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memory-mapping's Introduction

memory-mapping

Investigating Java's Memory Mapped File API

Build

Requires Java 1.8+

Designed to be built using Maven 3.x, such as mvn package

Execution

The scripts directory contains utilities for executing the Java programs.

Memory Map Files

Run 50 processes which map the specified file, /tmp/memoryMappedFile to memory. Then read random chunks of the file between 4096 and 8192 bytes every 100 ms.

./memoryMapping.sh 50 /tmp/memoryMappedFile 4096 8192 100

This script generates a script to kill the generated processes called killProcesses.sh

Generate File

Generate a file called file.txt with a size of 1500 MiB.

/generateFile.sh file.txt 1500

Load Memory

Load random bytes with length 4294967296 (4GiB) to the specified size and will read the memory every 1000 ms.

./memoryLoader.sh 4294967296 1000

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