1 | use std::io::{self, Write}; |
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2 | use std::ptr; |
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3 | use std::sync::Arc; |
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4 | use std::sync::atomic::{AtomicU64, AtomicBool, Ordering}; |
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5 | use std::time::{Instant,Duration}; |
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6 | use std::thread::{self, ThreadId}; |
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7 | |
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8 | use tokio::runtime::Builder; |
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9 | use tokio::sync; |
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10 | use tokio::time; |
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11 | |
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12 | use clap::{Arg, App, ArgMatches}; |
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13 | use isatty::stdout_isatty; |
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14 | use num_format::{Locale, ToFormattedString}; |
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15 | use rand::Rng; |
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16 | |
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17 | // ================================================== |
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18 | struct BenchData { |
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19 | clock_mode: bool, |
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20 | stop: AtomicBool, |
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21 | stop_count: u64, |
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22 | duration: f64, |
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23 | threads_left: AtomicU64, |
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24 | } |
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25 | |
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26 | impl BenchData { |
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27 | fn new(options: ArgMatches, nthreads: usize) -> BenchData { |
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28 | let (clock_mode, stop_count, duration) = if options.is_present("iterations") { |
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29 | (false, |
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30 | options.value_of("iterations").unwrap().parse::<u64>().unwrap(), |
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31 | -1.0) |
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32 | } else { |
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33 | (true, |
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34 | std::u64::MAX, |
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35 | options.value_of("duration").unwrap().parse::<f64>().unwrap()) |
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36 | }; |
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37 | |
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38 | BenchData{ |
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39 | clock_mode: clock_mode, |
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40 | stop: AtomicBool::new(false), |
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41 | stop_count: stop_count, |
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42 | duration: duration, |
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43 | threads_left: AtomicU64::new(nthreads as u64), |
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44 | } |
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45 | } |
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46 | } |
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47 | |
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48 | async fn wait(bench: &BenchData, start: &Instant, is_tty: bool) { |
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49 | loop { |
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50 | time::sleep(Duration::from_micros(100000)).await; |
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51 | let delta = start.elapsed(); |
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52 | if is_tty { |
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53 | print!(" {:.1}\r", delta.as_secs_f32()); |
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54 | io::stdout().flush().unwrap(); |
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55 | } |
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56 | if bench.clock_mode && delta >= Duration::from_secs_f64(bench.duration) { |
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57 | break; |
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58 | } |
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59 | else if !bench.clock_mode && bench.threads_left.load(Ordering::Relaxed) == 0 { |
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60 | break; |
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61 | } |
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62 | } |
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63 | } |
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64 | |
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65 | // ================================================== |
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66 | struct MyData { |
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67 | data: Vec<u64>, |
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68 | ttid: ThreadId, |
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69 | _id: usize, |
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70 | } |
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71 | |
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72 | impl MyData { |
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73 | fn new(id: usize, size: usize) -> MyData { |
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74 | MyData { |
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75 | data: vec![0; size], |
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76 | ttid: thread::current().id(), |
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77 | _id: id, |
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78 | } |
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79 | } |
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80 | |
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81 | fn moved(&mut self, ttid: ThreadId) -> u64 { |
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82 | if self.ttid == ttid { |
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83 | return 0; |
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84 | } |
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85 | self.ttid = ttid; |
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86 | return 1; |
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87 | } |
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88 | |
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89 | fn access(&mut self, idx: usize) { |
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90 | let l = self.data.len(); |
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91 | self.data[idx % l] += 1; |
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92 | } |
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93 | } |
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94 | |
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95 | struct MyDataPtr { |
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96 | ptr: *mut MyData, |
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97 | } |
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98 | |
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99 | unsafe impl std::marker::Send for MyDataPtr{} |
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100 | |
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101 | // ================================================== |
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102 | struct MyCtx { |
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103 | s: sync::Semaphore, |
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104 | d: MyDataPtr, |
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105 | ttid: ThreadId, |
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106 | _id: usize, |
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107 | } |
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108 | |
