Overhead, that’s the amount of power that’s needed to bring the hardware up to be able to do your work as well as put it back to sleep. And overhead is the energy that is required to bring up the radios and all the other system hardware which is required for your application to perform … Read more
A benchmark is something that measures the time for some whole operation. e.g. I/O operations per second under some workload. So the result is typically a single number, in either seconds or operations per second. Or a data set with results for different parameters, so you can graph it. You might use a benchmark to … Read more
Try adding this at the beginning of the file: # set the trace prompt to include seconds, nanoseconds, script name and line number # This is GNU date syntax; by default Macs ship with the BSD date program, which isn’t compatible PS4=’+$(date “+%s:%N”) %N:%i> ‘ # save file stderr to file descriptor 3 and redirect … Read more
This will only answer one part of the question (the most unhelpful part, unfortunately). I googled this up because I was looking for something to time queries and the sqlite3 client has a timer meta command. sqlite> .timer on from there on in, all query results will have cpu timer statistics appended. Hope this helps … Read more
It is heuristic cycle detection. You can turn it off from toolbar or from menu “View->Detect cycles” or “View->Do cycle detection”. Cycle is something like recursion, both direct ( f() -> f() -> f() where -> means call ) and indirect ( f()->g()->f()->g()->f()) Callgring format (used in kcachegrind) is not saving full call stack, it … Read more
gprof (read the paper) exists for historical reasons. If you think it will help you find performance problems, it was never advertised as such. Here’s what the paper says: The proļ¬le can be used to compare and assess the costs of various implementations. It does not say it can be used to identify the various … Read more