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1 | // -*- C++ -*- |
2 | // Boost general library 'format' --------------------------- | |
3 | // See http://www.boost.org for updates, documentation, and revision history. | |
4 | ||
5 | // Copyright (c) 2001 Samuel Krempp | |
6 | // krempp@crans.ens-cachan.fr | |
7 | // Distributed under the Boost Software License, Version 1.0. (See | |
8 | // accompanying file LICENSE_1_0.txt or copy at | |
9 | // http://www.boost.org/LICENSE_1_0.txt) | |
10 | ||
11 | // several suggestions from Jens Maurer | |
12 | ||
13 | // ------------------------------------------------------------------------------ | |
b32b8144 | 14 | // bench_variants.cc : do the same task, with sprintf, stream, and format |
7c673cae FG |
15 | // and compare their times. |
16 | ||
17 | // This benchmark is provided purely for information. | |
18 | // It might not even compile as-is, | |
19 | // or not give any sensible results. | |
20 | // (e.g., it expects sprintf to be POSIX compliant) | |
21 | ||
22 | // ------------------------------------------------------------------------------ | |
23 | ||
24 | ||
25 | #include <iostream> | |
26 | #include <iomanip> | |
27 | #include <cstdio> // sprintf | |
28 | #include <cstring> | |
29 | #include <fstream> | |
30 | #include <cmath> // floor | |
31 | #include <boost/timer.hpp> | |
b32b8144 | 32 | #include <vector> |
7c673cae FG |
33 | |
34 | #include <boost/format.hpp> | |
35 | ||
7c673cae FG |
36 | // portable /dev/null stream equivalent, by James Kanze, http://www.gabi-soft.de |
37 | class NulStreambuf : public std::streambuf | |
38 | { | |
39 | public: | |
40 | NulStreambuf() { | |
41 | setp( dummyBuffer , dummyBuffer + 64 ) ; | |
42 | } | |
43 | virtual int overflow( int c ); | |
44 | virtual int underflow(); | |
45 | private: | |
46 | char dummyBuffer[ 64 ] ; | |
47 | } ; | |
48 | ||
49 | class NulStream : public std::basic_ostream<char, std::char_traits<char> > | |
50 | { | |
51 | public: | |
52 | NulStream(); | |
53 | virtual ~NulStream(); | |
54 | NulStreambuf* rdbuf() { | |
55 | return static_cast< NulStreambuf* >( | |
56 | ((std::basic_ostream<char, std::char_traits<char> > *) this) -> rdbuf() ) ; | |
57 | } | |
58 | } ; | |
59 | ||
60 | ||
61 | //------------------------------------------------------------------------------------- | |
62 | // NulStream implementation | |
63 | ||
64 | NulStream::NulStream() : std::basic_ostream<char, std::char_traits<char> > (NULL) { | |
65 | init( new NulStreambuf ) ; | |
66 | } | |
67 | ||
68 | NulStream::~NulStream() { | |
69 | delete rdbuf() ; | |
70 | } | |
71 | ||
72 | int NulStreambuf::underflow(){ return std::ios::traits_type::eof(); | |
73 | } | |
74 | ||
75 | int NulStreambuf::overflow( int c ){ | |
76 | setp( dummyBuffer , dummyBuffer + 64 ) ; | |
77 | return (c == std::ios::traits_type::eof()) ? '\0' : c ; | |
78 | } | |
79 | ||
80 | ||
81 | ||
82 | // ------------------------------------------------------------------------------------- | |
83 | ||
b32b8144 FG |
84 | namespace benchmark { |
85 | ||
7c673cae FG |
86 | static int NTests = 300000; |
87 | ||
88 | //static std::stringstream nullStream; | |
89 | static NulStream nullStream; | |
