| Maximum memory under Windows NT [message #14587] |
Fri, 12 March 1999 00:00  |
rivers
Messages: 228
Registered: March 1991
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Senior Member |
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I have a question about maximum memory allocation under Windows NT. I have a
high-end Windows NT workstation configured with
- Dual 450 MHz Pentium CPUs
- 1GB of RAM
- Windows NT Workstation 4.0, SP3
I have allocated 2GB of paging file space for virtual memory. The Task
Manager/Performance screen shows a Commit Charge Limit of about 3200000, which
makes sense, since it is the sum of the paging file and the physical memory.
However, when I try to allocate large arrays in IDL I find that it fails at
a = bytarr(1024, 1024, 1024)
i.e. it cannot allocate a 1 GB array, but it succeeds at
a = bytarr(1024, 1024, 1000)
i.e. just less than 1 GB.
When it fails I see that the Task Manager/Performance/Commit Charge Total is
what I expect, and that it is not close to the Commit Charge Limit by a factor
of 3.
Does anyone know what the maximum memory available to application programs is
under Windows NT, and if there is a way to increase it? I realize that
Windows NT is a 32-bit operating system, so the maximum can be no more than 4
GB, but I was not aware that it was limited to 1 GB, if indeed it is.
____________________________________________________________
Mark Rivers (773) 702-2279 (office)
CARS (773) 702-9951 (secretary)
Univ. of Chicago (773) 702-5454 (FAX)
5640 S. Ellis Ave.
Chicago, IL 60637 rivers@cars.uchicago.edu (e-mail)
or:
Argonne National Laboratory (630) 252-0422 (office)
Building 434A (630) 252-0405 (lab)
9700 South Cass Avenue (630) 252-1713 (beamline)
Argonne, IL 60439 (630) 252-0443 (FAX)
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