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
|
#include "kernel/fcntl.h"
#include "kernel/param.h"
#include "kernel/types.h"
#include "kernel/stat.h"
#include "kernel/riscv.h"
#include "kernel/fs.h"
#include "user/user.h"
void test0();
void test1();
#define SZ 4096
char buf[SZ];
int
main(int argc, char *argv[])
{
test0();
test1();
exit(0);
}
void
createfile(char *file, int nblock)
{
int fd;
char buf[BSIZE];
int i;
fd = open(file, O_CREATE | O_RDWR);
if(fd < 0){
printf("createfile %s failed\n", file);
exit(-1);
}
for(i = 0; i < nblock; i++) {
if(write(fd, buf, sizeof(buf)) != sizeof(buf)) {
printf("write %s failed\n", file);
exit(-1);
}
}
close(fd);
}
void
readfile(char *file, int nbytes, int inc)
{
char buf[BSIZE];
int fd;
int i;
if(inc > BSIZE) {
printf("readfile: inc too large\n");
exit(-1);
}
if ((fd = open(file, O_RDONLY)) < 0) {
printf("readfile open %s failed\n", file);
exit(-1);
}
for (i = 0; i < nbytes; i += inc) {
if(read(fd, buf, inc) != inc) {
printf("read %s failed for block %d (%d)\n", file, i, nbytes);
exit(-1);
}
}
close(fd);
}
int ntas(int print)
{
int n;
char *c;
if (statistics(buf, SZ) <= 0) {
fprintf(2, "ntas: no stats\n");
}
c = strchr(buf, '=');
n = atoi(c+2);
if(print)
printf("%s", buf);
return n;
}
// Test reading small files concurrently
void
test0()
{
char file[2];
char dir[2];
enum { N = 10, NCHILD = 3 };
int m, n;
dir[0] = '0';
dir[1] = '\0';
file[0] = 'F';
file[1] = '\0';
printf("start test0\n");
for(int i = 0; i < NCHILD; i++){
dir[0] = '0' + i;
mkdir(dir);
if (chdir(dir) < 0) {
printf("chdir failed\n");
exit(1);
}
unlink(file);
createfile(file, N);
if (chdir("..") < 0) {
printf("chdir failed\n");
exit(1);
}
}
m = ntas(0);
for(int i = 0; i < NCHILD; i++){
dir[0] = '0' + i;
int pid = fork();
if(pid < 0){
printf("fork failed");
exit(-1);
}
if(pid == 0){
if (chdir(dir) < 0) {
printf("chdir failed\n");
exit(1);
}
readfile(file, N*BSIZE, 1);
exit(0);
}
}
for(int i = 0; i < NCHILD; i++){
wait(0);
}
printf("test0 results:\n");
n = ntas(1);
if (n-m < 500)
printf("test0: OK\n");
else
printf("test0: FAIL\n");
}
// Test bcache evictions by reading a large file concurrently
void test1()
{
char file[3];
enum { N = 200, BIG=100, NCHILD=2 };
printf("start test1\n");
file[0] = 'B';
file[2] = '\0';
for(int i = 0; i < NCHILD; i++){
file[1] = '0' + i;
unlink(file);
if (i == 0) {
createfile(file, BIG);
} else {
createfile(file, 1);
}
}
for(int i = 0; i < NCHILD; i++){
file[1] = '0' + i;
int pid = fork();
if(pid < 0){
printf("fork failed");
exit(-1);
}
if(pid == 0){
if (i==0) {
for (i = 0; i < N; i++) {
readfile(file, BIG*BSIZE, BSIZE);
}
unlink(file);
exit(0);
} else {
for (i = 0; i < N*20; i++) {
readfile(file, 1, BSIZE);
}
unlink(file);
}
exit(0);
}
}
for(int i = 0; i < NCHILD; i++){
wait(0);
}
printf("test1 OK\n");
}
|
