Buffers or POs?

Buffers or POs?

[Tom]

I have the problem that the OS provides services for buffers which are
similar to Protected Objects. What is better to use in terms of
performance the provided OS services or a self-implemented buffer
utilising Protected Objects.

Re: Buffers or POs?

[Jeffrey R. Carter]

Tom wrote:

> I have the problem that the OS provides services for buffers which are
> similar to Protected Objects. What is better to use in terms of
> performance the provided OS services or a self-implemented buffer
> utilising Protected Objects.

A protected buffer, such as PragmARC.Queue_[Un]Bounded, will be much more 
portable. (http://home.earthlink.net/~jrcarter010/pragmarc.htm)

As for performance, you should go through the same process for any performance 
related feature:

What are the timing requirements?
Does the use of the portable solution meet those requirements?
If so, use the portable solution.
If not, does the use of the OS-dependent solution meet those requirements?
If so, decide if you want to tie your system to the platform, or find another 
way to meet your requirements.
If not, the buffer is not the problem. Find and fix the problem, and repeat.

-- 
Jeff Carter
"I wave my private parts at your aunties."
Monty Python & the Holy Grail
13

Re: Buffers or POs?

[Steve]

"Tom" <almut.maurer@planet-interkom.de> wrote in message 
news:1129573392.886254.115610@g44g2000cwa.googlegroups.com...
>I have the problem that the OS provides services for buffers which are
> similar to Protected Objects. What is better to use in terms of
> performance the provided OS services or a self-implemented buffer
> utilising Protected Objects.
>

There is no absolute way to answer this question.

Ideally a compiler targeting such an OS will map protected objects to the 
most efficient implementation on that system.  So... if the OS services are 
most efficient, the compiler will make use of them.

In practice compilers tend to use techniques that permit re-use across 
platforms, so the efficiency on each individual target OS/archtecture may 
not be optimal.

The only real way to know is to run tests.

Steve
(The Duck)