Is it auto done by gcc in default?

If so, why need graphite?

How to output the auto parallelized source code to see the result?

mm? not sure what you're asking.
Maybe this will help -> https://gcc.gnu.org/ml/gcc/2012-07/msg00245.html


https://gcc.gnu.org/wiki/Graphite/Parallelization

Why equal to 4 ?

I mean can it generated code which can show how it loop fusion the nested for loop
In another words, will there a folder to output the loop fusion result code

sudo apt-get install build-essential
sudo apt-get install libboost-dev libboost-filesystem-dev libboost-system-dev
sudo apt-get install git-core
wget http://github.com/mit-carbon/Graphit/tarball/master -O graphit.tar.gz
or
git clone git://github.com/mit-carbon/Graphite.git

i use git, because the link of tar gz do not exist in directory
after command make, got error


from /home/wonder/Downloads/graphite/Graphite/contrib/dsent/dsent_contrib.h:4,
from /home/wonder/Downloads/graphite/Graphite/common/network/components/router/router_power_model.h:8,
from /home/wonder/Downloads/graphite/Graphite/common/network/models/network_model_emesh_hop_counter.h:5,
from /home/wonder/Downloads/graphite/Graphite/common/network/network_model.cc:8:
/home/wonder/Downloads/graphite/Graphite/contrib/db_utils/api.h:1:16: fatal error: db.h: No such file or directory
compilation terminated.
make: *** [/home/wonder/Downloads/graphite/Graphite/common/network/network_model.o] Error 1