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ce03a2ef1c
Storing the intermediate main cpio archive in a temporary file is not needed. The intermediate cpio archive can be directly piped into the compressor command. This reduces the execution time a bit and reduces the risk of the temporary directory (normally in `/var/tmp`) to run out of space. Benchmarks ---------- Benchmark on my desktop machine with an AMD Ryzen 7 5700G in a tmpfs chroot with Debian unstable on 2024-06-03. initramfs-tools 0.143: ``` $ schroot-wrapper -p initramfs-tools=0.143,initramfs-tools-core=0.143,linux-image-generic,firmware-linux,zstd,cryptsetup-initramfs,lvm2,kbd,mdadm,ntfs-3g,plymouth,console-setup,hyperfine -u root -c unstable (unstable)root@desktop:~# hyperfine "update-initramfs -u" Benchmark 1: update-initramfs -u Time (mean ± σ): 11.255 s ± 0.026 s [User: 12.467 s, System: 5.728 s] Range (min … max): 11.194 s … 11.282 s 10 runs (unstable)root@desktop:~# ls -l /boot/initrd.img-* -rw-r--r-- 2 root root 67758475 Jun 3 10:54 /boot/initrd.img-6.8.12-amd64 ``` This commit is significant faster and the generated initrd is roughly the same size: ``` $ schroot-wrapper -p ../initramfs-tools_0.143_all.deb,../initramfs-tools-core_0.143_all.deb,linux-image-generic,firmware-linux,zstd,cryptsetup-initramfs,lvm2,kbd,mdadm,ntfs-3g,plymouth,console-setup,hyperfine -u root -c unstable (unstable)root@desktop:~# hyperfine "update-initramfs -u" Benchmark 1: update-initramfs -u Time (mean ± σ): 10.283 s ± 0.029 s [User: 11.620 s, System: 5.785 s] Range (min … max): 10.230 s … 10.335 s 10 runs (unstable)root@desktop:~# ls -l /boot/initrd.img-* -rw-r--r-- 1 root root 67757960 Jun 3 10:53 /boot/initrd.img-6.8.12-amd64 ``` Benchmark on a Raspberry Pi Zero 2W with Debian unstable on 2024-06-03 and `COMPRESSLEVEL=1` set in `/etc/initramfs-tools/conf.d/compress.conf` due to the low memory. initramfs-tools 0.143: ``` $ schroot-wrapper -p initramfs-tools=0.143,initramfs-tools-core=0.143,linux-image-generic,firmware-linux,zstd,cryptsetup-initramfs,lvm2,kbd,mdadm,ntfs-3g,plymouth,console-setup,hyperfine -u root -c unstable (unstable)root@zero2w:~# hyperfine -r 10 "update-initramfs -u" Benchmark 1: update-initramfs -u Time (mean ± σ): 206.167 s ± 4.261 s [User: 53.232 s, System: 112.503 s] Range (min … max): 199.821 s … 210.960 s 10 runs (unstable)root@zero2w:~# ls -l /boot/initrd.img-* -rw-r--r-- 1 root root 83542031 Jun 3 12:13 /boot/initrd.img-6.8.12-arm64 ``` Same result here. This commit is significant faster and the generated initrd is roughly the same size: ``` $ schroot-wrapper -p ./initramfs-tools_0.143_all.deb,./initramfs-tools-core_0.143_all.deb,linux-image-generic,firmware-linux,zstd,cryptsetup-initramfs,lvm2,kbd,mdadm,ntfs-3g,plymouth,console-setup,hyperfine -u root -c unstable (unstable)root@zero2w:~# ls -l /boot/initrd.img-* -rw-r--r-- 1 root root 83540544 Jun 3 11:26 /boot/initrd.img-6.8.12-arm64 (unstable)root@zero2w:~# hyperfine -r 10 "update-initramfs -u" Benchmark 1: update-initramfs -u Time (mean ± σ): 175.592 s ± 5.514 s [User: 54.224 s, System: 112.979 s] Range (min … max): 166.502 s … 182.111 s 10 runs ``` Signed-off-by: Benjamin Drung <benjamin.drung@canonical.com>