problem in running scirpt disktop.stp

[Mark Wielaard]

On Sat, Mar 24, 2012 at 01:50:27PM +0800, ch huang wrote:
> # stap disktop.stp -o ~/myfile
> 
> WARNING: cannot find module sunrpc debuginfo: No DWARF information found
> WARNING: cannot find module sunrpc debuginfo: No DWARF information found
> WARNING: cannot find module sunrpc debuginfo: No DWARF information found
> WARNING: cannot find module nfs debuginfo: No DWARF information found
> WARNING: cannot find module nfs debuginfo: No DWARF information found
> ERROR: probe overhead exceeded threshold
> WARNING: Number of errors: 1, skipped probes: 0
> Warning: /usr/bin/staprun exited with status: 1
> Pass 5: run failed.  Try again with another '--vp 00001' option.

Run stap with -t to see which particular probe spends how much time.
man stap

   -t     Collect timing information on the number of times probe executes
          and average amount of time spent in each probe-point. Also shows
          the derivation for each probe-point.

If you want to allow the overload see:
http://sourceware.org/systemtap/wiki/TipExhaustedResourceErrors

In this particular case you could try disabling the overload heuristic
with -DSTP_NO_OVERLOAD.

Cheers,

Mark