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| <div class="subTitle">org.apache.sysds.runtime.controlprogram.caching</div> |
| <h2 title="Class UnifiedMemoryManager" class="title">Class UnifiedMemoryManager</h2> |
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| <li>org.apache.sysds.runtime.controlprogram.caching.UnifiedMemoryManager</li> |
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| <pre>public class <span class="typeNameLabel">UnifiedMemoryManager</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Unified Memory Manager - Initial Design |
| |
| Motivation: |
| The Unified Memory Manager, henceforth UMM, will act as a central manager of in-memory |
| matrix (uncompressed and compressed), frame, and tensor blocks within SystemDS control |
| program. So far, operation memory (70%) and buffer pool memory (15%, LazyWriteBuffer) |
| are managed independently, which causes unnecessary evictions. New components like the |
| LineageCache also use and manage statically provisioned memory areas. Ultimately, the |
| UMM aims to eliminate these shortcomings by providing a central, potentially thread-local, |
| memory management. |
| |
| Memory Areas: |
| Initially, the UMM only handles CacheBlock objects (e.g., MatrixBlock, FrameBlock, and |
| TensorBlock), and manages two memory areas: |
| (1) operation memory (pinned cache blocks and reserved memory) and |
| (2) dirty objects (dirty cache blocks that need to be written to local FS before eviction) |
| |
| The UMM is configured with a capacity (absolute size in byte). Relative to this capacity, |
| the operations and buffer pool memory areas each will have a min and max amount of memory |
| they can occupy, meaning that the boundary for the areas can shift dynamically depending |
| on the current load. Most importantly, though, dirty objects must not be counted twice |
| when pinning such an object for an operation. The min/max constraints are not exposed but |
| configured internally. An good starting point are the following constraints (relative to |
| JVM max heap size): |
| ___________________________ |
| | operations | 0% | 70% | (pin requests always accepted) |
| | buffer pool | 15% | 85% | (eviction on demand) |
| |
| Object Lifecycle: |
| The UMM will also need to keep track of the current state of individual cache blocks, for |
| which it will have a few member variables. A queue similar to the current EvictionQueue is |
| used to add/remove entries with LRU as its eviction policy. In general, there are three |
| properties of object status to consider: |
| (1) Non-dirty/dirty: non-dirty objects have a representation on HDFS or can be recomputed |
| from lineage trace (e.g., rand/seq outputs), while dirty objects need to be preserved. |
| (2) FS Persisted: on eviction, dirty objects need to be written to local file system. |
| As long the local file representation exist, dirty objects can simply be dropped. |
| (3) Pinned/unpinned: For operations, objects are pinned into memory to guard against |
| eviction. All pin requests have to be accepted, and once a non-dirty object is released |
| (unpinned) it can be dropped without persisting it to local FS. |
| |
| Thread-safeness: |
| Initially, the UMM will be used in an instance-based manner. For global visibility and |
| use in parallel for loops, the UMM would need to provide a static, synchronized API, but |
| this constitutes a source of severe contention. In the future, we will consider a design |
| with thread-local UMMs for the individual parfor workers. |
| |
| Testing: |
| The UMM will be developed bottom up, and thus initially tested via component tests for |
| evaluating the eviction behavior for sequences of API requests.</div> |
| </li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/UnifiedMemoryManager.html#UnifiedMemoryManager-long-">UnifiedMemoryManager</a></span>(long capacity)</code> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/UnifiedMemoryManager.html#delete-java.lang.String-">delete</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key)</code> |
| <div class="block">Removes a cache block associated with the given key from all memory |
| areas, and deletes evicted representations (files in local FS).</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/UnifiedMemoryManager.html#deleteAll--">deleteAll</a></span>()</code> |
| <div class="block">Removes all cache blocks from all memory areas and deletes all evicted |
| representations (files in local FS).</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/CacheBlock.html" title="interface in org.apache.sysds.runtime.controlprogram.caching">CacheBlock</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/UnifiedMemoryManager.html#pin-java.lang.String-org.apache.sysds.runtime.controlprogram.caching.CacheBlock-boolean-">pin</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key, |
| <a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/CacheBlock.html" title="interface in org.apache.sysds.runtime.controlprogram.caching">CacheBlock</a> block, |
| boolean dirty)</code> |
| <div class="block">Pins a cache block into operation memory.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/UnifiedMemoryManager.html#pin-java.lang.String-long-boolean-">pin</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key, |
| long size, |
| boolean dirty)</code> |
