Arne Mastekaasa <[email protected]> asks:
"Under Windows XP 32 bit I am able to allocate 900m of memory under Stata 9,
but only 600m under Stata 10 (-set memory- command). Anybody else experienced
this? Can anything be done? (other than changing to 64 bit system)."
Arne may find the following FAQ providing useful information.
http://www.stata.com/support/faqs/win/winmemory.html
Quoting from the above FAQ,
"When a typical application loads, there are usually several
libraries (or DLLs) that are loaded as well. These libraries are
usually loaded into the 2.1-GB space on the upper end, but not in
any deterministic order. Microsoft has assured us that there is no
way to prevent these libraries from loading into arbitrary
addresses, thus fragmenting the available space. When Stata tries
to load a dataset, it requests from Windows the largest contiguous
space in the 2.1-GB range. Depending on where Windows loaded the
initial libraries, this may be 1.8 GB, 1.3 GB, or even less. You
may be surprised to find that a 1.4-GB dataset loaded fine one time
but failed to load later. This is simply an unfortunate side effect
of Windows memory management."
Since Stata 10 uses more Microsoft libraries than Stata 9, the virtual
memory space in Stata 10 is more fragmented than in Stata 9. Hence
less memory is available.
If Arne often needs more than 1GB memory to work with large dataset, a
64-bit Stata on a 64-bit operating system is the solution.
On the other hand, if Arne only needs around 900MB memory, he may try
to apply the Microsoft hotfix in the FAQ first. If this does not fix
the problem, he may consider moving from 32-bit XP to 32-bit Vista
since the virtual memory management in Vista is much better than in
XP.
--
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Hua Peng, Ph.D.
Senior Software Engineer VOICE: 1-979-696-4600
StataCorp LP TOLL : 1-800-782-8272
4905 Lakeway Drive FAX : 1-979-696-4601
College Station, TX 77845 EMAIL: [email protected]
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