Using Coarrays to Parallelize Legacy Fortran Applications: Strategy and Case Study

Table 3

Weak scaling performance of coarray version.

Number of images	Number of bands	Number of particles	Particles per image	Time in seconds	Runtime per particle	Efficiency
1	128	33024	33024	44.279		1.000
4	256	131584	32896	44.953		0.978
16	512	525312	32832	49.400		0.893
2	256	131584	65792	101.03		1.000
8	512	525312	65664	102.11		0.987
32	1024	2099200	65600	129.75		0.777