CDMAXP2X parameter - Revision history

DCameron: /* Summary */

2014-10-13T14:45:46Z

Summary

← Older revision		Revision as of 14:45, 13 October 2014
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	<dd>All		<dd>All
	<dt>Introduced		<dt>Introduced
	<dd><var class="product">Model 204 V6.1</var> ~~or earlier~~		<dd><var class="product">Model 204 V6.1</var>
	</dl>		</dl>

	==Description==		==Description==
	<p>The CDMAXP2X parameter indicates the maximum number, in powers of 2, of 6K pages allocated in virtual storage that will be used for the TBO constraints log, and in CCATEMP, if CDMAXP2X is greater than <var>[[CDMINP2X parameter\|CDMINP2X]]</var>. These pages are permanently allocated during initialization. Pages are compacted until their number exceeds CDMAXP2X. </p>		<p>The CDMAXP2X parameter indicates the maximum number, in powers of 2, of 6K pages allocated in virtual storage that will be used for the TBO constraints log, and in CCATEMP, if CDMAXP2X is greater than <var>[[CDMINP2X parameter\|CDMINP2X]]</var>. These pages are permanently allocated during initialization. Pages are compacted until their number exceeds CDMAXP2X. </p>

ELowell: /* Description */

2013-11-15T16:27:06Z

Description

← Older revision		Revision as of 16:27, 15 November 2013
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	</dl>		</dl>
	==Description==		==Description==
	<p>The CDMAXP2X parameter indicates the maximum number-in powers of 2-of 6K pages allocated in virtual storage that will be used for the TBO constraints log, and in CCATEMP, if CDMAXP2X is greater than CDMINP2X. These pages are permanently allocated during initialization. Pages are compacted ~~till~~ their number exceeds CDMAXP2X. </p>		<p>The CDMAXP2X parameter indicates the maximum number, in powers of 2, of 6K pages allocated in virtual storage that will be used for the TBO constraints log, and in CCATEMP, if CDMAXP2X is greater than <var>[[CDMINP2X parameter\|CDMINP2X]]</var>. These pages are permanently allocated during initialization. Pages are compacted until their number exceeds CDMAXP2X. </p>
	<p>When a constraints page becomes almost full it is split into two pages. When the number of pages exceeds 2**CDMAXP2X, the splitting process stops and records grow into overflow pages that never split, but may be merged when they become too empty. Overflow pages are not compacted, because they do not have basic records and thus do not ~~participated~~ in hashing. The only way to find data on overflow pages is to look through all cells.</p>		<p>When a constraints page becomes almost full, it is split into two pages. When the number of pages exceeds 2**CDMAXP2X, the splitting process stops and records grow into overflow pages that never split, but may be merged when they become too empty. Overflow pages are not compacted because they do not have basic records and thus do not participate in hashing. The only way to find data on overflow pages is to look through all cells.</p>
	<p>For example:</p>		<p>For example:</p>
	<ul>		<ul>
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	<p class="code">M204.2777: CDMAXP2X PARAMETER RESET TO LARGER CDMINP2X		<p class="code">M204.2777: CDMAXP2X PARAMETER RESET TO LARGER CDMINP2X
	</p>		</p>
	<p>Increasing the number of compacted pages ~~may~~ save CCATEMP pages, however, compacting more pages ~~may~~ consume more CPU time. Rocket Software recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.</p>		<p>Increasing the number of compacted pages might save CCATEMP pages; however, compacting more pages might consume more CPU time. Rocket Software Technical Support recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.</p>
	[[Category:System parameters]]		[[Category:System parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

DmeWiccan: Automatically generated page update

2013-08-27T16:25:23Z

Automatically generated page update

← Older revision		Revision as of 16:25, 27 August 2013
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			{{Template:CDMAXP2X parameter subtitle}}
	==Summary==		==Summary==
	<dl>		<dl>

DmeWiccan: Automatically generated page update

2013-04-23T01:50:47Z

Automatically generated page update

← Older revision		Revision as of 01:50, 23 April 2013
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	</p>		</p>
	<p>Increasing the number of compacted pages may save CCATEMP pages, however, compacting more pages may consume more CPU time. Rocket Software recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.</p>		<p>Increasing the number of compacted pages may save CCATEMP pages, however, compacting more pages may consume more CPU time. Rocket Software recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.</p>
	[[Category:System ~~Parameters~~]]		[[Category:System parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

Dme: Undo revision 56820 by DmeWiccan (talk)

2013-04-19T15:33:34Z

Undo revision 56820 by DmeWiccan (talk)

← Older revision		Revision as of 15:33, 19 April 2013
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	</p>		</p>
	<p>Increasing the number of compacted pages may save CCATEMP pages, however, compacting more pages may consume more CPU time. Rocket Software recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.</p>		<p>Increasing the number of compacted pages may save CCATEMP pages, however, compacting more pages may consume more CPU time. Rocket Software recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.</p>
	[[Category:System ~~parameters~~]]		[[Category:System Parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

DmeWiccan: Automatically generated page update

2013-04-19T14:38:23Z

Automatically generated page update

← Older revision		Revision as of 14:38, 19 April 2013
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	</p>		</p>
	<p>Increasing the number of compacted pages may save CCATEMP pages, however, compacting more pages may consume more CPU time. Rocket Software recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.</p>		<p>Increasing the number of compacted pages may save CCATEMP pages, however, compacting more pages may consume more CPU time. Rocket Software recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.</p>
	[[Category:System ~~Parameters~~]]		[[Category:System parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

Alex: Automatically generated page update

2013-02-28T00:55:19Z

Automatically generated page update

New page

==Summary==
<dl>
<dt>Default value
<dd>8
<dt>Parameter type
<dd>System
<dt>Where set
<dd>On User 0's parameter line
<dt>Related products
<dd>All
<dt>Introduced
<dd><var class="product">Model 204 V6.1</var> or earlier
</dl>
==Description==
The CDMAXP2X parameter indicates the maximum number-in powers of 2-of 6K pages allocated in virtual storage that will be used for the TBO constraints log, and in CCATEMP, if CDMAXP2X is greater than CDMINP2X. These pages are permanently allocated during initialization. Pages are compacted till their number exceeds CDMAXP2X. 
When a constraints page becomes almost full it is split into two pages. When the number of pages exceeds 2**CDMAXP2X, the splitting process stops and records grow into overflow pages that never split, but may be merged when they become too empty. Overflow pages are not compacted, because they do not have basic records and thus do not participated in hashing. The only way to find data on overflow pages is to look through all cells.
For example:
<ul>
<li>
CDMAXP2X=0 sets the maximum number of pages to compact to one.</li>
<li>
CDMAXP2X=8 sets the maximum number of pages to compact to 256. </li>
</ul>
The minimum value is zero and maximum value is 16, which corresponds to 64K pages. The parameter is not resettable. 
However, during initialization, if the value of CDMAXP2X is less than the value of CDMINP2X, then CDMAXP2X is automatically reset to the larger value of CDMINP2X. The following message is also issued: 
M204.2777: CDMAXP2X PARAMETER RESET TO LARGER CDMINP2X

Increasing the number of compacted pages may save CCATEMP pages, however, compacting more pages may consume more CPU time. Rocket Software recommends setting the value of CDMAXP2X between 7 and 9 and testing your results.
[[Category:System Parameters]]
[[Category:Parameters]]