source: src/Common/Stats/Heap.cpp@ fbb5bdd

Last change on this file since fbb5bdd was 3c55fcd, checked in by Andrew Beach <ajbeach@…>, 15 months ago

Added some notes about how to enable heap statistics. Reformated some of the related macro code to make it a bit more compact and hopefully clearer.
  • Property mode set to 100644
File size: 8.4 KB
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1//
2// Cforall Version 1.0.0 Copyright (C) 2018 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// Heap.cpp --
8//
9// Author : Thierry Delisle
10// Created On : Thu May 3 16:16:10 2018
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri May 4 17:27:31 2018
13// Update Count : 28
14//
15
16#include <cassert>
17#include <cmath>
18#include <cstddef>
19#include <cstring>
20#include <iomanip>
21#include <iostream>
22
23// Most of the other statistics features are deactivated only by defining
24// NO_STATISTICS (or their NO_%_STATISTICS macro). However the heap has some
25// other compatability concerns and will disable itself in some cases.
26//
27// I do not claim to understand these cases. But TCMALLOC is often defined by
28// default and you can pass --disable-gprofiler to configure to remove it.
29
30#if defined(NO_STATISTICS) || defined(TCMALLOC) || defined(__SANITIZE_ADDRESS__)
31 #define NO_HEAP_STATISTICS
32#elif defined(__has_feature)
33 #if __has_feature(address_sanitizer)
34 #define NO_HEAP_STATISTICS
35 #endif
36#endif
37
38namespace Stats {
39 namespace Heap {
40#if defined( NO_HEAP_STATISTICS )
41 void newPass( const char * const ) {}
42
43 void print() {}
44#else
45 extern bool enabled;
46
47 struct StatBlock {
48 const char * name = nullptr; ///< Name of this pass
49 size_t mallocs = 0; ///< Allocations in this pass
50 size_t frees = 0; ///< Frees in this pass
51 size_t n_allocs = 0; ///< Current number of live allocations
52 size_t peak_allocs = 0; ///< Peak number of live allocations this pass
53 };
54
55 StatBlock passes[100] = {{ "Pre-Parse", 0, 0, 0, 0 }};
56 const size_t passes_size = sizeof(passes) / sizeof(passes[0]);
57 size_t passes_cnt = 1;
58
59 StatBlock stacktrace_stats[100];
60 size_t stacktrace_stats_count = 0;
61 bool stacktrace_stats_enabled = true;
62
63 size_t trace[1000];
64 const size_t stacktrace_max_depth = sizeof(trace) / sizeof(size_t);
65 size_t stacktrace_depth;
66
67 size_t new_stacktrace_id(const char * const name) {
68 stacktrace_stats[stacktrace_stats_count].name = name;
69 return stacktrace_stats_count++;
70 }
71
72 void stacktrace_push(size_t id) {
73 ++stacktrace_depth;
74 assertf(stacktrace_depth < stacktrace_max_depth, "Stack trace too deep: increase size of array in Heap.cpp");
75 trace[stacktrace_depth] = id;
76 }
77
78 void stacktrace_pop() {
79 assertf(stacktrace_depth > 0, "Invalid stack tracing operation: trace is empty");
80 --stacktrace_depth;
81 }
82
83 void newPass( const char * const name ) {
84 passes[passes_cnt].name = name;
85 passes[passes_cnt].mallocs = 0;
86 passes[passes_cnt].frees = 0;
87 passes[passes_cnt].n_allocs
88 = passes[passes_cnt].peak_allocs
89 = passes[passes_cnt-1].n_allocs;
90 passes_cnt++;
91
92 assertf(passes_cnt < passes_size, "Too many passes for Stats::Heap, increase the size of the array in Heap.cpp");
93 }
94
95 void print(size_t value, size_t total) {
96 std::cerr << std::setw(12) << value;
97 std::cerr << "(" << std::setw(3);
98 std::cerr << (value == 0 ? 0 : value * 100 / total);
99 std::cerr << "%) | ";
100 }
101
102 void print(const StatBlock& stat, size_t nc, size_t total_mallocs, size_t total_frees, size_t overall_peak) {
103 std::cerr << std::setw(nc) << stat.name;
104 std::cerr << " | ";
105
106 print(stat.mallocs, total_mallocs);
107 print(stat.frees, total_frees );
108 print(stat.peak_allocs, overall_peak );
109 std::cerr << "\n";
110 }
111
112 void print(char c, size_t nc) {
113 for(size_t i = 0; i < nc; i++) {
114 std::cerr << c;
115 }
116 std::cerr << '\n';
117 }
118
119 void print() {
120 if(!enabled) return;
121
122 size_t nc = 0;
123 size_t total_mallocs = 0;
124 size_t total_frees = 0;
125 size_t overall_peak = 0;
126 for(size_t i = 0; i < passes_cnt; i++) {
127 nc = std::max(nc, std::strlen(passes[i].name));
128 total_mallocs += passes[i].mallocs;
129 total_frees += passes[i].frees;
130 overall_peak = std::max(overall_peak, passes[i].peak_allocs);
131 }
132 size_t nct = nc + 65;
133
134 const char * const title = "Heap Usage Statistic";
135 print('=', nct);
136 for(size_t i = 0; i < (nct - std::strlen(title)) / 2; i++) std::cerr << ' ';
