Stata Mp License

    • Aug 2014
    • 1

    Using STATA MP on a computer with fewer cores

    Hi
    I'm about to buy a STATA MP license for my desktop with 8 cores. Understanding the lisence correctly, I should also be able to use the lisence on my laptop (4 cores). Is it possible to use the 8 core lisence on a 4 core laptop? Will it use eight processes on the four cores or is there some way of making it only use four?
    Best regards
    Øyvind Solheim
    • Mar 2014
    • 1254
    I regularly use Stata MP8 on a quad-core MacBook Pro. Never seems to have been an issue; I also use a six core Dell desktop at home from time to time and have a similar experience there as well.

    Comment

    • Apr 2014
    • 1542
    Dear Øyvind, the relevant settings are the following (displayed after creturn list):
    c(processors) = 7
    c(processors_lic) = 32
    c(processors_mach) = 64
    c(processors_max) = 32
    Of these four only one is a settable setting - c(processors). c(processors_lic) is the number of cpus (cores really) covered by your MP license. c(processors_mach) - is the number of processors in the machine you are using. c(processors_max) - is the maximum number of cores Stata will be using on this machine given this license. Note that it is the minimum of the c(processors_lic) and c(processors_mach). You can set your actual CPU usage to any smaller amount. In the above example 7. It doesn't have to be max, it can be just 1. It also doesn't have to be a power of 2 (though it has to be integer, which is not at all obvious why). It can be 7 as shown above. Note that there are reasons to beleive that StataMP with CPUs restricted to 1 behaves differently from StataSE. If you are doing any benchmarking, that should be treated separately.
    Will it use eight processes on the four cores or is there some way of making it only use four?
    You don't need to do anything. StataMP will start on any (in terms of #CPUs) computer including a single core. More, it will automatically detect all the settings and set the best. The above command set processors # is used only in cases when you want something else to run in parallel and you want the programs to be nice to each other. Stata will never start more computational threads than you have hardware support for (there seems to be more threads in total, but not purely computational). The 'hardware support for' can be tricky. Some CPUs have hyperthreading, which makes it look to the OS as if there are more cores than in reality. More on this StataCorp page.
    Best, Sergiy Radyakin

    Comment

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