Cpu issue php5-fpm

hello

i noticed that my server is slow at some point, with a help of top i noticed that the process that use cpu is

17660 webapp1 20 0 531492 234956 75932 R 17.3 3.9 0:36.75 php5-fpm
17184 webapp1 20 0 532580 236244 76084 R 17.0 3.9 1:26.70 php5-fpm
17207 webapp1 20 0 499972 202352 76084 R 17.0 3.4 1:21.12 php5-fpm
17257 webapp1 20 0 531716 235384 76084 R 17.0 3.9 1:11.60 php5-fpm
17756 webapp1 20 0 531020 231976 73476 R 17.0 3.9 0:23.74 php5-fpm
17239 webapp1 20 0 493904 197896 76060 S 11.6 3.3 1:33.77 php5-fpm

  • how to find out which webapp is causing troubles ?

  • when i use “link test app” integrity to test my website, i noticed that load average goes up to 5.0

any ideas if my performances are correct ?

my VPS is :

*** i have 6gb of ram (total 6gb)**

*** only 3gb of free SSD space (total 25gb)**

  • cpu

lscpu

Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 1
On-line CPU(s) list: 0
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 60
Model name: Intel Core Processor (Haswell, no TSX)
Stepping: 1
CPU MHz: 2394.430
BogoMIPS: 4788.86
Virtualization: VT-x
Hypervisor vendor: KVM
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 4096K

not sure where it is started … i can’t figure it out … recently i did upgrade via yunohost web interface

i have 8 Wordpress sites, they have small traffic, the most heavy traffic is on one website that has 20 users per hour.

i think it is my wordpress that use so much…
is there a way to debug and see what’s going on ?

i plan to desactivate plugins one by one and see changes