I have a question about virtual memory tunables on Tru64. After
some digging into the Tru64 online doc, I still couldn't find an answer
which I liked. So I thought I'd see if any of you could help.
Our product uses lots of memory, so we suggest in the manual to
increase the amount of per-process virtual memory (among other things.)
On Tru64 4.0F we listed the command to get this kernel tunable as:
/sbin/sysconfig -q vm vm_maxvas
The manual for Tru64 4.0F lists this tunable as:
This vm subsystem attribute specifies the maximum amount of valid
virtual address space for a process (that is, the sum of all the valid
pages). The default is 128000 pages (1 GB).
This sounds like exactly what we wanted. The 5.1 manual on
compaq's web site doesn't list this parameter (nor does using
/sbin/sysconfig.) Some google groups searching showed someone saying
that this has been deprecated for a long time, and that
per_proc_address_space and max_per_proc_address_space were the suggested
alternative. Maybe I'm showing my lack of sys-admin lingo knowledge but
the definitions of these two don't seem to be *exactly* what I want.
Compaq's manuals list them as:
max_per_proc_address_space
Maximum amount, in bytes, of user process address space.
per_proc_address_space
The maximum amount, in bytes, of user process address space.
I want to increase the maximum amount of virtual memory any given
process can use. I assume the above setting effects both physical and
virtual memory. (I believe our manual also suggests increasing the max
physical memory we can address.) Is this level of control not needed on
Tru64 5.1? Does any one know how to do it?
If I'm showing a lack of understanding (along with knowledge)
please correct that too!
Thanks for any and all help,
Eric
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