After reading the accepted answer in When should we use prefetch? and examples from Prefetching Examples?, I still have a lot of issues with understanding when to actually use prefetch. While those...

I used to use a nice Apple profiler that is built into the System Monitor application. As long as your C++ code was compiled with debug information, you could sample your running application and it...

When I want to generate performance reports using perf-stat and perf-report from the Linux tool suite perf, I run: $ perf record -o my.perf.data myCmd $ perf report -i my.perf.data And: $ perf ...

I'm running the following code line on my terminal to get a profile of my program. python3 -m cProfile -s time main.py However the output it prints is gigantic. I only want to know the 10 most tim...

Problem: I have an J2EE application that is running very slow for a given task (to generate some files) using a specific data set. I decided to run the visualvm profiler over the application to und...

Question In Perf’s annotate view, the runtime consumed by each instruction is given on the left side as a percentage. Is there some option to have some absolute quantity (probably samples) displaye...

Through code profiling, I have found the Math.sqrt function specifically to be a major bottleneck in a large doubly-nested loop that runs every timestep in my program. Is there any way to improve i...

XDebug offers the configuration directive xdebug.profiler_enable_trigger that allows to activate profiling by passing the GET or POST parameter "XDEBUG_PROFILE" when calling a script via ...

I consider running VisualVM against a production JVM to see what's going on there - it started to consume too much CPU for some reason. It must not result in a JVM failure so I'm trying to estimat...

What method do you use when you want to get performance data about specific code paths?

I'm looking for a KCacheGrind alternative, or at least a binary package for macOS? I'd to use KCacheGrind with XDebug for PHP, but macOS is the right environnement here... Thank you Edit: I know I ...

I have a piece of JavaScript code that I am executing using the node.js interpreter. for(var i = 1; i < LIMIT; i++) { var user = { id: i, name: "MongoUser [" + i + "]" }; db.users.save(use...

I have a HotSpot JVM heap dump that I would like to analyze. The VM ran with -Xmx31g, and the heap dump file is 48 GB large. I won't even try jhat, as it requires about five times the heap memory...

How do I profile/benchmark an assynchronous Python script (which uses ASYNCIO)? I you would usualy do totalMem = tracemalloc.get_traced_memory()[0] totalTime = time.time() retValue = myFunction(...

So in Java, we can do How to measure time taken by a function to execute But how is it done in python? To measure the time start and end time between lines of code? Something that does this: import...

I am looking for a Java code profiler which I can use to profile my application (its a service which runs in backend) on production (so means low over head, and it must not slow down my appli...

After turning on profiling in MySQL SET profiling=1; I can run like a query like SELECT NOW(); and see profile results with it's execution time using: SHOW PROFILES; However, I can't figure...

Project Euler and other coding contests often have a maximum time to run or people boast of how fast their particular solution runs. With Python, sometimes the approaches are somewhat kludgey - i.e...

I want to use setitimer() (or less probable, the alarm()) in multithreaded process in linux 2.6+ with NPTL-enabled libc. Which thread will receive sigalarm (SIGALRM) from kernel? Thanks. 2014-04 ...

I am trying to profile a slow bash script. I have seen a few methods to do so in this question, but they all give absolute timings, or relative from one line to the next. I would like to have timin...

I have several points stored in an array. I need to find bounds of that points ie. the rectangle which bounds all the points. I know how to solve this in plain Python. I would like to know is the...

Are there methods to measure the execution time when built-in functions completed for Spreadsheet? When I use several built-in functions (For example, IMPORTHTML and IMPORTXML), if I know the avera...

I have a highly threaded program but I believe it is not able to scale well across multiple cores because it is already saturating all the memory bandwidth. Is there any tool out there which allow...

I'm using Visual Studio 2015. I'm trying to use Diagnostic Tools and somehow that window is always blank. There is nothing displayed in that window. There is no error too. I tried the same with emp...

The Flask app I am profiling spends a long time rendering its Jinja2 templates. I have installed flask lineprofilerpanel which is interesting but unfortunately does not let me drill down into the ...