Programming with J-NVM Sample Clauses

Programming with J-NVM. ‌ Overview J-NVM decomposes a persistent object into a persistent data structure and a volatile proxy. Persistent data structures live in NVMM, outside the Java heap. Proxies are regular Java ob- jects that intermediate access to the persistent data structures. They implement the PObject interface, are instantiated on-demand (e.g., when a persistent object is dereferenced) and managed by the Java runtime. The above decoupling principle avoids running a garbage collector on persistent objects. Based on it, J-NVM implements a complete developer-friendly interface that offers failure-atomic blocks. To construct this interface, J-NVM reuses ideas and principles proposed in prior works, but assembles them differently. Our framework uses a class-centric programming model, that is the prop- erty of durability is attached to a class, and not to an instance. As common with prior frameworks (e.g., Xxxx [95]), a persistent object is live by reachability from a set of user-defined persistent roots. J-NVM garbage collects the unreachable persistent objects at recovery, but avoids running a GC at runtime for performance. Instead, objects are explicitly freed by the developer. Example usage As illustrated in Figure 18, programming with J-NVM is straighforward. Any class annotated with @Persistent is durable. For instance, this is the case of Simple in Figure 18 (line 1). To run the application, the developer compiles the sources as usual, then passes a code generator over the bytecode files (the .class files). Any class marked with @Persistent is transformed.13 The code generator replaces the volatile fields with persistent ones (lines 3 and 4 in Figure 18). Accordingly, accesses to such fields are replaced by persistent accesses (lines 8, 9, 12, 27 and 28). If a field is marked transient (line 5), the code generator keeps it in volatile memory, making no transformation. The developer may use transient fields to optimize the application, e.g., to deduce a volatile value from the persistent state. In addition to the above transformations, the code generator also wraps methods into failure-atomic blocks. The fa="non-private" argument of @Persistent at line 1 specifies that each non private method has to be wrapped. In the Main class of Figure 18, the application manipu- lates a Simple object. It starts by creating (or retrieving) a persistent memory region of 1 MB called "/mnt/pmem/simple" (line 17). A persistent memory region contains by default the persistent map JNVM.ro...
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