Re: lexical analyzer for .db?

[Eric Norum <norume@aps.anl.gov>]

On Nov 2, 2007, at 8:30 AM, Ned Arnold wrote:

> You may be able to eliminate the fanout records by careful design  
> of forward links and/or input link flags (PP, CP, etc).
>
> For example, if the input record's forward link field referenced  
> the calc record and the calc record's forward link field referenced  
> the calcout record, all would process each time the input record  
> processed ... without a fanout.

Don't take this technique to extremes, though.  I recall helping  
Steve Shoaf diagnose problems with his database for a video switching  
system.  The database contained 128 records FLNK'd together.  This  
caused very weird IOC faults that we finally realized were caused by  
stack overflow of the task processing the records -- 128 recursive  
calls to the record processing routine forced the task stack pointer  
past the end of the stack space.
--
Eric Norum <norume@aps.anl.gov>
Advanced Photon Source
Argonne National Laboratory
(630) 252-4793