Linux – Interpreting last reboot output

linuxreboot

According to this webpage titled, “Linux Find Out Last System Reboot Time and Date Command” I can do last reboot | head -1 to see when my system was last rebooted. The output I get looks similar to the output they provide:

reboot   system boot  3.13.0-116-gener Thu Apr 13 14:12 - 20:09  (05:56)

My question is what does the 14:12 - 20:09 part mean? Does that mean the system began the reboot process at 2:12pm and ended at 8:09pm? Because that seems highly improbable to me.

Best Answer

Run last reboot -F and the output should be clearer. The -F option means:

Print full login and logout times and dates.

So those values show the timespan between reboots.

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Windows – Why did the computer reboot last night

Yes, simply "run"

eventvwr.msc

there you find your system logs with informations and errors

Linux – Interpreting output of cat/proc/cpuinfo

The entries are logical processors; objects used by the kernel internally, not necessarily tied to physical devices. (Note that they all have the same physical id.)

In other words, they represent the four cores of a single Intel i3 CPU.

Also, as noted on this post (which is not exactly a duplicate but closely related), those cores are logical as well – the CPU has two cores physically but supports hyperthreading.

Note that some Intel processors (the i5 included) use hyperthreading, a system where a single processor has (for example) 2 pyhsical cores, but will provide 4 logical cores - allowing the operating system to treat the processor as having more cores than it really does.

If your system has the lscpu tool (part of recent util-linux), it would output a more human-readable summary of the CPUs installed, for example:

Thread(s) per core:    2
Core(s) per socket:    2
Socket(s):             1

Best Answer

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Windows – Why did the computer reboot last night

Linux – Interpreting output of cat/proc/cpuinfo

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