I don't have very much by way of help for you because honestly I
don't think there's enough information here for more than
generalities, but ..
1) With 1 CPU (NSOperation not used), I get 50% of CPU-time devoted to
auto_collection_thread which I presume means Garbage Collection. Is
this
normal? It seems excessive.
... you know you can manually manage resources, right? Forgive me
for not knowing the specifics (I haven't delved enough into GC to
speak authoritatively on the matter), I think if you select GC
optional (versus required) for your target, then disable garbage
collection and manually manage your operations' resources, you can do
what you need to do and immediately clean up on exit. That's surely
faster than letting GC traipse about your object graph, looking for
low-hanging fruit.
That's *one* way to squeeze some more performance from your Cocoa
version, I would imagine.
With regard to Instruments, I encourage you to get hold of the "new
shiny" (10.6) if you haven't got it already and see if that works
better for your purposes. A hint: it probably will. ;-)
--
I.S.
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