Re: Causes, cures and prevention of orphaned inodes?
- Date: Mon, 5 Feb 2018 10:15:21 +1300
- From: Ben Caradoc-Davies <ben@xxxxxxxxxxxx>
- Subject: Re: Causes, cures and prevention of orphaned inodes?
On 05/02/18 09:49, Stephen P. Molnar wrote:
They seem to happen when I am
running four or more apps at the same time.
I would never expect to see orphaned inodes except after a system crash
or kernel memory corruption. How did you test your CPU and RAM? Do you
see any other symptoms such as segfaults that could suggest memory
problems under concurrent load? How long have you seen this problem? I
see you are using ext4; are the inodes on these filesystems? ext4 is
very well tested and robust.
My preferred memory test for my 4-core (8-thread) Kaby Lake i7 is to run
concurrent "memtester" instances equal to the number of cores (4 in my
case), concurrent with "stress" equal to the number of cores ("stress -c
4" in my case). This workout detected memory problems not found by other
tools such as "memtest86+" or "mprime -t".
Other hardware issues to consider are overheating (addressed with better
cooling and thermald) and power supply problems which may only be
evident at load. Is your system prime stable (i.e. runs with "mprime -t"
(with AVX disabled) for many hours)? How do you monitor system temperature?
Ben Caradoc-Davies <ben@xxxxxxxxxxxx>
Transient Software Limited <https://transient.nz/>