—Mobile applications are constrained by the available memory of mobile devices. We present C-RAM, a system that
uses cloud-based memory to extend the memory of mobile devices. It splits application state and its associated computation
between a mobile device and a cloud node to allow applications to consume more memory, while minimising the performance
impact. C-RAM thus enables developers to realise new applications or port legacy desktop applications with a large memory
footprint to mobile platforms without explicitly designing them to account for memory limitations. To handle network failures with
partitioned application state, C-RAM uses a new snapshot-based fault tolerance mechanism in which changes to remote memory
objects are periodically backed up to the device. After failure, or when network usage exceeds a given limit, the device rolls back
execution to continue from the last snapshot. C-RAM supports local execution with an application state that exceeds the available
device memory through a user-level virtual memory: objects are loaded on-demand from snapshots in flash memory. Our C-RAM
prototype supports Objective-C applications on the unmodified iOS platform. With C-RAM, applications can consume 10× more
memory than the device capacity, with a negligible impact on application performance. In some cases, C-RAM even achieves a
significant speed-up in execution time (up to 9.7×).