Running and Verifying Code_Saturne on a Single Node

Use PuTTY to log in to the server as the root user.

Create a case directory and go to the directory.

cd /path/to/CODE_SATURNE/
mkdir TESTCASE
cd TESTCASE

Run the following command to create a case:
```
code_saturne create -s test -c case1
```
In the previous command, test indicates the user-defined study name and case1 indicates the user-defined case name. You can change them based on the actual situation. After this command is run, a test directory is generated in the current directory, and the case1, MESH, and POST directories are generated in the test directory.

Run the following command to copy the test case file:

cp /path/to/CODE_SATURNE/code_saturne-6.0.2/examples/1-simple_junction/mesh/*  test/MESH -rf
cp /path/to/CODE_SATURNE/code_saturne-6.0.2/examples/1-simple_junction/case1/setup.xml test/case1/DATA -rf

Run the following command to set the MPI environment variable:

export CS_MPIEXEC_OPTIONS="--allow-run-as-root --mca btl ^openib"

Run the following command to run Code_Saturne on a single node:

code_saturne run -n 18 --nt=1 --param=/path/to/CODE_SATURNE/TESTCASE/test/case1/DATA/setup.xml --case=/path/to/CODE_SATURNE/TESTCASE/test/case1

**Table 1** Parameter description
Parameter	Description
-n <nprocs>	Number of MPI processes.
--nt=NTHREADS	Number of OpenMP threads of each task.
--param=<param>	Path and name of the parameter file.
--case=<case>	Case path.

If the following information is displayed, the initialization is successful:

***************************** 
  Post-calculation operations 
*****************************

Run the following command to go to the directory of test cases:
```
cd /path/to/CODE_SATURNE/TESTCASE/test/case1/RESU/year+month+day-hour+minute_round
```
A log is generated in the RESU directory each time a job is run. The log directory format is YearMonthDay-HourMinute_Sequence number of job executions in the same minute. For example, the 20200330-2104 directory contains the log of the first job execution at 21:04 on March 30, 2020, and the 20200330-2104_1 directory contains the log of the second job execution at 21:04 on March 30, 2020.

Elapsed time: XX s in the performance.log file indicates the performance. A smaller value indicates a better performance.

Figure 1 shows the command output:

Figure 1 An example result

Parent topic: Running and Verifying Code_Saturne