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109 | impl MyCtx { |
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110 | fn new(d: *mut MyData, id: usize) -> MyCtx { |
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111 | MyCtx { |
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112 | s: sync::Semaphore::new(0), |
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113 | d: MyDataPtr{ ptr: d }, |
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114 | ttid: thread::current().id(), |
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115 | _id: id |
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116 | } |
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117 | } |
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118 | |
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119 | fn moved(&mut self, ttid: ThreadId) -> u64 { |
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120 | if self.ttid == ttid { |
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121 | return 0; |
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122 | } |
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123 | self.ttid = ttid; |
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124 | return 1; |
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125 | } |
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126 | } |
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127 | // ================================================== |
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128 | // Atomic object where a single thread can wait |
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129 | // May exchanges data |
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130 | struct MySpot { |
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131 | ptr: AtomicU64, |
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132 | _id: usize, |
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133 | } |
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134 | |
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135 | impl MySpot { |
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136 | fn new(id: usize) -> MySpot { |
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137 | let r = MySpot{ |
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138 | ptr: AtomicU64::new(0), |
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139 | _id: id, |
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140 | }; |
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141 | r |
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142 | } |
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143 | |
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144 | fn one() -> u64 { |
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145 | 1 |
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146 | } |
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147 | |
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148 | // Main handshake of the code |
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149 | // Single seat, first thread arriving waits |
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150 | // Next threads unblocks current one and blocks in its place |
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151 | // if share == true, exchange data in the process |
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152 | async fn put( &self, ctx: &mut MyCtx, data: MyDataPtr, share: bool) -> (*mut MyData, bool) { |
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153 | { |
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154 | // Attempt to CAS our context into the seat |
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155 | let raw = { |
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156 | loop { |
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157 | let expected = self.ptr.load(Ordering::Relaxed) as u64; |
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158 | if expected == MySpot::one() { // Seat is closed, return |
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159 | let r: *const MyData = ptr::null(); |
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160 | return (r as *mut MyData, true); |
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161 | } |
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162 | let got = self.ptr.compare_and_swap(expected, ctx as *mut MyCtx as u64, Ordering::SeqCst); |
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163 | if got == expected { |
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164 | break expected;// We got the seat |
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165 | } |
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166 | } |
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167 | }; |
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168 | |
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169 | // If we aren't the fist in, wake someone |
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170 | if raw != 0 { |
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171 | let val: &mut MyCtx = unsafe{ &mut *(raw as *mut MyCtx) }; |
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172 | // If we are sharing, give them our data |
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173 | if share { |
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174 | val.d.ptr = data.ptr; |
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175 | } |
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176 | |
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177 | // Wake them up |
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178 | val.s.add_permits(1); |
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179 | } |
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180 | } |
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181 | |
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182 | // Block once on the seat |
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183 | ctx.s.acquire().await.forget(); |
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184 | |
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185 | // Someone woke us up, get the new data |
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186 | let ret = ctx.d.ptr; |
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187 | return (ret, false); |
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188 | } |
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189 | |
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190 | // Shutdown the spot |
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191 | // Wake current thread and mark seat as closed |
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192 | fn release(&self) { |
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193 | let val = self.ptr.swap(MySpot::one(), Ordering::SeqCst); |
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194 | if val == 0 { |
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195 | return |
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196 | } |
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197 | |
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198 | // Someone was there, release them |
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199 | unsafe{ &mut *(val as *mut MyCtx) }.s.add_permits(1) |
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200 | } |
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201 | } |
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202 | |
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203 | // ================================================== |
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204 | // Struct for result, Go doesn't support passing tuple in channels |
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205 | struct Result { |
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206 | count: u64, |
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207 | gmigs: u64, |
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208 | dmigs: u64, |
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209 | } |
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210 | |
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211 | impl Result { |
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212 | fn new() -> Result { |
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213 | Result{ count: 0, gmigs: 0, dmigs: 0} |
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214 | } |
