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MDS does not fully meet our requirement as I have indicated that memory usage for each tasks are various. If we set slots based on memory, the result is either memory waste or memory exhaust. We would like to control at host level such as: symphony stop dispatching tasks to the host over memory threshold
MDS does not fully meet our requirement as I have indicated that memory usage for each tasks are various. If we set slots based on memory, the result is either memory waste or memory exhaust. We would like to control at host level such as: symphony stop dispatching tasks to the host over memory threshold
This functionality has been delivered, as of yesterday, via the release of Platform Symphony 7.1.1.
More information about how this use case is resolved in Symphony 7.1.1 by MDS native integration with SOAM application.
The original problem reported in this RFE:
- Computing resources on compute hosts are occupied by standby service processes, and cannot be used as regular idle compute node for other workload;
- The proposal requested in the RFE is to prevent tasks being scheduled to such hosts when available resources go below certain threshold
Why this "problem" existings:
- Customer needs to use Standby Service to reduce the service up and down cost;
- The Standby Service processes actually occupy significant computing resources (CPU/Memory);
- In slot based resource plan, the assumption of Standby Service feature is the standby process does not occupy obvious resources, which is different with the use case reported;
- So while the resources are occupied by standby service process, slot scheduler still think the resources are available to continue schedule workload on it
How MDS resolve this problem:
- In MDS scheduler, the resource occupied by Standby Services are recognized and will not be included as free available resources to be scheduled. So this problem does not exist.
.This capability is supported in v7.1.1 using MDS and docker integration.
The major difficulty is the memory of SI process up and down dramatically. It is hard to predict and define the number of standby services
Thanks
Nancy
The new MDS support in v7.1.1 will resolve this issue. The standby service can be defined in terms of memory and CPU, and it will consume the memory and cpu defined when running in standby mode, thus not over subscribing the node.
Creating a new RFE based on Community RFE #80355 in product Platform Symphony.