strace -p 进程号输出sched_yield = 0

The strace command with the -p option followed by a process ID (进程号) is used to attach to a running process and trace its system calls and signals.

In this specific output line, sched_yield() is a system call that causes the calling thread to relinquish the CPU and allow other threads to be scheduled. The return value of 0 indicates that the system call was successful.