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
|
<html>
<head>
<title>ArrayBuffer External Memory test</title>
<script>
var log;
function print(message, color)
{
var paragraph = document.createElement("div");
paragraph.appendChild(document.createTextNode(message));
paragraph.style.fontFamily = "monospace";
if (color)
paragraph.style.color = color;
log.appendChild(paragraph);
}
function pass(msg)
{
print("PASS: " + msg, "green");
}
function fail(msg)
{
print("FAIL: " + msg, "red");
}
var KB = 1024;
var MB = KB * KB;
var noise = KB;
function externalMemory() {
return getV8Statistics().amount_of_external_allocated_memory;
}
function collectGarbage() {
for (var i = 0; i < 10; i++) gc();
}
function allocationsThatIncreaseExternalMemory() {
function test(expression) {
var before = externalMemory();
(function () { eval(expression); }) ();
var now = externalMemory();
if (now < before + MB - noise) {
fail(expression + " did not increase the amount of external memory (" +
before + ", " + now + ").");
} else {
pass(expression + " increased the amount of external memory.");
}
collectGarbage();
var after = externalMemory();
if (after > now + noise) {
fail("Garbage collection after " + expression +
" did not return the amount of external memory to the initial value (" +
now + ", " + after + ").");
} else {
pass("Garbage collection after " + expression +
" returned the amount of external memory to the initial value.");
}
}
test("(new ArrayBuffer(MB))");
test("(new Float32Array(MB))");
test("(new Float64Array(MB))");
test("(new Int8Array(MB))");
test("(new Int16Array(MB))");
test("(new Int32Array(MB))");
test("(new Uint8Array(MB))");
test("(new Uint16Array(MB))");
test("(new Uint32Array(MB))");
var largeJSArray = [];
for (var i = 0; i < MB; i++) largeJSArray.push(i);
test("(new Float32Array(largeJSArray))");
test("(new Float64Array(largeJSArray))");
test("(new Int8Array(largeJSArray))");
test("(new Int16Array(largeJSArray))");
test("(new Int32Array(largeJSArray))");
test("(new Uint8Array(largeJSArray))");
test("(new Uint16Array(largeJSArray))");
test("(new Uint32Array(largeJSArray))");
var int8Array = new Int8Array(MB);
test("(new Float32Array(int8Array))");
test("(new Float64Array(int8Array))");
test("(new Int8Array(int8Array))");
test("(new Int16Array(int8Array))");
test("(new Int32Array(int8Array))");
test("(new Uint8Array(int8Array))");
test("(new Uint16Array(int8Array))");
test("(new Uint32Array(int8Array))");
}
function allocationsThatDoNotChangeExternalMemory() {
function test(expression) {
var before = externalMemory();
(function () { eval(expression); }) ();
var now = externalMemory();
if (now > before + noise) {
fail(expression + " increased the amount of external memory (" + before + ", " + now + ").");
} else {
pass(expression + " did not increase the amount of external memory.");
}
collectGarbage();
var after = externalMemory();
if (after < now - noise) {
fail("Garbage collection after " + expression + " decreased the amount of external memory (" +
now + ", " + after + ").");
} else {
pass("Garbage collection after " + expression +
" did not decrease the amount of external memory.");
}
}
var arrayBuffer = new ArrayBuffer(MB);
test("(new Float32Array(arrayBuffer))");
test("(new Float64Array(arrayBuffer))");
test("(new Int8Array(arrayBuffer))");
test("(new Int16Array(arrayBuffer))");
test("(new Int32Array(arrayBuffer))");
test("(new Uint8Array(arrayBuffer))");
test("(new Uint16Array(arrayBuffer))");
test("(new Uint32Array(arrayBuffer))");
var int8Array = new Int8Array(MB);
test("(new Float32Array(int8Array.buffer))");
test("(new Float64Array(int8Array.buffer))");
test("(new Int8Array(int8Array.buffer))");
test("(new Int16Array(int8Array.buffer))");
test("(new Int32Array(int8Array.buffer))");
test("(new Uint8Array(int8Array.buffer))");
test("(new Uint16Array(int8Array.buffer))");
test("(new Uint32Array(int8Array.buffer))");
}
function transfersThatDecreaseExternalMemory() {
var workerSource =
"function externalMemory() {\n" +
" return getV8Statistics().amount_of_external_allocated_memory;\n" +
"}\n" +
"var KB = 1024;\n" +
"var MB = KB * KB;\n" +
"var noise = KB;\n" +
"self.onmessage = function(e) {\n" +
" var before = externalMemory();\n" +
" e.data;\n" +
" var after = externalMemory();\n" +
" if (after > before + MB - noise) {\n" +
" self.postMessage('PASS: Amount of external memory increased.');\n" +
" } else {\n" +
" self.postMessage('FAIL: Amount of external memory did not increase.');\n" +
" }\n" +
"}\n";
var blob = new Blob([workerSource]);
var worker = new Worker(window.webkitURL.createObjectURL(blob));
worker.onmessage = function (e) {
print("message from worker: " + e.data, "blue");
}
function test(expression)
{
var buffer = eval(expression);
try {
var before = externalMemory();
worker.postMessage(buffer, [buffer]);
var now = externalMemory();
if (now > before - MB + noise) {
fail("Transfer of " + expression + " did not decrease the amount of external memory (" +
before + ", " + now + ").");
} else {
pass("Transfer of " + expression + " decreased the amount of external memory.");
}
collectGarbage();
var after = externalMemory();
if (after < now - noise) {
fail("Garbage collection after transfer of " + expression +
" decreased the amount of external memory (" + now + ", " + after + ").");
} else {
pass("Garbage collection after transfer of " + expression +
" did not decrease the amount of external memory.");
}
} catch (e) {
fail("Transfer of " + name + ": could not webkitPostMessage: " + e);
return false;
}
return true;
}
test("(new ArrayBuffer(MB))");
test("(new Float32Array(MB)).buffer");
test("(new Float64Array(MB)).buffer");
test("(new Int8Array(MB)).buffer");
test("(new Int16Array(MB)).buffer");
test("(new Int32Array(MB)).buffer");
test("(new Uint8Array(MB)).buffer");
test("(new Uint16Array(MB)).buffer");
test("(new Uint32Array(MB)).buffer");
}
function runAll() {
log = document.getElementById("log1");
if (typeof gc == "undefined" || typeof getV8Statistics == "undefined") {
print("Run chrome browser with --js-flags='--expose_gc --track_gc_object_stats'", "red");
} else {
allocationsThatIncreaseExternalMemory();
collectGarbage();
allocationsThatDoNotChangeExternalMemory();
collectGarbage();
log = document.getElementById("log2");
transfersThatDecreaseExternalMemory();
collectGarbage();
}
}
</script>
</head>
<body onload="runAll()">
<p>This test checks that allocation and deallocation of typed arrays correctly
adjusts the amount of external memory in V8.</p>
<div id='log1'></div>
<p>This test checks that transfer of an array buffer to worker decreases amount of
external memory in the main V8 isolate.</p>
<div id='log2'></div>
</body>
</html>
|
