Re: optimization and C arrays (was Re: Return pointer to array: notpossible?)

[Marcus G. Daniels]

>>>>> "PJ" == Paul E Johnson <address@hidden> writes:

PJ> Is it not correct that when you have a C array,
PJ> and you grab item 5 with array[4], it uses less steps than
PJ> [SomeArray atOffset:4] to retrieve the same thing?

You can call getMemberBlock on an Array to get an address you can
repeatedly dereference into. 

TB> 3) Avoid calling unnecessary operating system routines and using
TB> unnecessary I/O (especially disk I/O). 

PJ> Can you give me an idea of how I can write periodic output into memory
PJ> and then save it at the end of the run, rather using fprintf at every
PJ> timestep?  

printf is already buffered, so it should not be a massive source of
system calls.  setvbuf can be used to increase buffering, if necessary.


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