When you run htop and see just one running process, it means that it is the htop process itself. So the 1/123 means that there is one process running or ready to run at this time and there are 123 processed in total. When it's launched in the background, its process ID will be shown. Let's look at the /proc/loadavg contents again and then launch the sleep command in the background. The process ID of 1 belongs to /sbin/init which is started at boot time. Process IDs are usually increasing, unless they've been exausted and are being reused. Whenever you launch a new process, it is assigned an ID number. The last column displays the last process ID used. The fourth column shows the number of currently running processes and the total number of processes. The first three columns represent the average system load of the last 1, 5, and 15 minute periods. If you take another look at the strace output, you'll see that this file was also opened.
They are taken from the /proc/loadavg file. In addition to uptime, there were also three numbers that represent the load average. Whereas the number of seconds is more useful for using in your own programs or scripts. The uptime output is nicely formatted for humans So why do we need the uptime program if we can just read the contents of the file? It turns out that you can also use strace -e open uptime and not bother with grepping. Which contains the file /proc/uptime which I mentioned. Open( "/var/run/utmp", O_RDONLY|O_CLOEXEC) = 4 Our output is this: $ strace uptime 2>& 1 | grep open We can redirect the stderr to the standard output (stdout) stream with 2>&1. strace uptimeīut that will not really work since strace outputs everything to the standard error (stderr) stream. How did I know that? I looked at what files the uptime program opens when it is run. The second value may be greater than the overall system uptime on systems with multiple cores The second number is how much of that time the machine has spent idle, in seconds The first number is the total number of seconds the system has been up. It reads the information from the file /proc/uptime. You can see the same information by running uptime: $ uptimeġ2: 17: 58 up 111 days, 31 min, 1 user, load average: 0.00, 0.01, 0.05 Uptime shows how long the system has been running. /usr/lib/policykit-1/polkitd -no-debug./usr/lib/accountservice/accounts-daemon.t - stopped by debugger during the tracing.Z - defunct ("zombie") process, terminated but not reaped by its parent.S - interruptible sleep (waiting for an event to complete).
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