Re: [PATCH V1][RFC] t/perf/p3400: speed up setup using fast-import

From: Tian Yuchen <a3205153416@gmail.com>
Date: Jan 28, 2026, 15:25 UTC
Message-ID: <CA+rU_o6+Q89_xJyhuuO20kbpmEttKW8oTf4XFGM=R7V4ZygawQ@mail.gmail.com>
In-Reply-To: <CA+rU_o7dZB=OCJHk9nGSbs4RLXmE9A3VUopa+6vF6oX0E9vxuQ@mail.gmail.com>

>...For this reason it is strongly recommended that users repack the repository with
>'git repack -a -d' after fast-import completes, allowing Git to reorganize the packfiles
>for faster data access...

After adding 'git repack -a -d', the time does changed:
                original(no change)        patch v1          NEW
     real           29.845                       18.081           22.231
rebase            13.34                         14.94            12.78

It seems that the 'git repack -a -d' line does reduce runtime. However, the total duration has seen a noticeable performance regression. I'm still trying to figure it out.

With regards, Yuchen