Andrew Hodel andrewhodel

Importing net/http/pprof adds HTTP endpoints to an existing HTTP or HTTPS server to serve profile files that can be viewed or charted with a command line tool.

import pprof into the go program

import _ "net/http/pprof"

If your application is not already running an http or https server, add "net/http" to the program imports and the following code to your main function:

go http.ListenAndServe(":8550", nil)

This proves slices.Delete is the fastest method on x86-64 by CPU instruction count.

All methods usually report 0 nanoseconds when running these tests using time, that is why it tests by using CPU instruction count.

delete without order preserved
	 22 CPU instructions (speed)
delete using append with order preserved
	 1508 CPU instructions (speed)
delete using slices.Delete with order preserved

	# trim video file to a certain range of frames
	ffmpeg -i render0000-28914.mp4 -vf select="between(n\,0\,61),setpts=PTS-STARTPTS" one.mp4

	# display number of frames in a video file
	ffmpeg -i one.mp4 -f null /dev/null

	# add audio to video file at the start and extend the audio to the end of the video with silence
	ffmpeg -i one.mp4 -i electricity-zap.mp3 -filter_complex "[1:0]apad" -shortest test.mp4

	# add audio to video file and leave audio length as is, -stream_loop will loop the audio faster than the video with this file

	sudo systemctl status rc-local

	sudo systemctl enable rc-local

	sudo systemctl start rc-local

	sudo systemctl status rc-local

	# it doesn't start because /etc/rc.d/rc.local does not exist
	sudo ln -s /etc/rc.local /etc/rc.d/rc.local