# 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-18.02.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-18.02.tar.xz
    #tar xvf dpdk-18.02.tar.xz
    #vi dpdk-18.02/config/common_base
      //make CONFIG_RTE_BUILD_SHARED_LIB=y, CONFIG_RTE_EXEC_ENV=y, CONFIG_RTE_LIBRTE_EAL=y, CONFIG_RTE_EAL_PMD_PATH="/tmp/dpdk/drivers/"
    #cd dpdk-18.02
    #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.
    #mkdir -p /tmp/dpdk/drivers/
    #cp -f /usr/lib/librte_mempool_ring.so /tmp/dpdk/drivers/
```

Note:

  Environment:
  Linux ubuntu 16.04 or some distro which support dpdk-18.02

# 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. Build rsocket:

```
    #cd $(DMM_DIR)/build
    #make dmm_rsocket
```
Note:
  Make sure Mellanox OFED has been installed in your computer, or run the following command before compiling

```
    #cd $DMM_DIR/stacks/rsocket
    //Take ubuntu16.04 as an example, the tgz file has the format MLNX_OFED_LINUX-<ver>-<OS label><CPU arch>.tgz
    #wget http://www.mellanox.com/downloads/ofed/MLNX_OFED-4.4-1.0.0.0/MLNX_OFED_LINUX-4.4-1.0.0.0-ubuntu16.04-x86_64.tgz
    #tar -zxvf MLNX_OFED_LINUX-4.4-1.0.0.0-ubuntu16.04-x86_64.tgz
    #cd MLNX_OFED_LINUX-4.4-1.0.0.0-ubuntu16.04-x86_64
    #./mlnxofedinstall --force
```


# 5. 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
```


# 6. Biuld 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