Abstract: Methods and systems for agile load balancing include detecting an increased load for a first primary virtual machine (VM) on a first node that has a plurality of additional primary VMs running on a processor; deactivating one or more of the additional primary VMs, reducing said one or more deactivated VMs to a secondary state, to free resources at the first node for the first primary VM; and activating secondary VMs, located at one or more additional nodes, that correspond to the one or more deactivated VMs, raising said secondary VMs to a primary state. Activation and deactivation through micro-checkpointing may involve nodes of different CPU architectures during transient periods of peak load.

Abstract: The disclosed computer-implemented method for performing data replication in distributed cluster environments may include (1) identifying a distributed cluster environment that includes (A) a plurality of compute nodes that execute a plurality of virtual machines and (B) a data node that stores data that has been replicated from storage devices used by the virtual machines, (2) determining, at the data node, storage-utilization totals for the virtual machines that represent amounts of storage space on the storage devices used by the virtual machines, (3) identifying, based at least in part on the storage-utilization totals, a virtual machine whose storage-utilization total is highest among the plurality of virtual machines, (4) prioritizing the virtual machine and then in response to the prioritization, (5) directing the compute node to initiate a data replication process with the data node in connection with the virtual machine. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: A computer-implemented method for scalable network monitoring in virtual data centers may include (1) identifying a plurality of network monitoring agents executing on a plurality of virtual machine host systems within a virtual data center, (2) intercepting, at a receiving virtual machine host system, a traffic flow within a virtual network within the virtual data center, (3) determining a processor load on each of the plurality of virtual machine host systems, (4) selecting, based on the processor load on the receiving virtual machine host system exceeding an established threshold, an alternate virtual machine host system that executes a second network monitoring agent for inspecting the traffic flow, and (5) limiting the processor load on the receiving virtual machine host system by designating the second network monitoring agent executing on the alternate virtual machine host system to inspect the traffic flow. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: An approach is disclosed that receives power related data from one or more power systems. The approach then determines, based on an analysis of the power related data, an anticipated power outage, with the power outage includes a power outage time estimate. The approach further identifies jobs to be migrated from a primary data center to a remote data center. The identification of the jobs to be migrated is based, at least in part, on the power outage time estimate.

Abstract: A system receives a request to deploy a virtual machine on a node from a plurality of nodes running a plurality of virtual machines in a cloud computing system. The system selects one of the plurality of nodes having a hard disk drive (HDD) input output operations per second (IOPS) value less than an observed HDD IOPS value for the plurality of nodes running the plurality of virtual machines. The system receives a predicted HDD IOPS value for the virtual machine and determines a new HDD IOPS value for the selected node based on the HDD IOPS value for the selected node and the predicted HDD IOPS value for the virtual machine. The system instantiates the virtual machine on the selected node when the new HDD IOPS value for the selected node is less than or equal to the observed HDD IOPS value for the plurality of nodes.

Abstract: In a virtualized computer system operable in more than two hierarchical privilege levels, components of a hypervisor, which include a virtual machine kernel and virtual machine monitors (VMMs), are assigned to different privilege levels. The virtual machine kernel operates at a low privilege level to be able to exploit certain features provided by the low privilege level, and the VMMs operate at a high privilege level to support execution of virtual machines. Upon determining that a context switch from the virtual machine kernel to a VMM is to be performed, the computer system exits the low privilege level, and enters the high privilege level to execute a trampoline that supports context switches to VMMs, such as state changes, and then the VMM. The trampoline is deactivated after execution control is switched to the VMM.

Abstract: A system and method for providing dynamic I/O virtualization is herein disclosed. According to one embodiment, a device capable of performing hypervisor-agnostic and device-agnostic I/O virtualization includes a host computer interface, memory, I/O devices (GPU, disk, NIC), and efficient communication mechanisms for virtual machines to communicate their intention to perform I/O operations on the device. According to one embodiment, the communication mechanism may use shared memory. According to some embodiments, the device may be implemented purely in hardware, in software, or using a combination of hardware and software. According to some embodiments, the device may share its memory with guest processes to perform optimizations including but not limited to a shared page cache and a shared heap.

