Re: Query about monitor (passive) task optimization

[ddciiny!jls@uunet.uu.net (Jonathan Schilling)]

In article <1993Aug2.181750.19343@seas.gwu.edu> mfeldman@seas.gwu.edu (Michael 
Feldman) writes:
>
> [discussion of compiler optimization and performance traps in Ada]
>
>And this will ALWAYS be true of high-level languages and optimization.
>If you've gotta control every bit, write it in assembler. If you're
>writing it in a HLL, these things will bite you now and then. Yep.
>That's life.

Yes.  It should be pointed out that Ada is in no way unique in this area.
C++ has a number of tricky areas relating to real-time performance (that
incidentally programmers coming from Ada will be better prepared to deal
with than those coming from C).  Even in C the user has to worry about
whether the standard library functions are reentrant, whether they have
hidden extrefs that aren't appropriate for real-time, whether the malloc
algorithm behaves reasonably, etc.  [The July 1993 issue of "Embedded
Systems Programming" has two long articles on these subjects.]  Then if
the programmer is using a rl-time kernel product to provide concurrency
support, there are the performance characteristics of that product to
learn, and occasionally get caught by.

-- 
Jonathan Schilling
DDC-I, Inc.
uunet!ddciiny!jls