How can I count operations in C++? I’d like to analyze code in a better way than just timing it since the time is often rounded to 0 millisec.
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How can I count operations in C++? I’d like to analyze code in a better way than just timing it since the time is often rounded to 0 millisec.
You can do precise measurements by reading the time-stamp-counter (tsc) of the CPU, which is incremented by one at each cpu-clock.
Unfortunately the read is done inlining some assembler instructions in the code. Depending on the underlying architecture the cost of the read varies between ~11(AMD) and ~33(Intel) tsc. With 1 Ghz CPU you can virtually have the nano-second precision.
In order to perform a reliable and non-invasive measure of a section of code you can:
Here you can find a quasi-portable C++ class I wrote for Linux, derived from the Linux kernel and designed to read tsc for the architectures i386, x86_64 and ia64.