24 cores and MYSQL is using 1 on INSERT - mysql

Question

Hi my server have 24 cores and 32GB of memory.
Am doing multiple "INSERT INTO SELECT" of 50 millions row at a time.
This takes about 15h a query but it is ticking along at 100% of only one CPU, I'am trying to get mySQL(5.5)(InnoDB) to use more of the resources.
I have read multiple threads about it, but I do not get it to work.
Most info is about adding innodb_thread_concurrency = 0
But I still get no results.
port = 3306
socket = /var/run/mysqld/mysqld.sock
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /media/ssd/db
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
innodb_buffer_pool_size=26G
innodb_thread_concurrency = 0
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 1000M
max_allowed_packet = 160M
thread_stack = 192K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
table_cache = 800
query_cache_limit = 5000M
query_cache_size = 1600M
join_buffer_size = 1000M
log_error = /var/log/mysql/error.log
# Here you can see queries with especially long duration
log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 2

Answer 1

Try this parameters:
innodb_io_capacity=5000 (or even 20000 depending on your IO subsystem)
innodb_buffer_pool_size=4G (for example)
innodb_log_file_size=1G
innodb_write_io_threads = 64
innodb_read_io_threads = 64
innodb_thread_concurrency = 0