These columns subdivide all messages sent and received into the type of message, where:
- Hash messages (Hash) are data sent to a destination through its primary or fallback hash value.
- Processor messages (Proc) are data sent to a destination through a vproc ID.
- Group messages (Group) are broadcasted messages to be received by members of a group.
- Local messages (Local) are messages communicated locally within the node.
- Channel messages (Chan) are data sent between vprocs through channel IDs for purposes of a private conversation to perform functions such as row redistribution, and so on.
- Mailbox messages (Mbox) are data sent between vprocs through mailbox IDs for similar purposes as channel messages.
A duplicated accounting is done with two different perspectives, since Hash + Proc + Group + Local messages = Chan + MBox messages.
| Column Name | Mode | Description | Data Type |
|---|---|---|---|
| MsgChanReads | count | Number of channel messages read by this vproc. | FLOAT |
| MsgChanWrites | count | Number of channel messages written by this vproc. | FLOAT |
| MsgHashReads | count | Number of hash messages read by this vproc. | FLOAT |
| MsgHashWrites | count | Number of hash messages written by this vproc. | FLOAT |
| MsgGroupReads | count | Number of group messages read by this vproc. | FLOAT |
| MsgGroupWrites | count | Number of group messages written by this vproc. | FLOAT |
| MsgLocalReads | count | Number of local messages read by this vproc. | FLOAT |
| MsgLocalWrites | count | Number of local messages written by this vproc. | FLOAT |
| MsgProcReads | count | Number of processor messages read by this vproc. | FLOAT |
| MsgProcWrites | count | Number of processor messages written by this vproc. | FLOAT |
| MsgMboxReads | count | Number of mailbox messages read by this vproc. | FLOAT |
| MsgMboxWrites | count | Number of mailbox messages written by this vproc. | FLOAT |