Hi!
Stephen added the module "nsconfigw" into the modules
section, based on my example from RFE.
He did quite a lot of work there lately to clean it up,
debug and write some test cases.
Good Work, Stephen!
I changed the way how parameters are handled to avoid
excessive allocations and conversions where possible
(this can still be improved). I compared the ns_config
(NS built-in read-only config) speed with the new module:
lexxsrv:nscp 2> time {ns_config -bool ns/parameters logdebug} 1000
3.368 microseconds per iteration
lexxsrv:nscp 4> time {ns_getconfig -bool ns/parameters logdebug} 1000
2.331 microseconds per iteration
Well, 1 microsec is not much but in this case this is 30% (faster).
Strings is similar, yet not so large difference (as expected):
lexxsrv:nscp 16> time {ns_config ns/parameters tcllibrary} 1000
3.163 microseconds per iteration
lexxsrv:nscp 18> time {ns_getconfig ns/parameters tcllibrary} 1000
2.966 microseconds per iteration
The config store now has typed-params so we avoid conversions
similarily to Tcl objects. Per-definition, the contention on
readers is minimal per-design: just one reader and one writer
may contend for the same mutex. Multiple readers will never
contend, except on the very first request for a param that
is not privately cached. This all comes with a price of more
memory usage. Not really much, but still. OTOH, you get true
read/write config which is reasonably (very!) fast so you can
even put calls to it in tight loops.
I think this is very good now. It needs adding WideInt type
and some way of making the conig persistent. Perhaps some
other param qualifiers (readonly, readwrite...)
Cheers
Zoran
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