GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/statistics.cc
Date: 2026-10-25 02:40:14
Exec Total Coverage
Lines: 158 160 98.8%
Branches: 88 131 67.2%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5 #include "statistics.h"
6
7 #include <algorithm>
8 #include <cassert>
9
10 #include "json_document_write.h"
11 #include "util/concurrency.h"
12 #include "util/platform.h"
13 #include "util/smalloc.h"
14 #include "util/string.h"
15
16 using namespace std; // NOLINT
17
18 #ifdef CVMFS_NAMESPACE_GUARD
19 namespace CVMFS_NAMESPACE_GUARD {
20 #endif
21
22 namespace perf {
23
24 28 std::string Counter::ToString() { return StringifyInt(Get()); }
25 29 std::string Counter::Print() { return StringifyInt(Get()); }
26 29 std::string Counter::PrintK() { return StringifyInt(Get() / 1000); }
27 29 std::string Counter::PrintKi() { return StringifyInt(Get() / 1024); }
28 29 std::string Counter::PrintM() { return StringifyInt(Get() / (1000 * 1000)); }
29 29 std::string Counter::PrintMi() { return StringifyInt(Get() / (1024 * 1024)); }
30 58 std::string Counter::PrintRatio(Counter divider) {
31 58 const double enumerator_value = Get();
32 58 const double divider_value = divider.Get();
33 58 return StringifyDouble(enumerator_value / divider_value);
34 }
35
36
37 //-----------------------------------------------------------------------------
38
39
40 /**
41 * Creates a new Statistics binder which maintains the same Counters as the
42 * existing one. Changes to those counters are visible in both Statistics
43 * objects. The child can then independently add more counters. CounterInfo
44 * objects are reference counted and deleted when all the statistics objects
45 * dealing with it are destroyed.
46 */
47 1668 Statistics *Statistics::Fork() {
48
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 1668 Statistics *child = new Statistics();
49
50 1668 const MutexLockGuard lock_guard(lock_);
51 3336 for (map<string, CounterInfo *>::iterator i = counters_.begin(),
52 1668 iEnd = counters_.end();
53
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 67296 i != iEnd;
54 65628 ++i) {
55 65628 i->second->refcnt.fetch_add(1);
56 }
57
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 1668 child->counters_ = counters_;
58
59 1668 return child;
60 1668 }
61
62
63 1569 Counter *Statistics::Lookup(const std::string &name) const {
64 1569 const MutexLockGuard lock_guard(lock_);
65
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 1569 const map<string, CounterInfo *>::const_iterator i = counters_.find(name);
66
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 1569 if (i != counters_.end())
67 621 return &i->second->counter;
68 948 return NULL;
69 1569 }
70
71
72 28 string Statistics::LookupDesc(const std::string &name) {
73 28 const MutexLockGuard lock_guard(lock_);
74
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 28 const map<string, CounterInfo *>::const_iterator i = counters_.find(name);
75
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 28 if (i != counters_.end())
76
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 28 return i->second->desc;
77 ✗ return "";
78 28 }
79
80 28 string Statistics::PrintList(const PrintOptions print_options) {
81 28 string result;
82
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 28 if (print_options == kPrintHeader)
83 ✗ result += "Name|Value|Description\n";
84
85 28 const MutexLockGuard lock_guard(lock_);
86 28 for (map<string, CounterInfo *>::const_iterator i = counters_.begin(),
87 28 iEnd = counters_.end();
88
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 56 i != iEnd;
89 28 ++i) {
90
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 56 result += i->first + "|" + i->second->counter.ToString() + "|"
91
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 56 + i->second->desc + "\n";
92 }
93 56 return result;
94 28 }
95
96 /**
97 * Converts statistics counters into JSON string in following format
98 * {
99 * "name_major1": {
100 * "counter1": val1,
101 * "counter2": val2
102 * },
103 * "name_major2": {
104 * "counter3": val3
105 * }
106 * }
107 */
108 62 string Statistics::PrintJSON() {
109 62 const MutexLockGuard lock_guard(lock_);
110
111 62 JsonStringGenerator json_statistics;
112
113 // Make use of std::map key ordering and add counters namespace by namespace
114 62 JsonStringGenerator json_statistics_namespace;
115
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 62 std::string last_namespace = "";
116 62 for (map<string, CounterInfo *>::const_iterator i = counters_.begin(),
117 62 iEnd = counters_.end();
118
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 149 i != iEnd;
119 87 ++i) {
120
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 87 std::vector<std::string> tokens = SplitString(i->first, '.');
121
122
