I have something that works but the timing is just tooooooo slow. I have a subroutine that communications with remote hosts. It simply passes a one line string as a request and receives back from 1 to 100+ lines of text in return.
I have a couple of suggestions.
Don't try to eyeball and guess where things might be slow. Use the
profiler ( Included with perl 5.8.0, or available on CPAN with older versions.
<http://search.cpan.org/author/ILYAZ/DProf-19990108/DProf.pm>
Also Unix tools like "time" or strace might be helpful.
Mixing buffered I/O (like <> and print()) and serial devices can be a recipe
for disaster. You may need sysread and syswrite. (on the other hand, you
may just need "select((select(CXIBIO), $|++)[0])")
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