Finally the issue was with the hardware spec. The previous k8s test i did
with 3 node cluster with each node spec has 1cpu and 4Gig RAM.
Today i map the spec of the native tomcat test machine with the K8s node.
I created the new 3-node K8s cluster with version 1.6.9 with node
configuration 8CPU and 30Gig RAM each.
In this setup i see a consistent 8k Request/handling both in POD-POD
communication as well as from Loadbalancer Endpoints from K8s.
In the resource usage none of the cluster hitting the limit.CPU is well
with at max less than 13% usage on both the cluster.
When i see the CPU information from
lscpu
This is the CPU sec for the K8s node where we get the 2k req/sec numbers
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: 62
Model name: Intel(R) Xeon(R) CPU @ 2.50GHz
Stepping: 4
CPU MHz: 2500.000
BogoMIPS: 5000.00
Hypervisor vendor: KVM
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 30720K
NUMA node0 CPU(s): 0
Flags
===================================================================
This is the CPU sec for the K8s node where we get the 8k req/sec numbers
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 62
Model name: Intel(R) Xeon(R) CPU @ 2.50GHz
Stepping: 4
CPU MHz: 2500.000
BogoMIPS: 5000.00
Hypervisor vendor: KVM
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 30720K
NUMA node0 CPU(s): 0-7
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 pdpe1gb
rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc eagerfpu pni
pclmulqdq ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes xsave avx f16c rdrand
hypervisor lahf_lm fsgsbase tsc_adjust smep erms xsaveopt
I think the throughput all depends on the following CPU architecture i
guess.
Thread(s) per core:2,Core(s) per socket:4
Thanks for all your valuable suggestions.
On Tuesday, September 19, 2017 at 11:55:05 AM UTC+5:30, Vinoth Narasimhan
wrote:
>
> Environment:
>
> Kubernetes version (use kubectl version):
> kubectl version
> Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.3",
> GitCommit:"2c2fe6e8278a5db2d15a013987b53968c743f2a1", GitTreeState:"clean",
> BuildDate:"2017-08-03T07:00:21Z", GoVersion:"go1.8.3", Compiler:"gc",
> Platform:"linux/amd64"}
> Server Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.9",
> GitCommit:"a3d1dfa6f433575ce50522888a0409397b294c7b", GitTreeState:"clean",
> BuildDate:"2017-08-23T16:58:45Z", GoVersion:"go1.7.6", Compiler:"gc",
> Platform:"linux/amd64"}
>
> Cloud provider or hardware configuration**:
>
> Google Container Engine.
>
> What happened:
>
> We are in testing phase of springboot based microservice deployment on
> GKE. During testing QA filed a performance issue , stats that the
> throughput of the service in k8s is low when compared to run the java app in
>
> java -jar method
> docker run
> For testing i skip those springboot stuff and take native tomcat home page
> as the test bed for the "ab" testing.
>
> The test setup looks like:
>
> Create an 8cpu/30Gig RAM ubuntu server in GCP and install native
> tomact-8.5.20(80) and test the home page.
>
> Stop the native tomcat. Create the docker tomcat instances on the same
> host and test the same home page.
> The docker version is: Version: 17.06.2-ce
>
> Create the 3 node K8s cluster 1.6.9. Run the tomcat deployment the same
> 8.5.20 and expose the service through LB and test the same home page.
>
> I install the ab tool in other GCP instances and hit the above 3 different
> endpoints.
>
> What's the Result:
>
> The first 2 test with native tomcat and docker run the throughput i got is
> nearly 8k Req/sec on avg on different request/concurrent level.
>
> But the same on K8s LB the throughput i got on the average of 2k req/sec
> on avg on different request/concurrency level.
>
> Is this something am i missing on the test. Or this is how the GKE LB
> store and forward the request at this rate.
>
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