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TIBCO Rendezvous® 8.7.0

# rvlat

Command

## Syntax

    rvlat  { cli | srv }
           [-service service ]
           [-network network ]
           [-daemon daemon ]
           [-sample response_rate]
           [-messages m ]
           [-time t ]
           [-size size ]
           [-batch batch_size ]
           [-interval interval ]
           [-inbox]
           [-vectored]
           [-terse]
           [-datapoints]
           [-spikes threshold ]
           [-w filename]
           [-h]

## Purpose

`rvlat` measures network latency. The client sends request messages to the server, and reports statistics to `stdout` and `stderr`. The server responds to client requests immediately.

## Outline

Each run consists of these steps:

Procedure

| 1. | Send a run of messages.

| 2. | Output statistics that measure the performance of the sender.

| 3. | Output statistics that measure the performance of each receiver (if any).

| 4. | Output a summary of error advisories pertaining to the sender.

Parameter | Description
## Mode Parameters
`cli` | Run a client instance.
`srv` | Run a server instance.
## Parameters that Apply to Both Client and Server
`-service` `service` | `service` is the service name or UDP port number that defines the service group. See Service Selection. When absent, the default value is `12486`.
`-network` `network` | `network` narrows the service group by selecting a local network by network name or IP network number (when the host computer has multiple network interfaces). It can also specify multicast addresses. See Network Selection. When absent, the default value is the multicast address`";224.1.1.5"`. On operating systems that do not support multicast addressing, you must supply a valid broadcast network address.
`-daemon` `daemon` | The `-daemon` parameter instructs the program about how and where to find `rvd` and establish communication. See Daemon Client Socket—Establishing Connections. You can specify a daemon on a remote computer. For details, see Remote Daemon. However, the program cannot start a remote daemon automatically—you must start it manually on the remote computer. Note that using a remote daemon could increase latency. When absent, the program finds the local daemon on TCP socket `50000`.
`-vectored` | Sending When `rvlat` sends messages in batches, it can send either individual messages (with `Send`) or message vectors (with `Sendv`). The `Send` and `Sendv` calls have different latency characteristics. You can use this parameter to test either call. When present, `rvlat` sends each batch of messages as a single vector (using the `Sendv` API call). When absent, `rvlat` sends each message using a separate `Send` call. Receiving When `rvlat` receives messages, it can dispatch them as individual messages, or as message vectors. You can use this parameter to test either paradigm. When present, `rvlat` receives messages with a vector listener. When absent, `rvlat` receives messages individually with an ordinary listener.
`-h` `-help` | When present, output a parameter usage list to `stdout`, and exit immediately.
Server-Only Parameters
`-sample` `response_rate` | For background information, see Measuring Technique. When present, the server uses a random number generator to select a subset of requests to which it responds, while ignoring all the rest. The value of `response_rate` specifies the probability of a response (as a percentage) for each message. When absent, the server responds to 100% of the request messages it receives. We do not recommend using `-sample` when measuring in serial mode.
Client-Only Parameters that Control Measuring
`-messages` `m` | When present, `rvlat` sends a run of `m` messages. When absent, the default is a run of 10,000 messages.
`-time` `t` | When present, `rvlat` sends a run of messages that continues for `t` seconds. When `-messages` is also present, `-time` overrides `-messages`. When absent, the default behavior sends a specific number of messages (rather than running for a specific time).
`-size` `size` | `rvlat` sends request messages with `size` bytes of payload data. Use this size to model application data rates. This size does not include message header data nor packet overhead. When absent, the default is 0 payload bytes in each message.
`-batch` `batch_size` | When present, `rvlat` sends messages in batches, with `batch_size` messages in each batch. When absent, `rvlat` sends messages serially, sending each request immediately after receiving a response to the previous request.
`-interval` `pause` | When `rvlat` sends messages in batches, it waits for `pause` seconds between the end of one batch and the start of the next batch. When absent, the default pause is 1 second. In serial mode (that is, when `-batch` is absent), `rvlat` ignores this parameter.
`-inbox` | When present, the client sends request messages to an inbox on the server (using point-to-point protocols). The server responds to an inbox on the client. When absent, the client sends request messages to a multicast subject (using either multicast or broadcast protocols, as specified in the `-network` parameter). The server responds to a multicast subject.
Client-Only Parameters that Control Output
`-terse` | The client can output two types of reports:
| • | A terse report with limited information, for import to spreadsheets
| • | A verbose, human-readable report
The two types of report include the same information, and both are in CSV format. When this option is present, `rvlat` outputs only a terse report to `stdout`. When absent, `rvlat` outputs two reports—a terse report to `stdout`, and a human-readable verbose report to `stderr`.
`-datapoints` | When present, `rvlat` outputs each round-trip data point (in milliseconds) to `stdout`. Caution: This option can generate an unwieldy volume of data.
`-spikes` `threshold` | When present, `rvlat` outputs data points greater than `threshold` to `stderr`. Each data point includes the round-trip time and the sequence number of the request message (within the run).
`-w` `filename` | When present, `rvlat` takes output data that would otherwise go to `stdout`, and instead writes it to the specified file for later analysis. If the file is not empty, `rvlat` appends the data at the end of the file. Output to `stderr` is not affected; see Output Streams.

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