Problem I didn’t expect sleep(seconds) to be super accurate, but I must admit I was surprised over how inaccurate it is. See a benchmark below. Relative error of 10% for sleep times under 0.01 seconds is quite a lot, and may cause potential issues in, e.g., real-time control loops. using Plots func…

https://github.com/JuliaLang/julia/issues/12770

Sleep also frees the main thread to do other asynchronous stuff, while I think calling usleep using ccall might be “blocking” so there is that to consider too.

I found this very good article about how Linux keeps time Measuring Latency in Linux - Confessions of a Wall Street Programmer How to accurately measure latency on Linux By a Wall Street programmer, so she/he should know about latency! I guess the HPET stuf…

Accuracy of sleep()

General Usage

baggepinnen August 24, 2017, 8:55pm 3

Thanks for the link!
usleep(usecs) = ccall(:usleep, Cint, (Cuint,), usecs)
seems way more accurate.

Is it necessary for sleep to allocate?

Topic		Replies	Views
Calling a function at a given time? General Usage	13	1111	September 11, 2017
[ANN] Timers.jl tic() toc() and accurate delays Package Announcements	3	601	May 22, 2022
Julia seems an order of magnitude slower than Python when printing to the terminal, because of issue with "sleep" General Usage performance	67	4709	June 28, 2024
Is it necessary for sleep to allocate? Performance multithreading	5	1570	April 2, 2022
How can `sleep(0.001)` error? General Usage question	14	645	June 27, 2024

Accuracy of sleep()

Related topics