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
|
#include "stdinc.h"
enum {
Nblock = 300000,
BlockSize = 8*1024
};
uchar data[Nblock*VtScoreSize];
int rflag;
int nblock = 10000;
int perm[Nblock];
void
main(int argc, char *argv[])
{
VtSession *z;
int i, j, t;
int start;
uchar buf[BlockSize];
srand(time(0));
ARGBEGIN{
case 'r':
rflag++;
break;
case 'n':
nblock = atoi(ARGF());
break;
}ARGEND
for(i=0; i<nblock; i++)
perm[i] = i;
if(rflag) {
for(i=0; i<nblock; i++) {
j = nrand(nblock);
t = perm[j];
perm[j] = perm[i];
perm[i] = t;
}
}
if(readn(0, data, VtScoreSize*nblock) < VtScoreSize*nblock)
sysfatal("read failed: %r");
vtAttach();
z = vtDial("iolaire2");
if(z == nil)
sysfatal("cound not connect to venti");
if(!vtConnect(z, 0))
vtFatal("vtConnect: %s", vtGetError());
print("starting\n");
start = times(0);
if(rflag && nblock > 10000)
nblock = 10000;
for(i=0; i<nblock; i++) {
if(vtRead(z, data+perm[i]*VtScoreSize, VtDataType, buf, BlockSize) < 0)
vtFatal("vtRead failed: %d: %s", i, vtGetError());
}
print("time = %f\n", (times(0) - start)*0.001);
vtClose(z);
vtDetach();
}
|