Abstract: Techniques for migrating workloads across host computing systems in a virtual computing environment are described. In one embodiment, workloads executing on different host computing systems that access identical contents that are stored on storage devices are identified, with the identical contents often being cached in a cache of each of the different host computing systems. Further, migration of one or more of the identified workloads is recommended to consolidate the identified workloads on a single host computing system, thereby allowing the identical contents to be cached within the single host computing system and allowing the identified workloads to access the cached identical contents from the single host computing system after migration in accordance with the recommendation.

Abstract: Embodiments of the present invention include systems and methods for providing data flow information of a communication end node. The communication end node includes: at least one container including one or more applications; an operating-system-container engine for hosting the container; a host operating system (OS) for hosting the operating-system-container engine; and a socket query engine that is hosted by the operating-system-container engine. The socket query engine causes steps to be performed comprising: monitoring one or more open sockets that allow the one or more applications to communicate data through a network; compiling a list of the one or more open sockets; generating information of data flow that passes through the one or more open sockets using a set of socket parameters of the one or more open sockets; and sending the information of data flow to a controller through the network.

Abstract: Approaches for monitoring performance in a networked environment are provided. An approach includes monitoring, using a first metric, performance of a first host running a virtual machine. The approach also includes determining, using a computer device, a second metric based on the virtual machine being migrated from the first host to a second host, wherein the second metric is a function of: (i) the first metric and (ii) a comparison of the first host and the second host. The approach further includes monitoring, using the second metric, performance of the second host running the virtual machine.

Abstract: An information processing system includes a first server, a second server and an information processing apparatus, the information processing apparatus including a processor configured to manage a process of causing OS running on the first server to run on the second server, and the first server including a driver configured acquire an address of the physical memory area allocated for running Booting OS to boot the OS and a controller configured to notify the processor of the address of the physical memory area, wherein the processor causes the Booting OS to run at the address of the physical memory area of the first server or the second server, and causes the OS to run on the second server by transferring the OS to the second server from the first server.

Abstract: A method and device for pulling a virtual machine mirror file includes: obtaining a mirror pulling instruction comprising a timestamp of a mirror file; determining whether the mirror pulling instruction instructs only a base mirror file; if yes, obtaining locally the base mirror file previously dispatched to physical machines; and if not, obtaining locally the base mirror file previously dispatched to physical machines, and obtaining an incremental file matching the timestamp of the mirror file. The amount of data of the virtual machine mirror file to be pulled by the virtual machine mirror management module is reduced by using the base mirror file previously dispatched to physical machines, such that the pulling period is shortened, and the loads of a server where the virtual machine mirror management module is located and the loads of the mirror server are decreased. Accordingly, the creation of the virtual machine may be accelerated.

Abstract: A system for determining a quota comprises an input interface, a candidate quota determiner, one or more quota modification determiners, and an output interface. The input interface is for receiving a quota request for an activity and receiving an estimation or an actual measurement of one or more operating parameters. A candidate quota determiner is for determining a candidate quota amount based at least in part on candidate quota parameters. The one or more quota modification determiners are for determining one or more quota modifications based on the estimation or the actual measurement of the one or more operating parameters. The output interface for providing a final quota amount based at least in part on the candidate quota amount and the one or more quota modifications.

Abstract: A method, system and computer program product for providing a guest with access to a virtual storage on a physical storage using a peripheral component interface hub. In one embodiment, the method comprises the guest sending to the peripheral component interface hub a request to access the physical storage, the request including physical addresses of the physical storage, and the peripheral component interface hub sending specified information about the request to a hypervisor. This method further comprises the hypervisor determining whether to grant or to reject the request; and when the hypervisor grants the request, the hypervisor sending a configuration command to the peripheral component interface hub. This command includes a mapping of addresses from the physical storage to addresses from the virtual storage. In an embodiment, the peripheral component interface hub uses this mapping to replace the addresses in the request with translated virtual addresses.

Abstract: In accordance with embodiments of the present disclosure, a method may include receiving an input/output command from an application executing on a virtual machine of a hypervisor, wherein the hypervisor executes on a processor subsystem, determining if the input/output command meets a predefined criteria for trapping the input/output command, and responsive to determining that the input/output command meets a predefined criteria for trapping the input/output command, bypassing a storage stack of the hypervisor by passing the input/output command to an endpoint of an accelerator device assigned for access to the hypervisor.

