affinity

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Will sched_setaffinity or pthread_attr_setaffinity_np work to set thread affinity under OpenMP? Related: CPU Affinity 回答1: Yes, named calls will work to set thread affinity. The only problem is to fix thread number and to set right affinity in right thread (you can try using static scheduling of for loop for known number of threads). As I know, almost every openmp allows to set affinity via environment. The name of environment variable varies (it was not standartized some time ago). I use http://www.spec.org/omp2001/results/omp2001.html page

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to set the CPU affinity of threads on Linux. I'd like to know which one of the following approaches is recommended: Get thread id using pthread_self() Set CPU affinity using pthread_setaffinity_np(....) by passing the thread id as an argument Get thread id using the gettid() call Set CPU affinity using sched_setaffinity(....) by passing the thread id in the place of the process id P.S: After setting the CPU affinity, I intend to increase the scheduling priority of the thread. 回答1: They are not the same . Here are some bits I

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I was reading through the paper : Ferrari et al. in the "Affinity Measures" section. I understood that Ferrari et al. tries to obtain affinity by : Location affinity - using area of intersection-over-union between two detections Appearance affinity - using Euclidean distances between Histograms KLT point affinity measure However, I have 2 main problems: I cannot understand what is actually meant by intersection-over-union between 2 detections and how to calculate it I tried a slightly difference appearance affinity measure. I transformed the

本文描述adjacent matrix和affinity matrix 的异同点。 如下图是一个无向图，其有4个点，5条边，每个边的权重为1。 如果使用 adjacent matrix描述该图，则adjacent matrix应该是4x4的方阵G, 表示定点与定点的关系， G= n1 n2 n3 n4 n1 0 1 1 1 n2 1 0 1 0 n3 1 1 0 1 n4 1 0 1 0 但是，使用 affnity matrix 则表示的是点和边之间的关系，为一个4x5的矩阵 e1 e2 e3 e4 e5 n1 1 1 1 0 0 n2 1 0 0 1 0 n3 0 1 0 1 1 n4 0 0 1 0 1 文章来源: adjacent matrix和affinity matrix之间的区别

周五晚上LVS集群的一台LB由于CPU单核耗尽挂掉了，最后查到原因是网卡调优没有生效，今天查了一下网卡调优的资料，感谢同事 higkoo 给我讲解了一下这方面的东西，下面是关于我们公司网卡调优的相关知识，欢迎大家共同探讨，让我们的机器跑的更high。 1、Broadcom的网卡建议关闭GRO功能 1 2 3 4 ethtool -K eth0 gro off ethtool -K eth1 gro off ethtool -K eth2 gro off ethtool -K eth3 gro off 2、关闭irqbalance服务并手动分配网卡中断 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 service irqbalance stop chkconfig irqbalance off # 查看网卡中断号 grep /proc/interrupts # 分配到每颗颗CPU核上 cat /proc/irq/ {84,85,86,87,88,89,90,91,92,93} /smp_affinity echo /proc/irq/84/smp_affinity echo /proc/irq/85/smp_affinity echo /proc/irq/86

In Windows, with START /node 1 /affinity ff cmd /C "app.exe" I can set the affinity of app.exe (number of cores used by app.exe). With a windows script, How I can change the affinity of a running process ? PowerShell can do this task for you Get Affinity: PowerShell "Get-Process app | Select-Object ProcessorAffinity" Set Affinity: PowerShell "$Process = Get-Process app; $Process.ProcessorAffinity=255" Example: (8 Core Processor) Core # = Value = BitMask Core 1 = 1 = 00000001 Core 2 = 2 = 00000010 Core 3 = 4 = 00000100 Core 4 = 8 = 00001000 Core 5 = 16 = 00010000 Core 6 = 32 = 00100000 Core 7 =

I am struggling to find the proper way to execute a hybrid OpenMP/MPI job with MPICH (hydra). I am easily able to launch the processes and they do make threads, but they are stuck bound to the same core as their master thread whatever type of -bind-to I tried. If I explicitly set GOMP_CPU_AFFINITY to 0-15 I get all threads spread but only provided if I have 1 process per node. I don't want that, I want one process per socket. Setting OMP_PROC_BIND=false does not have a noticeable effect. An example of many different combinations I tried export OMP_NUM_THREADS=8 export OMP_PROC_BIND="false"

I am investigating how run a process on a dedicated CPU in order to avoid context-switches. On my Ubuntu, I isolated two CPUs using the kernel parameters "isolcpus=3,7" and "irqaffinity=0-2,4-6". I am sure that it is correctly taken into account: $ cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-4.8.0-27-generic root=UUID=58c66f12-0588-442b-9bb8-1d2dd833efe2 ro quiet splash isolcpus=3,7 irqaffinity=0-2,4-6 vt.handoff=7 After a reboot, I can check that everything works as expected. On a first console I run $ stress -c 24 stress: info: [31717] dispatching hogs: 24 cpu, 0 io, 0 vm, 0 hdd And on a

Possible Duplicate: CPU Affinity I'm running on Linux and I want to write a C++ program that will set 2 specific processors that my 2 applications that will run in parallel (i.e. setting each process to run on a different core/CPU). I want to use processor affinity tool with C++. Please can anyone help with C++ code. From the command line you can use taskset(1) , or from within your code you can use sched_setaffinity(2) . E.g. #ifdef __linux__ // Linux only #include <sched.h> // sched_setaffinity #endif int main(int argc, char *argv[]) { #ifdef __linux__ int cpuAffinity = argc > 1 ? atoi(argv