[Simh] Excessive paging of the real machine running SIMH - VAX

[Richard Davis]

Villy,

 

The issue only occurs on my system when first starting the system, i.e. when
the disks are first mounted, my disks are 1Gb and 2Gb respectively.. 

A stack trace of the executable when the problem occurs shows the following
call trace:

 

sim_process_event

rq_svc

sim_fseek

fsetpos

_fseeki64

_fseeki64_nolock

_flush

_write

 

As mentioned before, the strange value in the _flag member of the stream
causes the _flush routine to do a complete flush of the disk file.

 

I modified the SIMH sim_fopen routine to use the _fsopen call (rather than
fopen) which allowed me to deny all sharing.. the problem still occurs, so
It's nothing to do with sharing!

 

I need to understand the workings of SIMH a bit better, and need to find out
how things are put onto the event queue (the _flag member is already
'corrupted' when the event gets processed in the sim_process_event routine.

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