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| <a href="/docs/2.9.1/services/services" class='' >Using Ignite Services</a> |
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| <a href="/docs/2.9.1/messaging" class='' >Using Ignite Messaging</a> |
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| <div class="left-nav__overlay"></div> |
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| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/memory-architecture.adoc" target="_blank">Edit</a> |
| |
| <h1>Memory Architecture</h1> |
| |
| <div class="sect1"> |
| <h2 id="overview">Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite memory architecture allows storing and processing data and indexes both in memory and on disk, and helps achieve in-memory performance with the durability of disk.</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <img src="/docs/2.9.1/images/durable-memory-overview.png" alt="Memory architecture"> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The multi-tiered storage operates in a way similar to the virtual memory of operating systems, such as Linux. |
| However, one significant difference between these two types of architecture is that the multi-tiered storage always treats the disk as the superset of the data (if persistence is enabled), capable of surviving crashes and restarts, while the traditional virtual memory uses the disk only as a swap extension, which gets erased once the process stops.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="memory-architecture">Memory Architecture</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Multi-tiered architecture is a page-based memory architecture that is split into pages of fixed size. The pages are stored in <em>managed off-heap regions</em> in RAM (outside of Java heap) and are organized in a special hierarchy on disk.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ignite maintains the same binary data representation both in memory and on disk. This removes the need for costly serialization when moving data between memory and disk.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The picture below illustrates the architecture of the multi-tiered storage.</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <img src="/docs/2.9.1/images/durable-memory-diagram.png" alt="durable memory diagram" height="700px"> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="memory-segments">Memory Segments</h3> |
| <div class="paragraph"> |
| <p>Every data region starts with an initial size and has a maximum size it can grow to. The region expands to its maximum size by allocating continuous memory segments.</p> |
| </div> |
| <div class="paragraph"> |
| <p>A memory segment is a continuous byte array or physical memory allocated from the operating system. The array is divided into pages of fixed size. There are several types of pages that can reside in the segment, as shown in the picture below.</p> |
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