Testing the Container Setup

About this task

Test that the Memory Machine container is managing memory correctly with HugePages enabled.

Procedure

Change to namespace injection.
```
$ oc project injection
$
```
Create a test pod using the included configuration file single-pod-model-test.yaml:
```
$ oc create -f deployment/single-pod-model-test.yaml
$
```

Attach the test pod:

$ oc exec -it mm-single-model-test-container -- bash
$

Check Memory Machine container usage:

$ oc get pods -o wide
NAME                 READY STATUS  RESTARTS AGE IP NODE                            NOMINATED NODE READINESS GATES 
memory-machine-4bh5m 1/1   Running 0        18h 10.0.0.214 osc-5k68w-worker-9c42p  <none>         <none> 
memory-machine-kjxpw 1/1   Running 0        18h 10.0.0.215 osc-5k68w-worker-jvd4p  <none>         <none> 
memory-machine-lmpk8 1/1   Running 0        18h 10.0.0.216 osc-5k68w-worker-7c4g5  <none>         <none> 
mm-single-model-test-container 1/1 Running 0 18h 10.0.0.215 osc-5k68w-worker-jvd4p <none>         <none>
$

Note the node on which the mm-single-model-test-container is running. In this case, the node is osc-5k68w-worker-jvd4p.
Note the pod in which the Memory Machine memory manager is running. In this case, the pod associated with node osc-5k68w-worker-jvd4p is memory-machine-kjxpw.

List the memory manager container on the current node. For this example:

$ oc exec -it memory-machine-kjxpw -- mvmcli container list \
  -s /tmp/memverge/dpme_daemon.0
Pod Namespace Pod Name                       Pod IP     Node Name              Date Started             Command 
----------------------------------------------------------------------------------------------------------------------------------- 
injection     mm-single-model-test-container 10.0.0.215 osc-5k68w-worker-jvd4p Wed Apr 21 01:02:46 2021 sleep
$

Show the PMEM used by the memory manager container on the current node. For this example:

$ oc exec -it memory-machine-kjxpw -- mvmcli show-usage -s /tmp/memverge/dpme_daemon.0
PMEM Usage: 
Total Dax 17177772032, Used Dax 12582912, License capacity 9895604649984 
Managed DRAM(MiB): Total 0.00, Used 0.00 (0.00) 
Managed PMEM(MiB): Total 16382.00, Used 12.00 (0.07) 
License capacity (MiB): 9437184.00
$

The PMEM used on the memory manager is 12MiB, indicating that it is managing 8MiB more than the initially allocated 4MiB.

Clean up the test environment using the supplied scripts:
1. Clean up the Memory Machine daemonSet, related resources, and test pod:
```
$ scripts/clean_single_pod.sh
$
```
2. Clean up the webhook and related resources:
```
$ ./scripts/clean_webhook.sh
$
```