| <div class="block">Pins a virtual cache block into operation memory, by making a size reservation.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/UnifiedMemoryManager.html#unpin-java.lang.String-">unpin</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key)</code> |
| <div class="block">Unpins (releases) a cache block from operation memory.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/UnifiedMemoryManager.html#unpin-java.lang.String-org.apache.sysds.runtime.controlprogram.caching.CacheBlock-">unpin</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key, |
| <a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/CacheBlock.html" title="interface in org.apache.sysds.runtime.controlprogram.caching">CacheBlock</a> block)</code> |
| <div class="block">Unpins (releases) a cache block from operation memory.</div> |
| </td> |
| </tr> |
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| <h3>Constructor Detail</h3> |
| <a name="UnifiedMemoryManager-long-"> |
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| <ul class="blockListLast"> |
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| <h4>UnifiedMemoryManager</h4> |
| <pre>public UnifiedMemoryManager(long capacity)</pre> |
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| <h4>pin</h4> |
| <pre>public <a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/CacheBlock.html" title="interface in org.apache.sysds.runtime.controlprogram.caching">CacheBlock</a> pin(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key, |
| <a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/CacheBlock.html" title="interface in org.apache.sysds.runtime.controlprogram.caching">CacheBlock</a> block, |
| boolean dirty)</pre> |
| <div class="block">Pins a cache block into operation memory.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - unique identifier and local FS filename for eviction</dd> |
| <dd><code>block</code> - cache block if not under UMM control, null otherwise</dd> |
| <dd><code>dirty</code> - indicator if block is dirty (subject to buffer pool management)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>pinned cache block, potentially restored from local FS</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="pin-java.lang.String-long-boolean-"> |
| <!-- --> |
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| <ul class="blockList"> |
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| <h4>pin</h4> |
| <pre>public void pin(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key, |
| long size, |
| boolean dirty)</pre> |
| <div class="block">Pins a virtual cache block into operation memory, by making a size reservation. |
| The provided size is an upper bound of the actual object size, and can be |
| updated on unpin (once the actual cache block is provided).</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - unique identifier and local FS filename for eviction</dd> |
| <dd><code>size</code> - memory reservation in operation area</dd> |
| <dd><code>dirty</code> - indicator if block is dirty (subject to buffer pool management)</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="unpin-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>unpin</h4> |
| <pre>public void unpin(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key)</pre> |
| <div class="block">Unpins (releases) a cache block from operation memory. Dirty objects |
| are logically moved back to the buffer pool area.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - unique identifier and local FS filename for eviction</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="unpin-java.lang.String-org.apache.sysds.runtime.controlprogram.caching.CacheBlock-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>unpin</h4> |
| <pre>public void unpin(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key, |
| <a href="../../../../../../org/apache/sysds/runtime/controlprogram/caching/CacheBlock.html" title="interface in org.apache.sysds.runtime.controlprogram.caching">CacheBlock</a> block)</pre> |
| <div class="block">Unpins (releases) a cache block from operation memory. If the size of |
| the provided cache block differs from the UMM meta data, the UMM meta |
| data is updated. Use cases include update-in-place operations and |
| size reservations via worst-case upper bound estimates.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - unique identifier and local FS filename for eviction</dd> |
| <dd><code>block</code> - cache block which may be under UMM control, if null ignored</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="delete-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>delete</h4> |
| <pre>public void delete(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> key)</pre> |
| <div class="block">Removes a cache block associated with the given key from all memory |
| areas, and deletes evicted representations (files in local FS). The |
| local file system deletes can happen asynchronously.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - unique identifier and local FS filename for eviction</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="deleteAll--"> |
| <!-- --> |
| </a> |
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| <h4>deleteAll</h4> |
| <pre>public void deleteAll()</pre> |
| <div class="block">Removes all cache blocks from all memory areas and deletes all evicted |
| representations (files in local FS). All internally thread pools must be |
| shut down in a gracefully manner (e.g., wait for pending deletes).</div> |
| </li> |
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