[pups] Strange problems on an uPDP 11/53+
Martijn van Buul
pino at dohd.org
Tue Feb 6 17:39:28 AEST 2001
Steven M. Schultz wrote:
> Hi -
> > From: Martijn van Buul <pino at dohd.org>
> > After 52 days, my uPDP 11/53+ has suddenly been acting rather strange.
> > /usr/include got 'replaced' by /usr/new, to be precise. At the time,
Well, strange things are afoot indeed. About the same time, 1 machine
crashed (A DEC Alpha running OpenBSD), 2 started acting very strangely,
and had to be rebooted (My PDP, and a Wintel box running Windows 2000),
and a 4th machine (A Wintel box running Minix-VMD) suddenly had some
problems reading his harddisk and using its network (but recovered). The
strange thing is that these machines aren't related in any way but one:
they're standing quite near to eachother. Do I hear EMC somewhere?
> > Any hints?
> How much memory is on the system now after the reboot.
1.5 MB. 798 Kilowords.
> The only thing that pops into mind is that the system is running
> without enough memory. If part of the memory on the system dropped
> out earlier that would (possibly) explain the strange behaviour was
> seen. Rebooting/reseting the system would cause the system to
> recount memory.
Well, the machine had 1.5 MB before it crashed.. It's doubtlessly some
memory fault, but it *seems* to be a temporal one.
> "sysctl hw" will give several lines of output - the two you'd be
> interested in are
> hw.physmem = 2097152
hw.physmem = 1572864
> hw.usermem = 415744
hw.usermem = 313472
> 'physmem' is the amount of memory physically present and 'usermem' is
> the amount current free and available for user programs.
Should be enough. 'cc' works without problems - only my ps with debug
info seems to be affected; it might not be a memory issue, but a "ps can't
determine the right amount of processes"-issue..
I've checked it, and this seems to be the case. Ps thinks that there are
0 processes running, and does a
outargs = (struct psout *)calloc(nproc, sizeof(struct psout));
on that. With 'nproc' being 0, this returns a NULL pointer, but doesn't
mean that the process is out of memory.
Having no ps is very annoying; finding back those 4 children spawned
by a httpd can be a nuisance then. pstat -p works, but it isn't comfortable:)
> "pstat -s" will give a swap space usage summary.
15/59 swapmap entries
910 kbytes swap used, 6263 kbytes free
Martijn van Buul - Pino at dohd.org - http://www.stack.nl/~martijnb/
Geek code: G-- - Visit OuterSpace: mud.stack.nl 3333
Kees J. Bot: The sum of CPU power and user brain power is a constant.
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