OpenMPI - HackMD

# OpenMPI :::success 1. 載入編譯器環境 ``` [user@ilgn01 ~]$ ml load gcc/8.5.0 openmpi/4.1.6 [user@ilgn01 ~]$ ml list Currently Loaded Modules: 1) gcc/8.5.0 2) openmpi/4.1.6 ``` <font color="blue">備註:Module 採用階層式的設計，要先 load 一個 module 後，才能看到下一層相依的 module，避免搭配錯相依套件。**順序要先load gcc 再 load openmpi。**</font> 2. 確認載入的編譯器 ``` [user@ilgn01 ~]$ whereis mpicc mpicc: /pkg/mpi/gcc-8.5.0/openmpi/4.1.6/bin/mpicc ``` 3. 撰寫MPI程式碼 (此以hello.c 為例) ``` [user@ilgn01 ~]$ vi hello.c #include <mpi.h> #include <stdio.h> int main(int argc, char** argv) { MPI_Init(NULL, NULL); int world_size; MPI_Comm_size(MPI_COMM_WORLD, &world_size); int world_rank; MPI_Comm_rank(MPI_COMM_WORLD, &world_rank); char processor_name[MPI_MAX_PROCESSOR_NAME]; int name_len; MPI_Get_processor_name(processor_name, &name_len); printf("Hello world from processor %s, rank %d out of %d processors\n", processor_name, world_rank, world_size); MPI_Finalize(); } ``` 4. 使用mpicc編譯hello.c ``` [user@ilgn01 ~]$ mpicc -o hello_openmpi ./hello.c ``` 5. 撰寫Slurm Job (以job.sh為例) ``` [user@ilgn01 ~]$ vi job.sh #!/bin/bash #SBATCH --account=GOVXXXXX # Project Name #SBATCH -J test # Job name #SBATCH -N 2 # Total number of nodes requested #SBATCH -n 150 # Total number of mpi tasks requested #SBATCH -t 00:30:00 # Run time (hh:mm:ss) - 1.5 hours #SBATCH --partition=XXXX # Partition Name #SBATCH -o job.%j.out # (-o) Path to the standard output file #SBATCH -e job.%j.err # (-e) Path to the standard error file #SBATCH --mail-type=END,FAIL # Mail events (NONE, BEGIN, END, FAIL, ALL) #SBATCH --mail-user=user@example.com # Where to send mail. Set this to your email address module purge module load gcc/8.5.0 openmpi/4.1.6 mpirun ./hello_openmpi ``` 6. 提交Slurm Job ``` [user@ilgn01 ~]$ sbatch job.sh Submitted batch job 56448 ``` 7. 查看執行輸出的結果 ``` [user@ilgn01 ~]$ cat job.56448.out Hello world from processor icpnp335, rank 31 out of 150 processors Hello world from processor icpnp335, rank 34 out of 150 processors Hello world from processor icpnp335, rank 39 out of 150 processors Hello world from processor icpnp335, rank 42 out of 150 processors Hello world from processor icpnp335, rank 43 out of 150 processors Hello world from processor icpnp335, rank 50 out of 150 processors Hello world from processor icpnp335, rank 51 out of 150 processors Hello world from processor icpnp335, rank 59 out of 150 processors Hello world from processor icpnp336, rank 132 out of 150 processors Hello world from processor icpnp336, rank 136 out of 150 processors Hello world from processor icpnp336, rank 137 out of 150 processors Hello world from processor icpnp336, rank 139 out of 150 processors Hello world from processor icpnp336, rank 140 out of 150 processors Hello world from processor icpnp336, rank 142 out of 150 processors Hello world from processor icpnp336, rank 143 out of 150 processors ... ``` **<font color="blue">備註:如何撰寫腳本請移至[提交與管理Job範例](https://man.twcc.ai/@f1-manual/slurm_job_example)觀看內容</font>**  :::