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From |
"Eric A. Booth" <ebooth@ppri.tamu.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: -expand-, -expandcl-, and -set mem-; limit to the number of obs? |

Date |
Sun, 11 Oct 2009 18:48:37 -0500 |

Misha wrote:

Sometimes I can only set the memory to 16g (if I ask for more I get the "op. sys. refuses to provide memory" message); sometimes I can get only 32g; and sometimes I can get 100g. What could be the problem?

Misha wrote: "Why am I asking for so much memory?", you might ask. Well, I have a data set that, when expanded, ought to give me about 2.63e+09 (i.e., nearly three billion) observations.

********** set virtual on * clear all set mem 1g set obs 1000000 desc gen i = 1 desc * clear all set mem 1g set obs 1000000 gen str244 i = "a" gen str244 i2 = "a" desc **********

Eric __ Eric A. Booth Public Policy Research Institute Texas A&M University ebooth@ppri.tamu.edu Office: +979.845.6754 On Oct 11, 2009, at 5:39 AM, Martin Weiss wrote:

<> Look at http://www.stata.com/statalist/archive/2009-07/msg00899.html and http://www.stata.com/support/faqs/win/winmemory.html HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of MishaSpisokSent: Sonntag, 11. Oktober 2009 11:51 To: statalist@hsphsun2.harvard.eduSubject: st: -expand-, -expandcl-, and -set mem-; limit to thenumber ofobs? Hello, Statalist! I have a few questions about Stata's ability to handle billions of observations. On the Stata webpage, "Which Stata is right for me," it indicates that the number of observations is unlimited for Stata versions other than Small Stata. The network computer I'm using has Stata 11.0 SE and claims to have 113,000MB of RAM available. At one point I managed to set the memory to 100g. However, on subsequent tries (after logging out and logging in), I get mixed results. Sometimes I can only set the memory to 16g (if I ask for more I get the "op. sys. refuses to provide memory" message); sometimes I can get only 32g; and sometimes I can get 100g. What could be the problem? "Why am I asking for so much memory?", you might ask. Well, I have a data set that, when expanded, ought to give me about 2.63e+09 (i.e., nearly three billion) observations. Whether I use -expand- or -expandcl- I run into the same problem, getting the message "no room to add more observations, etc." I've compressed and dropped as much as I can, but I still get this problem. Am I asking too much of Stata and/or "only" 113,000MB of RAM? Is there a back-of-the-envelope way to calculate how much RAM I would need to hold a given dataset? Thank you for your time and attention. Misha * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: RE: -expand-, -expandcl-, and -set mem-; limit to the number of obs?***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**References**:**st: -expand-, -expandcl-, and -set mem-; limit to the number of obs?***From:*Misha Spisok <misha.spisok@gmail.com>

**st: RE: -expand-, -expandcl-, and -set mem-; limit to the number of obs?***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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