vajhoej.dk> - 2011-09-10 09:23 -0400
            Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Arne Vajhøj <arne@vajhoej.dk> - 2011-09-10 09:25 -0400
              Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-10 14:25 +0000
    Re: (timed) java -verbose ... printing nanoseconds when the function call was made ... Roedy Green <see_website@mindprod.com.invalid> - 2011-09-09 20:51 -0700

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