90 | static double tstream, tpf; | |
91 | //static const std::string fstring="%3$#x %1$20.10E %2$g %3$d \n"; | |
92 | static const std::string fstring="%3$0#6x %1$20.10E %2$g %3$0+5d \n"; | |
93 | static const double arg1=45.23; | |
94 | static const double arg2=12.34; | |
95 | static const int arg3=23; | |
96 | static const std::string res = | |
97 | "0x0017 4.5230000000E+01 12.34 +0023 \n"; | |
98 | //static const std::string res = "23.0000 4.5230000000E+01 12.34 23 \n"; | |
b32b8144 FG |
99 | |
100 | void test_sprintf(); | |
7c673cae FG |
101 | void test_nullstream(); |
102 | void test_opti_nullstream(); | |
103 | void test_parsed_once_format(); | |
104 | void test_reused_format(); | |
105 | void test_format(); | |
106 | void test_try1(); | |
107 | void test_try2(); | |
108 | ||
b32b8144 | 109 | void test_sprintf() |
7c673cae FG |
110 | { |
111 | using namespace std; | |
112 | ||
b32b8144 FG |
113 | vector<char> bufr; |
114 | bufr.reserve(4000); | |
115 | char *buf = &bufr[0]; | |
116 | ||
117 | // Check that sprintf is Unix98 compatible on the platform : | |
7c673cae FG |
118 | sprintf(buf, fstring.c_str(), arg1, arg2, arg3); |
119 | if( strncmp( buf, res.c_str(), res.size()) != 0 ) { | |
120 | cerr << endl << buf; | |
121 | } | |
122 | // time the loop : | |
123 | boost::timer chrono; | |
124 | for(int i=0; i<NTests; ++i) { | |
125 | sprintf(buf, fstring.c_str(), arg1, arg2, arg3); | |
126 | } | |
127 | tpf=chrono.elapsed(); | |
128 | cout << left << setw(20) <<"printf time"<< right <<":" << tpf << endl; | |
129 | } | |
130 | ||
131 | void test_try1() | |
132 | { | |
133 | using namespace std; | |
134 | boost::io::basic_oaltstringstream<char> oss; | |
135 | oss << boost::format(fstring) % arg1 % arg2 % arg3; | |
136 | boost::timer chrono; | |
11fdf7f2 | 137 | size_t dummy=0; |
7c673cae FG |
138 | for(int i=0; i<NTests; ++i) { |
139 | dummy += oss.cur_size(); | |
140 | } | |
141 | double t = chrono.elapsed(); | |
142 | cout << left << setw(20) <<"try1 time"<< right <<":" << setw(5) << t | |
143 | << ", = " << t / tpf << " * printf " | |
144 | << ", = " << t / tstream << " * nullStream \n"; | |
145 | } | |
146 | ||
147 | void test_try2() | |
148 | { | |
149 | using namespace std; | |
150 | boost::io::basic_oaltstringstream<char> oss; | |
151 | oss << boost::format(fstring) % arg1 % arg2 % arg3; | |
152 | oss << "blas 34567890GGGGGGGGGGGGGGGGGGGGGGGGGGGGggggggggggggggggggggggggggg " << endl; | |
153 | string s = oss.cur_str(); | |
154 | oss << s << s << s; | |
155 | oss.clear_buffer(); | |
156 | oss << s << s; | |
157 | s = oss.cur_str(); | |
158 | boost::timer chrono; | |
11fdf7f2 | 159 | size_t dummy=0; |
7c673cae FG |
160 | for(int i=0; i<NTests; ++i) { |
161 | dummy += oss.cur_size(); | |
162 | } | |
163 | double t = chrono.elapsed(); | |
164 | cout << left << setw(20) <<"try2 time"<< right <<":" << setw(5) << t | |
165 | << ", = " << t / tpf << " * printf " | |
166 | << ", = " << t / tstream << " * nullStream \n"; | |
167 | } | |
168 | ||
169 | void do_stream(std::ostream& os) { | |
170 | using namespace std; | |
171 | std::ios_base::fmtflags f = os.flags(); | |
172 | os << hex << showbase << internal << setfill('0') << setw(6) << arg3 | |
