1 | package main |
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2 | |
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3 | import ( |
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4 | "fmt" |
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5 | "sync" |
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6 | "time" |
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7 | "runtime" |
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8 | "os" |
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9 | "strconv" |
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10 | ) |
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11 | |
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12 | var Processors, Channels, ProdsPerChan, ConsPerChan, ChannelSize int = 1, 1, 1, 1, 128 |
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13 | var cons_done, prod_done bool = false, false; |
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14 | var total_operations, cons_check, prod_check uint64 = 0, 0, 0 |
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15 | var m sync.Mutex |
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16 | |
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17 | var prodJoin chan int = make(chan int, ProdsPerChan * Channels + 1) |
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18 | var consJoin chan int = make(chan int, ConsPerChan * Channels + 1) |
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19 | |
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20 | func consumer( channel chan uint64 ) { |
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21 | var count uint64 = 0 |
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22 | var checksum uint64 = 0 |
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23 | for { |
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24 | if cons_done { break } |
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25 | j := <- channel |
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26 | checksum = checksum ^ j |
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27 | if ! prod_done { count++ } |
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28 | } |
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29 | m.Lock() |
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30 | total_operations += count |
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31 | cons_check = cons_check ^ checksum |
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32 | // fmt.Print("C: ",count) |
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33 | m.Unlock() |
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34 | consJoin <- 0 |
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35 | } |
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36 | |
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37 | func producer( channel chan uint64 ) { |
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38 | var count uint64 = 0 |
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39 | var checksum uint64 = 0 |
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40 | for { |
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41 | if prod_done { break } |
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42 | checksum = checksum ^ count |
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43 | channel <- count |
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44 | count++ |
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45 | } |
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46 | m.Lock() |
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47 | total_operations += count |
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48 | prod_check = prod_check ^ checksum |
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49 | // fmt.Print("P: ",count, " ") |
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50 | m.Unlock() |
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51 | prodJoin <- 0 |
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52 | } |
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53 | |
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54 | func usage() { |
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55 | fmt.Printf( "Usage: %v " + |
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56 | "[ processors (> 0) | 'd' (default %v) ] " + |
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57 | "[ ChannelSize (> 0) | 'd' (default %v) ]\n", |
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58 | os.Args[0], Processors, ChannelSize ); |
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59 | os.Exit( 1 ); |
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60 | } |
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61 | |
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62 | func main() { |
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63 | switch len( os.Args ) { |
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64 | case 3: |
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65 | if os.Args[2] != "d" { // default ? |
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66 | ChannelSize, _ = strconv.Atoi( os.Args[2] ) |
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67 | if ChannelSize < 0 { usage(); } |
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68 | } // if |
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69 | fallthrough |
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70 | case 2: |
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71 | if os.Args[1] != "d" { // default ? |
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72 | Processors, _ = strconv.Atoi( os.Args[1] ) |
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73 | if Processors < 1 { usage(); } |
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74 | } // if |
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75 | case 1: // use defaults |
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76 | default: |
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77 | usage(); |
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78 | } // switch |
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79 | runtime.GOMAXPROCS( Processors ); |
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80 | ProdsPerChan = Processors /2 |
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81 | ConsPerChan = Processors / 2 |
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82 | |
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83 | // fmt.Println("Processors: ",Processors," Channels: ",Channels," ProdsPerChan: ",ProdsPerChan," ConsPerChan: ",ConsPerChan," Channel Size: ",ChannelSize) |
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84 | |
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85 | chans := make( [] chan uint64, Channels ) |
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86 | for i := range chans { |
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87 | chans[i] = make(chan uint64, ChannelSize) |
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88 | } |
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89 | for i := range chans { |
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90 | for j := 0; j < ProdsPerChan; j++ { |
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91 | go producer( chans[i] ) |
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92 | } |
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93 | |
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94 | for j := 0; j < ConsPerChan; j++ { |
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95 | go consumer( chans[i] ) |
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96 | } |
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97 | } |
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98 | |
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99 | |
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100 | // wait 10 seconds |
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101 | time.Sleep(time.Second * 10) |
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102 | // fmt.Println("prod done\n") |
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103 | prod_done = true |
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104 | for j := 0; j < ProdsPerChan * Channels ; j++ { |
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105 | <-prodJoin |
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106 | } |
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107 | // fmt.Println("cons done\n") |
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108 | cons_done = true |
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109 | for i := range chans { |
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110 | L: for { |
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111 | select { |
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112 | case k := <-chans[i]: |
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113 | cons_check = cons_check ^ k |
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114 | default: |
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115 | break L |
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116 | } |
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117 | } |
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118 | } |
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119 | for i := range chans { |
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120 | close(chans[i]) |
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121 | } |
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122 | |
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123 | for j := 0; j < ConsPerChan * Channels; j++{ |
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124 | <-consJoin |
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125 | } |
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126 | |
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127 | |
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128 | if cons_check != prod_check { |
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129 | fmt.Println("\nChecksum mismatch: Cons: %d, Prods: %d", cons_check, prod_check) |
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130 | } |
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131 | fmt.Println(total_operations) |
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132 | } |
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