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 87 if (tokens[0] != last_namespace) {
123
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 58 if (last_namespace != "") {
124
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 29 json_statistics.AddJsonObject(
125
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 58 last_namespace, json_statistics_namespace.GenerateString());
126 }
127 58 json_statistics_namespace.Clear();
128 }
129
130
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 87 json_statistics_namespace.Add(tokens[1], i->second->counter.Get());
131
132
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 87 last_namespace = tokens[0];
133 87 }
134
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 62 if (last_namespace != "") {
135
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 29 json_statistics.AddJsonObject(last_namespace,
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 58 json_statistics_namespace.GenerateString());
137 }
138
139
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 124 return json_statistics.GenerateString();
140 62 }
141
142 /**
143 * Snapshot current state of the counters.
144 * Elements will either be updated or inserted into the map.
145 *
146 * Note: This function does NOT clear previous elements part of the map.
147 *
148 * Returns map of the updated counters and the timestamp of the snapshot.
149 */
150 72 void Statistics::SnapshotCounters(std::map<std::string, int64_t> *counters,
151 uint64_t *timestamp_ns) {
152 72 const MutexLockGuard lock_guard(lock_);
153 72 *timestamp_ns = platform_realtime_ns();
154 72 for (map<string, CounterInfo *>::const_iterator i = counters_.begin(),
155 72 iEnd = counters_.end();
156
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 288 i != iEnd;
157 216 ++i) {
158 // modify or insert
159
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 216 (*counters)[i->first] = (*i->second).counter.Get();
160 }
161 72 }
162
163 301469 Counter *Statistics::Register(const string &name, const string &desc) {
164 301469 const MutexLockGuard lock_guard(lock_);
165
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 301469 assert(counters_.find(name) == counters_.end());
166
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 301469 CounterInfo *counter_info = new CounterInfo(desc);
167
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 301469 counters_[name] = counter_info;
168 301469 return &counter_info->counter;
169 301469 }
170
171
172 9512 Statistics::Statistics() {
173 9512 lock_ = reinterpret_cast<pthread_mutex_t *>(smalloc(sizeof(pthread_mutex_t)));
174 9512 const int retval = pthread_mutex_init(lock_, NULL);
175
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 9512 assert(retval == 0);
176 9512 }
177
178
179 9502 Statistics::~Statistics() {
180 19004 for (map<string, CounterInfo *>::iterator i = counters_.begin(),
181 9502 iEnd = counters_.end();
182
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 376398 i != iEnd;
183 366896 ++i) {
184 366896 const int32_t old_value = i->second->refcnt.fetch_add(-1);
185
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 366896 if (old_value == 1)
186
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 301268 delete i->second;
187 }
188 9502 pthread_mutex_destroy(lock_);
189 9502 free(lock_);
190 9502 }
191
192
193 //------------------------------------------------------------------------------
194
195
196 /**
197 * If necessary, capacity_s is extended to be a multiple of resolution_s
198 */
199 9002 Recorder::Recorder(uint32_t resolution_s, uint32_t capacity_s)
200 9002 : last_timestamp_(0), capacity_s_(capacity_s), resolution_s_(resolution_s) {
201
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 9002 assert((resolution_s > 0) && (capacity_s > resolution_s));
202 9002 const bool has_remainder = (capacity_s_ % resolution_s_) != 0;
203
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 9002 if (has_remainder) {
204 56 capacity_s_ += resolution_s_ - (capacity_s_ % resolution_s_);
205 }
206 9002 no_bins_ = capacity_s_ / resolution_s_;
207
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 9002 bins_.reserve(no_bins_);
208
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 728380 for (unsigned i = 0; i < no_bins_; ++i)
209
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 719378 bins_.push_back(0);
210 9002 }
211
212
213 56 void Recorder::Tick() { TickAt(platform_monotonic_time()); }
214
215
216 3046 void Recorder::TickAt(uint64_t timestamp) {
217 3046 const uint64_t bin_abs = timestamp / resolution_s_;
218 3046 const uint64_t last_bin_abs = last_timestamp_ / resolution_s_;
219
220 // timestamp in the past: don't update last_timestamp_
221
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 3046 if (bin_abs < last_bin_abs) {
222 // Do we still remember this event?
