| pixmaps and DEC OpenVMS [message #9954] |
Mon, 22 September 1997 00:00  |
gurman
Messages: 82
Registered: August 1992
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Member |
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Hi -
We're running a few AlphaStations in Digital OpenVMS V7.1 with 24-bit
color cards and IDL 5.0.2 (though the problem was the same under 4.0.1x).
Not too surprisingly, the size of a movie array which can be read into
pixmaps --- i.e., the number of pixmaps of a certain size --- is smaller
in 24-bit color than in 8-bit.
The suprising thing is that on systems with large physical memories
(>= 512 Mbyte), large WSMAX's, large NPAGEDYN and NPAGEVIR, even processes
with quite large working set quotas and extents appear to be limited to a
relatively small number of 1024 x 1024 pixmaps (i.e., ~ 16), while on a
Power Macintosh (Mac OS 8, also IDL 5.0.2) with "only" ~ 270 Mbyte of
memory, I can get up to over 100 1024 x 1024 pixmaps in 24-bit mode
bvefore the application complains about running out of memory --- and I'm
only running in a ~ 100 Mbyte partition. Even OpenVMS systems with 8-bit
color cards and < 400 Mbyte of memory can access more than 3*16 = 48
1024^2 pixmaps, so I'm clearly missing something here.
I don't understand why OpenVMS is having this problem, at least in
part because I don't know how IDL is allocating memory for the pixmaps
under OpenVMS. Anyone with insight into that and/or OpenVMS tuning
parameters who'd like to volunteer a solution/explanation/educated guess?
Thanks,
Joe Gurman
P.S. Please don't bother responding if all you want to do is extoll the
virtues of the unix flavor of the day or Windoze NT or something else over
OpenVMS. We have plenty of other platforms for other purposes, this is the
best one for the realtime applicastions these systems have to deal with.
--
| Joseph B. Gurman / NASA Goddard Space Flight Center / Solar | | Physics Branch / Greenbelt MD 20771 / gurman@gsfc.nasa.gov |
| Civil servants aren't allowed to have opinions while ar work. |
| Therefore, any opinions expressed herein must be someone else's. |
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