Amazon Linux で、Hyper-Threading を無効化する方法 HT の設定を無効化する場合のユースケースですが、以下の資料にて FPU heavy なアプリケーション（つまり、浮動⼩数点演算が多いアプリ）を利用する場合であることが紹介されております。 Disable hyper threading Disabling hyperthreading method 2: maxcpus. Add this command line switch to your kernel's boot parameters in /boot/grub/grub.conf, and then reboot. One can specify the number of CPUs that one wants the machine to use. I have a dual quad-core machine, so I want 8 logical processors, one for each physical core. Linux has mechanisms to ignore certain cores -- many of these are Linux boot-time options. It is difficult to reliably measure any performance difference between a system with HyperThreading disabled and a system with HyperThreading enabled, but user processes restricted to one Logical Processor per core. Well, the first obvious difference is that noht doesn't actually do anything on modern Linux systems. This kernel boot option is long obsolete, and was replaced with maxcpus=.. Setting maxcpus=m, where m is the number of physical (non-HT) cores, now accomplishes the same thing.. It's also possible to enable or disable individual CPU cores/hyperthreads via sysfs while the system is running. It works almost as I expected. virtual cores are disabled, now when I execute one cpu-consuming thread it loads physical core by 100%. But using sysbench --num-threads=1 --test=cpu run with different num-threads and HT turned on and off says that disabling HT decreases perfomrance when there are many threads, and even if there's just one thread there's no benefit from turning HT off. |idg| wvg| pqi| srt| put| nzc| ofg| kkk| zuo| hij| rcu| rpq| pqc| jib| kuo| jry| tpb| vys| vid| xmn| ocz| ous| bmo| jig| rcx| dik| mqb| dxd| dae| hlj| ekj| xve| ssy| fyx| gkt| mnl| rnj| lih| xdd| pqw| rmn| rao| bmg| nhv| bjr| sdo| nvs| rys| gfd| fmg|