timing

Python timing in order to trigger specific events

由 ♀尐吖头ヾ 提交于 2019-12-08 03:54:29
问题 In Python I would like to run a function calling a default action for 20 seconds. However, there are 5 specific timings within these 20 seconds when another function should be triggered. In order to simplify my code, I have replaced the "action" functions with simple printing commands. Here is what I have so far - The output seems ok, in that it lasts for 10 seconds and prints the time and the default state/action. But the triggered action is missing! Is there a better/correct way to do this?

Steady, accurate timing in Android

由 不想你离开。 提交于 2019-12-08 02:29:09
问题 I'm trying to create a music sequencer app for Android devices and would appreciate some advice as to how to achieve rock-solid timing functionality. If I pass a Runnable to Handler.postDelayed and specify a delay time of x milliseconds, is that Runnable guaranteed to be executed in exactly x ms time? If I can't achieve steady and accurate timing with Handler, what other options are open to me? Thank you in advance 回答1: I don't think "hard realtime" programming is possible. The options seem

Time Code in PLT-Scheme

由 房东的猫 提交于 2019-12-07 23:44:14
问题 I want to see how long a function takes to run. What's the easiest way to do this in PLT-Scheme? Ideally I'd want to be able to do something like this: > (define (loopy times) (if (zero? times) 0 (loopy (sub1 times)))) > (loopy 5000000) 0 ;(after about a second) > (timed (loopy 5000000)) Took: 0.93 seconds 0 > It doesn't matter if I'd have to use some other syntax like (timed loopy 5000000) or (timed '(loopy 5000000)) , or if it returns the time taken in a cons or something. 回答1: The standard

how to use \timing in postgres

由 不羁岁月 提交于 2019-12-07 11:41:46
问题 I want to know the time that it takes to execute a query in Postgres, I see a lot of response that propose to use \timing, but I'm newbie in Postgres and I don't know how to use it, can anyone help thank you in advance 回答1: You can use \timing only with the command line client psql , since this is a psql command. It is a switch that turns execution time reporting on and off: test=> \timing Timing is on. test=> SELECT 42; ┌──────────┐ │ ?column? │ ├──────────┤ │ 42 │ └──────────┘ (1 row) Time:

Time an external program whose output is being processed by Python

由 為{幸葍}努か 提交于 2019-12-07 08:47:26
问题 I want to measure the time of execution of an external program whose output is used by my Python script. Calling extprogram the program that produced the output, at the moment I do something like: import time import subprocess def process_output(line): ... ... return processed_data all_processed_data = [] ts = time.time() p = subprocess.Popen("extprogram", stdout=subprocess.PIPE) for line in p.stdout: all_processed_data.append(process_output(line)) te = time.time() elapsed_time = te - ts This

Inaccuracy in std::chrono::high_resolution_clock? [duplicate]

由 六月ゝ 毕业季﹏ 提交于 2019-12-07 06:30:31
问题 This question already has answers here : What are the uses of std::chrono::high_resolution_clock? (2 answers) Closed 2 years ago . So I was trying to use std::chrono::high_resolution_clock to time how long something takes to executes. I figured that you can just find the difference between the start time and end time... To check my approach works, I made the following program: #include <iostream> #include <chrono> #include <vector> void long_function(); int main() { std::chrono::high

Linux, need accurate program timing. Scheduler wake up program

由 瘦欲@ 提交于 2019-12-06 19:39:27
问题 I have a thread running on a Linux system which i need to execute in as accurate intervals as possbile. E.g. execute once every ms. Currently this is done by creating a timer with timerfd_create(CLOCK_MONOTONIC, 0) , and then passing the desired sleep time in a struct with timerfd_settime (fd, 0, &itval, NULL); A blocking read call is performed on this timer which halts thread execution and reports lost wakeup calls. The problem is that at higher frequencies, the system starts loosing

Python timing in order to trigger specific events

由 强颜欢笑 提交于 2019-12-06 15:45:06
In Python I would like to run a function calling a default action for 20 seconds. However, there are 5 specific timings within these 20 seconds when another function should be triggered. In order to simplify my code, I have replaced the "action" functions with simple printing commands. Here is what I have so far - The output seems ok, in that it lasts for 10 seconds and prints the time and the default state/action. But the triggered action is missing! Is there a better/correct way to do this? import random import time import numpy as np import itertools def uniform_min_range(a, b, n, min_dist)

Time Code in PLT-Scheme

由 空扰寡人 提交于 2019-12-06 10:33:10
I want to see how long a function takes to run. What's the easiest way to do this in PLT-Scheme? Ideally I'd want to be able to do something like this: > (define (loopy times) (if (zero? times) 0 (loopy (sub1 times)))) > (loopy 5000000) 0 ;(after about a second) > (timed (loopy 5000000)) Took: 0.93 seconds 0 > It doesn't matter if I'd have to use some other syntax like (timed loopy 5000000) or (timed '(loopy 5000000)) , or if it returns the time taken in a cons or something. The standard name for timing the execution of expressions in most Scheme implementations is "time". Here is an example

Steady, accurate timing in Android

由 左心房为你撑大大i 提交于 2019-12-06 06:20:47
I'm trying to create a music sequencer app for Android devices and would appreciate some advice as to how to achieve rock-solid timing functionality. If I pass a Runnable to Handler.postDelayed and specify a delay time of x milliseconds, is that Runnable guaranteed to be executed in exactly x ms time? If I can't achieve steady and accurate timing with Handler, what other options are open to me? Thank you in advance I don't think "hard realtime" programming is possible. The options seem to be to look for events that signal when something has happened. This can be done by creating your own flag,
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