20040914: Minor issue with LDM 6.*

Steven,

> To: address@hidden
> From: "Steven Danz" <address@hidden>
> Subject: Minor issue with LDM 6.*
> Organization: Aviation Weather Center
> Keywords: 200409142045.i8EKjBnJ016694 LDM-6 ldmadmin pqact.conf

The above message contained the following:

> 
> Just been updating some 5 installs to 6 and noticed a small issue.
> If you have an 'empty' pqact.conf (just a bunch of comments, or an
> empty file), 'ldmadmin start' will not start ldmd as it claims that
> there is an 'Error in pattern file "..../pqact.conf"'.
...

On second thought, this is a feature rather than a bug.  If an empty
pqact.conf file were allowed, then the LDM system would be less
efficient because the pqact(1) process would still be wakened by the
operating system for every data-product that was inserted into the
product-queue (even though nothing would be done with any product).
This kind of "heavy" context switching uses a lot of system resources.
It's much better to disallow such a configuration-file and to,
consequently, force the user to comment-out the (now unneeded) "EXEC
pqact" entry in the LDM's configuration-file.

Regards,
Steve Emmerson