Try reading the link http://www.stata.com/support/faqs/win/winmemory.html
for eventual reasons for this behaviour... However, I have a system with
1.5gb, winxp, and Stata mem defined to 900m and it loads a file with 680mb
with no problems at all (it has 3400000 observations and 57 vars).
Best,
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Jeph Herrin
Sent: 20 August 2006 16:50
To: [email protected]
Subject: Re: st: file size problems
Sorry, perhaps I should have been more clear. I have 3 distinct questions:
1) Why does a 500mb file require 800mb of Stata memory?
2) How to get around "op. sys. refuses to supply memory" error
when using -set mem 1000m- in winxp (when xp should be able
to access at least 2.5gb, and no other apps are running)?
3) How to drop observations once the file is in memory, when
-keep if mycondition- gives a "no room to add more obs" error
(and there is no way to increase memory)?
thanks,
Jeph
b. water wrote:
> how about using the set memory to increase Stata memory allocation? have
you tried this?
>
> bw
>
>
>
>
> ----------------------------------------
>> Date: Sat, 19 Aug 2006 19:36:48 -0400
>> From: [email protected]
>> To: [email protected]
>> Subject: st: file size problems
>>
>> I'm using Stata 9.2 on WinXP (SP2), updated.
>>
>> I have a file which is 500mb, but when I load it into Stata, it
>> requires 825mb. That doesn't seem right:
>>
>> . dir first.dta
>> 500.7M 8/19/06 18:33 first.dta
>>
>> . u first.dta, clear
>>
>> . d
>>
>> Contains data from first.dta
>> obs: 75,006,197
>> vars: 3 19 Aug 2006 18:33
>> size: 825,068,167 (12.6% of memory free)
>> ---------------------------------------------------
>>
>>
>> This is a problem, because WinXp will only allocate 900mb to Stata
>> (anyone know how to change this? the machine has 4gb). The first
>> thing I want to do when I load this file is:
>>
>> . keep if month<mdy(1,1,2000)
>>
>> however:
>>
>> no room to add more variables due to width
>> An attempt was made to add a variable that would have increased
>> the memory required to store an observation beyond
>> what is currently possible. You have the following alternatives:
>>
>> 1. Store existing variables more efficiently; see help compress.
>>
>> 2. Drop some variables or observations; see help drop. (Think
>> of Stata's data area as the area of a rectangle;
>> Stata can trade off width and length.)
>>
>> 3. Increase the amount of memory allocated to the data area
>> using the set memory command; see help memory.
>> r(902);
>>
>>
>>
>> I can't drop any other variables (note that there are only 3). Any
>> ideas? In particular, is there an alternative to "keep" that doesn't add
a variable?
>>
>> thanks,
>> Jeph
>> *
>> * For searches and help try:
>> * http://www.stata.com/support/faqs/res/findit.html
>> * http://www.stata.com/support/statalist/faq
>> * http://www.ats.ucla.edu/stat/stata/
>
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*
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