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215 | |
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216 | fn add(&mut self, o: Result) { |
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217 | self.count += o.count; |
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218 | self.gmigs += o.gmigs; |
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219 | self.dmigs += o.dmigs; |
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220 | } |
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221 | } |
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222 | |
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223 | // ================================================== |
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224 | // Random number generator, Go's native one is to slow and global |
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225 | fn __xorshift64( state: &mut u64 ) -> usize { |
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226 | let mut x = *state; |
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227 | x ^= x << 13; |
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228 | x ^= x >> 7; |
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229 | x ^= x << 17; |
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230 | *state = x; |
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231 | x as usize |
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232 | } |
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233 | |
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234 | // ================================================== |
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235 | // Do some work by accessing 'cnt' cells in the array |
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236 | fn work(data: &mut MyData, cnt: u64, state : &mut u64) { |
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237 | for _ in 0..cnt { |
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238 | data.access(__xorshift64(state)) |
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239 | } |
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240 | } |
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241 | |
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242 | async fn local(start: Arc<sync::Barrier>, idata: MyDataPtr, spots : Arc<Vec<MySpot>>, cnt: u64, share: bool, id: usize, bench: Arc<BenchData>) -> Result{ |
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243 | let mut state = rand::thread_rng().gen::<u64>(); |
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244 | let mut data = idata; |
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245 | let mut ctx = MyCtx::new(data.ptr, id); |
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246 | let _size = unsafe{ &mut *data.ptr }.data.len(); |
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247 | |
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248 | // Prepare results |
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249 | let mut r = Result::new(); |
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250 | |
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251 | // Wait for start |
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252 | start.wait().await; |
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253 | |
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254 | // Main loop |
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255 | loop { |
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256 | // Touch our current data, write to invalidate remote cache lines |
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257 | work(unsafe{ &mut *data.ptr }, cnt, &mut state); |
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258 | |
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259 | // Wait on a random spot |
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260 | let i = (__xorshift64(&mut state) as usize) % spots.len(); |
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261 | let closed = { |
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262 | let (d, c) = spots[i].put(&mut ctx, data, share).await; |
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263 | data = MyDataPtr{ ptr: d }; |
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264 | c |
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265 | }; |
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266 | |
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267 | // Check if the experiment is over |
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268 | if closed { break } // yes, spot was closed |
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269 | if bench.clock_mode && bench.stop.load(Ordering::Relaxed) { break } // yes, time's up |
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270 | if !bench.clock_mode && r.count >= bench.stop_count { break } // yes, iterations reached |
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271 | |
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272 | assert_ne!(data.ptr as *const MyData, ptr::null()); |
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273 | |
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274 | let d = unsafe{ &mut *data.ptr }; |
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275 | |
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276 | // Check everything is consistent |
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277 | debug_assert_eq!(d.data.len(), _size); |
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278 | |
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279 | // write down progress and check migrations |
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280 | let ttid = thread::current().id(); |
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281 | r.count += 1; |
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282 | r.gmigs += ctx .moved(ttid); |
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283 | r.dmigs += d.moved(ttid); |
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284 | } |
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285 | |
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286 | bench.threads_left.fetch_sub(1, Ordering::SeqCst); |
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287 | r |
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288 | } |
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289 | |
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290 | |
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291 | // ================================================== |
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292 | fn main() { |
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293 | let options = App::new("Locality Tokio") |
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294 | .arg(Arg::with_name("duration") .short("d").long("duration") .takes_value(true).default_value("5").help("Duration of the experiments in seconds")) |
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295 | .arg(Arg::with_name("iterations").short("i").long("iterations").takes_value(true).conflicts_with("duration").help("Number of iterations of the experiments")) |
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296 | .arg(Arg::with_name("nthreads") .short("t").long("nthreads") .takes_value(true).default_value("1").help("Number of threads to use")) |
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297 | .arg(Arg::with_name("nprocs") .short("p").long("nprocs") .takes_value(true).default_value("1").help("Number of processors to use")) |
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298 | .arg(Arg::with_name("size") .short("w").long("worksize") .takes_value(true).default_value("2").help("Size of the array for each threads, in words (64bit)")) |
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299 | .arg(Arg::with_name("work") .short("c").long("workcnt") .takes_value(true).default_value("2").help("Number of words to touch when working (random pick, cells can be picked more than once)")) |
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300 | .arg(Arg::with_name("share") .short("s").long("share") .takes_value(true).default_value("true").help("Pass the work data to the next thread when blocking")) |
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301 | .get_matches(); |
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302 | |
