CODEWITHSUNDEEP
lua
topskip
topskip

Reputation: 17345

Why is loading this file slow

I have noticed that loading this file

https://raw.githubusercontent.com/kikito/sha1.lua/f607d523c133c08ab8e35cc6507e81273bb80053/sha1.lua

is very slow (using Lua 5.1).

#!/opt/homebrew/bin/lua
require("sha1")
print("Hello")

running this gives:

$ time ./test.lua 
Hello

real    0m0.774s
user    0m0.760s
sys     0m0.012s

When removing the require() line, it gets down dramatically:

$ time ./test.lua 
Hello

real    0m0.006s
user    0m0.002s
sys     0m0.003s

Which part is taking so long for the file to load?

Upvotes: 1

Views: 275

Answers (1)

John Zwinck
John Zwinck

Reputation: 249394

It says right in the file:

-- loading this file (takes a while but grants a boost of factor 13)
local PRELOAD_CACHE = true

Set that to false and it will load faster but run slower.

Upvotes: 4

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