Re: gnulib-tool.py speedup

[Collin Funk <collin.funk1@gmail.com>]

On 4/20/24 4:50 PM, Bruno Haible wrote:
> What I measure (with "GNULIB_TOOL_IMPL=sh time ./test-create-testdir-1.sh") is:
>   dash  22 sec
>   bash  20 sec

dash  31 sec
bash  28 sec

Similar here. Looks like my desktop is just older than I remembered
originally.

> I think that 'dash' is generally somewhat faster than 'bash'. However,
> gnulib-tool uses special bash syntax for appending to a list and for the
> module caching; this probably makes it faster with 'bash' than with 'dash',

Ah, I see. I remember seeing the associative arrays for module
caching. I haven't spent much time using shells outside of bash so I
don't know how common support for those extensions are.

> What matters most, in the comparison shell vs. Python, IMO, is the string
> processing [1].

Yes, I remember reading that email. Thank you for the detailed
explanation. I guess that would also explain the Cygwin speed too?
Since as far as I know Windows doesn't have fork() and deals with
creating processes differently. I assume the Cygwin implementation is
limited by that.

Collin