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TIBCO iProcess® Engine 11.9.1

# EMPTYMBOXSLEEP

Message and Mbox Processing Configuration

## Summary

This attribute defines the number of milliseconds or seconds that a `BG` or `WISMBD` process remains idle when all Mbox queues in its Mbox set are empty.

## Applies To

This attribute can be set for the `BG`, `WISMBD` or ALL processes.

## Default Value

The attribute is assigned the following default value when iProcess Engine is installed.

Machine ID | Process | Instance | Value
0 | ALL | 0 | 2

## Notes

The value of the `EMPTYMBOXSLEEP` process attribute can be treated as the idle time either in seconds or in milliseconds:

| • | If the value of this attribute is up to (including) `60`, then it is treated as a measure of the time in seconds.

| • | If the value of this attribute is greater than `60`, then it is treated as a measure of the time in milliseconds.

Whenever a `BG` or `WISMBD` process requests a message from an empty Mbox, the `EMPTYMBOXSLEEP` value is incremented by the EMPTYMBOXSLEEP_INC value until either:

| • | the EMPTYMBOXSLEEP_MAX value is reached, or

| • | a message is returned from the Mbox, in which case `EMPTYMBOXSLEEP` is reset to its configured value.

By tailoring the values of these three attributes to your particular system configuration, you can avoid unnecessary system overhead resulting from polling for messages on empty queues.

You may notice a delay in processing messages if the system is very quiet and the EMPTYMBOXSLEEP value has increased to its maximum. For example:

| • | A user releases a work item just after the `BG` process has polled the Mbox. The message remains in the Mbox until the idle period has expired.

| • | The `BG` processes the release instruction and sends out the next work item. That message arrives in its Mbox just after the `WISMBD` process has polled it, and so remains there until the next idle period has expired.

In this way, there could be a delay between the work item being released and the next work item arriving of approximately twice the EMPTYMBOXSLEEP_MAX value, even though the system is otherwise idle.

## See Also

EMPTYMBOXSLEEP_INC, EMPTYMBOXSLEEP_MAX

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