Subject Statistics
The subject table counts multicast and broadcast messages (not packets) and organizes statistics by Rendezvous subject name (in addition to UDP service and destination address).
Multicast Subject Statistics shows a subject table (from rvtrace -addrinfo). The text below introduces important concepts. Subjects Statistics—Column Headings describes the columns in detail.
Figure 162: Multicast Subject Statistics
The first row (immediately after the table and column headings) is a network total row; the word Totals in the Address column is a visual cue. This row shows the grand total of messages that rvtrace detected on the network during the interval.
The remaining rows display more fine-grained information about those messages—grouping them by UDP service, destination address, subject name, and source address.
A character string in the Subject column indicates the Rendezvous subject name for its row, and the group of rows that follow it. A blank in this column means that the row has the same subject as the row above, and is part of the same subtotal group. Notice how the pattern of subject names and blanks in the Subject column visually indicates the subtotal groups. The visual pattern of numbers in the Port column echoes this division.
Each subject subtotal group begins with a subject row (which is also a destination row) followed by one or more source rows.
* flags a row as a destination row. A blank (space character) in this column flags a row as a source row.
Each destination row is the heading and subtotal for the source rows that follow it. For example, consider the destination row with foo.1 in the Subject column. The Msgs column indicates 20 multicast messages. The two subsequent source rows indicate that those 20 messages came from two sources on the host 10.101.2.102—that is, SCid 39365 sent 10 messages, while 39364 sent another 10 messages. The subtotal 20 in turn contributes to the grand total 21 in the network total row.
A subject row governs the source rows below it (until the next subject row). That is, the subject, UDP service (port), and address in the governing row apply to those source rows. Similarly, the governing row address implies either multicast or broadcast protocol, and this protocol also applies to the statistics in the source rows that it governs. (Naturally, all of this information also applies to the governing row itself.)
In destination rows numbers in statistics columns count messages with the destination specified in the Address column.
In source rows numbers in statistics columns count messages originating from the IP address in the Address column.
In network total rows, numbers in statistics columns represent the message totals for the network during the interval.
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Column |
Description |
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In destination subtotal rows, this column contains a UDP port number indicating the Rendezvous service for the group of rows that it begins. In source rows this column is blank; the service in the nearest preceding destination row also applies to the source row. |
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* |
Asterisk ( Blank in this column indicates a source row. |
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In destination rows this column shows the destination address shared among a group of messages. It can be an IP address or a multicast group. In source rows this column shows the IP address from which group of messages originate. In network total rows, this column contains the word |
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Service communication ID. In source rows, this value differentiates the source of packets when several daemons or IPM instances on the same host computer reuse the same service port. Zero in this column indicates that the source is the only sender on that service and host. In destination rows this column is blank. |
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Rendezvous messages. This column shows the number of messages that use multicast or broadcast protocols. |
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Data bytes. This column sums the number of payload bytes over the messages (as counted in the Msgs column). |
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This column shows the Rendezvous subject name shared among the messages in a subtotal group. |