Cache resource recovery method

The invention discloses a cache resource recovery method. According to the method, with enlargement of the cache capacity as the purpose, a new cache level between a memory and a disk is established through the memory, and through cache resource recovery operation, it is avoided that identical data occupies multiple parts of the memory. To reduce time expenditure caused by cache recovery erasure, the operation of data migration in a cache is utilized to reduce time expenditure caused by effective data copying and occupation of the cache on resources; meanwhile, multi-group operation is utilized to achieve simultaneous erasure of multiple groups so as to reduce time efficiency expenditure caused by multiple times of erasure. 本发明公开了种缓存资源的回收方法，所述方法以扩大缓存容量为目的，利用内存构建个介于内存和磁盘之间的新的缓存层次，并通过缓存资源回收操作，避免相同数据占用多份内存。本发明为了减少缓存回收擦除所带来的时间开销，利用缓存内部数据迁移操作来减少有效数据拷贝带来的时间开销以及缓存对资源的占用，同时利用多分组操作来实现多个分组的同时擦除，以减少多次擦除的时间效率开销。