173 | << dec << noshowbase << right << setfill(' ') | |
174 | << " " | |
175 | << scientific << setw(20) << setprecision(10) << uppercase << arg1 | |
176 | << setprecision(6) << nouppercase ; | |
177 | os.flags(f); | |
178 | os << " " << arg2 << " " | |
179 | << showpos << setw(5) << internal << setfill('0') << arg3 << " \n" ; | |
180 | os.flags(f); | |
181 | } | |
182 | ||
183 | void test_nullstream() | |
184 | { | |
185 | using namespace std; | |
186 | boost::timer chrono; | |
187 | boost::io::basic_oaltstringstream<char> oss; | |
188 | ||
189 | { | |
190 | do_stream(oss); | |
191 | if(oss.str() != res ) { | |
192 | cerr << endl << oss.str() ; | |
193 | } | |
194 | } | |
195 | ||
196 | for(int i=0; i<NTests; ++i) { | |
197 | do_stream(nullStream); | |
198 | } | |
199 | ||
200 | // for(int i=0; i<NTests; ++i) { | |
201 | // std::ios_base::fmtflags f0 = nullStream.flags(); | |
202 | // nullStream << hex << showbase << arg3 | |
203 | // << dec << noshowbase << " " | |
204 | // << scientific << setw(20) << setprecision(10) << uppercase << arg1 | |
205 | // << setprecision(0); | |
206 | // nullStream.flags(f0); | |
207 | // nullStream << " " << arg2 << " " << arg3 << " \n" ; | |
208 | ||
209 | // } | |
210 | double t = chrono.elapsed(); | |
211 | cout << left << setw(20) <<"ostream time"<< right <<":" << setw(5) << t | |
212 | << ", = " << t / tpf << " * printf \n"; | |
213 | tstream = t; | |
214 | } | |
215 | ||
216 | void test_opti_nullstream() | |
217 | { | |
218 | using namespace std; | |
219 | boost::timer chrono; | |
220 | boost::io::basic_oaltstringstream<char> oss; | |
221 | //static const std::string fstring="%3$#x %1$20.10E %2$g %3$d \n"; | |
222 | ||
223 | std::ios_base::fmtflags f0 = oss.flags(), f1, f2; | |
224 | streamsize p0 = oss.precision(); | |
225 | { | |
226 | oss << hex << showbase; | |
227 | f1 = oss.flags(); | |
228 | oss << arg3; | |
229 | ||
230 | oss.flags(f0); | |
231 | oss << " " << scientific << setw(20) << setprecision(10) << uppercase; | |
232 | f2 = oss.flags(); | |
233 | oss << arg1; | |
234 | ||
235 | oss.flags(f0); oss.precision(p0); | |
236 | oss << " " << arg2 << " " << arg3 << " \n" ; | |
237 | ||
238 | if(oss.str() != res ) { | |
239 | cerr << endl << oss.str() ; | |
240 | } | |
241 | } | |
242 | ||
243 | for(int i=0; i<NTests; ++i) { | |
244 | nullStream.flags(f1); | |
245 | nullStream << arg3; | |
246 | ||
247 | nullStream << setw(20) << setprecision(10); | |
248 | nullStream.flags(f2); | |
249 | nullStream << arg1; | |
250 | ||
251 | nullStream.flags(f0); nullStream.precision(p0); | |
252 | nullStream << " " << arg2 << " " << arg3 << " \n" ; | |
253 | } | |
254 | double t = chrono.elapsed(); | |
255 | cout << left << setw(20) <<"opti-stream time"<< right <<":" << setw(5) << t | |
256 | << ", = " << t / tpf << " * printf \n"; | |
257 | // tstream = t; | |
258 | } | |
259 | ||
260 | void test_parsed_once_format() | |
261 | { | |
262 | using namespace std; | |
263 | static const boost::format fmter(fstring); | |
264 | ||
265 | boost::io::basic_oaltstringstream<char> oss; | |
266 | oss << boost::format(fmter) % arg1 % arg2 % arg3 ; | |
267 | if( oss.str() != res ) { | |
268 | cerr << endl << oss.str(); | |
269 | } | |
