Re: Q:prg slowing down-why?

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Re: Q:prg slowing down-why?

Subject: Re: Q:prg slowing down-why?
Newsgroups: bit.listserv.calc-ti
References: <32135AC4.1F3F@hrz.tu-chemnitz.de>
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CalFolds (calfolds@aol.com) wrote:
:   There are a few resonse why your calc slows down.  1 : The longer  a
: program is the slower it gets because the processor has more instructions
: then it can handle  so the program slows down waiting for processor speed
: sence the OS takes up so much processor time the only way around this is
: to use asmbly (Wich does'nt all way help!) or optimise your code to be
: smaller which will greatly increase the speed of you prog. 2 : The lore
: memory you use the slower it gets.  same thing with a PC or Mac.  If you
: have 16 megs of mem youe system would be much faster than say one with 8
: or 4 megs. and sence the calc uses the same memory for storage and the
: execuction it'll slow down untill you run out of mem where the calc will
: slow down to unbearabl speeds. 3 : As the bateries grow weaker there will
: be less power going to the processor and the processor will slow down
: because of a lack of power.


:   Hope that helped
:                                                                   Cal
: P.S. I'm pretty sure this is correct


Mmm....


1) The longer the program, the more time CPU uses to find sub-routines if
it searces them from the beginning of program. To minimize the speed loss
caused by this, place all frequently called sub-routines to beginning
of program. This hint I've read as a hint of C64 BASIC programming.


2) Speed loss of Mac or PC, when there's no free RAM left, is caused by
use of virtual memory. Writing/reading to/from disk is slower than
to/from RAM. TI doesn't have virtual memory, so, amount of free memory
shouldn't affect to calc's speed. However, as I tested my TI-85 with my
own speed test program, speed with only that basic test program in memory
was, say, 1.00, with memory almost full, about 2 kB left, speed was about
0.80. Slowing down has also been noticed when calculating
time-consuming calculations. Speed loss could be explained, if one knew
TI's BASIC interpreter's way of functioning down to the smallest detail.


3) TI's CPU's clock generator is a RC (resistor-capacitor) one, that
varies its speed while operating voltage varies. CPU's operating voltage
itself doesn't effect on speed.


-A


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