From: utzoo!decvax!microsof!fluke!norm
Newsgroups: net.unix-wizards
Title: Help with multplexed file limit
Article-I.D.: fluke.863
Posted: Mon Apr 18 20:11:51 1983
Received: Fri Apr 22 21:47:21 1983


Has anyone successfully increased the number of multiplexed files which can
be simultaneously opened under 4.1bsd?  A large number of users at our site 
have adopted Gosling's emacs as their editor of choice, and its maintainer 
has enabled the subprocess option using multiplexed files.  Needless to say,
it doesn't take too long (or too many users) to run out of multiplexed files.

Normally I can handle the flak from our user community, but a recent wrinkle
has been introduced which is a bit sensitive.  Some fool went and wrote a
cutesy little menu package for our Company president using emacs, and its now
expected to work all of the time.  Since this gentleman also has to authorize
most of my equipment purchases, it would be in my best interests to resolve
this issue.  We are planning to convert to 4.1cbsd soon, but if I can even get
a weeks grace with an increased multiplexer count I would be grateful.

The first few lines of our mx.h file look like this:
    /*	mx.h	4.3	81/02/25	*/
    #define	NGROUPS		10	/* number of mpx files permitted at one 					   time */
    #define	NCHANS		20	/* number of channel structures */
    #define	NPORTS		30	/* number of channels to i/o ports */
    #define	CNTLSIZ		10
    #define	NLEVELS		4
    #define	NMSIZE		50	/* max size of mxlstn file name */

I've already tried the [foolishly] obvious of increasing NGROUPS from 10 to 20,
only to have the /tmp filesystem and password file scarfed up within 12 hours
of booting that version of the system.

Thanks in advance for any help or suggestions,

Norm Seethoff
Technical Computing 
John Fluke Mfg. Co., Inc.
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