LB messages (v2)¶
Messages between Load Balancer (LB) and Federation Manager (FM)¶
The Load Balancer exchanges the following messages with the Federation Manager:
- LB.1 AllocateNode (from FM to LB)
- LB.2 Allocated (from LB to FM, in response to LB.1)
- LB.3 AllocationError (from LB to FM, in response to LB.1)
- LB.4 DeallocateNode (from FM to LB)
- LB.5 Deallocated (from LB to FM, in response to LB.3)
- LB.6 DeallocationError (from LB to FM, in response to LB.3)
LB.1 AllocateNode (from FM to LB) ¶
The Model sends this message as a response to RequestStatus messages sent by the Federate Starter or the Federation Manager.
| Variable | Fld | Type | Comments |
|---|---|---|---|
| modelId | 8 | String(9,10) | A unique indicator of the model for which allocation is asked |
| processors | 9 | Integer(2) | The number of processors to use for that process (often 1). |
| memory | 10 | String(9,10) | The amount of memory to reserve for the process, a number, possibly followed by kB, MB, GB, TB. |
LB.2 Allocated (from LB to FM, in response to LB.1) ¶
Message sent by the Model to indicate which Federate Starter can be allocated for the request (or none).
| Variable | Fld | Type | Comments |
|---|---|---|---|
| modelId | 8 | String(9,10) | The model id for which allocation is granted. |
| nameIP | 9 | String(9,10) | The name or IP address of the node that has been alocated/reserved for the model process. |
| fsPort | 10 | Integer(2) | The port number of the FederateStarter on the node that has been alocated/reserved for the model process. |
LB.3 AllocationError (from LB to FM, in response to LB.1) ¶
Message sent by the Model to indicate which Federate Starter can be allocated for the request (or none).
| Variable | Fld | Type | Comments |
|---|---|---|---|
| modelId | 8 | String(9,10) | The model id for which allocation is granted (or not). |
| error | 9 | String(9,10) | The reason the allocation could not take place, e.g.: - no node table. - no node with sufficient number of processors. - no node with sufficient available memory. |
LB.4 DeallocateNode (from FM to LB) ¶
| Variable | Fld | Type | Comments |
|---|---|---|---|
| modelId | 8 | String(9,10) | The model id for which deallocation can take place. |
LB.5 Deallocated (from LB to FM, in response to LB.4) ¶
| Variable | Fld | Type | Comments |
|---|---|---|---|
| modelId | 8 | String(9,10) | The model id for which deallocation has taken place. |
LB.6 DeallocationError (from LB to FM, in response to LB.4) ¶
| Variable | Fld | Type | Comments |
|---|---|---|---|
| modelId | 8 | String(9,10) | The model id for which deallocation could not be executed. |
| error | 9 | String(9,10) | The error message belonging to the unsuccessful deallocation, e.g.: - memory would go below zero. - number of processes would go below zero. - modelId cannot be found (e.g., because deallocaton took place multiple times). |