forked from mmcgrana/gobyexample
-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy pathworker-pools.html
231 lines (185 loc) · 12.3 KB
/
worker-pools.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example မြန်မာဘာသာ: Worker Pools</title>
<link rel=stylesheet href="site.css">
</head>
<script>
onkeydown = (e) => {
if (e.key == "ArrowLeft") {
window.location.href = 'tickers';
}
if (e.key == "ArrowRight") {
window.location.href = 'waitgroups';
}
}
</script>
<body>
<div class="example" id="worker-pools">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Worker Pools</h2>
<table>
<tr>
<td class="docs">
<p>ဒီဥပမာမှာ goroutine တွေနဲ့ channel တွေကို သုံးပြီး
<em>worker pool</em> တစ်ခုကို ဘယ်လို အကောင်အထည်ဖော်မလဲဆိုတာကို ကြည့်ကြပါမယ်။</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="https://go.dev/play/p/D44_w5jrGKt"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">"fmt"</span>
<span class="s">"time"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒါက worker ပါ၊ ကျွန်တော်တို့က ဒီ worker ရဲ့ instance အများကြီးကို
တပြိုင်နက်တည်း run မှာပါ။ ဒီ worker တွေက <code>jobs</code> channel ကနေ
အလုပ်တွေကို လက်ခံပြီး ရလဒ်တွေကို <code>results</code> channel ဆီ ပို့ပါလိမ့်မယ်။
expensive task အလုပ်တစ်ခုကို simulate လုပ်ဖို့ task တစ်ခုအတွက်
တစ်စက္ကန့် sleep ပါလိမ့်မယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="nf">worker</span><span class="p">(</span><span class="nx">id</span> <span class="kt">int</span><span class="p">,</span> <span class="nx">jobs</span> <span class="o"><-</span><span class="kd">chan</span> <span class="kt">int</span><span class="p">,</span> <span class="nx">results</span> <span class="kd">chan</span><span class="o"><-</span> <span class="kt">int</span><span class="p">)</span> <span class="p">{</span>
<span class="k">for</span> <span class="nx">j</span> <span class="o">:=</span> <span class="k">range</span> <span class="nx">jobs</span> <span class="p">{</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"worker"</span><span class="p">,</span> <span class="nx">id</span><span class="p">,</span> <span class="s">"started job"</span><span class="p">,</span> <span class="nx">j</span><span class="p">)</span>
<span class="nx">time</span><span class="p">.</span><span class="nf">Sleep</span><span class="p">(</span><span class="nx">time</span><span class="p">.</span><span class="nx">Second</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"worker"</span><span class="p">,</span> <span class="nx">id</span><span class="p">,</span> <span class="s">"finished job"</span><span class="p">,</span> <span class="nx">j</span><span class="p">)</span>
<span class="nx">results</span> <span class="o"><-</span> <span class="nx">j</span> <span class="o">*</span> <span class="mi">2</span>
<span class="p">}</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ကျွန်တော်တို့ရဲ့ worker pool ကို သုံးဖို့ဆိုရင် သူတို့စီ အလုပ်တွေပို့ပြီး
သူတို့ရဲ့ ရလဒ်တွေကို စုစည်းဖို့ လိုပါတယ်။ ဒီအတွက် channel နှစ်ခု လုပ်ပါမယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">const</span> <span class="nx">numJobs</span> <span class="p">=</span> <span class="mi">5</span>
<span class="nx">jobs</span> <span class="o">:=</span> <span class="nb">make</span><span class="p">(</span><span class="kd">chan</span> <span class="kt">int</span><span class="p">,</span> <span class="nx">numJobs</span><span class="p">)</span>
<span class="nx">results</span> <span class="o">:=</span> <span class="nb">make</span><span class="p">(</span><span class="kd">chan</span> <span class="kt">int</span><span class="p">,</span> <span class="nx">numJobs</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒါက worker သုံးခုကို စတင်ပါတယ်၊ ဒါပေမယ့် အစပိုင်းမှာ အလုပ်မရှိသေးတဲ့အတွက်
block ဖြစ်နေပါလိမ့်မယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="k">for</span> <span class="nx">w</span> <span class="o">:=</span> <span class="mi">1</span><span class="p">;</span> <span class="nx">w</span> <span class="o"><=</span> <span class="mi">3</span><span class="p">;</span> <span class="nx">w</span><span class="o">++</span> <span class="p">{</span>
