Re: vim9 Benchmark

Gianmaria Bajo wrote:

> By the way, in that indent benchmark doesn't use lua as it would be done in
> neovim.
>
> For example (neovim 0.6.0)
>
> local getlines = vim.api.nvim_buf_get_lines
> local setlines = vim.api.nvim_buf_set_lines
> local exec = vim.cmd
>
> function LuaTest()
> local totallen = 0
> local start = vim.fn.reltime()
> exec 'new'
> exec 'call setline(1, range(100000))'
> local bnr = vim.fn.bufnr()
> local lines = getlines(bnr, 0, -1, false)
> for i = 1, 100000 do
> lines[i] = ' ' .. lines[i]
> totallen = totallen + lines[i]:len()
> end
> setlines(bnr, 0, -1, false, lines)
> exec ('echom ' .. totallen)
> exec ('echom ' .. vim.fn.reltimestr(vim.fn.reltime(start)))
> exec 'bwipe!'
> end
>
> gVim 8.2 (patch 4058)
>
> vim9script
>
> def g:VimTest(): void
> var totallen = 0
> var start = reltime()
> new
> call setline(1, range(100000))
> for i in range(1, 100000)
> setline(i, ' ' .. getline(i))
> totallen += len(getline(i))
> endfor
> echom totallen
> echom reltimestr(reltime(start))
> bwipe!
> enddef
>
> With nvim I get:
>
> :lua LuaTest()
> 888890
> 0.197217
>
> With gVim I get:
>
> :call VimTest()
> 888890
> 0.308830

The Lua version calls getlines() once, manipulates the array and then
has one call to setlines(), the Vim version calls getline() and
setline() for each line separately. That is not a good comparison.

The idea of the benchmark is to manipulate the text in the buffer, using
one setlines() call is not representing that. Perhaps it should be
changing only every second line.

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