*BSD News Article 89568


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Newsgroups: comp.unix.bsd.freebsd.misc
Subject: I need MORE than 120 ptys........please help
Message-ID: <3309E9A0.938@sticky.usu.edu>
From: Hal Lynch <hal@sticky.usu.edu>
Date: Tue, 18 Feb 1997 11:40:48 -0600
Reply-To: hal@sticky.usu.edu
Organization: Utah State University
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I have a Compaq Deskpro 5100 with a 100mhz Pentium, 81920K bytes
of memory and Free BSD 2.1.5 running a gateway application for our
campus library.  The application is written in c and uses tcl and tk.
Users connect through our campus network.  The gateway program
gives access to our local library, other state libraries, selected
libraries in other states, and provides other services via the
internet.  Telnet and tn3270 are used extensively.

Here is the problem:
	At something over 120 ptys in use users start getting a message
	saying there are no more ptys available.  I have not seen this
	message personally because the number of ptys in use at any one
	time varies widely.  By the time an event is reported to me the
	situation has changed.  Ie: it comes and goes.

Here is what I know:
	The manual that came with my cdrom says that 64 is the upper
	limit on ptys.

	I have seen over 120 ptys in use at one time on my machine but
	never more than about 122.

	I have 192 ptys defined in the configuration file.

	There are 192 ptys defined in /dev.

Here is what I suspect:
	Could the limit really be 128 ptys?

Here is what I need:
	More ptys.

	Is there anything in freeBSD I can tweak to get at least
	192 or preferably 256 ptys.

More info:
	This application was ported over from a DEC Alpha box.

	With 35 to 40 users and approximately 275 processes top says
	the processor is about 75% idle.

	At about 250 processes noticable swapping take place although
	response time is excellent. (sub 1 sec)

	If I can't get over this pty problem I will have to find
	another platform and I REALLY don't want to do that.

Please help me find more ptys.


hal