IOAGoGo is a library for doing basic IO benchmarking using various different methodologies available in core Java. It's extensible and should be usable anywhere that Java is.
IOAGoGo includes a basic command line interface for benchmarking the included strategies.
Build it with:
./gradlew commandJar
Run it with
java -jar build/libs/ioagogo.jar
The following runs are of a 256MB file.
Mac OSX 10.10.1, Mac Mini Server (Mid 2011), on a spinning, SATA disk, with Oracle Java 1.8.0_25-b17, 64-Bit server VM:
This run suggests that using a direct-allocated ByteBuffer with FileChannel reads of at least 32KB, but no more than 2MB is your best bet on this system.
This run was conducted on the built-in storage of a US Samsung Galaxy S4. It omits the "FileChannel with MappedByteBuffer" strategy as this one ran out of memory quickly, failing with ENOMEM in a JNI call. The other strategies failed to allocate 64MB and larger buffers, so those are also omitted. This run suggests that all strategies are effectively equivalent, so long as you use an 8KB buffer. There seem to be slight benefits (~5%) in using a 4MB buffer. These runs showed fairly high variability, so YMMV.
Thanks to David Robert Nadeau, Ph.D., whose fine article, Java tip: How to read files quickly, inspired this library.
Copyright (c) 2014-2015 Emil Ong
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