Send Multiplex Level

In the Send system, you can specify the number of instances of the Send processing that HULFT carries out at a time. The maximum number of instances of the Send processing that HULFT carries out at a time is called 'Send Multiplex Level.'

The types of Send Multiplex Level are as follows:

  • The Send Startup Task Count, which specifies the Send Multiplex Level for the entire Send system

  • The Send Process Multiplex Level by Host, which specifies the Send Multiplex Level for each host

Send Multiplex Level for Entire Send System

You can specify the Send Multiplex Level for the entire Send system with the Send Startup Task Count (TASK-CNT) in the System Environment Settings.

When the number of instances of the Send processing that HULFT carries out at a time exceeds the number that is set for the Send Startup Task Count, the extra Send File requests are written to the Send Control file (HULFT.QUEUE) as records in the Send Queue. The Send File requests that are placed in the Send Queue wait until the transfer currently in progress terminates and new transfer becomes possible.

Send Multiplex Level for Each Host

You can specify the Send Multiplex Level for each host by specifying the Send Process Multiplex Level by Host (HOSTSPSNUM) in the Host Information.

When the number of instances of the Send processing that HULFT carries out at a time exceeds the number that is set for the Send Process Multiplex Level by Host, the extra Send File requests are written to the Send Control file (HULFT.QUEUE) as records in the Send Queue. The Send File requests that are placed in the Send Queue wait until the transfer currently in progress terminates and new transfer becomes possible.

When you change the settings of the Send Process Multiplex Level by Host, the change will be applied when the Send File is executed or transfer terminates.

Even if the number of requests does not exceed the Send Process Multiplex Level by Host, if the number exceeds the Send Startup Task Count, the Send File requests that exceed the Send Startup Task Count are placed in the Send Queue. Set a value for the Send Process Multiplex Level by Host that is equal to or smaller than the value that is set for the Send Startup Task Count.

= Remarks =

For the multiplicity in the entire system, HULFT counts the number of all the send processing instances including the send processing instances of instant transfer.

For the multiplicity of send processing per host, HULFT counts the number of the send processing instances that use the management information. It does not apply to the number of send processing instances for instant transfer.

Figure 2.12 Send Startup Task Count and Send Process Multiplex Level by Host