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Address review comments
Co-authored-by: Mats Rydberg <mats@neotechnology.com>
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doc/modules/ROOT/pages/installation/System-requirements.adoc

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[[System-requirements]]
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= System Requirements
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:neo4j-docs-link-version: 4.4
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== Main Memory
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The GDS library runs within a Neo4j instance and is therefore subject to the general https://neo4j.com/docs/operations-manual/{neo4j-docs-link-version}/performance/memory-configuration/[Neo4j memory configuration].
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The GDS library runs within a Neo4j instance and is therefore subject to the general https://neo4j.com/docs/operations-manual/4.4/performance/memory-configuration/[Neo4j memory configuration].
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.GDS heap memory usage
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image::memory-usage.png[width=600]
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[[heap-size]]
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=== Heap size
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The heap space is used for storing graph projections in the graph catalog and algorithm state.
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The heap space is used for storing graph projections in the graph catalog, and algorithm state.
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[.tabbed-example, caption = ]
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====
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When writing algorithm results back to Neo4j, heap space is also used for handling transaction state (see https://neo4j.com/docs/operations-manual/{neo4j-docs-link-version}/reference/configuration-settings/#config_dbms.tx_state.memory_allocation[dbms.tx_state.memory_allocation]).
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When writing algorithm results back to Neo4j, heap space is also used for handling transaction state (see https://neo4j.com/docs/operations-manual/4.4/reference/configuration-settings/#config_dbms.tx_state.memory_allocation[dbms.tx_state.memory_allocation]).
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For purely analytical workloads, a general recommendation is to set the heap space to about 90% of the available main memory.
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This can be done via https://neo4j.com/docs/operations-manual/{neo4j-docs-link-version}/reference/configuration-settings/#config_dbms.memory.heap.initial_size[dbms.memory.heap.initial_size] and https://neo4j.com/docs/operations-manual/{neo4j-docs-link-version}/reference/configuration-settings/#config_dbms.memory.heap.max_size[dbms.memory.heap.max_size].
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This can be done via https://neo4j.com/docs/operations-manual/4.4/reference/configuration-settings/#config_dbms.memory.heap.initial_size[dbms.memory.heap.initial_size] and https://neo4j.com/docs/operations-manual/4.4/reference/configuration-settings/#config_dbms.memory.heap.max_size[dbms.memory.heap.max_size].
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To configure the PageCache size you can use the following Neo4j configuration property
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https://neo4j.com/docs/operations-manual/{neo4j-docs-link-version}/reference/configuration-settings/#config_dbms.memory.pagecache.size[dbms.memory.pagecache.size]
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https://neo4j.com/docs/operations-manual/4.4/reference/configuration-settings/#config_dbms.memory.pagecache.size[dbms.memory.pagecache.size]
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[NOTE]
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Decreasing the page cache size in favor of heap size is *not* recommended if the Neo4j instance runs both, operational and analytical workloads at the same time.
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See https://neo4j.com/docs/operations-manual/{neo4j-docs-link-version}/performance/memory-configuration/[Neo4j memory configuration] for general information about page cache sizing.
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See https://neo4j.com/docs/operations-manual/4.4/performance/memory-configuration/[Neo4j memory configuration] for general information about page cache sizing.
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[[system-requirements-cpu]]

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