On Wed, Sep 3, 2025 at 4:31 PM D. Ben Knoble <ben.knoble@xxxxxxxxx> wrote:
>
> I have an installation of Git at /usr/local/bin/git managed by
> Homebrew. I'm also tinkering with building my own Git (+ patches) to
> experiment with new features. Today I used "make install …" to get
> that in ~/bin/git, but I'm noticing some performance problems. My
> shell prompt started coming back slower, especially in a large
> monorepo.
>
> For example, inside said monorepo (apologies in advance; output is on
> a computer I can't easily copy from):
>
> hyperfine -Ni -w10 {/usr/local,$HOME}/bin/git
> …
> /usr/local/bin/git ran 4.99 +/- 1.69 times faster than ~/bin/git
>
> The difference is 22ms +/- 6.5ms (15.3ms–56.3ms) compared to 109.7ms
> +/- 17.8ms (91.1ms–159.9ms).
>
> My build recipe was
>
> export DEVELOPER=1
> export XML_CATALOG_FILES=/usr/local/etc/xml/catalog
> make -j "$(nproc)" all doc
> make install install-doc install-html
Interesting. It was suggested off-list that I should try building with
CFLAGS=-Oz, which I'm having some trouble propagating (with V=1, I see
some initial files built with -Oz and then later some with -O2??).
But on my other (non-corporate-managed) machine, I see almost no
timing difference between a built Git and a Homebrew-installed Git. So
I wonder if the corporate binary sniffer is causing problems…
--
D. Ben Knoble
