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
|
// $Id$
#include "client.h"
ACE_RCSID(stress_testing, http_tester, "$Id$")
int Client_Parameters::tcp_nodelay;
int Client_Parameters::sockbufsiz;
Stats *Client_Parameters::stats;
static void *
client_thread(void *data)
{
Client_Parameters *cp = (Client_Parameters *) data;
float latency = 0, throughput;
URL *u = cp->url;
// Check for presence of protocol, hostname and filename.
if(!(u->get_protocol() && u->get_hostname() && u->get_filename())) {
cerr << "Invalid URL" << endl;
return NULL;
}
cp->stats->i_have_started(cp->id);
// Attempt connection
connection webserver;
if(webserver.connect(u->get_hostname(), cp->tcp_nodelay, cp->sockbufsiz)) return NULL;
// Send the request now.
char request[BUFSIZ];
ACE_Profile_Timer throughput_timer, latency_timer;
throughput_timer.start();
latency_timer.start();
ACE_OS::sprintf(request,"GET /%s HTTP/1.0\r\n\r\n",u->get_filename());
webserver.write_n(request, strlen(request)) ;
char buffer[BUFSIZ];
ssize_t num_read = 0, total_read = 0;
unsigned int first_time = 1;
for(;;) {
num_read = webserver.read(buffer, sizeof buffer);
if(first_time) {
ACE_Profile_Timer::ACE_Elapsed_Time et;
latency_timer.stop();
latency_timer.elapsed_time(et);
latency = et.real_time;
first_time = 0;
}
if(num_read <= 0)
break;
total_read += num_read;
}
cp->stats->i_am_done(cp->id);
ACE_Profile_Timer::ACE_Elapsed_Time et;
throughput_timer.stop();
throughput_timer.elapsed_time(et);
throughput = (8 * total_read/et.real_time) / (1000 * 1000); //pow(10,6) ;
cp->stats->log(cp->id, throughput, latency);
webserver.close();
return NULL;
}
int driver(char *id, int total_num, float requests_sec, char *url1, float p1, char *url2, float p2, char *url3, float p3, int tcp_nodelay, int sockbufsiz) {
// construct the client parameters packet
Client_Parameters::tcp_nodelay = tcp_nodelay;
Client_Parameters::sockbufsiz = sockbufsiz;
Client_Parameters::stats = new Stats(total_num);
int missed_deadlines = 0;
// sleep_time is in microseconds, and requests_sec is per second, hence the pow(10,6)
float sleep_time = (1/requests_sec) * (1000.0 * 1000.0); // pow(10,6);
float delta = 0;
srand(time(NULL));
for(int i = 0; i < total_num; i++) { // i is used as a id for threads
ACE_Profile_Timer timer;
if(sleep_time < delta)
{
// cerr << "Requested rate is too high, sleep_time == " << sleep_time << ", and delta = " << delta << ", after " << i << " iterations! " << endl;
missed_deadlines++;
}
else
{
ACE_Time_Value tv(0, (long int) (sleep_time - delta));
ACE_OS::sleep(tv);
timer.start();
}
Client_Parameters *cp = new Client_Parameters(i);
double r = ((double)rand()/(double)RAND_MAX);
// cerr << " choosing between " << url1 << url2 << url3 << " with r == " << r;
if(r <= p1) cp->url = new URL(url1);
if( (r > p1) && (r <= (p1 + p2))) cp->url = new URL(url2);
if( (r > (p1 + p2)) && (r <= p1 + p2 + p3)) cp->url = new URL(url3);
// cerr << "The URL being requested is " << cp->url->get_filename() << endl;
(ACE_Thread_Manager::instance ())->spawn(client_thread, (void *) cp);
timer.stop();
ACE_Profile_Timer::ACE_Elapsed_Time et;
timer.elapsed_time(et);
delta = ( (0.4 * fabs(et.real_time * (1000 * 1000))) + (0.6 * delta) ); // pow(10,6)
}
// Join the other threads..
(ACE_Thread_Manager::instance ())->wait();
// Now output the data for this test
cout << id;
Client_Parameters::stats->output();
cout << endl;
if (missed_deadlines != 0)
{
cout << "missed deadlines " << missed_deadlines << endl;
cout << "missed deadlines as a % of total requests: " << (float) missed_deadlines / total_num * 100 << endl;
}
return 0;
}
ACE_TMAIN(int argc, ACE_TCHAR **argv)
{
// This will set the global scale factor if the ACE_SCALE_FACTOR
// environment variable is set.
ACE_High_Res_Timer::get_env_global_scale_factor ();
if(argc < 3) {
cerr << "Usage: " << argv[0] << " infile outfile " << endl;
cerr << "The input file contains lines, with the following fields: " << endl;
cerr << "experiment_id total_number_of_requests request_rate url1 p1 url2 p2 url3 p3 TCP_NODELAY SOCKET_RECV_BUFSIZ " << endl;
return 1;
}
FILE *fp = fopen(argv[1],"r");
if(fp == NULL) {
perror("fopen");
return 2;
}
close(1);
int fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0644);
if(fd == -1) {
perror("open");
return 3;
}
int total_num, tcp, sock;
char *id = new char[BUFSIZ];
float rate, p1, p2, p3;
char *url1 = new char[BUFSIZ];
char *url2 = new char[BUFSIZ];
char *url3 = new char[BUFSIZ];
while(!feof(fp)) {
fscanf(fp,"%s %d %f %s %f %s %f %s %f %d %d\n", id, &total_num, &rate, url1, &p1, url2, &p2, url3, &p3, &tcp, &sock);
if (id[0] == '#') continue;
fprintf(stderr,"----\n");
fprintf(stderr,"\tNow performing experiment:%s\n\tSending %d requests at %f requests/second\n", id, total_num, rate);
driver(id, total_num, rate, url1, p1, url2, p2, url3, p3, tcp, sock);
}
fclose(fp);
close(fd);
return 0;
}
|
