lsof command RHEL7

JoRedHat · 06-21-2018, 10:19 AM

Why is default output of lsof command different between RHEL6 and RHEL7?
We see more output from lsof | wc -l RHEL7 when compared to same command RHEL6

Can this safely be ignored? Is there technical article release difference output?

2.6.32-696.18.7.el6.x86_64
lsof revision: 4.82
ulimit -nH ; ulimit -nS
32767
32767
lsof | wc -l
5033

XXXXXXXXXXXXXXXXXXXXXXXXXXXXX

3.10.0-693.11.6.el7.x86_64
lsof revision: 4.87
ulimit -nH ; ulimit -nS
32767
32767
lsof | wc -l
248449

pan64 · 06-22-2018, 03:43 AM

see man lsof: In the absence of any options, lsof lists all open files belonging to all active processes.

What is your problem?

JoRedHat · 06-26-2018, 08:27 AM

There is no problem persay; more observation significant number of open files when compare RHEL6 and RHEL7 when same command is used.
So just concern since we run Webspere and set ulimit (hard and soft) for user, that's all, if we need to increase nofile limit as result of what appears to be increase of open files RHEL7. The open files for our our user account is significantly less so just tossing out there iin case know techincal write up reason lsof results differ RHEL6 and RHEL7 when simply run with no options.

pan64 · 06-26-2018, 08:37 AM

it highly depends on the number of running apps and their needs. I think you need to give us a precise description on how to reproduce these measurements. Also you can ask direcly RedHat, probably they have some information about it.