Cheatsheet: Difference between revisions
→Check CPU, Memory and HDD
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== Check CPU, Memory and HDD ==
lscpu
lshw -C CPU
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cat /proc/cpuinfo | grep processor | wc -l
* The number of processors shown by /proc/cpuinfo might not be the actual number of cores on the processor.
* For example a processor with 2 cores and hyperthreading would be reported as a processor with 4 cores.
cat /proc/cpuinfo | grep 'core id'▼
▲ # cat /proc/cpuinfo | grep 'core id'
core id : 0
core id : 2
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core id : 3
▲So there are 4 different core ids. This indicates that there are 4 actual cores.
▲*Usage
top -o %CPU
htop
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sar 1 3 ==> yum install sysstat
iostat ==> yum install sysstat
; Top Command
CPU Section
us user cpu time % CPU time spent in user space
sy system cpu time % CPU time spent in kernel space
ni user nice cpu time % CPU time spent on low priority processes
id idle cpu time % CPU time spent idle
wa io wait cpu time % CPU time spent in wait (on disk)
hi hardware irq % CPU time spent servicing/handling hardware interrupts
si software irq % CPU time spent servicing/handling software interrupts
st steal time % CPU time stolen from a virtual machine
Main Section:
%MEM directly related to RES, percentage use of total physical memory by the process.
VIRT total memory that this process has access to shared memory, mapped pages, swapped out pages, etc.
RES total physical memory used shared or private that the process has access to.
SHR total physical shared memory that the process has access to.
RES is most close to the memory used by the process in memory, excluding what’s swapped out.
This includes the SHR (shared physical memory) which mean it could have been used by some other process as well.
;Obtain the PID with a utility:
pgrep -n python
pidof chrome - return all PIDs
pidof -s chrome - return only 1 PID
ps -C chrome -o pid= - C = CMD
;Memory
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;HDD
lsblk ==> List Block Devices only in a tree structure
du
df
== Check IP and DNS info ==
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