RE: Penalty for using globals?
SR.Williamson wrote:
> What kind of penalty can I expect from using a lot of global variables
> or sequences? Speed? Memory use?
>
>
>
if you define a variable inside a function , it exists while that
function is running. it is deleted from the programs 'address' space
when that function is finished. you would probably get a penalty in time
if you are frequently creating and destroying the same variable. if you
define it outside all your functions , it uses some address space while
your program runs but is available to any of the functions that need it
at any time.
thats where the programmer has to make compromised performance
decisions. each program(problem) has it own factors to determine the
best direction to go. just like having to decide to hold data in memory
or on disk while program is running. not everyone has the same amount of
memory in their system so your program might run fine on your system but
crash on their system if you make everything stay in memory.
hope this helps somewhat.
later
rudy
rltoews at ilos.net
lotterywars
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