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<p>Created page with &quot;&lt;b&gt;ps&lt;/b&gt; - report a snapshot of the current processes. ====How to read PS (Basics)==== ---- Example: $ ps PID TTY TIME CMD 8741 pts/0 00:00:00 bash 8863 pts/0 00:00:00 ps * PID = Process ID * pts = Psuedo Terminal Session Show all processes running on the system: $ ps -ef UID PID PPID C STIME TTY TIME CMD root 1 0 0 May10 ? 00:00:25 /usr/lib/systemd/systemd --switched-root --system --deserialize 22 root...&quot;</p> <p><b>New page</b></p><div>&lt;b&gt;ps&lt;/b&gt; - report a snapshot of the current processes.<br /> <br /> ====How to read PS (Basics)====<br /> ----<br /> Example:<br /> $ ps<br /> PID TTY TIME CMD<br /> 8741 pts/0 00:00:00 bash<br /> 8863 pts/0 00:00:00 ps<br /> * PID = Process ID<br /> * pts = Psuedo Terminal Session<br /> <br /> Show all processes running on the system:<br /> $ ps -ef<br /> UID PID PPID C STIME TTY TIME CMD<br /> root 1 0 0 May10 ? 00:00:25 /usr/lib/systemd/systemd --switched-root --system --deserialize 22<br /> root 2 0 0 May10 ? 00:00:00 [kthreadd]<br /> root 4 2 0 May10 ? 00:00:00 [kworker/0:0H]<br /> root 5 2 0 May10 ? 00:00:01 [kworker/u4:0]<br /> root 6 2 0 May10 ? 00:00:00 [mm_percpu_wq]<br /> root 7 2 0 May10 ? 00:00:00 [ksoftirqd/0]<br /> root 8 2 0 May10 ? 00:00:08 [rcu_sched]<br /> root 9 2 0 May10 ? 00:00:00 [rcu_bh]<br /> root 10 2 0 May10 ? 00:00:00 [migration/0]<br /> root 11 2 0 May10 ? 00:00:00 [watchdog/0]<br /> root 12 2 0 May10 ? 00:00:00 [cpuhp/0]<br /> root 13 2 0 May10 ? 00:00:00 [cpuhp/1]<br /> root 14 2 0 May10 ? 00:00:00 [watchdog/1]<br /> root 15 2 0 May10 ? 00:00:00 [migration/1]<br /> root 16 2 0 May10 ? 00:00:00 [ksoftirqd/1]<br /> root 18 2 0 May10 ? 00:00:00 [kworker/1:0H] <br /> * PPID = Parent PID<br /> * ? = Process running as a daemon, not attached to the terminal. <br /> * Commands in [] = Kernel threads<br /> <br /> <br /> ====How to find the processor which a process is running on====<br /> ----<br /> <br /> 1. Run the following commands and then review the output to determine the following:<br /> <br /> * The process ID of the process. In this example, we are showing the aws-replication-agent process.<br /> # pidof &lt;process&gt;<br /> # pidof /var/lib/aws-replication-agent/jre/bin/java<br /> <br /> * The CPU core (indicated by psr) that it&#039;s running on.<br /> # ps --pid $(pidof &lt;process&gt;) -o psr,pid,comm<br /> # ps --pid $(pidof /var/lib/aws-replication-agent/jre/bin/java) -o psr,pid,comm<br /> <br /> Then, check the CPU utilization of the identified CPU core.<br /> # mpstat -P &lt;psr column value&gt; 3</div>

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