input

I/O multiplexing: select, poll and epoll in Linux

By Karunesh Johri • Updated: February 19, 2023

1.0 I/O multiplexing I/O multiplexing is the the ability to perform I/O operations on multiple file descriptors. Input operations like read, accept and calls for receiving messages block when there is no incoming data. So, if an input call is made and it blocks, we may miss data from other file descriptors. To circumvent this, …

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Tags: client, epoll, example program, file descriptors, input, io multiplexing, poll, select, server, socket

iostat

By Karunesh Johri • Updated: February 20, 2023

The iostat command is for getting the CPU and input-output devices' statistics for Linux and Unix systems. For example, $ iostat Linux 3.0.0-14-generic (hostname) Wednesday 06 June 2012 _i686_ (2 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 17.38 0.13 3.13 1.63 0.00 77.74 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda 11.78 111.65 69.79 11663838 …

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Tags: command, CPU, device, input, iostat, Linux, options, output, statistics, sysadmin, System administration, systems, Unix