{"id":14156,"date":"2023-07-18T12:15:19","date_gmt":"2023-07-18T12:15:19","guid":{"rendered":"https:\/\/blog.bachi.net\/?p=14156"},"modified":"2023-07-20T15:22:41","modified_gmt":"2023-07-20T15:22:41","slug":"c-chrono","status":"publish","type":"post","link":"https:\/\/blog.bachi.net\/?p=14156","title":{"rendered":"C++ chrono"},"content":{"rendered":"

C++ Performance Timer<\/a>, uses the C++20 language standard<\/p>\n

cppreference.com<\/h3>\n

Date and time utilities<\/a>
\nstd::chrono::duration<\/a>
\nstd::formatter<\/a>
\nstd::put_time<\/a><\/p>\n

cplusplus.com<\/h3>\n

Time library<\/a>
\nstd::chrono::duration<\/a><\/p>\n

C++ Cross-Platform High-Resolution Timer<\/a>
\nchrono_literals is not a namespace-name<\/a>
\nHow to get duration, as int milli’s and float seconds from ?<\/a>
\nOutputting Date and Time in C++ using std::chrono<\/a>
\nPrint current system time in nanoseconds using c++ chrono<\/a>
\nHow to convert std::chrono::time_point to string<\/a><\/p>\n

<\/p>\n\n

Old-Style C<\/h1>\n

Print current system time in nanoseconds using c++ chrono<\/a>
\nwhat is gettimeofday() equivalent in c++11<\/a><\/p>\n

\r\nstruct timeval now;\r\n\r\n\/\/ seconds and nanoseconds\r\ngettimeofday(&now, NULL);\r\nconst std::tm *localTime = std::localtime((time_t *) &now.tv_sec);\r\n\r\n\/\/ only in seconds\r\n\/\/std::time_t now = std::time(nullptr);\r\n\/\/const std::tm *localTime = std::localtime(&now);\r\n\r\n\/\/ GCC < 5.0\r\nchar dateTime[] = "00.00.00 00:00:00.";\r\nchar millis [] = "000";\r\nstrftime(dateTime, sizeof(dateTime), "%d.%m.%y %H:%M:%S.", localTime);\r\nsnprintf(millis, sizeof(millis), "%03li", now.tv_usec\/1000 );\r\n\r\ncout << dateTime << millis << " | ";\r\n<\/pre>\n
<\/p>\n\n
date<\/h1>\n
<\/a><\/p>\n
<\/p>\n\n
SIGSEGV<\/h1>\n
\r\n$ gdb build\/bin\/PerfTest\r\nGNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-120.el7\r\nCopyright (C) 2013 Free Software Foundation, Inc.\r\nLicense GPLv3+: GNU GPL version 3 or later <http:\/\/gnu.org\/licenses\/gpl.html>\r\nThis is free software: you are free to change and redistribute it.\r\nThere is NO WARRANTY, to the extent permitted by law.  Type "show copying"\r\nand "show warranty" for details.\r\nThis GDB was configured as "x86_64-redhat-linux-gnu".\r\nFor bug reporting instructions, please see:\r\n<http:\/\/www.gnu.org\/software\/gdb\/bugs\/>...\r\nReading symbols from \/app\/dev\/andreas\/build\/bin\/PerfTest...done.\r\n(gdb) r\r\nStarting program: \/app\/dev\/andreas\/build\/bin\/PerfTest\r\n[Thread debugging using libthread_db enabled]\r\nUsing host libthread_db library "\/lib64\/libthread_db.so.1".\r\n\r\nProgram received signal SIGSEGV, Segmentation fault.\r\n0x00007ffff6b316a3 in std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () from \/lib64\/libstdc++.so.6\r\nMissing separate debuginfos, use: debuginfo-install glibc-2.17-326.el7_9.x86_64 libgcc-4.8.5-44.el7.x86_64 libstdc++-4.8.5-44.el7.x86_64\r\n(gdb) bt\r\n#0  0x00007ffff6b316a3 in std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) () from \/lib64\/libstdc++.so.6\r\n#1  0x0000000000401751 in app (trx=0x7fffffffe260) at \/app\/dev\/andreas\/PerfTest\/main.cpp:47\r\n#2  0x00000000004018d1 in main (argc=1, argv=0x7fffffffe398) at \/app\/dev\/andreas\/PerfTest\/main.cpp:104\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
C++ Performance Timer, uses the C++20 language standard cppreference.com Date and time utilities std::chrono::duration std::formatter std::put_time cplusplus.com Time library std::chrono::duration C++ Cross-Platform High-Resolution Timer chrono_literals is not a namespace-name How to get duration, as int milli’s and float seconds from ? Outputting Date and Time in C++ using std::chrono Print current system time in nanoseconds […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-14156","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/14156","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=14156"}],"version-history":[{"count":8,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/14156\/revisions"}],"predecessor-version":[{"id":14179,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/14156\/revisions\/14179"}],"wp:attachment":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}