SCHDOFLS parameter - Revision history

DCameron: /* Summary */

2017-05-24T11:46:06Z

Summary

← Older revision		Revision as of 11:46, 24 May 2017
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	<dd>On User 0's parameter line or reset by system manager.		<dd>On User 0's parameter line or reset by system manager.
	<dt>Related products		<dt>Related products
	<dd><var>[[Performance_monitoring_and_tuning#Offloading_Model_204_work_to_zIIP_processors\|M204 HPO]]</var>		<dd><var>[[Performance_monitoring_and_tuning#Offloading_Model_204_work_to_zIIP_processors\|M204 HPO]]</var> and <var>[[MP/204#Multiprocessing_.28MP.2F204.29\|MP/204]]</var>
	<dt>Introduced		<dt>Introduced
	<dd><var class="product">Model 204 V7.7</var>		<dd><var class="product">Model 204 V7.7</var>

DCameron: /* Description */

2017-05-24T11:44:15Z

Description

← Older revision		Revision as of 11:44, 24 May 2017
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	On a z/OS system, <var class="product">Model 204</var> [[Performance monitoring and tuning#Offloading Model 204 work to zIIP_processors\|zIIP support]] enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors. <var>SCHDOFLS</var> specifies both of the following: </p>		On a z/OS system, <var class="product">Model 204</var> [[Performance monitoring and tuning#Offloading Model 204 work to zIIP_processors\|zIIP support]] enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors. <var>SCHDOFLS</var> specifies both of the following: </p>
	<ul>		<ul>
	<li>The target number of threads on the zIIP offload queue before a non-SRB MP subtask is dispatched to help the zIIP subtasks. </li>		<li>The target number of threads on the zIIP offload queue before a non-SRB <var>[[MP/204#Multiprocessing_.28MP.2F204.29\|MP]]</var> subtask is dispatched to help the zIIP subtasks. </li>

	<li>If started, how aggressively non-SRB MP subtasks pick up work from the zIIP offload queue. </li>		<li>If started, how aggressively non-SRB MP subtasks pick up work from the zIIP offload queue. </li>

DCameron: /* Summary */

2017-05-24T11:42:03Z

Summary

← Older revision		Revision as of 11:42, 24 May 2017
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	<dd>On User 0's parameter line or reset by system manager.		<dd>On User 0's parameter line or reset by system manager.
	<dt>Related products		<dt>Related products
	<dd>~~All~~		<dd><var>[[Performance_monitoring_and_tuning#Offloading_Model_204_work_to_zIIP_processors\|M204 HPO]]</var>
	<dt>Introduced		<dt>Introduced
	<dd><var class="product">Model 204 V7.7</var>		<dd><var class="product">Model 204 V7.7</var>

JAL: wordsmithing

2016-08-05T00:25:45Z

wordsmithing

← Older revision		Revision as of 00:25, 5 August 2016
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	</ul>		</ul>
	<p>		<p>
	<var>[[SCHDOFL parameter\|SCHDOFL]]</var> and <var>[[SCHDOFLZ parameter\|SCHDOFLZ]]</var> control the scheduling of ~~zIIP/~~SRB ~~and non-~~zIIP~~/non-SRB MP~~ subtasks. </p>		<var>[[SCHDOFL parameter\|SCHDOFL]]</var> and <var>[[SCHDOFLZ parameter\|SCHDOFLZ]]</var> control the scheduling of MP and SRB (zIIP) subtasks. </p>

	[[Category:System parameters]]		[[Category:System parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

JAL: /* Description */ add link

2016-08-05T00:11:08Z

Description: add link

← Older revision		Revision as of 00:11, 5 August 2016
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	This parameter applies to z/OS only.</p>		This parameter applies to z/OS only.</p>
	<p>		<p>
	On a z/OS system, <var class="product">Model 204</var> zIIP support enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors. <var>SCHDOFLS</var> specifies both of the following: </p>		On a z/OS system, <var class="product">Model 204</var> [[Performance monitoring and tuning#Offloading Model 204 work to zIIP_processors\|zIIP support]] enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors. <var>SCHDOFLS</var> specifies both of the following: </p>
	<ul>		<ul>
	<li>The target number of threads on the zIIP offload queue before a non-SRB MP subtask is dispatched to help the zIIP subtasks. </li>		<li>The target number of threads on the zIIP offload queue before a non-SRB MP subtask is dispatched to help the zIIP subtasks. </li>