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303 | let nthreads = options.value_of("nthreads").unwrap().parse::<usize>().unwrap(); |
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304 | let nprocs = options.value_of("nprocs").unwrap().parse::<usize>().unwrap(); |
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305 | let wsize = options.value_of("size").unwrap().parse::<usize>().unwrap(); |
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306 | let wcnt = options.value_of("work").unwrap().parse::<u64>().unwrap(); |
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307 | let share = options.value_of("share").unwrap().parse::<bool>().unwrap(); |
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308 | |
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309 | // Check params |
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310 | if ! (nthreads > nprocs) { |
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311 | panic!("Must have more threads than procs"); |
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312 | } |
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313 | |
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314 | let s = (1000000 as u64).to_formatted_string(&Locale::en); |
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315 | assert_eq!(&s, "1,000,000"); |
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316 | |
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317 | let bench = Arc::new(BenchData::new(options, nprocs)); |
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318 | let mut results = Result::new(); |
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319 | |
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320 | let mut elapsed : std::time::Duration = std::time::Duration::from_secs(0); |
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321 | |
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322 | let mut data_arrays : Vec<MyData> = (0..nthreads).map(|i| MyData::new(i, wsize)).rev().collect(); |
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323 | let spots : Arc<Vec<MySpot>> = Arc::new((0..nthreads - nprocs).map(|i| MySpot::new(i)).rev().collect()); |
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324 | let barr = Arc::new(sync::Barrier::new(nthreads + 1)); |
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325 | |
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326 | let runtime = Builder::new_multi_thread() |
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327 | .worker_threads(nprocs) |
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328 | .enable_all() |
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329 | .build() |
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330 | .unwrap(); |
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331 | |
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332 | runtime.block_on(async |
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333 | { |
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334 | let thrds: Vec<_> = (0..nthreads).map(|i| { |
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335 | debug_assert!(i < data_arrays.len()); |
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336 | |
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337 | runtime.spawn(local( |
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338 | barr.clone(), |
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339 | MyDataPtr{ ptr: &mut data_arrays[i] }, |
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340 | spots.clone(), |
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341 | wcnt, |
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342 | share, |
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343 | i, |
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344 | bench.clone(), |
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345 | )) |
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346 | }).collect(); |
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347 | |
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348 | |
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349 | println!("Starting"); |
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350 | |
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351 | let is_tty = stdout_isatty(); |
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352 | let start = Instant::now(); |
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353 | barr.wait().await; |
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354 | |
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355 | wait(&bench, &start, is_tty).await; |
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356 | |
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357 | bench.stop.store(true, Ordering::SeqCst); |
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358 | elapsed = start.elapsed(); |
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359 | |
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360 | println!("\nDone"); |
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361 | |
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362 | // release all the blocked threads |
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363 | for s in &* spots { |
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364 | s.release(); |
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365 | } |
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366 | |
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367 | println!("Threads released"); |
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368 | |
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369 | // Join and accumulate results |
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370 | for t in thrds { |
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371 | results.add( t.await.unwrap() ); |
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372 | } |
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373 | |
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374 | println!("Threads joined"); |
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375 | } |
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376 | ); |
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377 | |
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378 | println!("Duration (ms) : {}", (elapsed.as_millis()).to_formatted_string(&Locale::en)); |
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379 | println!("Number of processors : {}", (nprocs).to_formatted_string(&Locale::en)); |
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380 | println!("Number of threads : {}", (nthreads).to_formatted_string(&Locale::en)); |
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381 | println!("Work size (64bit words): {}", (wsize).to_formatted_string(&Locale::en)); |
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382 | println!("Total Operations(ops) : {:>15}", (results.count).to_formatted_string(&Locale::en)); |
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383 | println!("Total G Migrations : {:>15}", (results.gmigs).to_formatted_string(&Locale::en)); |
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384 | println!("Total D Migrations : {:>15}", (results.dmigs).to_formatted_string(&Locale::en)); |
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385 | println!("Ops per second : {:>15}", (((results.count as f64) / elapsed.as_secs() as f64) as u64).to_formatted_string(&Locale::en)); |
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386 | println!("ns per ops : {:>15}", ((elapsed.as_nanos() as f64 / results.count as f64) as u64).to_formatted_string(&Locale::en)); |
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387 | println!("Ops per threads : {:>15}", (results.count / nthreads as u64).to_formatted_string(&Locale::en)); |
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388 | println!("Ops per procs : {:>15}", (results.count / nprocs as u64).to_formatted_string(&Locale::en)); |
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389 | println!("Ops/sec/procs : {:>15}", ((((results.count as f64) / nprocs as f64) / elapsed.as_secs() as f64) as u64).to_formatted_string(&Locale::en)); |
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390 | println!("ns per ops/procs : {:>15}", ((elapsed.as_nanos() as f64 / (results.count as f64 / nprocs as f64)) as u64).to_formatted_string(&Locale::en)); |
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391 | } |
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