Hello systemd developers,
Currently, I am working on a task to reduce the boot time of an embedded
product. systemd is used as the init system. I have a couple of questions,
could you please clarify?
1. From the systemd-analyze plot, I am seeing that it takes around 2 seconds
to load the systemd unit files. Is there any way to reduce this time? I read a
blog about systemd-readahead and systemd-replay services used in such cases to
reduce the loading time, but it also have mentioned that the services are not
maintained in the latest systemd versions. Is it advisable to use such services?
2. There are some systemd services which are used mostly for debugging
purposes, so I tried to mask those services. My question is if the service is
masked , do the service files gets loaded during the systemd initialization? I
have masked around 5 services but I am not seeing any reduction in the systemd
unit files loading time though there is a considerable reduction in the overall
boot time.
3. I have read that the preferred way to have the mount points is to
write in /etc/fstab. This will create a *.mount file using
systemd_fstab_generator. I am seeing that in the project for the debugfs there
is a systemd mount file defined in /lib/systemd/system/ and also an option
present in /etc/fstab ('debugfs /sys/kernel/debug debugfs noauto 0 0').
Which file has precedence when the system is initialized?
/lib/systemd/system/sys-kernel-debug.mount
or
/run/systemd/generator/sys-kernel-debug.mount
Mit freundlichen Grüßen / Best regards
Vinothkumar Eswaran
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