Avaya Media Processing Server Series System (Software Release 2.1) Manual do Utilizador descarregar pdf (Página 236)

Avaya Media Processing Server Series System Reference Manual

Page 236 # P0602477 Ver: 3.1.11

Queuing Requests

When VTCPD receives a request from an application, it can either transmit it

immediately to the host (the default mode), or keep it locally until any previous

requests are answered.

In the former case, all requests are physically stored either on the host side or in the

kernel buffer (from which the host process reads only one message at a time from the

socket). If an application restarts before receiving the reply, this has no effect on the

host, which eventually retrieves and processes the request (which may possibly be

outdated at that time). The processing of outdated requests can further reduce limited

host resources. The reply for such a request is discarded by VTCPD, if the application

changes its ID each time it restarts.

In the latter scenario, if VTCPD holds requests locally, it can remove outdated

requests from the queue when applications timeout and restart. Note, that this is

useful only if the host is unable to process several messages simultaneously. The

command line option -q <#> specifies how many unanswered requests should be

sent to the host before queuing them locally. If the option is not specified (default), all

requests are immediately written to the host. When -q is specified, VTCPD

determines a proper link to the host and either sends the request or stores it in a queue,

specific to the link. When a reply comes from the host, VTCPD transmits the first

message from the queue to the host.

Another method is to maintain one global queue for all links. This is specified with the

-Q <#> option. This option causes all requests to go into a queue where they are

retrieved when the number of unanswered requests for any link becomes smaller than

the specified -Q <#> argument. The -m I option is implicitly added to the list of

command line arguments due to the fact that in this mode any request can be sent

through any link. (The option -m R, if specified, is disabled.)

If an application times out and restarts, executing a FREE request causes the removal

of all queued requests. Also, all line-related messages are removed from all queues

when the application issues a GET request.

vtcpd [{-q <#> | -Q <#>}]

Args: -q <#> Specifies how many unanswered requests go to the host before

requests are queued locally. Unless this option is specified, all

requests are immediately written to the host.

-Q <#> Specifies that all requests from all links are to be placed in a global

queue. When the number of unanswered requests for any link

becomes smaller than the specified value, the requests are

retrieved.

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Avaya Media Processing Server Series System (Software Release 2.1) Manual do Utilizador Página 236