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1 | /* | |
2 | * stats.c -- Statistics helpers | |
3 | * | |
4 | * Copyright (C) 2004 Henrique de Moraes Holschuh <hmh@debian.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #define _GNU_SOURCE | |
22 | ||
23 | #ifndef HAVE_CONFIG_H | |
24 | #error Invalid or missing autoconf build environment | |
25 | #endif | |
26 | ||
27 | #include "rng-tools-config.h" | |
28 | ||
29 | #include <unistd.h> | |
30 | #include <stdint.h> | |
31 | #include <stdio.h> | |
32 | #include <sys/time.h> | |
33 | #include <time.h> | |
34 | #include <string.h> | |
35 | ||
36 | #include "fips.h" | |
37 | #include "stats.h" | |
38 | ||
39 | ||
40 | static char stat_prefix[20] = ""; | |
41 | ||
42 | void set_stat_prefix(const char* prefix) | |
43 | { | |
44 | stat_prefix[sizeof(stat_prefix)-1] = 0; | |
45 | strncpy(stat_prefix, prefix, sizeof(stat_prefix)-1); | |
46 | } | |
47 | ||
48 | static void scale_mult_unit(char *unit, int unitsize, | |
49 | const char *baseunit, | |
50 | double *value_min, | |
51 | double *value_avg, | |
52 | double *value_max) | |
53 | { | |
54 | int mult = 0; | |
55 | char multchar[] = "KMGTPE"; | |
56 | ||
57 | while ((*value_min >= 1024.0) && (*value_avg >= 1024.0) && | |
58 | (*value_max >= 1024.0) && (mult < sizeof(multchar))) { | |
59 | mult++; | |
60 | *value_min = *value_min / 1024.0; | |
61 | *value_max = *value_max / 1024.0; | |
62 | *value_avg = *value_avg / 1024.0; | |
63 | } | |
64 | unit[unitsize-1] = 0; | |
65 | if (mult) | |
66 | snprintf(unit, unitsize, "%ci%s", multchar[mult-1], baseunit); | |
67 | else | |
68 | strncpy(unit, baseunit, unitsize); | |
69 | } | |
70 | ||
71 | /* Computes elapsed time in microseconds */ | |
72 | uint64_t elapsed_time(struct timeval *start, | |
73 | struct timeval *stop) | |
74 | { | |
75 | uint64_t diff; | |
76 | ||
77 | if (stop->tv_sec < start->tv_sec) return 0; | |
78 | ||
79 | diff = (stop->tv_sec - start->tv_sec) * 1000000ULL; | |
80 | if (stop->tv_usec > start->tv_usec) { | |
81 | diff += stop->tv_usec - start->tv_usec; | |
82 | } else { | |
83 | diff -= start->tv_usec - stop->tv_usec; | |
84 | } | |
85 | ||
86 | return diff; | |
87 | } | |
88 | ||
89 | /* Updates min-max stat */ | |
90 | void update_stat(struct rng_stat *stat, uint64_t value) | |
91 | { | |
92 | uint64_t overflow = stat->num_samples; | |
93 | ||
94 | if ((stat->min == 0 ) || (value < stat->min)) stat->min = value; | |
95 | if (value > stat->max) stat->max = value; | |
96 | if (++stat->num_samples > overflow) { | |
97 | stat->sum += value; | |
98 | } else { | |
99 | stat->sum = value; | |
100 | stat->num_samples = 1; | |
101 | } | |
102 | } | |
103 | ||
104 | char *dump_stat_counter(char *buf, int size, | |
105 | const char *msg, uint64_t value) | |
106 | { | |
107 | buf[size-1] = 0; | |
108 | snprintf(buf, size-1, "%s%s: %llu", stat_prefix, msg, | |
109 | (unsigned long long) value); | |
110 | ||
111 | return buf; | |
112 | } | |
113 | ||
114 | char *dump_stat_stat(char *buf, int size, | |
115 | const char *msg, const char *unit, struct rng_stat *stat) | |
116 | { | |
117 | double avg = 0.0; | |
118 | ||
119 | if (stat->num_samples > 0) | |
120 | avg = (double)stat->sum / stat->num_samples; | |
121 | ||
122 | buf[size-1] = 0; | |
123 | snprintf(buf, size-1, "%s%s: (min=%llu; avg=%.3f; max=%llu)%s", | |
124 | stat_prefix, msg, (unsigned long long) stat->min, avg, | |
125 | (unsigned long long) stat->max, unit); | |
126 | ||
127 | return buf; | |
128 | } | |
129 | ||
130 | char *dump_stat_bw(char *buf, int size, | |
131 | const char *msg, const char *unit, | |
132 | struct rng_stat *stat, | |
133 | uint64_t blocksize) | |
134 | { | |
135 | char unitscaled[20]; | |
136 | double bw_avg = 0.0, bw_min = 0.0, bw_max = 0.0; | |
137 | ||
138 | if (stat->max > 0) | |
139 | bw_min = (1000000.0 * blocksize) / stat->max; | |
140 | if (stat->min > 0) | |
141 | bw_max = (1000000.0 * blocksize) / stat->min; | |
142 | if (stat->num_samples > 0) | |
143 | bw_avg = (1000000.0 * blocksize * stat->num_samples) / stat->sum; | |
144 | ||
145 | scale_mult_unit(unitscaled, sizeof(unitscaled), unit, | |
146 | &bw_min, &bw_avg, &bw_max); | |
147 | ||
148 | buf[size-1] = 0; | |
149 | snprintf(buf, size-1, "%s%s: (min=%.3f; avg=%.3f; max=%.3f)%s/s", | |
150 | stat_prefix, msg, bw_min, bw_avg, bw_max, unitscaled); | |
151 | ||
152 | return buf; | |
153 | } | |
154 |