Abstract: Method and system for detecting and tracking multiple moving targets based on wide-area motion imagery are provided. The method includes receiving a task request from a client; sending the task request to a local agent; acquiring to-be-processed images from the client, in response to the task request; calling an Hadoop API and checking a running status of a Hadoop system for an available resource in the Hadoop system; when a resource in the Hadoop system is available, pushing the to-be processed images to a back-end Hadoop distributed file system (HDFS); running tracking algorithms of multiple moving objects associated with the to-be-processed images to provide tracking results of the multiple moving objects; when the Hadoop system is completed in running the tracking algorithms, generating and sending a message to the local agent; and sending the tracking results of the multiple moving objects from the HDFS to the front-end database.

Abstract: Embodiments of apparatuses, methods, and systems for input/output translation lookaside buffer (IOTLB) prefetching are described. In an embodiment, an apparatus includes a bridge, an input/output memory management unit (IOMMU), and an IOTLB prefetch unit. The bridge is between an input/output (I/O) side of a system and a memory side of the system. The I/O side is to include an interconnect on which a zero-length transaction is to be initiated by an I/O device. The zero-length transaction is to include an I/O-side memory address. The IOMMU includes address translation hardware and an IOTLB. The address translation hardware is to generate a translation of the I/O-side memory address to a memory-side memory address. The translation is to be stored in the IOTLB. The IOTLB prefetch control unit includes prefetch control logic to cause the apparatus to, in response to determining that the memory-side address is inaccessible, emulate completion of the zero-length transaction.

Abstract: A new approach is proposed that contemplates systems and methods to support a mechanism to offload IPSec/IKE processing of virtual machines (VMs) running on a host to an embedded networking device, which serves as a hardware accelerator for the VMs that need to have secured communication with a remote device/server over a network. By utilizing a plurality of its software and hardware features, the embedded networking device is configured to perform all offloaded IPSec operations on data packets transferred between the host and the remote device over the network as required for the secured communication before the data packets can be transmitted over the network. The embedded networking device, in effect, acts as a proxy on behalf of the VMs running on the host to perform the offloaded IPSec operations as well as serving as the network interface for the secured communication between the VMs and the remote device.

Abstract: A virtual machine control device includes a processor configured to acquire usage information including an actual usage value of respective virtual machines operating on each of information processing apparatuses during each of past periods, and create, for each of the information processing apparatuses, prediction information including a prediction usage value of the respective virtual machines during each of periods. The processor is configured to determine, upon detecting a first virtual machine whose actual usage value is not included in the usage information, whether a first period exists, in which a sum of the actual usage value of the first virtual machine and prediction usage values of virtual machines operating on a first apparatus exceeds a criterion. The processor is configured to issue, upon determining that the first period exists, an instruction to move one of virtual machines operating on the first apparatus to a second apparatus before the first period.

Abstract: Systems, methods, and computer program products to perform an operation comprising receiving a first data frame and a second data frame by a device driver of a first virtual network interface controller (vNIC) of a plurality of vNICs sharing a physical network interface controller (NIC) of a computing system, storing, by the device driver of the first vNIC, the first and second data frames in a first queue for the first vNIC, generating, by the device driver of the first vNIC, an optimized data frame comprising the first and second data frames, wherein the optimized data frame specifies a modified Ethernet preamble, and sending the optimized data frame to a hypervisor of the computing system.

Abstract: Disclosed herein are techniques for performing workflow-aware NUMA (non-uniform memory access) optimizations. “Execution contexts” such as virtual machines or Docker containers are managed within a computer system that includes multiple NUMA nodes, each including a processor socket and memory local to that socket. NUMA optimization techniques are performed whereby execution contexts and/or data for such contexts are migrated between NUMA nodes. Migration may occur for various reasons, including for load balancing, to achieve fairness, or to increase the amount of data that is stored in memory local to a particular execution context. When it is known that an execution context will soon stop executing in a particular computer system, optimizations may provide little or no benefit. In such situations, the computer system performs modified NUMA optimizations, in which certain optimizations that would normally be performed are instead not performed.

Abstract: Methods, systems, and computer program products are included for providing I/O state protections to a virtualized environment. An example method includes configuring, by a hypervisor, a processor to execute instructions corresponding to a guest of a virtual machine (VM). As part of a transition of operations from the VM to the hypervisor, the guest specifies a first register of the processor. The processor then provides the hypervisor with access to non-encrypted data stored in first register, while data stored in non-specified registers is maintained in the processor in an encrypted format. The hypervisor receives the non-encrypted data from the first register.

