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AW: AW: AW: AW: st: Increasing Stata Memory


From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   AW: AW: AW: AW: st: Increasing Stata Memory
Date   Tue, 12 Jan 2010 20:02:54 +0100

<> 


I tried various things today at the upper bound of the mem that Stata is
willing to allocate for me, and the computer slows down so drastically in
the last, say 15%, as to render them useless. Still, much more than half of
my installed RAM was usefully accessible. 64bit is worth investing in, no
doubt...



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Jeph Herrin
Gesendet: Dienstag, 12. Januar 2010 19:57
An: [email protected]
Betreff: Re: AW: AW: AW: st: Increasing Stata Memory

Agree. I have a machine with 16gb RAM running 64bit XP,
and have allocated 15gb to Stata.



Martin Weiss wrote:
> <> 
> 
> " No operating system allows
> programs to use more than 50 percent of RAM. Since 32-bit systems only can
> use a maximum of 4 GB RAM, it follows that a 32-bit system cannot allocate
> more than 2 GB of RAM. 64-bit systems can use, from what I have heard, an
> unlimited amount of RAM but they will still not allocate more than maximum
> 50 percent of RAM to other programs."
> 
> 
> I am not sure this is true. I have 8G of RAM on 64bit Vista, and _can_
> allocate 6G w/o problems....
> 
> 
> 
> HTH
> Martin
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: [email protected]
> [mailto:[email protected]] Im Auftrag von Joachim
> Landström
> Gesendet: Dienstag, 12. Januar 2010 14:09
> An: [email protected]
> Betreff: RE: AW: AW: st: Increasing Stata Memory
> 
> Neil,
>>>From what I have read on the subject, my understanding is as follows. 
> 
> Both 32-bit and 64-bit systems run under the same sort of memory
limitation
> independently of operating system (Linux/Win). No operating system allows
> programs to use more than 50 percent of RAM. Since 32-bit systems only can
> use a maximum of 4 GB RAM, it follows that a 32-bit system cannot allocate
> more than 2 GB of RAM. 64-bit systems can use, from what I have heard, an
> unlimited amount of RAM but they will still not allocate more than maximum
> 50 percent of RAM to other programs. 
> 
> Thus, in your case, your system will not allocate more than maximum 2GB
RAM
> to programs despite your 64-bit system. But if you increase the amount of
> physical RAM to 8GB you should be able to allocate up to 4 GB of RAM to
> programs and consequently set the Stata memory to much higher than 1.3 GB.
> 
> /Joachim
> 
> 
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Neil Shephard
> Sent: Tuesday, January 12, 2010 11:19 AM
> To: [email protected]
> Subject: Re: AW: AW: st: Increasing Stata Memory
> 
> I noticed the other day that on my GNU/Linux system with 4Gb of RAM
> and support enabled in the kernel for such an amount of RAM that under
> my 64-bit installation I'm unable to allocate more than 1.3Gb...
> 
> . about
> 
> Stata/IC 11.0 for Unix (Linux 64-bit x86-64)
> Born 21 Oct 2009
> Copyright (C) 1985-2009
> 
> <--- snip --->
> 
> . forval x = 1000(10)2000{
>   2. di "Trying to set memory to `x' Mb"
>   3. set mem `x'M
>   4. }
> Trying to set memory to 1000 Mb
> (1024000k)
> Trying to set memory to 1010 Mb
> (1034240k)
> Trying to set memory to 1020 Mb
> (1044480k)
> Trying to set memory to 1030 Mb
> (1054720k)
> Trying to set memory to 1040 Mb
> (1064960k)
> Trying to set memory to 1050 Mb
> (1075200k)
> Trying to set memory to 1060 Mb
> (1085440k)
> Trying to set memory to 1070 Mb
> (1095680k)
> Trying to set memory to 1080 Mb
> (1105920k)
> Trying to set memory to 1090 Mb
> (1116160k)
> Trying to set memory to 1100 Mb
> (1126400k)
> Trying to set memory to 1110 Mb
> (1136640k)
> Trying to set memory to 1120 Mb
> (1146880k)
> Trying to set memory to 1130 Mb
> (1157120k)
> Trying to set memory to 1140 Mb
> (1167360k)
> Trying to set memory to 1150 Mb
> (1177600k)
> Trying to set memory to 1160 Mb
> (1187840k)
> Trying to set memory to 1170 Mb
> (1198080k)
> Trying to set memory to 1180 Mb
> (1208320k)
> Trying to set memory to 1190 Mb
> (1218560k)
> Trying to set memory to 1200 Mb
> (1228800k)
> Trying to set memory to 1210 Mb
> (1239040k)
> Trying to set memory to 1220 Mb
> (1249280k)
> Trying to set memory to 1230 Mb
> (1259520k)
> Trying to set memory to 1240 Mb
> (1269760k)
> Trying to set memory to 1250 Mb
> (1280000k)
> Trying to set memory to 1260 Mb
> (1290240k)
> Trying to set memory to 1270 Mb
> (1300480k)
> Trying to set memory to 1280 Mb
> op. sys. refuses to provide memory
> r(909);
> 
> !uname -a
> Linux morgan 2.6.31-tuxonice #6 SMP Wed Dec 9 13:26:25 GMT 2009 x86_64
> Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz GenuineIntel GNU/Linux
> 
> ...which surprised me as its 64-bit OS and Stata (static install as I
> had issues with some of the GUI libraries).
> 
> Neil
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