X10 2.6.0 featured X10 language extensions to enhance the support for defining embedded DSLs in X10 such as overloading of control structures and trailing closures.

Enhancements to Resilient and Elastic X10

Support for Java 11 and MacOS 10.12+

X10 2.5 includes a redesign of several Place-related standard library APIs to better support Resilient and Elastic X10. The changes were made to more naturally support execution over a dynamically varying set of Places. As a result, minor adjustments may be needed to port code from X10 2.4.3 to X10 2.5.0.

Enhancements to Resilient and Elastic X10

Improvements to the x10rt_mpi implementation, class library changes in the x10.util.resilient package, and the movement of the implementation class for the X10 Runtime from x10.lang to the new x10.xrx package.

Improved compiler support for X10DT features. The X10 Editor is now much more resilient to syntax errors: features such as outline, hyperlink, hover help, and content-assist continue to work in the face of compilation errors.

Improvements in Resilient X10 including:

• significant performance improvements to the implementations of resilient finish to eliminate resiliency overheads of local activity creation
• the addition of ULFM-MPI as a network transport for Resilient X10 applications
• enhanced standard library support for writing Resilient X10 applications and frameworks (see x10.util.resilient).

X10 2.4 contains a number of significant language and class library changes that together enhance X10's ability to effectively exploit the increased memory capacity of modern computers. Specifically,

• All of X10's array types (Rail, Array, DistArray, Region, Point, etc) now use Long (64-bit) indexing.
• The default type of an integral literal (e.g. 3) is a Long instead of an Int.
• The addition of new high-performance implementations of one dimensional and multi-dimensional arrays that are optimized for zero-based dense index spaces

Unfortunately, porting programs from older version of X10 to X10 2.4 will require some effort. However, the new capabilities and higher performance enabled by true 64-bit addressing should justify the investment of effort.

Bug fixes and performance improvements. First release with "Resilient X10" capabilities for managing Place failure.

Bug fixes and performance improvements.

X10DT supports source-level debugging of Managed X10 programs!

Significant improvements to X10/Java interoperability functionality that was first introduced in X10 2.2.2. Based on our experiences with large scale usage of X10/Java interoperability in the M3R project (see VLDB 2012 paper) we determined that a few backwards incompatible changes to the X10 standard library are desirable to improve Java interoperability. In particular,

• We have added checked exceptions to X10 and reorganized the X10 exception hierarchy to directly mirror Java's.
• We have changed the API of x10.lang.String to be a strict subset of java.lang.String.
• We have removed the restriction that all X10 classes are subclasses of x10.lang.Object and removed x10.lang.Object from the standard library.

There will be no backwards incompatible language syntax changes with X10 2.2.3 in X10 2.3.0.

Bug fixes and performance improvements. This is the last planned release of the X10 2.3 language specification.

Bug fixes and performance improvements. Initial implementation of Java interop.