Abstract: A method and a system are provided to manage analytics assets associated with at least one computer accessible to an organization using operating system (OS) containers. The method comprising receiving a request to process of a task on the user computing device. The method further select a set of analytics assets from a first category, based on at least one of a role of the user in the organization and a historical usage of the one or more analytics assets or a second category that corresponds to the user and are included in the container image associated with the user. The method further update the container image of the user, based on at least the selection of the set of analytics assets from the first category. The method further render the selected set of analytics assets through the updated container image on the user computing device of the user.

Abstract: An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.

Abstract: A processing system includes a processor and a VM-to-VM communication accelerator circuit comprising a first interface device to support direct memory access (DMA) data transfers by the first VM, a register to store a reference to a primary physical function (PF) associated with the first interface device, wherein the first primary PF is associated with an access control table (ACT) specifying an access permission for the first VM with respect to a second VM, and a direct memory access (DMA) descriptor processing circuit to process, using a working queue associated with the first primary PF, a DMA descriptor referencing a request for a DMA data transfer between the first VM and the second VM, and execute, using the first interface device, the DMA data transfer based on the access permission.

Abstract: Examples of systems and methods are provided for communication and for forwarding display data related to a remote session between a client device and a remote server to a host device. The system may facilitate establishing the remote session with the remote server. The system may facilitate establishing a trusted relationship between the client device and the host device. The system may filter out data related to local graphical user interface (GUI) and selectively forward from the client device to the host device display data related to the remote session established between the client device and the remote server.

Abstract: A technique for operating a computer system to support an application, a first application server environment, and a second application server environment includes intercepting a work request relating to the application issued to the first application server environment prior to execution of the work request. A thread adapted for execution in the first application server environment is created. A context is attached to the thread that non-disruptively modifies the thread into a hybrid thread that is additionally suitable for execution in the second application server environment. The hybrid thread is returned to the first application server environment.

Abstract: A method for handling transmission control protocol (TCP) data between networked computer nodes during blackout periods associated with live kernel updating is provided. The method includes initiating a live kernel update on a first node, transmitting, prior to performing a network blocking procedure associated with the live kernel update, a zero window update to one or more peer nodes, generating a surrogate partition associated with the first node, copying network states from an original partition associated with the first node to the surrogate partition, restoring the network states on the surrogate partition, and transmitting another window update to the one or more peer nodes.

Abstract: A supplemental display device is configured to be used with a first computing device having a first display. The supplemental display device has a touchscreen display and a control system.

Abstract: A computer-implemented method for controlling a connection between a virtual machine and a physical device comprises receiving a connection request for connecting the physical device to the virtual machine and determining whether the virtual machine satisfies a first connection permission condition and whether the physical device satisfies a second connection permission condition. In response to a determination that the virtual machine does not satisfy the first connection permission condition, a configuration of the virtual machine is changed to satisfy the first connection permission condition. In response to a determination that the physical device does not satisfy the second connection permission condition, a configuration of the physical device is changed to satisfy the second connection permission condition.

Abstract: A method and a system for managing flat and routed clients in a cluster using single virtual IP (VIP) are provided herein. The method includes broadcasting an ARP request from a client to a cluster of nodes; monitoring the broadcasted ARP request at one of the nodes and ignoring the ARP request at all other nodes; in a case that the monitored ARP requests is associated with a different target VIP for same client IP, determining the client associated with the ARP request as a routed client, otherwise the client is determined as a flat client; applying at least one load balancing logic for assigning one of the nodes to the client associated with the ARP request, wherein both flat clients and routed clients are treated as independent clients counted separately; and notifying the client associated with the ARP of a MAC address of the assigned node.

Abstract: Various methods, systems, and processes for mitigating fragmentation in synthetic full backups are disclosed. One or more storage units out of multiple storage units are identified. The multiple storage units include one or more new storage units or one or more existing storage units. The multiple storage units are accessed and a determination is made as to whether the one or more storage units out of the multiple storage units meet a threshold. The threshold is a measure of a characteristic of those one or more storage units. If one or more storage units meet the threshold, those one or more storage units are included in a backup stream, and the backup stream is sent to a backup server.

