https://github.com/Shopify/yjit
sudo apt-get install sqlite3 libsqlite3-dev
git clone https://github.com/Shopify/yjit.git yjit
cd yjit
./autogen.sh
./configure --disable-install-doc --disable--install-rdoc --prefix=$HOME/.rvm/rubies/ruby-yjit
make -j16 install
# rvm
rvm use ruby-yjit --create