MAXBG parameter: Difference between revisions
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<dd><var class="product">[[Sirius Mods]]</var> 7.0 | <dd><var class="product">[[Sirius Mods]]</var> 7.0 | ||
</dl> | </dl> | ||
==Description== | ==Description== | ||
This parameter specifies the maximum number of background or independent daemon | This parameter specifies the maximum number of background or independent daemon | ||
requests that may be running at once. | requests that may be running at once. | ||
Before <var class="product">Sirius Mods</var> 7.0, the only way to create a background daemon request was with | Before <var class="product">Sirius Mods</var> 7.0, the only way to create a background daemon request was with | ||
the $ | the <var>[[$CommBg]]</var> function. | ||
Under <var class="product">Sirius Mods</var> 7.0 and later, independent daemon requests can also be created | Under <var class="product">Sirius Mods</var> 7.0 and later, independent daemon requests can also be created | ||
using the Daemon class [[RunIndependently | using the <var>Daemon</var> class <var>[[RunIndependently (Daemon subroutine)|RunIndependently]]</var> method. | ||
Daemons running either as a result of RunIndependently or $ | Daemons running either as a result of <var>RunIndependently</var> or <var>$CommBg</var> are both counted | ||
the same way against the MAXBG limit. | the same way against the <var>MAXBG</var> limit. | ||
If a $ | If a <var>$CommBg</var> request would exceed the <var>MAXBG</var> limit (or there are no daemon threads | ||
immediately available to run the request) the request is enqueued and run later | immediately available to run the request) the request is enqueued and run later | ||
when daemon threads are available and the number of running background/independent | when daemon threads are available and the number of running background/independent | ||
requests drops below MAXBG. | requests drops below <var>MAXBG</var>. | ||
If a RunIndependently request would exceed the MAXBG limit, the request is cancelled. | If a <var>RunIndependently</var> request would exceed the <var>MAXBG</var> limit, the request is cancelled. | ||
The default value of MAXBG is the number of daemon (SDAEMDEV) threads divided by | The default value of <var>MAXBG</var> is the number of daemon (<var>[[SDAEMDEV parameter|SDAEMDEV]]</var>) threads divided by | ||
two or the number of threads minus 10, whichever is greater. | two or the number of threads minus 10, whichever is greater. | ||
For example, if there are 10 daemon threads defined in the Online, MAXBG defaults | For example, if there are 10 daemon threads defined in the Online, <var>MAXBG</var> defaults | ||
to 5. | to 5. | ||
If there are 40 daemon threads, MAXBG defaults to 30. | If there are 40 daemon threads, <var>MAXBG</var> defaults to 30. | ||
While there was no explicit MAXBG parameter before <var class="product">Sirius Mods</var> 7.0, the default MAXBG | While there was no explicit <var>MAXBG</var> parameter before <var class="product">Sirius Mods</var> 7.0, the default <var>MAXBG</var> was used "under the covers" by <var>$CommBg</var>, anyway. | ||
was used | |||
Setting MAXBG to a value greater than or equal to the number of daemon threads allows | Setting <var>MAXBG</var> to a value greater than or equal to the number of daemon threads allows | ||
background/independent requests to use up every available daemon thread, | background/independent requests to use up every available daemon thread, | ||
if they want. | if they want. | ||
Setting MAXBG to 0 indicates that the default value of MAXBG, calculated from the number | Setting <var>MAXBG</var> to 0 indicates that the default value of <var>MAXBG</var>, calculated from the number | ||
of daemon threads, is to be used. | of daemon threads, is to be used. | ||
This means that the lowest explicit value of MAXBG that will be honored is 1. | This means that the lowest explicit value of <var>MAXBG</var> that will be honored is 1. | ||
[[Category:System parameters]] | [[Category:System parameters]] | ||
[[Category:Parameters]] | [[Category:Parameters]] | ||
Latest revision as of 22:08, 25 August 2014
Maximum background/independent Daemons
Summary
- Default value
- Number of daemon (SDAEMDEV) threads divided by two, or number of daemon threads minus 10, whichever is greater
- Parameter type
- System
- Where set
- User 0 CCAIN parameters
- Related products
- All
- Introduced
- Sirius Mods 7.0
Description
This parameter specifies the maximum number of background or independent daemon requests that may be running at once. Before Sirius Mods 7.0, the only way to create a background daemon request was with the $CommBg function. Under Sirius Mods 7.0 and later, independent daemon requests can also be created using the Daemon class RunIndependently method. Daemons running either as a result of RunIndependently or $CommBg are both counted the same way against the MAXBG limit.
If a $CommBg request would exceed the MAXBG limit (or there are no daemon threads immediately available to run the request) the request is enqueued and run later when daemon threads are available and the number of running background/independent requests drops below MAXBG. If a RunIndependently request would exceed the MAXBG limit, the request is cancelled.
The default value of MAXBG is the number of daemon (SDAEMDEV) threads divided by two or the number of threads minus 10, whichever is greater. For example, if there are 10 daemon threads defined in the Online, MAXBG defaults to 5. If there are 40 daemon threads, MAXBG defaults to 30. While there was no explicit MAXBG parameter before Sirius Mods 7.0, the default MAXBG was used "under the covers" by $CommBg, anyway.
Setting MAXBG to a value greater than or equal to the number of daemon threads allows background/independent requests to use up every available daemon thread, if they want. Setting MAXBG to 0 indicates that the default value of MAXBG, calculated from the number of daemon threads, is to be used. This means that the lowest explicit value of MAXBG that will be honored is 1.