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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