svn commit: r228143 - in head: . share/mk tools/build/options

[Brooks Davis]

On Mon, Dec 19, 2011 at 12:41:29PM -0800, Steve Kargl wrote:
> On Mon, Dec 19, 2011 at 08:09:32PM +0000, David Chisnall wrote:
> > On 19 Dec 2011, at 19:52, Warner Losh wrote:
> > 
> > > -1.  The needs of the many?  Please.  Let's break a useful feature because some people don't understand it and are impatient?  That's lame.
> > 
> > How useful is gprof-based profiling these days?  Now that we
> > have the DTrace pid provider, don't we have access to much more
> > fine-grained profiling information without the need for shipping
> > two versions of every library?
> 
> It is quite uesful given that for the last 20 or so years,
> I can do 
> 
> cc -o z -pg a.c -lm_p
>  ./z
> gprof -b -l ./z z.gmon | more
> 
>   %   cumulative   self              self     total           
>  time   seconds   seconds    calls  ms/call  ms/call  name    
>  72.1       0.91     0.91        0  100.00%           _mcount [1]
>  11.1       1.05     0.14  8388608     0.00     0.00  sinf [4]
>   8.2       1.16     0.10  8388608     0.00     0.00  nextafterf [5]
>   4.6       1.21     0.06        0  100.00%           .mcount (9)
> 
> to ge the information I want.

I'd tend to agree that we should leave it on at least in HEAD.

> dtrace(1M) does not seem to contain an example that gives the
> equivalent information.  In fact, the manpage contains no examples,
> only the statement:
> 
>   See the Solaris Dynamic Tracing Guide for detailed examples
>   of how to use the dtrace utility to perform these tasks.
> 
> which, of course, is not very useful given that I do not have a
> Solaris Dynamic Tracing Guide.

http://docs.oracle.com/cd/E19253-01/817-6223/ is it and the first hit in
google...

-- Brooks
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