I found two commands to output information about my CPU: cat /proc/cpuinfo and lscpu. /proc/cpuinfo shows that my CPU speed is 2.1 Ghz, whereas lspcu says it is 3167 Mhz. Which one is correct?
I have access to an 8-core node of a Linux cluster. When logged in to the node, I can see a list of processors using this command:
Last Friday I upgraded my Ubuntu server to 11.10, which now runs with a 3.0.0-12-server kernel. Since then the overall performance has dropped dramatically. Before the upgrade the system load was about 0.3, but currently it is at 22-30 on an 8 core CPU system with 16GB of RAM (10GB free, no swap used).
I’m observing a high load average on a certain machine (about 9) in all three load fields. I understand load as the number of processes in state “run” / currently desiring CPU time. Am I correct at reasoning that if N processes are running on my machine this cannot produce a load greater than N?
I operate a Linux system which has a lot of users but sometimes an abuse occurs; where a user might run a single process that uses up more than 80% of the CPU/Memory.
Looking at the source of strace I found the use of the clone flag CLONE_IDLETASK which is described there as:
Searching for what one can monitor with perf_events on Linux, I cannot find what Kernel PMU event are?
Namely, with perf version 3.13.11-ckt39 the perf list shows events like:
I’m trying to disable some CPUs of my server.
I’ve found this link: https://www.cyberciti.biz/faq/debian-rhel-centos-redhat-suse-hotplug-cpu/linux-turn-on-off-cpu-core-commands/, which offers me a method as below:
I’ve got an Intel i7 2700k here, and I’d like to know how I can tell which processors are physical and which are virtual (ie: hyperthreading). I’m currently running a Conky script to display my CPU temps, frequencies, and loads, but I’m not sure that I’ve done it right:
I have been looking into the iowait property shown in top utility output as shown below.