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Using more than 2(00) GB of memory on AIX

The executables in GAMS releases before 24.2.3 can allocate at most 2GB of memory. If, for example, the GAMS execution system tries to allocate more than this limit of 2GB, you will see a message like

*** Out of Memory in New or GetMem.
*** Out of Memory while executing line 1742
*** HeapLimit = 1E20 HeapSize = 2145.2

It is possible to extend this limit by setting the environment variable LDR_CNTRL. For example, to increase the limit to 20GB, one would set (on bash):

export LDR_CNTRL=MAXDATA=0x800000000

Alternatively, it is possible to edit the information on the limit in the GAMS executable via the ldedit tool:

ldedit -b maxdata:0x800000000 gamscmex.out

With GAMS 24.2.3, the limit in the executable in the GAMS system has been increased to 200GB. If more than these 200GB are required the above methods can be applied.

platform/using_more_than_2_00_gb_of_memory_on_aix.txt · Last modified: 2014/05/20 15:40 by support