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From |
Austin Nichols <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: StataMP will not utilize multiple processors (Windows XP) |

Date |
Fri, 31 Jul 2009 14:35:59 -0400 |

MP only does fine-grain parallelization; -bootstrap- and -simulate- do not send iterations to separate processors, but each iteration to all available processors. About a year ago, I wrote -bs2- and -sim2- to split iterations across processors (just need to keep track of a list of random numbers), but they did not perform all that well, so I never released them. See the table on p.17 of http://www.stata.com/statamp/report.pdf for some expected time improvements for different commands. Can you show us some timings for your system like this: . drawnorm v1-v50, n(100000) clear (obs 100000) r; t=13.26 14:22:03 . qui reg v* r; t=1.86 14:22:10 . set processor 1 number of available processor(s) changed from 2 to 1 r; t=0.00 14:22:15 . qui reg v* r; t=3.07 14:22:23 . qui bs: reg v* r; t=123.09 14:24:51 . set processor 2 number of available processor(s) changed from 1 to 2 r; t=0.00 14:25:04 . qui bs: reg v* r; t=90.16 14:26:39 On Fri, Jul 31, 2009 at 11:54 AM, Cohen, Elan<cohened@upmc.edu> wrote: >> How do you know you are only using one processor? > > I'm watching the task manager as it's running. The Stata process only uses 13% of the CPU which is approximately 1/8 of 100%. > >> The bootstrap is not parallelized, but each iteration of the >> estimation should be. > > This begs the question, are there some Stata commands that are built to run on multiple processors and some that aren't? I would've thought, if any, bootstrap would work on multiple processors. > > >> On Fri, Jul 31, 2009 at 10:36 AM, Cohen, Elan<cohened@upmc.edu> wrote: >> > Hi all, >> > >> > I'm running StataMP on a Windows server running XP. The >> computer has a Quad core processor, so 8 processors show up >> in the task manager (due to hyper threading, I believe). >> > >> > However, if I run a command, such as bootstrap, Stata will >> only allocate 1 processor to do the job. * * 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: StataMP will not utilize multiple processors (Windows XP)***From:*"Cohen, Elan" <cohened@upmc.edu>

**References**:**st: StataMP will not utilize multiple processors (Windows XP)***From:*"Cohen, Elan" <cohened@upmc.edu>

**Re: st: StataMP will not utilize multiple processors (Windows XP)***From:*Austin Nichols <austinnichols@gmail.com>

**RE: st: StataMP will not utilize multiple processors (Windows XP)***From:*"Cohen, Elan" <cohened@upmc.edu>

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