%memused is high

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Operating Systems Linux Red Hat %memused is high
# 1  
%memused is high

All

I see cpu and memory usage are under control, only cache gets high upto 99% using sar -r command

I did echo3 and cleaned the drop caches

do we need to monitor this , why my application going high upto 99.8% memused in sar command , this is cache memory which is going high

will this cause any performance issues like slowness ?

I understand Kernel should manage this , so do I need to clean up manually ?

Please suggest
# 2  
Quote:
Originally Posted by anil529
will this cause any performance issues like slowness ?
No, on the opposite, using your RAM as cache is expected to improve your system performance.
Quote:
I understand Kernel should manage this , so do I need to clean up manually ?
No. Unused RAM is wasted RAM.
This User Gave Thanks to jlliagre For This Post:
# 3  
Thank you jlliagre

What I noticed could be other coincidence
App was responding toooo slow
CPU and memory were fine
Only cache is close to the ram size in terms of %memuser it is 99.8 %

So I dropped cache and then users were able to login app and work

This is happening once in a week

Any suggestions to look at something else other than cache for slownesss ?
Is 99.8% cache usage ok ?
# 4  
You shouldn't focus on a single metric and assume it is the key to performance. Better to provide everything useful for us to figure out what is going on on your system (hardware description, sizing, application used, full statistics output). In particular, not telling the fact users were unable to login in your first post didn't help.
This User Gave Thanks to jlliagre For This Post:
# 5  
Code:
# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             4
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Model name:            Intel(R) Xeon(R) CPU E5-2643 v2 @ 3.50GHz
Stepping:              4
CPU MHz:               3499.810
BogoMIPS:              6999.99
Hypervisor vendor:     VMware
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              25600K
NUMA node0 CPU(s):     0-3




paging  getconf PAGESIZE
4096


avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           2.85    0.05    0.51    0.07    0.00   96.53

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sdc               5.00       200.43        24.87   98583358   12234372
sda               0.47         1.97        26.50     970878   13033637
sdb               0.77        23.65        61.56   11632840   30280515
dm-0              0.08         1.41         0.15     692727      75933
dm-1              0.09         0.10         0.25      50168     122304
dm-2              5.84       224.08        86.44  110215182   42514888
dm-3              0.02         0.24         0.04     119390      21436
dm-4              0.09         0.05         0.47      26330     231148
dm-5              0.01         0.05         0.02      26430       9073
dm-6              0.00         0.01         0.00       4077       2060
dm-7              0.12         0.04         0.46      17428     225745
dm-8              0.17         0.01        24.98       3242   12288489
dm-9              0.02         0.01         0.07       5800      35801



Application is used to enter data and tracking , graphical representation



Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 02-21-2017 at 12:44 PM.. Reason: Added CODE tags.
# 6  
First off, you are running a hypervisor -VMware. No problems, but I do not understand the cpu queue length on a system that is doing almost nothing.

If your output ran from the base system, then nothing is going on system-wide.
Is this the base or one of the virtuals?

I am not well-versed with VMware, but there is a toolset, I believe, that will show what is going on on all of the virtuals and the base system as well.
This User Gave Thanks to jim mcnamara For This Post:
# 7  
Thank you very much again

Yes I am on VMWARE , don;t have access to base
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