dnlcsnoop.d - snoop DNLC activity. Uses DTrace. dnlcsnoop.d The DNLC is the Directory Name Lookup Cache. Filename lookups often return a hit from here, before needing to traverse the regular file system cache or go to disk. Since this uses DTrace, only the root user or users with the dtrace_kernel privilege can run this command. Solaris unstable - this script uses fbt provider probes which may change for future updates of the OS, invalidating this script. Please read Docs/Notes/ALLfbt_notes.txt for further details about these fbt scripts.

Sample until Ctrl-C is hit then print report, # dnlcsnoop.d

PID process ID

CMD command name

TIME Elapsed time for lookup, us

HIT DNLC hit Y/N

PATH Path for DNLC lookup

See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output. dnlcsnoop.d will sample until Ctrl-C is hit. Brendan Gregg [Sydney, Australia] dtrace(1M)