-2

I have a VM centos server. I recive many complaint from users, the server run slowly (it is a java application)

I execute this command to check free memory

[root@server ~]# free -g
              total        used        free      shared  buff/cache   available
Mem:             11           3           6           0           1           7
Swap:             9           0           9

and we have much of free memory (7Gb available and 6Gb free)

i check the CPU Consomation : it is 0%

[root@server ~]# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                3
On-line CPU(s) list:   0-2
Thread(s) per core:    1
Core(s) per socket:    3
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 94
Model name:            Intel(R) Xeon(R) CPU E3-1220 v5 @ 3.00GHz
Stepping:              3
CPU MHz:               2999.999
BogoMIPS:              5999.99
Hypervisor vendor:     Microsoft
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K
NUMA node0 CPU(s):     0-2
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl eagerfpu pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch fsgsbase bmi1 hle avx2 smep bmi2 erms rtm xsaveopt

any idea ?

[root@server ~]# vmstat 1 5
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 6359520   2108 1381056    0    0    42    11   21  292  1  0 99  0  0
 0  0      0 6359504   2108 1381060    0    0     0     0   35  801  0  0 100  0  0
 0  0      0 6359504   2108 1381060    0    0     0     0   31  762  0  0 100  0  0
 0  0      0 6359504   2108 1381060    0    0     0     0   32  763  0  0 100  0  0
 0  0      0 6359504   2108 1381060    0    0     0    12   28  761  0  0 100  0  0

closed as too broad by Rui F Ribeiro, Jeff Schaller, Mr Shunz, Thomas, RalfFriedl Jan 13 at 11:09

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • If your Java application's performance is disk I/O bound, or network I/O bound, the amount of free memory will be unimportant. Is the slow performance a new, recent, issue? Looking at the vmstat output, it does look like there is 100% disk I/O wait. – Kusalananda Jan 12 at 8:16
  • how i can resolve 100% disk i/o – YOU CHT LEE Jan 12 at 11:03

Browse other questions tagged or ask your own question.