This is a personal memo. It will be updated from time to time as it has not been organized yet. (Operation check is centos 7.6)
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top
======================================================================= ●CPU
cat /proc/cpuinfo
○free
free -m
-m Display display results in megabytes. -s number of seconds Displayed every specified number of seconds. -t Also show total physical memory and snaps.
vmstat -n -S m
cat /proc/meminfo
MemTotal: 8069288 kB All physical memory recognized by the kernel MemFree: 6269572 kB Memory not used for any purpose
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| Buffers / Cached |
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| Active(file) / Inactive(file) | Shmem |
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Buffers + Cached = Active(file) + Inactive(file) + Shmem
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| Active(anon) + Inactive(anon) |
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| Shmem | AnonPages |??|
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Active(anon) + Inactive(anon) = Shmem + AnonPages
-----------------------------------------------------------------------------
| Buffers / Cached | AnonPages |??|
-----------------------------------------------------------------------------
| Active(file) + Inactive(file) | Active(anon) + Inactive(anon) |
-----------------------------------------------------------------------------
| | Shmem | |
-----------------------------------------------------------------------------
---------------------------------------------------------------------------------
| Buffers / Cached | AnonPages |??|
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| Active(file) + Inactive(file) | Unevictalbe | Active(anon) + Inactive(anon) |
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ps is not the actual memory usage of the process The amount of real memory that each process occupies when there is only one running process. (Usually dozens of processes run)
[How to measure actual memory usage of an application or process?][m1] [m1]:https://stackoverflow.com/questions/131303/how-to-measure-actual-memory-usage-of-an-application-or-process
ps aux
ps aux | grep postgre | awk '{sum += $6}END{print sum}'
Name Meaning VSZ (virtual set size) virtual memory RSS (Resident set size) Physical memory consumption Memory that the PSS (proportional set size) process actually owns USS (unique set size) Memory occupied by one process
○pmap -x
pmap -x <PID>
pmap -x 7876 7876: python3 Address Kbytes RSS Dirty Mode Mapping 0000000000400000 4 0 0 r-x-- python3.6 0000000000601000 4 4 4 r---- python3.6 0000000000602000 4 4 4 rw--- python3.6
○cat /proc/
ps -ef | grep [process name you want to check]
cat /proc/<pid>/smaps
cat /proc/7876/smaps 00400000-00401000 r-xp 00000000 fd:00 55039406 /usr/bin/python3.6 Size: 4 kB Rss: 0 kB Pss: 0 kB Shared_Clean: 0 kB Shared_Dirty: 0 kB Private_Clean: 0 kB Private_Dirty: 0 kB Referenced: 0 kB Anonymous: 0 kB AnonHugePages: 0 kB Swap: 0 kB KernelPageSize: 4 kB MMUPageSize: 4 kB Locked: 0 kB
Shared_Clean and Shared_Dirty are values shared with other processes The total of Private_Clean and Private_Dirty is the memory area allocated by each process.
cat /proc/<PID>/smaps | egrep 'Private_Clean|Private_Dirty' | awk '{sum += $2}END{print sum}'
cat /proc/1111/smaps | awk '/^Rss/{sum += $2}END{print sum}'
cat /proc/1111/smaps | awk '/^Pss/{sum += $2}END{print sum}'
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⇒ Capacity Physical storage Check the recognized device and its capacity
fdisk -l
Check partition capacity and file system
df -Th
What and how much space is being consumed in the mount directory
du -k
File unit
ls -l
● Storage (I / O) ○ Total of all I / O to all devices
vmstat
○ I / O reporting for each device Checking IOPS
iostat
cat /proc/diskstats
Bandwidth
iotop
○
blktrace
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○ IP address
ip -4 a
○ Routing table
route -rn
/proc/net/route
○ Communication
ping
nc -vz [ip] [port]
○ Number of bytes / packets sent / received, number of discarded packets, number of error packets
ifconfig
/proc/net/dev
/sys/class/net/$INTERFACE/statistics
○ Confirm in seconds iftop ifstat
○ Check network link-up status and recognition speed
ethtool
mii-tool
○ Confirmation of NIC used Check for each NIC and check which NIC is displayed
tcpdump -n -i eth0 dst port 9403 or src port 9403
tcpdump -n -i lo dst port 9403 or src port 9403
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lspci
/proc/<PID>/environ
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