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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/* Simple speed tests for jmap. */
#include <ccan/jmap/jmap_type.h>
#include <ccan/jmap/jmap.c>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
struct object {
/* Some contents. Doubles as consistency check. */
struct object *self;
};
/* Nanoseconds per operation */
static size_t normalize(const struct timeval *start,
const struct timeval *stop,
unsigned int num)
{
struct timeval diff;
timersub(stop, start, &diff);
/* Floating point is more accurate here. */
return (double)(diff.tv_sec * 1000000 + diff.tv_usec)
/ num * 1000;
}
JMAP_DEFINE_UINTIDX_TYPE(struct object, obj);
int main(int argc, char *argv[])
{
struct object *objs;
size_t i, j, num;
struct timeval start, stop;
struct jmap_obj *jmap;
num = argv[1] ? atoi(argv[1]) : 1000000;
objs = calloc(num, sizeof(objs[0]));
for (i = 0; i < num; i++) {
objs[i].self = &objs[i];
}
jmap = jmap_obj_new();
printf("Initial insert: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
jmap_obj_add(jmap, i, objs[i].self);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial lookup (match): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, i)->self != objs[i].self)
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial lookup (miss): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, i+num))
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
/* Lookups in order are very cache-friendly for judy; try random */
printf("Initial lookup (random): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num)
if (jmap_obj_get(jmap, j)->self != &objs[j])
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial delete all: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
jmap_obj_del(jmap, i);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Initial re-inserting: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
jmap_obj_add(jmap, i, objs[i].self);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Deleting first half: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i+=2)
jmap_obj_del(jmap, i);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Adding (a different) half: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i+=2)
jmap_obj_add(jmap, num+i, objs[i].self);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after half-change (match): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 1; i < num; i+=2)
if (jmap_obj_get(jmap, i)->self != objs[i].self)
abort();
for (i = 0; i < num; i+=2)
if (jmap_obj_get(jmap, i+num)->self != objs[i].self)
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after half-change(miss): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, i+num*2))
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
/* Hashtables with delete markers can fill with markers over time.
* so do some changes to see how it operates in long-term. */
printf("Details: churning first time\n");
for (i = 1; i < num; i+=2) {
if (!jmap_obj_del(jmap, i))
abort();
jmap_obj_add(jmap, i, objs[i].self);
}
for (i = 0; i < num; i+=2) {
if (!jmap_obj_del(jmap, i+num))
abort();
jmap_obj_add(jmap, i, objs[i].self);
}
for (i = 1; i < 5; i++) {
printf("Churning %s time: ",
i == 1 ? "second"
: i == 2 ? "third"
: i == 3 ? "fourth"
: "fifth");
fflush(stdout);
gettimeofday(&start, NULL);
for (j = 0; j < num; j++) {
if (!jmap_obj_del(jmap, num*(i-1)+j))
abort();
jmap_obj_add(jmap, num*i+j, &objs[j]);
}
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
}
/* Spread out the keys more to try to make it harder. */
printf("Details: reinserting with spread\n");
for (i = 0; i < num; i++) {
if (!jmap_obj_del(jmap, num*4 + i))
abort();
jmap_obj_add(jmap, num * 5 + i * 9, objs[i].self);
}
if (jmap_obj_popcount(jmap, 0, -1) != num)
abort();
printf("Lookup after churn & spread (match): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, num * 5 + i * 9)->self != objs[i].self) {
printf("i =%u\n", i);
abort();
}
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after churn & spread (miss): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i++)
if (jmap_obj_get(jmap, num * 6 + i * 9))
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after churn & spread (random): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0, j = 0; i < num; i++, j = (j + 10007) % num)
if (jmap_obj_get(jmap, num * 5 + j * 9)->self != &objs[j])
abort();
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Lookup after churn & spread (half-random): ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0, j = 0; i < num/2; i++, j = (j + 10007) % num) {
if (jmap_obj_get(jmap, num * 5 + j * 9)->self != &objs[j])
abort();
if (jmap_obj_get(jmap, num * 5 + (j + 1) * 9)->self != &objs[j+1])
abort();
}
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Deleting half after churn & spread: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i+=2)
jmap_obj_del(jmap, num * 5 + i * 9);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
printf("Adding (a different) half after churn & spread: ");
fflush(stdout);
gettimeofday(&start, NULL);
for (i = 0; i < num; i+=2)
jmap_obj_add(jmap, num * 6 + i * 9, objs[i].self);
gettimeofday(&stop, NULL);
printf(" %zu ns\n", normalize(&start, &stop, num));
return 0;
}
|
