Lua: External Command Overheads Comparison

External Command Overheads Comparison.lua

-- git clone https://github.com/amekusa/humb.lua.git humb

local humb = require('humb')
local test = humb:new_test({
	rpt = 1000,
	digits = 4,
})

do
	local os_execute = os.execute
	local os_execute_arg = 'echo xxx'
	test:case('os.execute', function()
		os_execute(os_execute_arg)
	end)
end

do
	local fn_system = vim.fn.system
	local fn_system_arg = 'echo xxx'
	test:case('vim.fn.system', function()
		fn_system(fn_system_arg)
	end)
end

do
	local system = vim.system
	local system_arg = {'echo', 'xxx'}
	test:case('vim.system', function()
		system(system_arg):wait()
	end)
end

test:run()
test:print()


---- RESULTS ----
-- Repeats: 1000
-- #1: os.execute
--   Elapsed: 0.7508
--   Average: 0.0008
-- #2: vim.fn.system
--   Elapsed: 1.1293
--   Average: 0.0011
-- #3: vim.system
--   Elapsed: 1.0697
--   Average: 0.0011

Conclusion

os.execute() is the fastest.
vim.system() is slightly faster than vim.fn.system().