Servidor con 8gb de ram y no puede con 50 online ayuda porfavor.

[colextey]

Agradezco mucho la ayuda, aqui les pego lo que me pidieron:

my.cnf

[mysqld]
# bind-address=127.0.0.1
set-variable=local-infile=0
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1

# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid