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GPI-2: Difference between revisions
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| logo = [[Image:copy-logo-fraunhofer-itwm.gif]] | | logo = [[Image:copy-logo-fraunhofer-itwm.gif]] | ||
| developer = Fraunhofer ITWM | | developer = Fraunhofer ITWM | ||
| available on = [[ | | available on = [[Hawk | Hawk (HPE Apollo)]] | ||
| category = [[:Category:Communication libraries | Communication libraries]] | | category = [[:Category:Communication libraries | Communication libraries]] | ||
| license = commercial | | license = commercial | ||
| Line 11: | Line 11: | ||
}} | }} | ||
=== Using GPI-2 on | === Using GPI-2 on Hawk === | ||
Load the necessary module. For example: | Load the necessary module. For example: | ||
<pre> | <pre> | ||
module load gpi2 | |||
module load | |||
</pre> | </pre> | ||
| Line 32: | Line 31: | ||
if( gaspi_proc_init(GASPI_BLOCK) != GASPI_SUCCESS ){ | if( gaspi_proc_init(GASPI_BLOCK) != GASPI_SUCCESS ){ | ||
printf("gaspi_init failed !\n"); | |||
exit(-1); | exit(-1); | ||
} | } | ||
gaspi_version(&vers); | gaspi_version(&vers); | ||
gaspi_proc_rank(&rank); | gaspi_proc_rank(&rank); | ||
gaspi_proc_num(&tnc); | gaspi_proc_num(&tnc); | ||
printf("rank: %d tnc: %d (gpi2: %.2f ugni: %.2f)\n",rank,tnc,vers,vers_gni); | |||
if( gaspi_barrier(GASPI_GROUP_ALL,GASPI_BLOCK) != GASPI_SUCCESS ){ | if( gaspi_barrier(GASPI_GROUP_ALL,GASPI_BLOCK) != GASPI_SUCCESS ){ | ||
printf("gaspi_barrier failed !\n"); | |||
exit(-1); | exit(-1); | ||
} | } | ||
| Line 57: | Line 54: | ||
<pre> | <pre> | ||
gcc -O2 hello_gpi2.c -D_GNU_SOURCE -lpmi -lugni -lrca -lGPI2 -o hello_gpi2.bin | |||
</pre> | </pre> | ||
=== Example to run the program | === Example to run the program === | ||
GPI-2 Applications should be started with one process per NUMA Socket. Use threads to exploit | |||
SMP parallelism on each NUMA Socket (e.g. mctp3 for best performance). Ex.: | |||
<pre> | <pre> | ||
# 2 nodes, | # 2 nodes, 128 cores (ht is enabled), interactive | ||
qsub -I -l | qsub -I -l select=2:node_type=rome:mpiprocs=128,walltime=00:05:00 | ||
# 4 procs on 2 nodes,socket affinity mask, ht on | # 4 procs on 2 nodes,socket affinity mask, ht on | ||
mpirun -np 8 ./hello_gpi2.bin | |||
</pre> | </pre> | ||
Latest revision as of 21:40, 18 August 2021
| GPI-2 (Global address space Programming Interface) is a threadsafe PGAS API for Infiniband,ROCE,ETHERNET,GEMINI and ARIES networks.
GPI-2 aims at high performance, delivering wire-speed from the interconnect. It relies on one-sided and asynchronous communication that allow a perfect overlap between computation and communication. All GPI2 methods provide a timeout functionality for fault tolerant operation. With that in place, GPI-2 offers mechanisms that allow applications to react to failures and continue its execution. |
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Using GPI-2 on Hawk
Load the necessary module. For example:
module load gpi2
Example
File: hello_gpi2.c
#include <stdio.h>
#include <stdlib.h>
#include <GASPI.h>
int main(int argc,char *argv[]){
gaspi_rank_t rank,tnc;
gaspi_float vers,vers_gni;
char mtype[16];
if( gaspi_proc_init(GASPI_BLOCK) != GASPI_SUCCESS ){
printf("gaspi_init failed !\n");
exit(-1);
}
gaspi_version(&vers);
gaspi_proc_rank(&rank);
gaspi_proc_num(&tnc);
printf("rank: %d tnc: %d (gpi2: %.2f ugni: %.2f)\n",rank,tnc,vers,vers_gni);
if( gaspi_barrier(GASPI_GROUP_ALL,GASPI_BLOCK) != GASPI_SUCCESS ){
printf("gaspi_barrier failed !\n");
exit(-1);
}
gaspi_proc_term(GASPI_BLOCK);
return 0;
}
Compilation example
gcc -O2 hello_gpi2.c -D_GNU_SOURCE -lpmi -lugni -lrca -lGPI2 -o hello_gpi2.bin
Example to run the program
GPI-2 Applications should be started with one process per NUMA Socket. Use threads to exploit SMP parallelism on each NUMA Socket (e.g. mctp3 for best performance). Ex.:
# 2 nodes, 128 cores (ht is enabled), interactive qsub -I -l select=2:node_type=rome:mpiprocs=128,walltime=00:05:00 # 4 procs on 2 nodes,socket affinity mask, ht on mpirun -np 8 ./hello_gpi2.bin