benchmarks? recommendations for app developers?

[Krishna N. Ramachandran]

Hi,
       I am interested in running a few benchmark tests to gauge the
performance of libc_r, lkse, and libthr under FreeBSD 5.1. Specifically, I
am interested in benchmarking thread management and synchronization
management in the thread libraries. Are there any freely available tools
that can do this for me? Also, would you know of some recorded performance
comparisons out there that I can look up? 

      Also, I wonder if there are any recommendations as to which library
to use for a particular class of application? For instance, if an app
creates only 5-10 threads, would it be better to use libThr over KSE? If
an app creates 1000s of threads, would it be best to use KSE? I know this
question isn't very concrete and has probably been covered many times in
bits-and-pieces on the mailing list, but it would certainly help app-developers if a
design ideology/principle doc is put up somewhere.

Thank you in advance,
Krishna 

p.s. Sorry, if this email turns out to be a duplicate. The previous one i
sent has still not made it to the group.