Below are my tests, though the heap memory can be increased till
the maximum of RAM+VM (my machine is 512MB+2GB), the
maximum size for a single arrary can not be larger than 256MB, I really
need to make array around 1GB, if anyboy can config out
what is wrong with my system. Thanks.
IDL> b=bytarr(1024,1024,255) IDL> help, /mem heap memory used: 267652748, max: 535039712, gets: 395, frees: 148 IDL> b=bytarr(1024,1024,256) % Unable to allocate memory: to make array. % Execution halted at: $MAIN$ IDL> help, /mem heap memory used: 267652748, max: 267652776, gets: 398, frees: 151 IDL> c=bytarr(1024,1024,255) IDL> help, /mem heap memory used: 535039699, max: 535039727, gets: 402, frees: 154 IDL> d=bytarr(1024,1024,255) % Unable to allocate memory: to make array. % Execution halted at: $MAIN$ IDL> help, /mem heap memory used: 535039699, max: 535039727, gets: 405, frees: 157 IDL> d=bytarr(1024,1024,125) IDL> help, /mem heap memory used: 666111805, max: 666111833, gets: 409, frees: 160
Alex Schuster wrote:
renjie wrote:> I tried to make large array, however, in Windows,
> the largest I can made is 256MB, and in Unix is 1 GB,
> it's supposed that the limitation is 2GB, do you have any
> idea about the largest array in IDL?We habe encountered a problem with IDL and NT, where IDL is only able to
allocate 800 MB of memory in one step, even if it can allocate more
memory afterwards. But 256 MB is much too low, presuming there is enough
physical+virtual memory.In Unix, I can allocate more than 1 GB:
--> idl
IDL Version 5.2.1 (sunos sparc). (c) 1999, Research Systems, Inc.
Installation number: 80864-0.
Licensed for use by: MPI ForschungIDL> b=bytarr(1024,1024,1200)
IDL> help, /mem
heap memory used: 1258497902, max: 1258497930, gets: 227,
frees: 89The limit command tells you about the datasize you are allowed to
allocate, maybe this is set too low for you. And maybe there's a similar
setting for Windows?Alex
--
Alex Schuster Wonko@weird.cologne.de PGP Key available
alex@pet.mpin-koeln.mpg.de