Cases

After enabling P2P on Arm, the LAMMPS application achieves a 100% performance improvement with two GPUs and a 249% improvement with four GPUs.
After enabling P2P on Arm, the GROningen MAchine for Chemical Simulations (GROMACS) application achieves performance comparable to that on x86 with one or two GPUs, and delivers a 9.4% performance gain over x86 with four GPUs.

Table 1 shows the acceleration effect for AMBER and LAMMPS after P2P is enabled.

**Table 1** P2P acceleration effect
Number of GPUs	GPU ID	Amber			LAMMPS
		P2P Disabled	P2P Enabled	Performance Improvement	P2P Disabled	P2P Enabled	Performance Improvement
One		134	134	+0%	130	132	+0%
Two	0 and 1	27	125	+362%	86	229	+166%
	1 and 3	26	120	+361%	82	228	+178%
	2 and 3	27	125	+362%	89	228	+156%
Four		22	89	+280%	99	387	+290%

Parent topic: P2P Communication Optimization