Rafael Vanoni wrote:
On Thu, Dec 3, 2009 at 10:07 PM, Kevin Fitch <kfitc...@gmail.com> wrote:
I have a situation that I would like to debug with dtrace, but I am
not sure
how.
I have a process that kicks off, runs for a few seconds (perhaps
milliseconds) then goes away. And this happens very frequently, think
old-school CGI based web app. And just for a little more fun, this app
makes
extensive use of shared libraries.
How can I use dtrace? I don't have an existing process to attach the pid
provider.
I could use the pid$target stuff, but that would linvolve modifying the
system to kick off the processes with dtrace -c. This would be
possible, but
painful. And, it would mean I would have to use a post-processing step
should I want/need to aggregate results from multiple processes.
Is this a production system? If not, you could predicate on firings of
cfork:create to catch the process you wanna look at.
Sorry, make that proc:::create.
I'm not sure how much this would impact a production system, I guess it
depends on your workload. But you might be able to get away with it.
Rafael
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