Very Computer

I check the limits (/etc/security/limits) and increase the datasize to the available
virtual size.  Still, the limit sets to 257532 kbytes.

IBM informs me that this is a fixed size in then kernel and to use shared memory.
This is not an acceptable solution as too much Fortran code will need to be modified.

Does AIX 3.2 address this boundary problem?  Is there any other way around this other than through the use of shared memory?  Could this variable simply be changed in the kernel without effecting page tables, etc?

Thanks...Bill

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* UUCP:     princeton!soil!bill      Princeton University                      *

* Phone:    609.258.4612             E114 E-Quad                               *
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Frederick Staats

Santa Cruz Institute for Particle Physics
University of California at Santa Cruz

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Under AIX 3.2, there is a new address space model enabling larger data spaces to be allocated to an application.  The o_maxdata field in the a.out header gets set to the amount of memory needed.  This can be set with the -b option to the linker.

For example, to use 8 256M segments (the maximum) the command to use is:
    cc -o program program.o -bmaxdata:0x80000000
(The number 0x80000000 is the number of bytes, in hexadecimal, =2Gbytes of addressable space)

Under AIX 3.1 a shared memory model must be used.  I have some info from IBM on how
to accomplish this if anyone is interested.

-Bill

--
********************************************************************************

* UUCP:     princeton!soil!bill      Princeton University                      *

* Phone:    609.258.4612             E114 E-Quad                               *
* FAX:      609.258.1270             Princeton, NJ 08544                       *
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