Abstract: Methods and systems for managing, storing, and serving data within a virtualized environment are described. In some embodiments, a data management system may manage the extraction and storage of virtual machine snapshots, provide near instantaneous restoration of a virtual machine or one or more files located on the virtual machine, and enable secondary workloads to directly use the data management system as a primary storage target to read or modify past versions of data. The data management system may allow a virtual machine snapshot of a virtual machine stored within the system to be directly mounted to enable substantially instantaneous virtual machine recovery of the virtual machine.

Abstract: Techniques for implementing a shared data cache for kernel bypass applications are provided. In one set of embodiments, a shared data caching (SDC) service associated with an instance of a kernel bypass application can create a named shared memory region in user space, where the kernel bypass application is configured to use a user-level Input/Output (I/O) stack for accessing a physical I/O device. The SDC service can further map the named shared memory region into a virtual memory address space of the instance. Then, at a time the instance issues an I/O read request to the physical I/O device, the SDC service can process the I/O read request by accessing the named shared memory region as a data cache.

Abstract: A JAVA virtual machine with multiple tenants is shared by allocating an IP address to each of the tenants, creating a separate virtual network interface for each of the tenants and configuring each separate virtual network interface with the respective separate IP address allocated for each tenant. For each of the tenants, network operations are performed via the virtual network interface created for that tenant, to provide for network isolation of each tenant sharing a JAVA virtual machine.

Abstract: A cloud system data management method for alleviate a data leakage problem occurring when a user accessed by another user when a virtual data volume of the user is mounted to a virtual machine of another user includes creating a first virtual machine for a user and allocating a virtual data volume to the first virtual machine, setting an identifier of the virtual data volume as an identifier corresponding to a home identifier of the first virtual machine, determining, according to the identifier of the virtual data volume and a home identifier of a second virtual machine, whether the virtual data volume and the second virtual machine belong to a same user when the virtual data volume needs to be mounted to the second virtual machine, forbidding the virtual data volume to be mounted to the second virtual machine when they do not belong to the same user.

Abstract: A method and system for monitoring health of virtual environment includes receiving input data for one or more virtual machines in the virtual environment. A number of entitled CPU cycles for each of the virtual machines based on the input data are determined. A number of actual CPU cycles obtained by each of the virtual machines based on the input data are computed. The number of entitled CPU cycles is compared with the number of actual CPU cycles for each of the virtual machines. A health status of the virtual machines based on the comparison is displayed.

Abstract: Systems and processes provide network clients on various platforms a customized file system experience on demand while managing files (e.g., computer animation files) across a variety of storage devices spread across a network of arbitrary size (local area networks, wide area networks, worldwide networks, the world wide web, etc.). Clients may specify a set of requirements for an instantiation of a file system interface or object for a given application. Such requirements may include storage location, file quality, capacity, scale, permanence, speed, and the like. The system may then provide to the client a customized file system interface with particular hardware resources allocated to satisfy the designated file system requirements. The file system interface may coordinate file delivery, allocation, tracking, transportation, caching, deletion, and the like. The system may manage and allocate hardware resources ranging from a local client computer to distant hard drive banks across the world.

Abstract: A datacenter, a communication apparatus, a communication method, and a communication control method in a communication system are provided that can enhance the versatility of a datacenter and a virtual network constructed therein. A communication system includes: a plurality of wireless communication facilities owned by a plurality of network operators, respectively; and a datacenter in which a virtual core network is constructed, wherein the virtual core network implements mobile communication functions by using the plurality of wireless communication facilities.

Abstract: A virtualized environment includes a pool of VMs, each VM configured to run one or more virtual containers. Each virtual container runs as an isolated process in userspace on a guest operating system. A virtualization management module performs resource management operations to place containers within the pool of VMs according to performance metrics, and also perform high availability functionality for containers with critical containers.

Abstract: Bandwidth requirement specifications in a multi-tenant datacenter are implemented using resource-bundle level queues and tenant level queues. Data is transmitted via the resource-bundle level queues and the tenant level queues according to the bandwidth requirement specifications, such that minimum bandwidth requirements are maintained for data being transmitted and for data being received.

Abstract: An illustrative “Live Synchronization” feature in a data storage management system can reduce the downtime that arises in failover situations. The illustrative Live Sync embodiment uses backup data to create and maintain a ready (or “warm”) virtualized computing platform comprising one or more virtual machines (“VMs”) that are configured and ready to be activated and take over data processing from another data processing platform operating in the production environment. The “warm” computing platform awaits activation as a failover solution for the production system(s) and can be co-located at the production data center, or configured at a remote or disaster recovery site, which in some embodiments is configured “in the cloud.” Both local and remote illustrative embodiments are discussed herein. An “incremental forever” approach can be combined with deduplication and synthetic full backups to speed up data transfer and update the disaster recovery sites.

