Abstract: A method for storage includes storing multiple memory pages in a memory of a first compute node. Using a second compute node that communicates with the first compute node over a communication network, duplicate memory pages are identified among the memory pages stored in the memory of the first compute node by directly accessing the memory of the first compute node. One or more of the identified duplicate memory pages are evicted from the first compute node. The identification of duplicate pages is performed by a node selected responsive to available processing or bandwidth resources.

Abstract: A computing method includes running, on a plurality of compute nodes, multiple workloads that access respective sets of memory pages. Respective bitmaps are calculated for at least some of the workloads, wherein (i) a bitmap of a workload is statistically indicative of a cardinality of the set of memory pages used by the workload, (ii) a union of two or more bitmaps is statistically indicative of the cardinality of a union of the sets of memory pages used by the two or more corresponding workloads, and (iii) an intersection of first and second bitmaps is statistically indicative of an overlap between respective first and second sets of memory pages used by the corresponding workloads. A decision is made to migrate a selected workload from a source compute node to a destination compute node, based on one or more of the bitmaps.

Abstract: A method includes, in a computing system that includes one or more compute nodes that run clients, defining memory chunks, each memory chunk including multiple memory pages accessed by a respective client. Respective similarity-preserving signatures are computed for one or more of the memory chunks. Based on the similarity-preserving signatures, an identification is made that first and second memory chunks differ in content in no more than a predefined number of memory pages with at least a predefined likelihood. Efficiency of access to the identified first and second memory chunks is improved.

Abstract: A method for storage includes storing multiple memory pages in a memory of a first compute node. Using a second compute node that communicates with the first compute node over a communication network, duplicate memory pages are identified among the memory pages stored in the memory of the first compute node by directly accessing the memory of the first compute node. One or more of the identified duplicate memory pages are evicted from the first compute node. The identification of duplicate pages is performed by a node selected responsive to available processing or bandwidth resources.

Abstract: A method includes monitoring performance of a plurality of workloads that run on multiple compute nodes. Respective time series of anomalous performance events are established for at least some of the workloads. A selected workload is placed on a selected compute node, so as to reduce cross-interference between two or more of the workloads, by comparing two or more of the time series.

Abstract: A computing method includes running, on a plurality of compute nodes, multiple workloads that access respective sets of memory pages. Respective bitmaps are calculated for at least some of the workloads, wherein (i) a bitmap of a workload is statistically indicative of a cardinality of the set of memory pages used by the workload, (ii) a union of two or more bitmaps is statistically indicative of the cardinality of a union of the sets of memory pages used by the two or more corresponding workloads, and (iii) an intersection of first and second bitmaps is statistically indicative of an overlap between respective first and second sets of memory pages used by the corresponding workloads. A decision is made to migrate a selected workload from a source compute node to a destination compute node, based on one or more of the bitmaps.

Abstract: A method includes running a Virtual Machine (VM) on a first compute node in a plurality of compute nodes that communicate with one another over a communication network. The VM is migrated from the first compute node to a second compute node in the plurality by generating, for memory pages accessed by the VM, page transfer state of one or more local memory pages that are accessed locally on the first compute node, and of one or more externalized memory pages whose access is not confined to the first node. Based on the page transfer state, the migrated VM is provided with access to the memory pages, including both the local and the externalized memory pages, on the second compute node.

Abstract: A method includes running a Virtual Machine (VM) on a first compute node in a plurality of compute nodes that communicate with one another over a communication network. The VM is migrated from the first compute node to a second compute node in the plurality by generating, for memory pages accessed by the VM, page transfer state of one or more local memory pages that are accessed locally on the first compute node, and of one or more externalized memory pages whose access is not confined to the first node. Based on the page transfer state, the migrated VM is provided with access to the memory pages, including both the local and the externalized memory pages, on the second compute node.

Abstract: A method includes, in a computing system that includes one or more compute nodes that run clients, defining memory chunks, each memory chunk including multiple memory pages accessed by a respective client. Respective similarity-preserving signatures are computed for one or more of the memory chunks. Based on the similarity-preserving signatures, an identification is made that first and second memory chunks differ in content in no more than a predefined number of memory pages with at least a predefined likelihood. Efficiency of access to the identified first and second memory chunks is improved.

Abstract: A method for storage includes storing multiple memory pages in a memory of a first compute node. Using a second compute node that communicates with the first compute node over a communication network, duplicate memory pages are identified among the memory pages stored in the memory of the first compute node by directly accessing the memory of the first compute node. One or more of the identified duplicate memory pages are evicted from the first compute node.