phasicFlow/benchmarks/rotatingDrum/readme.md

Benchmarks of rotating drum (v-1.0)

Problem definition

Compare the computational efficiency by rotatingDrum tutorials using phasicFlow in different calculation loads. The calculation time and memory usage when the number of particles tested was 250 k, 500 k, 1 m, 2 m, 4 m and 8 m.

A view of rotating drum

Performance tests were conducted separately on laptops and workstations, and the configuration information for laptops and workstations is shown in Table 1.

Table 1. The parameters of laptop and workstation.

computer	CPU	GPU	Operating system
Laptop	Intel i9-13900HX 2.2 GHz	NVIDIA Geforce RTX 4050Ti 6G	Ubuntu 22.04
workstation	Intel xeon 4210 2.2 GHz	NVIDIA RTX A4000 16G	Ubuntu 22.04

A total of 6 sets of operating condition tests were conducted, with particle quantities of 250 k, 500 k, 1 m, 2 m, 4 m and 8 m in sequence, the particle diameter, drum length, and drum diameter under each operating condition are shown in Table 2.

Table 2. The parameters setting of different rotating drum.

Case name	Particle diameter	Particle numbers	Rotating drum length	Rotating drum radius
250 k	6 mm	250,000	0.8 m	0.2 m
500 k	5 mm	500,000	0.8 m	0.2 m
1 m	4 mm	1,000,000	0.8 m	0.2 m
2 m	3 mm	2,000,000	1.2 m	0.2 m
4 m	3 mm	4,000,000	1.6 m	0.2 m
8 m	2 mm	8,000,000	1.6 m	0.2 m

Table 3 shows the calculation time of phasicFlow under different operating conditions on laptops and desktops. It can be seen from the table that the increase in calculation time is linearly proportional to the increase in particle count. Using an A4000 graphics card results in a calculation speed approximately 30% faster than using a 4050Ti.

Table 3 The calculation time of phasicFlow.

Software	250 k	500 k	1 m	2 m	4 m	8 m
phasicFlow-4050Ti	54 min	111 min	216 min	432 min
phasicFlow-A4000	38 min	73 min	146 min	293 min	589 min	1188 min

Table 4 shows the memory usage of phasicFlow under different operating conditions on laptops and workstations. According to the table, phasicFlow uses approximately 0.7 GB of memory per million particles.

Table 4 The memory usage of phasicFlow.

Software	250 k	500 k	1 m	2 m	4 m	8 m
phasicFlow-4050Ti	252 MB	412 MB	710 MB	1292 MB
phasicFlow-A4000	344 MB	480 MB	802 MB	1386 MB	2590 MB	4966 MB