Frequently Asked Questions
Here you can find examples of how to use TornadoVM with GraalVM Polyglot.
No, TornadoVM is not a DSL. It compiles a subset of Java code to OpenCL and PTX.
The TornadoVM API only provides two Java annotations (@Parallel and @Reduce) plus a light API to create task-schedules (groups of Java methods to be accelerated by TornadoVM).
Is TornadoVM a DSL?
Which programming languages does TornadoVM support?
Does TornadoVM support calls to standard Java libraries?
Partially yes. TornadoVM currently supports calls to the Math library. However, invocations that imply I/O are not supported.
Still have questions? Get in touch and we’ll be happy to help.
What can TornadoVM do?
TornadoVM accelerates parts of your Java applications on heterogeneous hardware devices such as multicore CPUs, GPUs, and FPGAs. TornadoVM is currently being used to accelerate machine learning and deep learning applications, computer vision, physics simulations, financial applications, computational photography, natural language processing and signal processing.
How can I use it?
List of compatible JDKs
TornadoVM can currently execute with the following three configurations:
TornadoVM with JDK 8 with JVMCI support.
TornadoVM with GraalVM (either with JDK 8, JDK 11, JDK 16).
TornadoVM with JDK11+ (e.g. OpenJDK, Red Hat Mandrel, Amazon Corretto, Windows JDK 11, JDK 16).
There are several examples available showing how to use TornadoVM API and how to run with TornadoVM.
Does it support the whole Java Language?
No, TornadoVM supports a subset of the Java programming language. A list of unsupported features along with the reasoning behind it can be found here.
Can TornadoVM degrade the performance of my application?
No, TornadoVM can only increase the performance of your application because it can dynamically change the execution of a program at runtime onto another device. If a particular code segment cannot be accelerated, then execution falls back to the host JVM which will execute your code on the CPU as it would normally do.
Also with the Dynamic Reconfiguration, TornadoVM discovers the fastest possible device for a particular code segment completely transparently to the user.
How does TornadoVM interact with OpenJDK?
TornadoVM makes use of the Java Virtual Machine Common Interface (JVMCI) that is included from Java 9 to compile Java bytecode to OpenCL C / PTX at runtime. As a JVMCI implementation, TornadoVM uses Graal (it extends the Graal IR and includes new backends for OpenCL C and PTX code generation).
How do I know which parts of my application are suitable for acceleration?
Workloads with for-loops that do not have dependencies between iterations are very good candidates to offload on accelerators. Examples of this pattern are NBody computation, Black-scholes, DFT, KMeans, etc.
Besides, matrix-type applications are good candidates, such as matrix-multiplication widely used in machine and deep learning.
Does TornadoVM support only OpenCL devices?
No. Currently, TornadoVM supports two compiler backends and therefore, it is able to generate OpenCL and PTX code depending on the hardware configuration.
Why is it called a VM?
The VM name is used because TornadoVM implements its own set of bytecodes for handling heterogeneous execution. These bytecodes are used for handling JIT compilation, device exploration, data management and live task-migration for heterogeneous devices (multi-core CPUs, GPUs, and FPGAs). We sometimes refer to a VM inside a VM (nested VM). The main VM is the Java Virtual Machine, and TornadoVM sits on top of that.
More information are available here.
How can I contribute to TornadoVM?
TornadoVM is an open-source project, and, as such, we welcome contributions.
TornadoVM is an open-source project, and, as such, we welcome contributions from all levels.
Solve issues reported on the GitHub page.
New proposals: We welcome new proposals and ideas. To work on a new proposal, use the discussion page on GitHub. Alternatively, you can open a shared document (e.g., a shared Google doc) where we can discuss and analyse your proposal.
Here you can find more information about how to contribute, code conventions, and tasks.