223
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 56 if ((last_bin_abs - bin_abs) < no_bins_)
224 28 bins_[bin_abs % no_bins_]++;
225 56 return;
226 }
227
228
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 2990 if (last_bin_abs == bin_abs) {
229 670 bins_[bin_abs % no_bins_]++;
230 } else {
231 // When clearing bins between last_timestamp_ and now, avoid cycling the
232 // ring buffer multiple times.
233 4640 const unsigned max_bins_clear = std::min(bin_abs,
234 2320 last_bin_abs + no_bins_ + 1);
235
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 21421 for (uint64_t i = last_bin_abs + 1; i < max_bins_clear; ++i)
236 19101 bins_[i % no_bins_] = 0;
237 2320 bins_[bin_abs % no_bins_] = 1;
238 }
239
240 2990 last_timestamp_ = timestamp;
241 }
242
243
244 515 uint64_t Recorder::GetNoTicks(uint32_t retrospect_s) const {
245 515 const uint64_t now = platform_monotonic_time();
246
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 515 if (retrospect_s > now)
247 282 retrospect_s = now;
248
249 515 const uint64_t last_bin_abs = last_timestamp_ / resolution_s_;
250 515 const uint64_t past_bin_abs = (now - retrospect_s) / resolution_s_;
251 1030 const int64_t min_bin_abs = std::max(
252 past_bin_abs,
253
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 515 (last_bin_abs < no_bins_) ? 0 : (last_bin_abs - (no_bins_ - 1)));
254 515 uint64_t result = 0;
255
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 3606 for (int64_t i = last_bin_abs; i >= min_bin_abs; --i) {
256 3091 result += bins_[i % no_bins_];
257 }
258
259 515 return result;
260 }
261
262
263 //------------------------------------------------------------------------------
264
265
266 8750 void MultiRecorder::AddRecorder(uint32_t resolution_s, uint32_t capacity_s) {
267
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 8750 recorders_.push_back(Recorder(resolution_s, capacity_s));
268 8750 }
269
270
271 152 uint64_t MultiRecorder::GetNoTicks(uint32_t retrospect_s) const {
272 152 const unsigned N = recorders_.size();
273
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 210 for (unsigned i = 0; i < N; ++i) {
274
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 181 if ((recorders_[i].capacity_s() >= retrospect_s) || (i == (N - 1))) {
275 123 return recorders_[i].GetNoTicks(retrospect_s);
276 }
277 }
278 29 return 0;
279 }
280
281
282 130 void MultiRecorder::Tick() {
283 130 const uint64_t now = platform_monotonic_time();
284
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 476 for (unsigned i = 0; i < recorders_.size(); ++i)
285 346 recorders_[i].TickAt(now);
286 130 }
287
288
289 580 void MultiRecorder::TickAt(uint64_t timestamp) {
290
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 1740 for (unsigned i = 0; i < recorders_.size(); ++i)
291 1160 recorders_[i].TickAt(timestamp);
292 580 }
293
294 } // namespace perf
295
296
297 #ifdef CVMFS_NAMESPACE_GUARD
298 } // namespace CVMFS_NAMESPACE_GUARD
299 #endif
300