@Martti,

Are you sure? let me give it a try on my Ubuntu 20.04 server.

130 root@octopuslabs /home/ubuntu # apt install mytop :(
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following packages were automatically installed and are no longer required:
galera-3 libcgi-fast-perl libcgi-pm-perl libencode-locale-perl libfcgi-perl libhtml-parser-perl libhtml-tagset-perl libhtml-template-perl libhttp-date-perl libhttp-message-perl libio-html-perl liblwp-mediatypes-perl libsnappy1v5
libtimedate-perl liburi-perl mariadb-common mariadb-server-core-10.3 socat
Use ‘sudo apt autoremove’ to remove them.
The following additional packages will be installed:
default-mysql-client mysql-client-8.0 mysql-client-core-8.0
The following packages will be REMOVED:
mariadb-client-10.3 mariadb-client-core-10.3 mariadb-server-10.3
The following NEW packages will be installed:
default-mysql-client mysql-client-8.0 mysql-client-core-8.0 mytop
0 upgraded, 4 newly installed, 3 to remove and 1 not upgraded.
Need to get 4259 kB of archives.
After this operation, 53.6 MB disk space will be freed.
Do you want to continue? [Y/n]

@Eduardo,

Check this article to fine-tune your MySQL Performance – 15 Useful MySQL/MariaDB Performance Tuning and Optimization Tips.

Thanks, Ravi. Another tool instead of mytop?. my problem continues, mysqld consumes 100% processors.