On Mon, Sep 12, 2022 at 10:45:05PM +0200, Christian Weisgerber wrote:
> $ time got up 
> Already up-to-date
>     0m22.21s real     0m04.38s user     0m09.26s system
> 
> It's a slow machine (APU2).
> So you're right, it's just the "got update" time.

> Looks like "got update" scales with the speed of the underlying
> hardware, which isn't that surprising. :-)

It is even slower on my APU2, which is running 7.1; hopefully 7.2 will
be faster with the mmap speedup that was committed. 

The attached profile trace graph suggests a bottleneck is in the open()
call in get_file_status(). We might be able to work around that somehow.

My test results below:

$ gotadmin info /git/ports.git | grep ^pack
pack files: 1
packed objects: 1750824
packed total size: 507M
$ cd /usr/ports/
$ got --version
got 0.76-current
$ time got update
Already up-to-date
    0m42.44s real     0m06.59s user     0m11.65s system
$ time got update 
Already up-to-date
    0m32.93s real     0m05.60s user     0m10.62s system
$ 

cpu0: AMD GX-412TC SOC, 998.25 MHz, 16-30-01

bios0 at mainbus0: SMBIOS rev. 3.0 @ 0xcfe81040 (13 entries)
bios0: vendor coreboot version "v4.16.0.3" date 04/21/2022
bios0: PC Engines apu2

sd0 at scsibus1 targ 0 lun 0: <ATA, SanDisk SSD U110, U21B> naa.5001b444a44c85f0
sd0: 15272MB, 512 bytes/sector, 31277232 sectors, thin

Performance adjustment mode: manual (1000 MHz)

• got-update.png (770K)