you are doing a sum and its quite possible. (atleast for the functions you
listed)
Try counting the number of times each function is called in your D script.
Check how many times g_type_check_instance-is_a() called just when you pass
the mouse over the gcalctool.
I got morethan 500 times calls to the above function for about a sec of
mouse over the gcalctool :-)
~Sriram
On Nov 14, 2007 10:32 PM, sham pavman <shampavman.cg at gmail.com> wrote:
> Hi,
>
> I am new to dtrace and so was just trying it out on the "calculator"
> application , and no sooner did I start than I ran into some strange
> scenarios
>
> I had coded to find the time spent in each functions and it showed me
> some abnormal timings..
> Here is the procedure i followed.
>
> **********************************************************************
>
> 1.Started the calculator application
> 2.obtained the id.
> #pgrep gcalctool
> 3.Wrote the dscript as follows using the vi editor
>
> pid$1:::entry
> {
> ts=timestamp;
> }
>
> pid$1:::return /ts/
> {
> @[probefunc]=sum(timestamp -ts);
> }
>
> 4. dtrace -s (name of the file.d) (pid)
> name of the file and pid were filled in accordingly .
>
> 5.This is the output I got.(The last 7 functions only)
>
> mutex_lock 1091011640
> lookup_type_node_I 1472834888
> type_node_conforms_to_U 1717598564
> _pollsys 2155497424
> _pollsys 2157975764
> poll 2159596918
> g_type_check_instance-is_a 2300007485
>
> **********************************************************************
>
> Now from what i understand , the value of time spent is in nano
> seconds, even then the value of these functions exceeds 1.5secs on
> average (it obviously did not take that much time for me to see the
> result of my calculation) .
>
> I wanted to know if my understanding of the logic was wrong or have I
> found myself a couple of bugs :-)..
> Am using b-72.
>
> Thanking you
> Shampavman
> (Campus ambassador)
> (JSSATE)
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