修改配置文件/etc/gitlab/gitlab.rb
2 ways I found on the internet, change these options, like below.
1.sidekiq['concurrency'] = 1 #25 is the default
2.unicorn['worker_processes'] = 1 #2 is the default
gitlab-ctl reconfigure
gitlab把域名修改为ip地址
修改改/opt/gitlab/embedded/service/gitlab-rails/config/gitlab.yml