12 Oct
2000
12 Oct
'00
2:01 p.m.
> VMS isn't a memory pig. Alpha however was
aimed at big apps and isn't
> as byte efficient as VAX so it tends to consume 2x-4x the ram. The
I think you know what I mean :^) The system in
question is an Alpha,
and on
See the comment I left in? Yes, I do know what you mean.
Alpha's OpenVMS is a memory pig! A quick (SHO
CLUS) shows that my 24MB
VAXstation 4000/VLC is sitting at 60% memory usage, the AlphaStation
500/333
with 96MB that doesn't have DECwindows loaded on
the system is sitting
at
69%, unfortunatly I don't have either of the
workstations with 112MB up
at
the moment as but running DECwindows I believe
they'll be at about 80%,
IIRC. Of course my main system is only at 20% :^)
An Alpha with 96mb is running faster than the VAX however with 24mb
so you get what you pay for. However in the time frame when they were
both current that Alpha would likely have had 128mb minimum and likely
more and the vax would have been big at 32mb.
It's the difference between the byte oriented VAX and the Word orieneted
Alpha.
I understand why OpenVMS on an Alpha uses so much
memory as opposed to
on a
VAX, however, the fact remains, it's a memory hog,
and like I said based
on
my very limited Tru64 experience it seems even worse on
the exact same
hardware.
Actually any os on Alpha will be bigger by 4x, it's the instruction
granularity
mostly and also the Alpha is actally less CISC than VAX. The payback is
the 64bit addressing and math.
Allison