Well, that is exactly what it is supposed to do. The easy way to fix
this is add more memory. A wildly impractical attempt to turn off memory
accounting will result in a really borked system that will suck up all
your time trying to recompile the kernel to make it work. Don't even go
down that road.
Memory is very cheap these days. Your time is one of the most valuable
commodities on the planet.
And oh, by the way - are you sure it is RAM you ran out of and not hard
drive space?
So my questions now become -
How much RAM do you have?
How much swap space?
What error message did you get?
Are you using something like top, htop, iotop, or glances to monitor
your system and discover the root cause of this problem.
Do you have SAR installed and enabled? You would also need to set the
granularity for 1 minute instead of the default 10.
What does SAR tell you?
From where (what device or medium) are you copying the data from and to?
But no matter how many questions you answer, my response will probably
still be the same - get more RAM. Or at least more of the limiting
resource -and that does sound like RAM right now.
On 03/10/2017 03:51 PM, Wensheng Deng wrote:
I have 3.10 kernel. I am running some data processing job, need to first
copy big (>5 GB) input files. The jobs were killed, because the system
thought I used 5 GB memory from the file copying.
On Fri, Mar 10, 2017 at 3:04 PM, David Both <dboth@xxxxxxxxxxxxxxxxxxxxxxxxx
wrote:
First - why in the world would you want to disable kernel memory
accounting? I don't think that is even possible (despite not being a kernel
programmer myself) because the kernel must needs account for every bit of
real and virtual memory in the system in order to do its job.
Second - the first note in the doc to which you refer says that it is
hopelessly out of date and further down it indicates it refers to 2.6
kernels and we are now at 4.9.
So now my question boils down to - what is it that you are trying to do
that makes you think you have to disable kernel memory accounting?
On 03/10/2017 02:25 PM, Wensheng Deng wrote:
Hi CentOS experts,
I am using CentOS 7. Trying to disable kernel memory accounting:
according to https://www.kernel.org/doc/Documentation/cgroup-v1/memory.
txt,
passing cgroup.memory=nokmem to the kernel at boot time, should be able
to
archive that.
However it is not the case in my exercise. These are what I have now
$ grep CONFIG_MEMCG_KMEM /boot/config-3.10.0-327.36.3.el7.x86_64
CONFIG_MEMCG_KMEM=y
$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.10.0-327.36.3.el7.x86_64
root=UUID=56568066-5719-46d9-981d-278c7559689b ro quiet
cgroup.memory=nokmem
systemd.log_level=debug
But kernel memory is still accounted in user's applications. Any
suggestion
on how to chase the issue is greatly appreciated! Thank you!
Best Regards,
Wensheng
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David P. Both, RHCE
Millennium Technology Consulting LLC
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919-389-8678
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www.databook.bz - Home of the DataBook for Linux
DataBook is a Registered Trademark of David Both
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"I'd put my money on the sun and solar energy. What a
source of power! I hope we don't have to wait until oil
and coal run out before we tackle that."
- Thomas Edison, in conversation with Henry Ford and
Harvey Firestone, 1931
*********************************************************
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*********************************************************
David P. Both, RHCE
Millennium Technology Consulting LLC
Raleigh, NC, USA
919-389-8678
dboth@xxxxxxxxxxxxxxxxxxxxxxxxx
www.millennium-technology.com
www.databook.bz - Home of the DataBook for Linux
DataBook is a Registered Trademark of David Both
*********************************************************
This communication may be unlawfully collected and stored by the National
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consent to the
retrieving or storing of this communication and any related metadata, as
well as
printing, copying, re-transmitting, disseminating, or otherwise using
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