regarding core file generation in solaris:pls suggest some tips

Hi,

I have one application "app.exe", and it has many threads, that will
be running.
From the top command, I could see that the main process "app.exe", is
taking
a lot of CPU usage, and I am not sure which thread is causing this
problem, since
it is not showing the the thread that is hogging the cpu..

After some time, I could see my "app.exe" is crashing.., and I am not
able to see why it is crashed. I cannt start the "app.exe" with gdb as
I have other dependencies.

Also, when the app crashes, there is no core file, and I could see
that core dump settings are proper. Then manually I tried to generate
the core file using " gcore <pid of app.exe>
and, then use the core file to see with gdb.

However, since I am not aware where the app will crash, so, I could
not generate core at the moment of crashing..

Is there any way to :

1) see which thread is taking what percentage of cpu ?
2) core file when it crashes

thanks.
.

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