# Performance (self-compiled vs. distributed) 3 messages from 2025-09-03 to 2025-09-04. Participants: D. Ben Knoble, Ben Knoble. Thread: https://gitlist.dev/t/64085 ## D. Ben Knoble, 2025-09-03 20:31 Subject: Performance (self-compiled vs. distributed) Message-ID: URL: https://gitlist.dev/e/CALnO6CA3FkiOeF4w1TUf9S_UDTG_1iRxjEZcAkfrL_eqY%2BP26w%40mail.gmail.com ``` 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 Which differs somewhat from Homebrew's recipe (namely, Perl & Python path aren't set; nor is USE_LIBPCRE nor INSTALL_SYMLINKS… I'm ignoring the "extras" for now). I wouldn't particularly expect any of those to create an issue, though. Any tips on debugging this would be greatly appreciated. Some other tidbits: ls -lh@ {/usr/local,$HOME}/bin/git -rwxr-xr-x@ … 4.4M … ~/bin/git com.apple.provenance 11B -r-xr-xr-x@ … 3.5M … /usr/local/bin/git com.apple.provenance 11B I wondered if quarantining was at play, and this seems to indicate it isn't. It is interesting that my binary is so much bigger! Source I compiled: https://github.com/benknoble/git/tree/ps-jj PS I also noticed we put all the RelNotes in $prefix/share/doc/git-doc/RelNotes/*.adoc; I might have expected those to get turned into HTML, too? -- D. Ben Knoble ``` ## D. Ben Knoble, 2025-09-04 14:05 Subject: Re: Performance (self-compiled vs. distributed) Message-ID: URL: https://gitlist.dev/e/CALnO6CCEF75uriogAEd5LfORJ-m9OmDcF7ubu-U_xLWwxfZWTQ%40mail.gmail.com In-Reply-To: ``` On Wed, Sep 3, 2025 at 4:31 PM D. Ben Knoble wrote: > > I have an installation of Git at /usr/local/bin/git managed by > Homebrew. I'm also tinkering with building my own Git (+ patches) to > experiment with new features. Today I used "make install …" to get > that in ~/bin/git, but I'm noticing some performance problems. My > shell prompt started coming back slower, especially in a large > monorepo. > > For example, inside said monorepo (apologies in advance; output is on > a computer I can't easily copy from): > > hyperfine -Ni -w10 {/usr/local,$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 "$(nproc)" all doc > make install install-doc install-html Interesting. It was suggested off-list that I should try building with CFLAGS=-Oz, which I'm having some trouble propagating (with V=1, I see some initial files built with -Oz and then later some with -O2??). But on my other (non-corporate-managed) machine, I see almost no timing difference between a built Git and a Homebrew-installed Git. So I wonder if the corporate binary sniffer is causing problems… -- D. Ben Knoble ``` ## Ben Knoble, 2025-09-04 21:59 Subject: Re: Performance (self-compiled vs. distributed) Message-ID: URL: https://gitlist.dev/e/E66D04C7-BAA7-48EA-997C-2E399CEE769F%40gmail.com In-Reply-To: ``` > Le 4 sept. 2025 à 10:05, D. Ben Knoble a écrit : > > On Wed, Sep 3, 2025 at 4:31 PM D. Ben Knoble wrote: >> >> I have an installation of Git at /usr/local/bin/git managed by >> Homebrew. I'm also tinkering with building my own Git (+ patches) to >> experiment with new features. Today I used "make install …" to get >> that in ~/bin/git, but I'm noticing some performance problems. My >> shell prompt started coming back slower, especially in a large >> monorepo. >> >> For example, inside said monorepo (apologies in advance; output is on >> a computer I can't easily copy from): >> >> hyperfine -Ni -w10 {/usr/local,$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??) Fixed this, which helped with the binary size… > 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… …but not speed. Sigh. Assuming I can rule in or out the corporate parts, I’ll keep troubleshooting. Might try to install to the Homebrew paths just to see what happens. (I’m assuming the sniffer uses a fingerprint though and not just the path.) ```