270 | ||
271 | // not only is the format-string parsed once, | |
272 | // but also the buffer of the internal stringstream is already allocated. | |
273 | ||
274 | boost::timer chrono; | |
275 | for(int i=0; i<NTests; ++i) { | |
276 | nullStream << boost::format(fmter) % arg1 % arg2 % arg3; | |
277 | } | |
278 | double t=chrono.elapsed(); | |
279 | cout << left << setw(20) <<"parsed-once time"<< right <<":" << setw(5) << t | |
280 | << ", = " << t / tpf << " * printf " | |
281 | << ", = " << t / tstream << " * nullStream \n"; | |
282 | } | |
283 | ||
284 | void test_reused_format() | |
285 | { | |
286 | using namespace std; | |
287 | boost::io::basic_oaltstringstream<char> oss; | |
288 | oss << boost::format(fstring) % arg1 % arg2 % arg3; | |
289 | if(oss.str() != res ) { | |
290 | cerr << endl << oss.str(); | |
291 | } | |
292 | ||
293 | boost::timer chrono; | |
294 | boost::format fmter; | |
295 | for(int i=0; i<NTests; ++i) { | |
296 | nullStream << fmter.parse(fstring) % arg1 % arg2 % arg3; | |
297 | } | |
298 | double t = chrono.elapsed(); | |
299 | cout << left << setw(20) <<"reused format time"<< right <<":" << setw(5) << t | |
300 | << ", = " << t / tpf << " * printf " | |
301 | << ", = " << t / tstream << " * nullStream \n"; | |
302 | } | |
303 | ||
304 | void test_format() | |
305 | { | |
306 | using namespace std; | |
307 | boost::io::basic_oaltstringstream<char> oss; | |
308 | oss << boost::format(fstring) % arg1 % arg2 % arg3; | |
309 | if(oss.str() != res ) { | |
310 | cerr << endl << oss.str(); | |
311 | } | |
312 | ||
313 | boost::timer chrono; | |
314 | for(int i=0; i<NTests; ++i) { | |
315 | nullStream << boost::format(fstring) % arg1 % arg2 % arg3; | |
316 | } | |
317 | double t = chrono.elapsed(); | |
318 | cout << left << setw(20) <<"format time"<< right <<":" << setw(5) << t | |
319 | << ", = " << t / tpf << " * printf " | |
320 | << ", = " << t / tstream << " * nullStream \n"; | |
321 | } | |
322 | ||
b32b8144 | 323 | } // benchmark |
7c673cae | 324 | |
b32b8144 FG |
325 | int main(int argc, char * argv[]) { |
326 | using namespace benchmark; | |
327 | using namespace boost; | |
328 | using namespace std; | |
329 | const string::size_type npos = string::npos; | |
330 | ||
331 | string choices = ""; | |
332 | if (1<argc) { | |
333 | choices = (argv[1]); // profiling is easier launching only one. | |
334 | NTests = 1000 * 1000; // andmoreprecise with many iterations | |
335 | cout << "choices (" << choices << ") \n"; | |
336 | } | |
337 | ||
338 | if (choices == "" || choices.find('p') != npos) | |
339 | test_sprintf(); | |
340 | if (choices == "" || choices.find('n') != npos) | |
341 | test_nullstream(); | |
342 | if (choices == "" || choices.find('1') != npos) | |
343 | test_parsed_once_format(); | |
344 | if (choices == "" || choices.find('r') != npos) | |
345 | test_reused_format(); | |
346 | if (choices == "" || choices.find('f') != npos) | |
347 | test_format(); | |
348 | if (choices.find('t') != npos) | |
349 | test_try1(); | |
350 | if (choices.find('y') != npos) | |
351 | test_try2(); | |
352 | if (choices.find('o') != npos) | |
353 | test_opti_nullstream(); | |
354 | return 0; | |
7c673cae | 355 | } |
b32b8144 | 356 |