Questions tagged [smp]
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14 questions
1 vote
1 answer
269 views
isolcpus kernel option appears to break taskset
I have a laptop with an Intel Core i7-12700H CPU, running Ubuntu 24.04 LTS. This CPU has 6 “performance“ cores, each one running 2 threads, and 8 “efficient” cores. Most of the time, the “efficient” ...
- 1,729
0 votes
2 answers
464 views
Get CPU core id executing a process which suddenly exits
In Linux, in a multi-core processor, ps, top and similar tools can show the CPU logical core id running a specific process. If the process runs for a certain amount of time, it's easy to identify it ...
- 5,195
1 vote
0 answers
67 views
Does the lack of kernel feature (XENFEAT_hvm_pirqs) cause RedHat EC2 interrupt issue?
I have a RedHat 6.5 on AWS EC2 running kernel 2.6.32.431, I have installed the ixgbevf driver with the minimum version the doc recommends. After configuration the system now has 2 queues(IRQs)： grep ...
- 45
1 vote
0 answers
821 views
Why I am not able to bind the interrupts with code LOC, IWI, RES when irqbalance is disabled?
On Ubuntu 14.04, I am trying to bind all the interrupts to core 0 and 1 out of 4 cores. I have disabled the irqbalance daemon via file /etc/init/irqbalance.override. Then I went to every interrupt in /...
6 votes
3 answers
9k views
Making a IRQ SMP Affinity change permanent
I have to change the smp_affinity of a interrupt permanently. The following code needs to be executed when the server reboots: echo "1" > /proc/irq/152/smp_affinity_list echo "2" > /proc/irq/...
- 61
7 votes
2 answers
5k views
VirtualBox guest: 16 CPUs detected but only 1 online
I am running VirtualBox (using the Qiime image http://qiime.org/install/virtual_box.html) The physical hardware is a 32 core machine. The virtual machine in VirtualBox has been given 16 cores. When ...
- 37.6k
3 votes
0 answers
1k views
How to decide how much memory to allocate per core for MPI app GENE?
This is required information for some MPI using app that I am working with... From its Makefile template: #insert memory per core and uncomment the following line #PREPROC= -D'MB_PER_CORE=750' Note ...
- 1,288