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# 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
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