hyperfine:tldr:325fc

This command uses a tool called hyperfine to measure the execution time of a given command. Here is a breakdown of the command and its components:

• --prepare '${make clean}': This option specifies a preparation command to be executed before each timing measurement. In this case, make clean is passed as an argument, which typically cleans the build artifacts created by the make command.

• --parameter-scan: This option indicates that we want to perform a parameter scan, where multiple executions of the command will be timed by varying a specific parameter.

• ${num_threads} ${1} ${10}: These are the parameter values that will be scanned. They are represented as shell variables, with num_threads being the first parameter, followed by 1, and finally 10. These values will be substituted into the command being timed.

• '${make -j {num_threads}}': This is the command to be timed. It starts with make -j, which typically runs the make command in parallel, utilizing a certain number of threads specified with the -j option. The {num_threads} placeholder will be replaced by the parameter value during each timing measurement.

In summary, this command uses hyperfine to measure the execution time of a make command with different values of the num_threads parameter. Before each measurement, it performs a make clean to ensure a clean build environment. The actual make command is executed in parallel with the specified number of threads.