mlockexec

mlockexec is a very simple commandline tool for keeping files locked into memory while running another process. This is useful if the process you want to run depends on fast file access.

Example usage:

Usage: mlockexec [options]

Options:
  -h, --help            show this help message and exit
  -m MEMORY, --max-memory=MEMORY
                        maximum amount of memory to lock.
  -g GLOB, --glob=GLOB  glob expression for files to lock
  -v, --verbose         Print verbose information

mlockexec -m 1G -g large_file -- myprogram args

This will lock large_file into memory before executing myprogram args. The file will be locked until myprogram exits.

The parameter --glob can be specified multiple times, and you can point to specific fields or glob patterns.

If the total filesize of the files matching glob pattern exceeds the mandatory --max-memory option, mlockexec will fail to run.