<span class="k">go</span> <span class="nf">worker</span><span class="p">(</span><span class="nx">w</span><span class="p">,</span> <span class="nx">jobs</span><span class="p">,</span> <span class="nx">results</span><span class="p">)</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီမှာ အလုပ် 5 ခု ပို့ပြီးတော့ အဲဒီ channel ကို <code>close</code> လုပ်ပါတယ်။
ဒါက ရှိသမျှအလုပ်အားလုံး ပို့ပြီးပြီဆိုတာကို ညွှန်ပြတာပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="k">for</span> <span class="nx">j</span> <span class="o">:=</span> <span class="mi">1</span><span class="p">;</span> <span class="nx">j</span> <span class="o"><=</span> <span class="nx">numJobs</span><span class="p">;</span> <span class="nx">j</span><span class="o">++</span> <span class="p">{</span>
<span class="nx">jobs</span> <span class="o"><-</span> <span class="nx">j</span>
<span class="p">}</span>
<span class="nb">close</span><span class="p">(</span><span class="nx">jobs</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>နောက်ဆုံးမှာ အလုပ်အားလုံးရဲ့ ရလဒ်တွေကို စုစည်းပါတယ်။
ဒါက worker goroutine တွေ ပြီးဆုံးသွားပြီဆိုတာကိုလည်း သေချာစေပါတယ်။
Goroutine အများကြီးကို စောင့်ဆိုင်းဖို့ နောက်ထပ်နည်းလမ်းတစ်ခုကတော့
<a href="waitgroups">WaitGroup</a> ကို သုံးတာပါ။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="k">for</span> <span class="nx">a</span> <span class="o">:=</span> <span class="mi">1</span><span class="p">;</span> <span class="nx">a</span> <span class="o"><=</span> <span class="nx">numJobs</span><span class="p">;</span> <span class="nx">a</span><span class="o">++</span> <span class="p">{</span>
<span class="o"><-</span><span class="nx">results</span>
<span class="p">}</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
<p>ကျွန်တော်တို့ run နေတဲ့ပရိုဂရမ်က
အလုပ် 5 ခုကို worker တွေက
executed နေပါတယ်။
စုစုပေါင်း အလုပ်ချိန် 5 စက္ကန့်လောက်
ရှိသော်လည်း ပရိုဂရမ်က
2 စက္ကန့်လောက်ပဲ ကြာပါတယ်။
ဘာကြောင့်လဲဆိုတော့
worker 3 ခုက
တပြိုင်နက်တည်း အလုပ်လုပ်နေလို့ပါ။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="gp">$</span> time go run worker-pools.go
<span class="go">worker 1 started job 1
</span><span class="go">worker 2 started job 2
</span><span class="go">worker 3 started job 3
</span><span class="go">worker 1 finished job 1
</span><span class="go">worker 1 started job 4
</span><span class="go">worker 2 finished job 2
</span><span class="go">worker 2 started job 5
</span><span class="go">worker 3 finished job 3
</span><span class="go">worker 1 finished job 4
</span><span class="go">worker 2 finished job 5</span></pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code">
<pre class="chroma"><span class="go">real 0m2.358s</span></pre>
</td>
</tr>
</table>
<p class="next">
နောက်ဥပမာ: <a href="waitgroups">WaitGroups</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> နှင့် <a href="https://eli.thegreenplace.net">Eli Bendersky</a> | <a href="https://github.com/mmcgrana/gobyexample">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func worker(id int, jobs \u003C-chan int, results chan\u003C- int) {\u000A for j :\u003D range jobs {\u000A fmt.Println(\"worker\", id, \"started job\", j)\u000A time.Sleep(time.Second)\u000A fmt.Println(\"worker\", id, \"finished job\", j)\u000A results \u003C- j * 2\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' const numJobs \u003D 5\u000A jobs :\u003D make(chan int, numJobs)\u000A results :\u003D make(chan int, numJobs)\u000A');codeLines.push(' for w :\u003D 1; w \u003C\u003D 3; w++ {\u000A go worker(w, jobs, results)\u000A }\u000A');codeLines.push(' for j :\u003D 1; j \u003C\u003D numJobs; j++ {\u000A jobs \u003C- j\u000A }\u000A close(jobs)\u000A');codeLines.push(' for a :\u003D 1; a \u003C\u003D numJobs; a++ {\u000A \u003C-results\u000A }\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>
</html>