Insert a time.sleep(0.01) to wait 10 millis between each time poll otherwise your loop polls time continuously without releasing power to the cpu. Edit: That is better, only waits once if needed. Should a huge CPU overload occur, the time to wait could be negative, and in that case 2 actions could be triggered at … Read more
If you mean in psql, rather than some program you are writing, use \? for the help, and see: \timing [on|off] toggle timing of commands (currently off) And then you get output like: # \timing on Timing is on. # select 1234; ?column? ———- 1234 (1 row) Time: 0.203 ms
The Mach kernel provides access to system clocks, out of which at least one (SYSTEM_CLOCK) is advertised by the documentation as being monotonically incrementing. #include <mach/clock.h> #include <mach/mach.h> clock_serv_t cclock; mach_timespec_t mts; host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock); clock_get_time(cclock, &mts); mach_port_deallocate(mach_task_self(), cclock); mach_timespec_t has nanosecond precision. I’m not sure about the accuracy, though. Mac OS X supports three … Read more
What you are experiencing is a Chrome bug (and even two). Basically, when the pool of requestAnimationFrame callbacks is empty, they’ll call it directly at the end of the current event loop, without waiting for the actual painting frame as the specs require. To workaround this bug, you can keep an ever-going requestAnimationFrame loop, but … Read more
I think this should work: #include <time.h> clock_t start = clock(), diff; ProcessIntenseFunction(); diff = clock() – start; int msec = diff * 1000 / CLOCKS_PER_SEC; printf(“Time taken %d seconds %d milliseconds”, msec/1000, msec%1000);
I just recently wrote an answer to a similar question SO: Eigen library with C++11 multithreading. As I’m interested in this topic too and already had working code at hand, I adapted that sample to OP’s task of matrix multiplication: test-multi-threading-matrix.cc: #include <cassert> #include <cstdint> #include <cstdlib> #include <algorithm> #include <chrono> #include <iomanip> #include <iostream> … Read more
If you are using c++11 or later you could use std::chrono::high_resolution_clock. A simple use case : auto start = std::chrono::high_resolution_clock::now(); … auto elapsed = std::chrono::high_resolution_clock::now() – start; long long microseconds = std::chrono::duration_cast<std::chrono::microseconds>( elapsed).count(); This solution has the advantage of being portable. Beware that micro-benchmarking is hard. It’s very easy to measure the wrong thing (like … Read more
It won’t necessarily run right away, neither will explicitly setting the delay to 0. The reason is that setTimeout removes the function from the execution queue and it will only be invoked after JavaScript has finished with the current execution queue. console.log(1); setTimeout(function() {console.log(2)}); console.log(3); console.log(4); console.log(5); //console logs 1,3,4,5,2 for more details see http://javascriptweblog.wordpress.com/2010/06/28/understanding-javascript-timers/
Update Aug. 2022: In modern Python 3, import time followed by time.monotonic_ns() might be sufficient. See my new answer to this other question here: High-precision clock in Python. At the time of my answer in 2016 using Python 3.1 on a Raspberry Pi, that didn’t exist. See https://docs.python.org/3/library/time.html#time.monotonic_ns. This is new in Python 3.7. I … Read more
This will hide the div after 1 second (1000 milliseconds). setTimeout(function() { $(‘#mydiv’).fadeOut(‘fast’); }, 1000); // <– time in milliseconds #mydiv{ width: 100px; height: 100px; background: #000; color: #fff; text-align: center; } <script src=”https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js”></script> <div id=”mydiv”>myDiv</div> If you just want to hide without fading, use hide().