Abstract: A computing resources service provider may provide customers with access to virtual computing resources to execute various applications on behalf of the customer. There may be occasional impairment to the virtual computing resources. These impairments may be detected in log information obtained by an impairment detection service. Furthermore, the impairment detection service may obtain additional information associated with the virtual computing resources. The log information and additional information may be correlated to determine one or more relevant factors in the impairments.

Abstract: A computer system with a hypervisor detects the local physical connection of a portable storage device with an operating system image thereon. The computer system installs an instance of the operating system on the hypervisor, and the hypervisor assigns a set of resources to the instance to generate a virtual machine. As further portable storage devices with operating systems thereon are locally, physically connected to the computer system, additional virtual machines are generated, each with a different operating system instance, which may be the same or different from the other operating system instances. The resources of the computer system are assigned and reassigned among the virtual machines as the portable storage devices are connected and disconnected.

Abstract: Disclosed aspects relate to rearrangement management for a shared pool of configurable computing resources including a source asset, a target asset, and a memory device having a set of data. A first subset of the set of data on the memory device may be locked with respect to modification. A first set of logical address identifiers for the first subset of the set of data on the memory device may be identified in a hypervisor mapping table in a first set of source entries for the source asset. The first set of logical address identifiers for the first subset of the set of data on the memory device may be established in the hypervisor mapping table in a first set of target entries for the target asset. The first subset of the set of data on the memory device may be unlocked with respect to modification.

Abstract: In particular embodiments, a system for managing a virtualization environment includes host machines, each of the host machines including a hypervisor, user virtual machines (UVMs) and a virtual machine controller. The virtualization environment also includes virtual disks comprising a plurality of storage devices, and being accessible by the virtual machine controllers. The virtual machine controllers conduct I/O transactions with the virtual disks. The system stores an entity-relationship graph representing elements in the virtualization environment. Each of the elements is represented by an entity-type node in the entity-relationship graph, and relationships between the elements are represented by edges between the nodes.

Abstract: A system including a gasket communicatively coupled between a unified northbridge (UNB) having a cache coherent interconnect (CCI) interface and a processor having an Advanced eXtensible Interface (AXI) coherency extension (ACE). The gasket is configured to translate requests from the processor that include ACE commands into equivalent CCI commands, wherein each request from the processor maps onto a specific CCI request type. The gasket is further configured to translate ACE tags into CCI tags. The gasket is further configured to translate CCI encoded probes from a system resource interface (SRI) into equivalent ACE snoop transactions. The gasket is further configured to translate the memory map to inter-operate with a UNB/coherent HyperTransport (cHT) environment. The gasket is further configured to receive a barrier transaction that is used to provide ordering for transactions.

Abstract: Asynchronous operations associated with a request such as threads, runnable elements, callable elements, and other invokable objects are tracked to determine the metrics about the request and operations. The present technology tracks the start and end of each asynchronous operation and maintains a counter which tracks the currently pending or executing asynchronous operations. By monitoring the request, the start and end of each asynchronous operation associated with the request, and the number of asynchronous operations currently executing, the present technology may identify the end of a request by identifying when the last asynchronous operation associated with the request ends. In some instances, the present technology identifies the end of a request when a counter which tracks the number of asynchronous operations executing reaches a value of zero after the first asynchronous operation has already begun.

Abstract: Input/output (I/O) operation requests from pageable storage mode guests are interpreted without host intervention. In a pageable mode virtual environment, requests issued by pageable storage mode guests are processed by one or more processors of the environment absent intervention from one or more hosts of the environment. Processing of the requests includes manipulating, by at least one processor on behalf of the guests, buffer state information stored in host storage. The manipulating is performed via instructions initiated by the guests and processed by one or more of the processors.

Abstract: A program operating to test a computer has a limit to the number of certain components that it can utilize, less than the number of those components included in the computer. A resource allocator program receives a signal to modify allocation of resources to the programs executing in the computer. The resource allocator detects that the computer is operating in a mode for testing and selects a subset of the components not allocated to the program to swap for those presently allocated. The resource allocator can receive the signal repeatedly to complete testing the computer.