137 std::cerr << title << std::endl;
138 print('-', nct);
139 std::cerr << std::setw(nc) << "Pass";
140 std::cerr << " | Malloc Count | Free Count | Peak Allocs |" << std::endl;
141
142 print('-', nct);
143 for(size_t i = 0; i < passes_cnt; i++) {
144 print(passes[i], nc, total_mallocs, total_frees, overall_peak);
145 }
146
147 print('-', nct);
148 std::cerr << std::setw(nc) << "Trace";
149 std::cerr << " | Malloc Count | Free Count | Peak Allocs |" << std::endl;
150
151 print('-', nct);
152 for (size_t i = 0; i < stacktrace_stats_count; i++) {
153 print(stacktrace_stats[i], nc, total_mallocs, total_frees, overall_peak);
154 }
155 print('-', nct);
156 print({"Sum", total_mallocs, total_frees, 0, overall_peak},
157 nc, total_mallocs, total_frees, overall_peak);
158
159 }
160
161#include <stdarg.h>
162#include <stddef.h>
163#include <stdio.h>
164#include <string.h>
165#include <unistd.h>
166#include <signal.h>
167 extern "C" {
168#include <dlfcn.h>
169#include <execinfo.h>
170 }
171
172 //=============================================================================================
173 // Interposing helpers
174 //=============================================================================================
175
176 typedef void (* generic_fptr_t)(void);
177 generic_fptr_t interpose_symbol( const char * symbol, const char * version ) {
178 const char * error;
179
180 static void * library;
181 if ( ! library ) {
182# if defined( RTLD_NEXT )
183 library = RTLD_NEXT;
184# else
185 // missing RTLD_NEXT => must hard-code library name, assuming libstdc++
186 library = dlopen( "libc.so.6", RTLD_LAZY );
187 error = dlerror();
188 if ( error ) {
189 std::cerr << "interpose_symbol : failed to open libc, " << error << std::endl;
190 abort();
191 }
192# endif // RTLD_NEXT
193 } // if
194
195 generic_fptr_t fptr;
196
197# if defined( _GNU_SOURCE )
198 if ( version ) {
199 fptr = (generic_fptr_t)dlvsym( library, symbol, version );
200 } else {
201 fptr = (generic_fptr_t)dlsym( library, symbol );
202 }
203# else
204 fptr = (generic_fptr_t)dlsym( library, symbol );
205# endif // _GNU_SOURCE
206
207 error = dlerror();
208 if ( error ) {
209 std::cerr << "interpose_symbol : internal error, " << error << std::endl;
210 abort();
211 }
212
213 return fptr;
214 }
215
216 extern "C" {
217 void * malloc( size_t size ) __attribute__((malloc));
218 void * malloc( size_t size ) {
219 static auto __malloc = reinterpret_cast<void * (*)(size_t)>(interpose_symbol( "malloc", nullptr ));
220 if( enabled && passes_cnt > 0 ) {
221 passes[passes_cnt - 1].mallocs++;
222 passes[passes_cnt - 1].n_allocs++;
223 passes[passes_cnt - 1].peak_allocs
224 = std::max(passes[passes_cnt - 1].peak_allocs, passes[passes_cnt - 1].n_allocs);
225 }
226
227 if ( stacktrace_stats_enabled && stacktrace_depth > 0) {
228 stacktrace_stats[trace[stacktrace_depth]].mallocs++;
229 }
230 return __malloc( size );
231 }
232
233 void free( void * ptr ) {
234 static auto __free = reinterpret_cast<void (*)(void *)>(interpose_symbol( "free", nullptr ));
235 if( enabled && passes_cnt > 0 ) {
236 passes[passes_cnt - 1].frees++;
237 passes[passes_cnt - 1].n_allocs--;
238 }
239 if ( stacktrace_stats_enabled && stacktrace_depth > 0) {
240 stacktrace_stats[trace[stacktrace_depth]].frees++;
241 }
242 return __free( ptr );
243 }
244
245 void * calloc( size_t nelem, size_t size ) {
246 static auto __calloc = reinterpret_cast<void * (*)(size_t, size_t)>(interpose_symbol( "calloc", nullptr ));
247 if( enabled && passes_cnt > 0 ) {
248 passes[passes_cnt - 1].mallocs++;
249 passes[passes_cnt - 1].n_allocs++;
250 passes[passes_cnt - 1].peak_allocs
251 = std::max(passes[passes_cnt - 1].peak_allocs, passes[passes_cnt - 1].n_allocs);
252 }
253 if ( stacktrace_stats_enabled && stacktrace_depth > 0) {
254 stacktrace_stats[trace[stacktrace_depth]].mallocs++;
255 }
256 return __calloc( nelem, size );
257 }
258
259 void * realloc( void * ptr, size_t size ) {
260 static auto __realloc = reinterpret_cast<void * (*)(void *, size_t)>(interpose_symbol( "realloc", nullptr ));
261 void * s = __realloc( ptr, size );
262 if ( enabled && s != ptr && passes_cnt > 0 ) { // did realloc get new storage ?
263 passes[passes_cnt - 1].mallocs++;
264 passes[passes_cnt - 1].frees++;
265 } // if
266 if ( stacktrace_stats_enabled && stacktrace_depth > 0) {
267 stacktrace_stats[trace[stacktrace_depth]].mallocs++;
268 stacktrace_stats[trace[stacktrace_depth]].frees++;
269 }
270 return s;
271 }
272 }
273#endif
274 }
275}
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