JAL: minor formatting

2016-07-28T16:14:18Z

minor formatting

← Older revision		Revision as of 16:14, 28 July 2016
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	This parameter applies to z/OS only.</p>		This parameter applies to z/OS only.</p>
	<p>		<p>
	On a z/OS system, <var class="product">Model 204</var> zIIP support enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors.~~</p>~~		On a z/OS system, <var class="product">Model 204</var> zIIP support enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors. <var>SCHDOFLS</var> specifies both of the following: </p>
	~~<p>~~
	<var>SCHDOFLS</var> specifies both of ~~these~~: </p>
	<ul>		<ul>
	<li>The target number of threads on the zIIP offload queue before a non-SRB MP subtask is dispatched to help the zIIP subtasks. </li>		<li>The target number of threads on the zIIP offload queue before a non-SRB MP subtask is dispatched to help the zIIP subtasks. </li>

JAL: minor formatting

2016-07-28T16:11:52Z

minor formatting

← Older revision		Revision as of 16:11, 28 July 2016
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	<dd><var class="product">Model 204 V7.7</var>		<dd><var class="product">Model 204 V7.7</var>
	</dl>		</dl>

	==Description==		==Description==
	<p>~~Applies~~ to z/OS only</p>		<p>
	<p>On a z/OS system, <var class="product">Model 204</var> zIIP support enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors.</p>		This parameter applies to z/OS only.</p>
	<p>SCHDOFLS specifies ~~the~~ target number of threads on the zIIP offload queue before a non-SRB MP subtask ~~will be~~ dispatched to help the zIIP subtasks ~~and, if~~ started, how aggressively ~~the~~ non-SRB MP subtasks ~~will~~ pick up work from the zIIP offload queue. Setting a higher value of <var>SCHDOFLS</var> ~~will make~~ the non-SRB MP subtasks more reticent to help SRB subtasks out, ensuring better zIIP offload though possibly adversely affecting performance should the zIIPs get overloaded.</p>		<p>
	<p>The default value of 2 means that if all zIIP subtasks are active and there are more than <var>SCHDOFLS</var> ~~times~~ <var>AMPSUBZ</var> units of work on the zIIP offload queue, a non-SRB MP subtask ~~will be~~ dispatched as needed and ~~will perform~~ work intended for zIIPs.		On a z/OS system, <var class="product">Model 204</var> zIIP support enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors.</p>
	. </p>		<p>
	<p>SCHDOFLS has no effect if zIIP SRBs are not in use in an Online (NMPSUBZ=0) ~~or if the~~ number of active SRBs (AMPSUBZ) is set to 0 ~~or if~~ MP subtasks are not allowed to take work from zIIPs ([[SCHDOPT parameter\|SCHDOPT]] X'40' is set).</p>		<var>SCHDOFLS</var> specifies both of these: </p>
	<p>~~The~~ [[SCHDOFL parameter]] and [[SCHDOFLZ parameter]] control the scheduling of zIIP/SRB and non-zIIP/non-SRB MP subtasks.		<ul>
			<li>The target number of threads on the zIIP offload queue before a non-SRB MP subtask is dispatched to help the zIIP subtasks. </li>

