[PD-dev] Fwd: Fwd: Fwd: Connecting up an SQL Database to PD

[Mathieu Bouchard]

On Tue, 13 Nov 2007, Jamie Bullock wrote:
>> I just wonder about the extra overhead involved in dealing with tagged
>> lists of data.
> I just did a benchmark, and for a billion iterations, with a compiler
> optimisation level of O2, both a loop with the SETFLOAT statement, and
> an empty loop completed in the order of 1-2 microseconds!

a really good optimiser can make an *infinite* loop run in that long! ;)

seriously, with optimisers it's becoming harder to make some measurements. 
C has a type modifier called "volatile" while forces true read/write on a 
variable, which can be useful when handling signals, threads, mmaped 
hardware, and... benchmarks.

Using that keyword, you can pretend that the compiler doesn't already know 
that it doesn't need to change the contents of the atom because you always 
write the same thing over and over and never use those values. Thus you 
can simulate a real situation but still isolate several components when 
you measure them.

Anyway... in the context of remote procedure calls and massive disk 
accesses, SETFLOAT should be the least of your concerns.

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| Mathieu Bouchard - tél:+1.514.383.3801, Montréal QC Canada