# 1. Introduction:
  The purpose of this document is to illustrate how to build DMM and run applications on it.

Note:

  Users can easily build DMM by running DMM/scripts/build.sh, which contains following steps.

# 2. Build DPDK:
  DPDK needs to be built first for DMM RTE memory dependency.

- Steps :

  Download dpdk-16.04.tar.xz from DPDK release, you can get it from [http://static.dpdk.org/rel](http://static.dpdk.org/rel)
```
    #wget http://static.dpdk.org/rel/dpdk-16.04.tar.xz
    #tar xvf dpdk-16.04.tar.xz
    #vi dpdk-16.04/config/common_base //make CONFIG_RTE_BUILD_SHARED_LIB=y, CONFIG_RTE_EXEC_ENV=y, CONFIG_RTE_LIBRTE_EAL=y
    #cd dpdk-16.04
    #make install  T=x86_64-native-linuxapp-gcc DESTDIR=/usr -j 4
    #cd x86_64-native-linuxapp-gcc
    #make           //install the dpdk which will generate .so inside lib folder in the path.
```

Note:

  Environment:
  Linux ubuntu 14.04 or some distro which support dpdk-16.04

# 3. Build DMM:

```
    #cd $(DMM_DIR)/thirdparty/glog/glog-0.3.4/ && autoreconf -ivf
    #cd $(DMM_DIR)/build
    #cmake ..
```

Note:
  $(DMM_DIR) is the directory where dmm has been cloned.
  After cmake all the makefiles and dependent .sh files will be copied under build directory.

```
    #make -j 8
```
  Then we can get libnStackAPI.so

  For centos we can use the command 'make pkg-rpm' to generate the rpm package in release/rpm.

# 4. Env Setting:

- Hugepage setting:

```
    #sudo sysctl -w vm.nr_hugepages=1024
```

Check hugepage info


```
    #cat /proc/meminfo
```

- Mount hugepages:

```
    #sudo mkdir -p /mnt/nstackhuge/
    #sudo mount -t hugetlbfs -o pagesize=2M none /mnt/nstackhuge/
    #sudo mkdir -p /var/run/ip_module
```


# 5. Build and Run the APP

- Link the app with the lib **libnStackAPI.so** first, you can refer to app_example/perf-test

- Enable detail log of nstack by setting env var

```
    #export LD_LIBRARY_PATH=/dmm/release/lib64
    #export NSTACK_LOG_ON=DBG
```

- Copy and update the module_config.json, rd_config.json into the same folder of app

- Run your app