How can I see which CPU core a thread is running in?

Question

In Linux, supposing a thread\'s pid is [pid], from the directory /proc/[pid] we can get many useful information. For example, these proc files, /proc/[pid]/status,/proc/[pid

Answer 1

The threads are not necessary to bound one particular Core (if you did not pin it). Therefore to see the continuous switching of the core you can use (a modified answer of Dmitry):

watch -tdn0.5 ps -mo pid,tid,%cpu,psr -p \`pgrep BINARY-NAME\`

For example:

watch -tdn0.5 ps -mo pid,tid,%cpu,psr -p \`pgrep firefox\`