[hobbit] fping tuning

[Schwimmer, Eric E *HS]

Hey that's pretty nifty.  However, after running gprof on the fping
gmon.out, I get a nice callgraph analysis and such, but all the times
are listed as 0.00.  Weird.

-Eric 

> -----Original Message-----
> From: Henrik Stoerner [mailto:henrik at hswn.dk] 
> Sent: Thursday, April 27, 2006 1:40 AM
> To: hobbit at hswn.dk
> Subject: Re: [hobbit] fping tuning
> 
> On Wed, Apr 26, 2006 at 05:49:45PM -0400, Schwimmer, Eric E *HS wrote:
> > So this leads me to believe that it is a problem solely 
> with fping;  if
> > they had a public forum or a mailing list, I'd be whining 
> there instead
> > of here. :)  I can't say that I was expecting to find the 
> 'magic bullet'
> > for this problem here, but I was hoping that there might be 
> some fping
> > wizard out there some magic bullets to spare.  Anywho, 
> thanks for your
> > thoughts, Henrik.  I'll poke some more at the fping code and see if
> > I can figure out whats going on (I doubt it)
> 
> I haven't spent much time looking at the fping code, so I have no idea
> how well it's been optimized. It might be an idea to compile fping 
> with profiling enabled (i.e. add the "-g -pg" options to the 
> compile- and
> link-flags) and run it through your test. This generates a "gmon.out"
> file which you can run through gprof like "gprof fping gmon.out" and
> it will tell you how much time is spent in various parts of the code.
> "gprof -l ..." will do it on a line-by-line basis.
> 
> One thing I learnt from profiling the Hobbit code is that it is very
> easy to store things in arrays or linked lists, but it is also very
> expensive to search through such lists. So I wonder if fping might be
> storing the IP-adresses it pings in an array, and scanning 
> through that
> array every time it receives a reply.
> 
> I'll have a look at it sometime.
> 
> 
> Regards,
> Henrik
> 
> 
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