Linux: How to indetify what consumes 35G of system memory

currently the processes of one of usr systems are consuming 6,5G RSS:

root@system:~# ps aux | awk 'BEGIN {sum=0} {sum +=$6} END {print sum/1024, "MB"}'
6575.42 MB
root@system:~#

If I run free -m it's telling me that 41G (43,9G - 2,1G) of memory are currently used:

root@system:~# free -m
              total        used        free      shared  buff/cache   available
Mem:          64402       43952       18322           0        2127       19735
Swap:        131070         129      130941
root@system:~#

So I miss ~35G of system memory!

Normally I expect a higher sum of rss because of the shared segments (not considered by ps)?!

How can I identify what is consuming my memory?

A reboot of the system is scheduled for the 6th...

grunix

Posted 2019-09-25T11:37:13.953

Reputation: 1

Answers

You can have a clear view of the system process and the related resources used installing the htop tool.

You can summarize the memory usage with the following command:

ps aux --sort -rss

Refer to the following link for further information on the topic: http://alvinalexander.com/linux/unix-linux-process-memory-sort-ps-command-cpu

alessiosavi

Posted 2019-09-25T11:37:13.953

Reputation: 235

This is not useful! Even using ps aux --sort -rss shows 6,5G RSS used! – grunix – 2019-09-25T14:26:19.567

Try with htop – alessiosavi – 2019-09-25T14:27:32.203

Same result using htop! :-/ If I sumarize the RSS i end up at ~6,5G. – grunix – 2019-09-25T14:34:27.947