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From: John Reynolds <jjreynold@home.com>
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Date: Thu, 3 Aug 2000 23:57:25 -0700 (MST)
To: questions@freebsd.org
Subject: how to tell the amount of SysV shared memory available?
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Hello,

Is there a way to tell how much SysV-ish shared memory can be allocated? One of
the *stat commands?

I grepped through the archives looking for shmget() articles because I'm having
problems running the "buffer" command (/usr/ports/misc/buffer) in conjunction
with backing up onto tape. If I run 'buffer' alone it succeeds but if I try and
allocate more memory with the -m option I get:

root@whale [~]<98># buffer -m 2m -s 54k -u 100 -t -p 75 -B
buffer: couldn't create shared memory segment: Cannot allocate memory

I saw article:

  http://www.FreeBSD.org/cgi/getmsg.cgi?fetch=3414394+3416672+/usr/local/www/db/text/1998/freebsd-questions/19980308.freebsd-questions

mention the SHMMAX parameter in LINT. I looked in RELENG_4's LINT and sure
enough there it is at the bottom. Is this the proper way to increase the amount
of shared memory shmget() can get? i.e. setting SHMMAXPGS to something higher
than the default? I grepped through sysv_shm.c and saw that the default for
this parameter if not given in a kernel config file is 1024. Would doubling it
screw something up?

Thanks,

-Jr

ps: btw: I'm running GNOME+Sawfish and have read in the archives that sawfish
uses lots of shared memory ... maybe untrue, but that could be why I'm "running
low" after making the window manager switch ......

-- 
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John Reynolds         Chandler Capabilities Engineering, CDS, Intel Corporation
jreynold@sedona.ch.intel.com  My opinions are mine, not Intel's. Running
jjreynold@home.com          FreeBSD 4.0-STABLE. FreeBSD: The Power to Serve.
http://members.home.com/jjreynold/  Come join us!!! @ http://www.FreeBSD.org/
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