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‎20-concurrency/primes/log-procs.txt‎

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1 42.05
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2 22.81
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3 15.95
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4 13.28
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5 12.27
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6 10.38
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7 11.00
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8 11.41
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9 12.17
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10 12.69
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11 11.34
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12 11.35
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13 10.88
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14 11.63
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15 11.79
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16 11.49
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17 11.29
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18 10.78
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19 10.92
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20 11.07
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1 40.47
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2 22.93
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3 15.88
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4 13.25
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5 12.22
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6 10.95
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7 10.81
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8 11.26
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9 11.96
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10 12.43
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11 11.19
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12 10.91
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13 11.03
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14 10.56
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15 10.62
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16 11.73
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17 11.00
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18 12.81
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19 12.38
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20 11.28
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1 40.81
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2 22.79
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3 15.83
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4 13.27
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5 12.33
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6 10.65
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7 10.94
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8 11.48
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9 11.78
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10 12.78
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11 11.31
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12 10.97
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13 10.80
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14 10.93
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15 10.69
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16 10.57
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17 10.54
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18 10.55
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19 10.79
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20 10.64
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1 40.85
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2 22.67
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3 16.05
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4 13.21
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5 12.53
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6 10.84
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7 10.80
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8 11.31
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9 11.69
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10 12.51
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11 11.22
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12 11.35
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13 11.00
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14 10.64
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15 10.89
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16 10.49
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17 10.55
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18 10.76
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19 10.54
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20 10.75
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1 40.41
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2 22.75
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3 15.87
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4 13.19
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5 12.33
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6 10.50
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7 10.84
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8 11.55
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9 11.79
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10 12.53
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11 11.24
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12 11.13
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13 10.89
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14 10.52
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15 10.74
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16 10.68
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17 10.88
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18 10.61
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19 11.07
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20 10.71
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1 40.45
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2 22.73
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3 16.35
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4 13.09
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5 12.19
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6 10.39
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7 11.01
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8 11.30
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9 11.81
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10 12.24
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11 11.21
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12 11.13
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13 10.66
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14 10.56
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15 10.91
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16 10.49
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17 10.58
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18 10.61
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19 10.60
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20 10.69
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1 40.36
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2 22.64
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3 15.95
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4 13.20
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5 12.27
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6 10.34
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7 10.47
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8 11.34
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9 11.68
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10 12.30
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11 11.04
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12 10.85
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13 10.78
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14 10.64
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15 10.63
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16 10.58
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17 10.67
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18 10.64
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19 10.71
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20 10.68
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1 40.70
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2 22.71
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3 15.81
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4 13.10
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5 12.29
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6 10.34
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7 10.40
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8 11.40
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9 11.71
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10 12.56
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11 11.29
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12 10.99
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13 10.51
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14 10.69
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15 10.53
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16 11.04
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17 10.67
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18 10.71
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19 10.86
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20 10.78
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1 40.69
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2 22.80
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3 15.88
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4 13.13
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5 12.19
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6 10.36
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7 10.77
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8 11.32
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9 11.66
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10 12.29
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11 11.06
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12 10.89
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13 10.66
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14 10.61
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15 10.36
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16 10.57
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17 10.94
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18 10.57
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19 10.81
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20 10.72
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1 40.81
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2 22.76
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3 15.84
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4 13.10
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5 12.25
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6 10.33
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7 10.58
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8 11.51
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9 11.69
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10 12.45
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11 11.51
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12 11.53
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13 10.61
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14 10.52
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15 10.57
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16 10.57
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17 10.76
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18 10.60
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19 10.66
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20 10.73
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1 40.84
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2 22.83
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3 15.86
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4 13.27
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5 12.39
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6 10.45
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7 10.87
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8 11.42
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9 11.70
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10 12.55
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11 11.43
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12 10.98
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13 10.81
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14 10.69
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15 10.68
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16 10.71
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17 10.80
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18 10.76
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19 10.90
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20 11.02
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1 40.99
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2 22.99
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3 16.10
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4 13.46
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5 12.45
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6 10.47
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7 10.79
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8 11.74
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9 11.64
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10 12.37
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11 11.20
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12 11.09
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13 10.82
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14 10.61
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15 10.56
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16 10.53
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17 10.60
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18 10.81
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19 10.72
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20 10.62
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1 40.94
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2 23.09
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3 16.03
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4 13.40
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5 12.51
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6 10.38
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7 10.58
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8 11.37
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9 11.75
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10 12.87
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11 12.11
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12 11.37
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13 11.84
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14 11.30
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15 11.29
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16 11.36
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17 11.01
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18 11.37
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19 11.07
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20 10.94

