Importance

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Abstract

A method of migrating of an application from a source host to a destination host, wherein the application is associated with a plurality of memory pages, the source host comprises a first instance of the application and a source memory region, and each memory page has an associated source memory block in the source memory region, the method comprising: at the destination host, reserving a destination memory region such that each memory page has an associated destination memory block in the destination memory region, a second instance of the application at the destination host; on receipt of an input to the application, processing the input in parallel at the first and second instances at respective source and destination hosts: at the source host, if the processing requires a read or a write call to a memory page, respectively reading from or writing to the associated source memory block; the destination host, if the processing requires a write call to a memory page, writing to the associated destination memory block and if the processing requires a read call to a memory page, sending the read call to the source host requesting that the source host read the memory page from the associated source memory block and provide the memory page to the destination host, and, on receipt of the memory page by the destination host, writing the memory page to the associated destination memory block.

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First Claim