To troubleshoot what is going on in Unix and Linux systems your first step is usually top. You can run it in two modes: interactive and batch mode. In batch mode the output can be piped to any other command making it ideal to leave it croned in a server to later on analyze what is going on there:
*/1 * * * * COLUMNS=512 top -b -n 1 >> /tmp/top.log
Option b stands for batch mode. Finally "n 1" means top to end after a single iteration/refresh.
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