On Tue, Jan 12, 2010 at 7:44 PM, Jeph Herrin <[email protected]> wrote:
> *nux uses virtual memory, and so can allocate (and use)
> more memory than RAM.
So can M$-Win.
I did some checking and I'd made a mistake my previous assertion that
I could only allocate 1.3Gb of RAM is on my work computer which only
has 2Gb of physical RAM.
On Tue, Jan 12, 2010 at 8:09 PM, Joachim Landström
<[email protected]> wrote:
> The fantastic history of computing power. . .
>
> From the discussion today, it is clear that 64 bit machines can allocate a
> fair bit more memory to Stata than my claimed 50% of RAM. I guess that may
> have to do with Stata's usage of virtual memory, or are all of you, who have
> tested this today, sure that Stata acually are using all those GB's of
> physical RAM?
On my home computer (not running Stata simultaneously btw ;-) I have
4Gb RAM and after a fresh boot ran the following...
$ free -m
total used free shared buffers cached
Mem: 3961 337 3624 0 7 219
-/+ buffers/cache: 110 3851
Swap: 0 0 0
$ stata
___ ____ ____ ____ ____ (R)
/__ / ____/ / ____/
___/ / /___/ / /___/ 11.0 Copyright 1984-2009
Statistics/Data Analysis StataCorp
4905 Lakeway Drive
College Station, Texas 77845 USA
800-STATA-PC http://www.stata.com
979-696-4600 [email protected]
979-696-4601 (fax)
Single-user Stata perpetual license:
Serial number: 30110528459
Licensed to: Neil Shephard
ScHARR, University of Sheffield
Notes:
1. (-m# option or -set memory-) 10.00 MB allocated to data
2. Command line editing enabled
Note: Your site can add messages to the introduction by editing the file
stata.msg in the directory where Stata is installed.
. !free -m
total used free shared buffers cached
Mem: 3961 341 3620 0 7 222
-/+ buffers/cache: 111 3850
Swap: 0 0 0
. forval x = 1000(10)4000{
2. di "Setting memory to `x'Mb"
3. set mem `x'M
4. }
Setting memory to 1000Mb
(1024000k)
Setting memory to 1010Mb
(1034240k)
.......
Setting memory to 3710Mb
(3799040k)
Setting memory to 3720Mb
memory realloc failed
$ free -m
total used free shared buffers cached
Mem: 3961 342 3619 0 7 224
-/+ buffers/cache: 110 3851
Swap: 0 0 0
So I too can set > 50% of Physical RAM and I've not bothered setting
up swap (as the above line shows, there is none available!), so this
genuinely _is_ using all physical RAM (under *NIX systems you don't
have page-file or whatever its called under M$, but a separate
partition that is used when demands for physical RAM exceed the
capacity of that installed).
My apologies for posting mis-information in the first instance.
Neil
--
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from year to year, and in all circumstances, he rejects hypotheses; he
rather gives his mind to each particular case in the light of his
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