‎20-concurrency/primes/procs.py‎

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# tag::PRIMES_PROC_TOP[]
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from time import perf_counter
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from typing import Tuple, List, NamedTuple
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from multiprocessing import Process, SimpleQueue # <1>
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from typing import Tuple, NamedTuple
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from multiprocessing import Process, SimpleQueue, cpu_count # <1>
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from multiprocessing import queues # <2>
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import sys
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from primes import is_prime, NUMBERS
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class Result(NamedTuple): # <3>
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flag: bool
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elapsed: float
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13-
JobQueue = queues.SimpleQueue[Tuple[int, Result]] # <4>
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JobQueue = queues.SimpleQueue[int] # <4>
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ResultQueue = queues.SimpleQueue[Tuple[int, Result]] # <5>
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15-
def check(n: int) -> Result: # <5>
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def check(n: int) -> Result: # <6>
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t0 = perf_counter()
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res = is_prime(n)
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return Result(res, perf_counter() - t0)
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def job(n: int, results: JobQueue) -> None: # <6>
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results.put((n, check(n))) # <7>
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def worker(jobs: JobQueue, results: ResultQueue) -> None: # <7>
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while n := jobs.get(): # <8>
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result = check(n) # <9>
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results.put((n, result)) # <10>
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# end::PRIMES_PROC_TOP[]
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# tag::PRIMES_PROC_MAIN[]
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def main() -> None:
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if len(sys.argv) < 2: # <1>
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workers = cpu_count()
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else:
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workers = int(sys.argv[1])
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t0 = perf_counter()
27-
results: JobQueue = SimpleQueue() # <1>
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workers: List[Process] = [] # <2>
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jobs: JobQueue = SimpleQueue() # <2>
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results: ResultQueue = SimpleQueue()
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print(f'Checking {len(NUMBERS)} numbers with {workers} processes:')
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30-
for n in NUMBERS:
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worker = Process(target=job, args=(n, results)) # <3>
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worker.start() # <4>
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workers.append(worker) # <5>
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for n in NUMBERS: # <3>
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jobs.put(n)
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35-
for _ in workers: # <6>
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for _ in range(workers):
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proc = Process(target=worker, args=(jobs, results)) # <4>
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proc.start() # <5>
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jobs.put(0) # <6>
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while True:
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n, (prime, elapsed) = results.get() # <7>
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label = 'P' if prime else ' '
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print(f'{n:16} {label} {elapsed:9.6f}s')
39-
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print(f'{n:16} {label} {elapsed:9.6f}s') # <8>
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if jobs.empty(): # <9>
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break
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time = perf_counter() - t0
4257
print('Total time:', f'{time:0.2f}s')

‎20-concurrency/primes/run_procs.sh‎

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#/bin/bash
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for i in {1..20}; do echo -n $i; python3 procs.py $i | tail -1; done

‎20-concurrency/primes/spinner_prime_async_broken.py‎

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# spinner_async_experiment.py
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# credits: Example by Luciano Ramalho inspired by
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# Michele Simionato's multiprocessing example in the python-list:
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# https://mail.python.org/pipermail/python-list/2009-February/675659.html
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import asyncio
8+
import itertools
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import primes
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async def spin(msg: str) -> None:
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for char in itertools.cycle(r'\|/-'):
14+
status = f'\r{char} {msg}'
15+
print(status, flush=True, end='')
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try:
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await asyncio.sleep(.1)
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except asyncio.CancelledError:
19+
break
20+
print('THIS WILL NEVER BE OUTPUT')
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async def check(n: int) -> int:
23+
return primes.is_prime(n) # <4>
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async def supervisor(n: int) -> int:
26+
spinner = asyncio.create_task(spin('thinking!')) # <1>
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print('spinner object:', spinner) # <2>
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result = await check(n) # <3>
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spinner.cancel() # <5>
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return result
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# end::SPINNER_ASYNC_EXPERIMENT[]
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33+
def main() -> None:
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n = 5_000_111_000_222_021
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result = asyncio.run(supervisor(n))
36+
msg = 'is' if result else 'is not'
37+
print(f'{n:,} {msg} prime')
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if __name__ == '__main__':
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main()

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