mysqld CPU and memory Usage too high- 867%

Hello guys, suddenly i got this command running on top of the processes list and taking all the server resources (CPU and Memory) /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/lib/mysql/ip-[SERVER_IP].ip.secureserver.net.err --open-files-limit=8172 --pid-file=/var/lib/mysql/ip-[SERVER_IP].ip.secureserver.net.pid Any idea from where to start ? what is that command coming from ? tried to add the following to etc/my.cnf but mysql is not starting: skip-name-resolve myisam_use_mmap=1 max_connections=100 max_user_connections = 50 safe-show-database query_cache_type = 1 query_cache_size = 75M query_cache_limit = 2M join_buffer_size=1M read_rnd_buffer_size=1M max_allowed_packet = 10M tmp_table_size=25M max_heap_table_size=25M table_open_cache = 7500 thread_cache_size = 25 open_files_limit=30000 key_buffer_size = 500M myisam_sort_buffer_size = 256M innodb_file_per_table=1 innodb_buffer_pool_size = 1G innodb_log_file_size = 64M innodb_log_buffer_size = 8M ----------------------------- now i have those lines only : innodb_file_per_table=1 open_files_limit=8172 ----------------------------- Any idea from where to start ? what is that command coming from ?