blob: 57b6798068e7b6133569e7cf8aeb26c7d5384d41 (
plain) (
blame)
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
|
// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/fastos/fastos.h>
#include <vespa/vdslib/state/random.h>
#include <tests/distribution/randombucket.h>
#include <iostream>
namespace RandomBucket{
uint64_t _num_users;
uint64_t _locationbits;
bool _scheme = false;
storage::lib::RandomGen rg;
void setUserDocScheme(uint64_t num_users, uint64_t locationbits)
{
_scheme = true;
_num_users = num_users;
_locationbits = locationbits;
}
void setDocScheme()
{
_scheme = false;
}
uint64_t get()
{
uint64_t u = rg.nextUint64();
if(_scheme){ // userdoc
uint64_t shift = 8 * sizeof(uint64_t) - _locationbits;
uint64_t lsb = u << shift;
lsb >>= shift;
lsb %= _num_users;
u >>= _locationbits;
u <<= _locationbits;
u |= lsb;
}
return u;
}
void setSeed(int seed)
{
if(seed == -1){
rg = storage::lib::RandomGen();
}
else{
rg.setSeed(seed);
}
}
}
|