			<li>If started, how aggressively non-SRB MP subtasks pick up work from the zIIP offload queue. </li>
			</ul>
			<p>
			Setting a higher value of <var>SCHDOFLS</var> makes the non-SRB MP subtasks more reticent to help SRB subtasks out, ensuring better zIIP offload (though possibly adversely affecting performance should the zIIPs get overloaded).</p>
			<p>
			The default value, 2, means that if all zIIP subtasks are active and there are more than <code><var>SCHDOFLS</var> * <var>AMPSUBZ</var></code> units of work on the zIIP offload queue, a non-SRB MP subtask is dispatched as needed and performs work intended for zIIPs. </p>
			<p>
			<var>SCHDOFLS</var> has no effect if any of these is true: </p>
			<ul>
			<li>zIIP SRBs are not in use in an Online (<var>[[NMPSUBZ parameter\|NMPSUBZ]]</var> is 0).</li>

			<li>The number of active SRBs (<var>[[AMPSUBZ parameter\|AMPSUBZ]]</var>) is set to 0.</li>

			<li>MP subtasks are not allowed to take work from zIIPs (<var>[[SCHDOPT parameter\|SCHDOPT]]</var> X'40' is set).</li>
			</ul>
			<p>
			<var>[[SCHDOFL parameter\|SCHDOFL]]</var> and <var>[[SCHDOFLZ parameter\|SCHDOFLZ]]</var> control the scheduling of zIIP/SRB and non-zIIP/non-SRB MP subtasks. </p>

	[[Category:System parameters]]		[[Category:System parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

Alex: Created page with "{{Template:SCHDOFLS parameter subtitle}} ==Summary==

Default value
2
Parameter type
System
Where set
On User 0's parameter line or reset by system..."

2016-07-28T00:40:50Z

Created page with "{{Template:SCHDOFLS parameter subtitle}} ==Summary== <dl> <dt>Default value <dd>2 <dt>Parameter type <dd>System <dt>Where set <dd>On User 0's parameter line or reset by system..."

New page

{{Template:SCHDOFLS parameter subtitle}}
==Summary==
<dl>
<dt>Default value
<dd>2
<dt>Parameter type
<dd>System
<dt>Where set
<dd>On User 0's parameter line or reset by system manager.
<dt>Related products
<dd>All
<dt>Introduced
<dd><var class="product">Model 204 V7.7</var>
</dl>
==Description==
Applies to z/OS only
On a z/OS system, <var class="product">Model 204</var> zIIP support enables you to offload <var class="product">Model 204</var> work from regular processors to zIIP processors.
SCHDOFLS specifies the target number of threads on the zIIP offload queue before a non-SRB MP subtask will be dispatched to help the zIIP subtasks and, if started, how aggressively the non-SRB MP subtasks will pick up work from the zIIP offload queue. Setting a higher value of <var>SCHDOFLS</var> will make the non-SRB MP subtasks more reticent to help SRB subtasks out, ensuring better zIIP offload though possibly adversely affecting performance should the zIIPs get overloaded.
The default value of 2 means that if all zIIP subtasks are active and there are more than <var>SCHDOFLS</var> times <var>AMPSUBZ</var> units of work on the zIIP offload queue, a non-SRB MP subtask will be dispatched as needed and will perform work intended for zIIPs.
. 
SCHDOFLS has no effect if zIIP SRBs are not in use in an Online (NMPSUBZ=0) or if the number of active SRBs (AMPSUBZ) is set to 0 or if MP subtasks are not allowed to take work from zIIPs ([[SCHDOPT parameter|SCHDOPT]] X'40' is set).
The [[SCHDOFL parameter]] and [[SCHDOFLZ parameter]] control the scheduling of zIIP/SRB and non-zIIP/non-SRB MP subtasks.
[[Category:System parameters]]
[[Category:Parameters]]

SCHDOFLS parameter - Revision history

DCameron: /* Summary */

DCameron: /* Description */

DCameron: /* Summary */

JAL: wordsmithing

JAL: /* Description */ add link

JAL: minor formatting

JAL: minor formatting

Alex: Created page with "{{Template:SCHDOFLS parameter subtitle}} ==Summary== Default value 2 Parameter type System Where set On User 0's parameter line or reset by system..."

Alex: Created page with "{{Template:SCHDOFLS parameter subtitle}} ==Summary==

Default value
2
Parameter type
System
Where set
On User 0's parameter line or reset by system..."