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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-85877] Use restartable sequences to implement a 64-bit counter</title>
                <link>https://jira.mongodb.org/browse/SERVER-85877</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The counter (i.e. &lt;tt&gt;Counter&lt;/tt&gt;) will point to a contiguous region of memory containing all of its partitions. It will use rseq to implement increment operations:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The start (restart) code will use the following to index the array of counters and compute the address for the partition that needs to be updated:
	&lt;ul&gt;
		&lt;li&gt;The identifier of the logical core running the update. This is used to index a lookup table that comes before the counter storage. The following figure is an illustration of the memory layout for an object with 7 counters (yellow boxes) running on a 4 core system.&lt;/li&gt;
		&lt;li&gt;The (zero-based) offset assigned to the counter.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;The commit code will perform the requested update (increment or decrement) on the address computed in the previous stage.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It also provides a read API that returns the aggregate of all partitions for the counter. This will be the building block to implement &lt;tt&gt;CounterHolder&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2560146">SERVER-85877</key>
            <summary>Use restartable sequences to implement a 64-bit counter</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
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                <created>Mon, 29 Jan 2024 18:32:13 +0000</created>
                <updated>Tue, 30 Jan 2024 01:01:45 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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