On 2011年11月14日 22:03, Eric B Munson wrote: > On Mon, 14 Nov 2011, bill4carson wrote: > >> >> On 2011年11月14日 16:00, Easley wrote: >>> I add "hugepagesz=1M hugepages=32" to grub.conf. >>> The "hugepagesz=16M" doesn't take effect. >>> The "hugepages=32" take effect. >>> What type is hardware support that? >>> >>> Any help will be appreciated. >>> >>> --Easley >> hugepagesz=16M only work for x86_64 platform, >> check arch/x86/mm/hugetlbpage.c setup_hugepagesz >> >> guess your machine is an 32 bit x86. > I guess my replies aren't getting through... > > 16MB pages are only supported by POWERPC, with a 2MB default size I you are > either running x86_64 or x86 with PAE. On the RHEL 5.4 kernel that is the > only > valid page size for that arch. > > Eric > Hi, Eric
Thanks for you clarification:) for x86_64: PMD_SIZE = 2^21 = 2M bytes PUD_SIZE = 2^30 = 1G bytes I mistaken this one for others :( I also checked ld.hugetlbfs, as you said, only PPC support 16MB huge page. So it seems 1GB huge page on x86 barely used in real world. bill >> >> >>> ------------------ Original ------------------ >>> *From: * "bill4carson"<bill4car...@gmail.com>; >>> *Date: * Mon, Nov 14, 2011 09:47 AM >>> *To: * "Easley"<ugi...@gmail.com>; >>> *Cc: * "libhugetlbfs-devel"<libhugetlbfs-devel@lists.sourceforge.net>; >>> *Subject: * Re: [Libhugetlbfs-devel] How to change the hugepagesize? >>> >>> >>> On 2011年11月10日 17:27, Easley wrote: >>>> Thank you very much. >>>> I still have a question. How can I know that have been take effect? >>>> I take steps as follow: >>>> ------------------ >>>> mkdir /hugetlb >>>> mount -t hugetlbfs hugetlbfs /hugetlb >>>> HUGETLB_MORECORE=yes LD_PRELOAD=libhugetlbfs.so hugepagesz=16M >>>> hugepages=32 ./myprogram >>>> ------------------ >>>> That's right? >>> No >>> >>> hugepagesz=16M hugepages=32 is for kernel boot command line >>> >>> HUGETLB_MORECORE=yes LD_PRELOAD=libhugetlbfs.so will let malloc get huge >>> page based memory. >>> >>> >>> >>>> Easley >>>> ------------------ Original ------------------ >>>> *From: * "bill4carson"<bill4car...@gmail.com>; >>>> *Date: * Thu, Nov 10, 2011 11:24 AM >>>> *To: * "Easley"<ugi...@gmail.com>; >>>> *Cc: * "libhugetlbfs-devel"<libhugetlbfs-devel@lists.sourceforge.net>; >>>> *Subject: * Re: [Libhugetlbfs-devel] How to change the hugepagesize? >>>> >>>> >>>> On 2011年11月10日 10:41, Easley wrote: >>>>> Hi, >>>>> >>>>> I run "grep Huge /proc/meminfo" in rhel5.4 . >>>>> it shows: >>>>> HugePages_Total: 0 >>>>> HugePages_Free: 0 >>>>> HugePages_Rsvd: 0 >>>>> Hugepagesize: 2048 kB >>>>> >>>>> It says hugepagesize is 2M, how can I change the size to 16M? >>>>> Any help will be appreciated. >>>>> >>>>> Easley >>>> You can *only* do this by adding "hugepagesz=16M hugepages=32" into >>>> you command line >>>> to preallocate 32 16M hugepages. >>>> >>>> Prerequisite is you hardware support 16M huge page. >>>> >>>>> >>> ------------------------------------------------------------------------------ >>>>> RSA(R) Conference 2012 >>>>> Save $700 by Nov 18 >>>>> Register now >>>>> http://p.sf.net/sfu/rsa-sfdev2dev1 >>>>> >>>>> >>>>> _______________________________________________ >>>>> Libhugetlbfs-devel mailing list >>>>> Libhugetlbfs-devel@lists.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/libhugetlbfs-devel >>>> -- >>>> I am a slow learner >>>> but I will keep trying to fight for my dreams! >>>> >>>> --bill >>>> >>> -- >>> I am a slow learner >>> but I will keep trying to fight for my dreams! >>> >>> --bill >>> >> -- >> I am a slow learner >> but I will keep trying to fight for my dreams! >> >> --bill >> >> >> ------------------------------------------------------------------------------ >> RSA(R) Conference 2012 >> Save $700 by Nov 18 >> Register now >> http://p.sf.net/sfu/rsa-sfdev2dev1 >> _______________________________________________ >> Libhugetlbfs-devel mailing list >> Libhugetlbfs-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/libhugetlbfs-devel -- I am a slow learner but I will keep trying to fight for my dreams! --bill ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Libhugetlbfs-devel mailing list Libhugetlbfs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libhugetlbfs-devel
