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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