| AlpsMsgContOrTerm  | 
 The message tag indicating that the send ask the recv to continue or terminate.  
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| AlpsMsgAskDonate  | 
 Ask the receiver worker to donor workload to the specified worker.  
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| AlpsMsgAskDonateToHub  | 
 Ask the receiver worker to donor workload to the specified hub.  
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| AlpsMsgAskHubShare  | 
 Aks the receiver hub to share workload with the specified hub.  
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| AlpsMsgFinishInit  | 
 The message tag indicating that initialization is finished.  
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| AlpsMsgHubLoad  | 
 Hub load, msg counts are in the buf.  
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| AlpsMsgAskLoad  | 
 The message tag indicating that the send ask the recv to send its load information.  
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| AlpsMsgAskPause  | 
 The message tag indicating that the send ask the recv to pause current work immediately or after finishing the work on hand.  
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| AlpsMsgAskTerminate  | 
 The message tag indicating that the send ask the recv to terminate.  
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| AlpsMsgIdle  | 
 The message tag indicating that the process sent the message is idle.  
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| AlpsMsgIncumbent  | 
 The message tag indicating that a incumbent is in the message buf.  
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| AlpsMsgLoadInfo  | 
 The message tag indicating that cluster and system workloads are in the message buf.  
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| AlpsMsgWorkerNeedWork  | 
 The message tag indicating that the sender has no workload.  
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| AlpsMsgModel  | 
 The message tag indicating that a model is being sent or received.  
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| AlpsMsgNode  | 
 The message tag indicating that a node is being sent or received.  
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| AlpsMsgParams  | 
 The message tag indicating that parameters are being sent or received.  
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| AlpsMsgTermCheck  | 
 Termination check.  
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| AlpsMsgHubCheckCluster  | 
 Hub check the status of its workers.  
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| AlpsMsgHubPeriodCheck  | 
 Hub periodically check the status of its workers.  
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| AlpsMsgHubPeriodReport  | 
 Hub periodically report its status to master.  
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| AlpsMsgHubStatus  | 
 Hub's status is in buf.  
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| AlpsMsgWorkerStatus  | 
 Worker's status is in buf.  
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| AlpsMsgHubTermStatus  | 
 Hub's status is in buf, used in termination checking.  
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| AlpsMsgWorkerTermStatus  | 
 Worker's status is in buf, used in termination checking.  
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| AlpsMsgSize  | 
 The size of the message.  
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| AlpsMsgSubTreeByMaster  | 
 Send or receive a subtree due to master load balancing.  
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| AlpsMsgSubTree  | 
 Send or receive a subtree due to hub load balancing.  
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| AlpsMsgNodeSize  | 
 Tree node size.  
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| AlpsMsgTellMasterRecv  | 
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| AlpsMsgTellHubRecv  | 
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| AlpsMsgIndicesFromMaster  | 
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| AlpsMsgWorkerAskIndices  | 
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| AlpsMsgForceTerm  | 
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| AlpsMsgMasterIncumbent  | 
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| AlpsMsgHubIncumbent  | 
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| AlpsMsgAskHubPause  | 
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| AlpsMsgAskDonateToWorker  | 
 Ask the receiver worker to donor workload to the specified worker.  
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| AlpsMsgSubTreeByWorker  | 
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| AlpsMsgIncumbentTwo  | 
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| AlpsMsgModelGenRampUp  | 
 The message tag indicating that knowledge generated during rampup about model is being sent or received.  
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| AlpsMsgModelGenSearch  | 
 The message tag indicating that knowledge generated during search about model is being sent or received.  
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| AlpsMsgHubFailFindDonor  | 
 When requested by master during inter balance, hub failed to identify a donor worker.  
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| AlpsMsgRampUpLoad  | 
 Load info during ramp up.  
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| AlpsMsgRampUpDonate  | 
 Donate during ramp up.  
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| AlpsMsgFinishInitHub  | 
 Hub finished ramp up.  
Used in spiral method.  
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| AlpsMsgErrorCode  | 
 Error code.  
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