Spark 内存管理概述 介绍了内存管理接口MemoryManager对内存的大致划分，这篇研究其子类StaticMemoryManager，静态内存管理器，的行为，主要是各部分内存的占比。StaticMemoryManager是Spark 1.6之前唯一的内存管理器。
Spark 内存管理概述 介绍了MemoryManager的UML，StaticMemoryManager继承自MemoryManager，如下
StaticMemoryManager分别使用ExecutionMemoryPool、StorageMemoryPool管理execution、storage、unroll内存，UML如下
MemoryManager将内存划分为如下几部分，接下来研究静态内存管理中下面各部分占比
之所以称为静态内存管理，是因为storage、execution内存占比和界限是固定的。看下代码中对storage、execution、unroll内存大小的限制
storage execution unroll总结如下
storage 0.6 storage-safety 0.6 * 0.9 * (1.0-0.2) unroll 0.6 * 0.9 * 0.2 storage-reserved 0.6 * 0.1 execution 0.2 execution-safety 0.2 * 0.8 execution-reserved 0.2 * 0.2 other 0.2饼图表示如下 因为无法准确计算实际使用中的内存，因此，storage、execution都会保留一部分内存，就是上图中的storage-reserved、execution-reserved。
spark 1.6版本之后默认使用统一资源管理器，由参数spark.memory.useLegacyMode控制，如下
介绍StaticMemoryManager的结构，及其管理的内存storage、execution、unroll等占比，这里所说的管理只是数值的维护。
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