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SubjectRe: [PROBLEM] Very long .deb package build times for bindeb-pkg build target
Hi Mirsad,

On Thu 11 Jan 2024 13:22:39 GMT, Mirsad Todorovac wrote:
> Hi,
>
> With this new release, it seems that Debian kernel build uses "xz" in single-
> threaded mode:
>
> Tasks: 484 total, 2 running, 481 sleeping, 0 stopped, 1 zombie
> %Cpu(s): 2.5 us, 2.2 sy, 6.3 ni, 85.1 id, 2.3 wa, 0.0 hi, 1.7 si, 0.0 st
> MiB Mem : 64128.3 total, 524.3 free, 5832.0 used, 58540.9 buff/cache
> MiB Swap: 32760.0 total, 32758.7 free, 1.2 used. 58296.3 avail Mem
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
> COMMAND
>
> 978084 marvin 30 10 112440 97792 2432 R 100.0 0.1 29:30.23 xz
>
>
> Before dpkg-deb was using up to 3200% of CPU time on a 16 core SMT CPU.
>
> Can it be something with dpkg-deb --thread-max=%n option?

I cannot find any --thread-max option in Linux tree. Do you call
dpkg-deb manually or somehow induce a thread maximum?

> Waiting for half an hour just for the build of linux-image-...-dbg package
> seems like an overkill ...

With current v6.7 release tree I do not see the reported slow-downs
when building bindeb-pkg; I tested by cross-compiling for arm64 on
amd64 with CONFIG_MODULE_COMPRESS_XZ=y and =n).

Both take roughly 5mins on my 24-core i9 system.

Kind regards,
Nicolas
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