Skip to main content

System Statistics

Two entries in /proc contain useful system statistics. The /proc/loadavg file contains information about the system load. The first three numbers represent the number of active tasks on the system—processes that are actually running—averaged over the last 1, 5, and 15 minutes. The next entry shows the instantaneous current number of runnable tasks—processes that are currently scheduled to run rather than being blocked in a system call—and the total number of processes on the system. The final entry is the process ID of the process that most recently ran.
The /proc/uptime file contains the length of time since the system was booted, as well as the amount of time since then that the system has been idle. Both are given as floating-point values, in seconds. read more...

Comments

Post a Comment

Popular posts from this blog

Fixing Unix/Linux/POSIX Filenames

Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
Post a Comment
Read more

Noisy Neighbor Detection with eBPF.

  T he Compute and Performance Engineering teams at Netflix regularly investigate performance issues in our multi-tenant environment. The first step is determining whether the problem originates from the application or the underlying infrastructure. One issue that often complicates this process is the "noisy neighbor" problem. On Titus, our multi-tenant compute platform, a "noisy neighbor" refers to a container or system service that heavily utilizes the server's resources, causing performance degradation in adjacent containers. We usually focus on CPU utilization because it is our workloads’ most frequent source of noisy neighbor issues, read more 
Post a Comment
Read more

Backing up MySQL data.

Backing up files and directories is relatively easy; databases, however, have some special quirks that you need to address. Our examples use MySQL, but the same principles apply to PostgreSQL and other relational databases. This article is excerpted from O'Reilly's recently published book Linux System Administration .
Post a Comment
Read more