Table 4 Proportions of sequential and parallel parts of task-distributors’ runtime in the cluster of Raspberry Pi computers when a single one, two, four or eight nodes (processors) are used

200 × 150

4.29

4.16

91.55

400 × 300

1.96

1.84

96.20

800 × 600

0.58

0.54

98.88

1600 × 1200

0.15

0.15

99.70

3200 × 2400

0.03

0.03

99.94

6400 × 4800

^a

0.01

99.99

200 × 150

3.78

8.49

87.73

400 × 300

2.34

8.00

89.66

800 × 600

0.90

6.76

92.34

1600 × 1200

0.27

5.95

93.78

3200 × 2400

0.05

4.39

95.56

6400 × 4800

0.01

10.31

89.68

200 × 150

3.44

9.51

87.05

400 × 300

2.57

9.67

87.76

800 × 600

1.20

9.72

89.08

1600 × 1200

0.45

8.62

90.93

3200 × 2400

0.10

6.73

93.17

6400 × 4800

0.02

12.77

87.21

200 × 150

3.04

10.47

86.49

400 × 300

2.32

11.61

86.07

800 × 600

1.63

12.41

85.96

1600 × 1200

0.54

12.81

86.65

3200 × 2400

0.14

10.53

89.33

6400 × 4800

0.03

19.11

80.86