function::HZ - Linux

Overview

function::HZ is a shell function used to display the system clock rate, which defaults to 100 Hertz (Hz) for most Linux systems. It serves as a simplified alternative to the "getconf CLK_TCK" command. HZ is commonly used to determine the system’s timing parameters for tasks related to performance analysis or benchmarking.

Syntax

function::HZ

Options/Flags

This function does not support any options or flags.

Examples

• Display the system clock rate:

$ function::HZ
100

• Use the value in a calculation:

$ HZ=256; FOO=$(($HZ * 10)); echo $FOO
2560

Common Issues

• Incorrect system clock rate: If the displayed clock rate differs from the expected value, ensure that your system’s hardware and kernel are correctly configured.

Integration

function::HZ can be used with other shell commands to customize system behavior:

• Configure cron jobs: Set the scheduling interval of cron jobs based on the HZ value.
• Performance analysis: Use HZ to calibrate performance monitoring tools.

Related Commands

• getconf CLK_TCK: Retrieves the system clock rate directly.