Note: This FAQ is for users of Stata 9.
As of September 2005, Stata for Irix is no longer available.
Why won't Stata
allow large datasets even when I am using a 64-bit Irix machine?
Kevin S. Turner, StataCorp
When using Stata for Irix 6.5, it is possible to use large datasets that
require use of the 64-bit address space (roughly > 4Gb).
However, under some Irix environments, Stata may not allocate large amounts
even when sufficient memory is available. A typical error message would look
like the following:
. set mem 8000m
op. sys. refuses to provide memory
Before you try the following solution, make sure you have tried all other
solutions. Your System Administrator will be able to assist you in determining
some of these issues.
- Checking to make sure there is enough physical RAM or swap space on the machine.
- Checking to make sure that other users are not simultaneously competing for
limited amounts of memory.
- Checking that no user account limits have been imposed by the System
- Checking that you are running Intercooled Stata and not Small Stata.
If you still cannot allocate enough memory, there is one other solution. It
involves tuning a few system-wide variables that affect memory limitations.
You will need root access for these changes. From the shell, type the
following commands. (Notice that the X represents the number of
bytes you wish to specify. You should use the same value for all the following
system variables, but you can choose any arbitrary value. For example,
4294967296 will allow 4.2Gb).
systune rlimit_rss_cur X
systune rlimit_rss_max X
systune rlimit_vmem_cur X
systune rlimit_vmem_max X
systune rlimit_data_cur X
systune rlimit_data_max X
systune shmmax X
After specifying these variables, you should reboot the machine. When the
system restarts, you should be able to allocate up to the new limits you have