Allow you to instrument code with traces, for invasive profiling. Portable, and economical. Compatible with chrome://tracing
- Linux, OSX Build Status:
- Windows Build Status:
Other similar implementations:
- minitrace at https://github.com/hrydgard/minitrace
Stable and maintained. Under development as needs arise.
This library offers you a series of macros supported by a C-based implementation to introduce timed traces inside your code. They may be used to debug your program and its threads and overwise measure the performance of groups of operations.
The library also reports its results into a JSON format compatible with the tracing user interface found in Google Chrome. These reports may be loaded inside chrome by going to chrome://tracing, which opens a dedicated interface for trace viewing.
The implementation is inspired by chrome's tracing capabilities yet was entirely written independently.
See: https://www.chromium.org/developers/how-tos/trace-event-profiling-tool
Include the src/spdr_*_unit.c file for your platform to your build.
Import spdr.h. Hopefully it is small and easy enough to understand.
You will initialize the library first, with your own memory buffer, enable the tracing to happen, then dump the results to disk in order to import them in chrome:tracing.
/* at program init */
assert(spdr_init(&spdr, spdr_buffer, spdr_buffer_size) == 0,
"could not initialize SPDR");
/* ... */
/* start a new recording */
spdr_enable_trace(spdr, TRACING_ENABLED);
/* ... */
/* stop recording and record result to disk */
FILE* file = fopen("trace.json", "rb");
spdr_report(spdr, SPDR_CHROME_REPORT, print, file);
fclose(file);
spdr_reset(spdr);
/* ... */
/* at program exit */
spdr_deinit(&spdr);Check examples/ for some typical uses.
SPDR_BEGIN1(spdr, "Main", "printf", SPDR_STR("format", "Hello, world."));
printf("Hello, world\n");
SPDR_END(spdr, "Main", "printf");With:
SPDR_BEGIN1(context, category, trace_name, argument);
SPDR_END(context, category, trace_name);This will trace the printf call and associate a textual argument to it.
Argument keys, categories and names are meant to be litteral or last for the duration of your instrument program, so as to limit their number. Traces where these values would grow with time would become hard to read and understand. Any time varying data should be kept in argument values (such as the "Hello, world." string above)
The library will also keep direct pointers to them for performance reasons, so make sure these strings are valid for the entire use of the library.
The string arguments however are copied so you may deallocate them. This is were your time-varying data should be stored.
Reporting may be done as the application is running or with less overhead at the end of a tracing period, using the reporting function. You are expected to provide I/O functions to allow the library to write into a file/console or even produce a network stream.
For instance the following example will produce a report into traces.json that can then be directly loaded in Chrome's tracing console.
static void report(const char* line, void* user_data)
{
FILE* file = user_data;
fputs(line, file);
}
static void foo()
{
/* ... */
FILE* f = fopen("traces.json", "wb");
if (f) {
spdr_report(gbl_spdr, SPDR_CHROME_REPORT, report, f);
fclose(f);
}This implementation is mostly comformant to ANSI C90, with common extensions, like the Long Long integer modifier.
It also makes use of C99's integer types. It does not use external dependencies besides a system's headers. This should let you compile on most platforms.
Tested platforms as of 2017-08:
-
Linux, GCC -
MacOSX, GCC and Clang -
Windows, Visual Studio 2015 -
Windows, Visual Studio 2017
You only need to compile one source file to add SPDR into your app, then simply import the headers found in include/ to use it.
Depending on your platform:
-
src/spdr_linux_unit.c (you need -lrt to link) -
src/spdr_osx_unit.c -
src/spdr_win32_unit.c -
src/spdr_win64_unit.c
Use of the library in C++ is supported, you must include the include/spdr/spdr.hh header rather than spdr.h.
During tracing, the library does not do any allocation of its own, and uses a simple linear allocator. This allows you to control precisely how much memory is reserved for the tracing of events and reduces overhead.
Arguments and traces are allocated on this pre-allocated memory arena.
During reporting, some dynamic allocations may be performed.
Use from multiple thread is supported and expected. Lock-free atomic operations are used thanks to Hans Boehm's atomic_ops library.
Traces are stored by linear allocation into a set of buckets so that concurrent accesses are as independant as possible. The number of buckets used is set at compile-time, and defaults to 8.
Tracing requires a monotonic clock with microsecond precision.
-
QueryPerformanceCounter is used for windows. -
CLOCK_MONOTONIC is used for Posix platforms, such as Linux. -
The native mach clock is used for MacOSX.
You may specify your own clock/timer function to return the current elapsed microseconds, overriding the default internal one.
See:
void spdr_set_clock_microseconds_fn(struct SPDR_Context *context,
unsigned long long (*clock_microseconds_fn)(void* user_data),
void *user_data);-
questor <questor@unseen-academy.de>
Simply submit a pull request on github. Run the pre-commit.sh script before-hand to ensure the code is well formatted.
Copyright (C) 2012 Nicolas Léveillé nicolas@uucidl.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
The following third-party code are used:
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Downloaded from: http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
Copyright (c) 2008-2009 Bjoern Hoehrmann bjoern@hoehrmann.de
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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MurmurHash3 was written by Austin Appleby, and is placed in the public domain. The author hereby disclaims copyright to this source code.