Abstract: A method, computer program product and apparatus are disclosed for generating response time data for a client accessing information from a network. In one of the embodiments first instructions are attached to a first block of information. The block of information is available for requesting by the client from the network. The first instructions are for causing the client to read a first reference time, responsive to the client initiating access to a second block of information from the network. Second instructions are attached to the second block of information. The second instructions are for causing the client to read a second reference time responsive to the client loading the second block of information, and for causing the client to retrieve the first reference time and compute a time difference between the first and second reference times.

Abstract: A system and method in which the server device processes the lower level layers, referred to herein as the “network portion”, of a frame substantially in parallel with the processing of the application portion of the frame. The application portion of the frame, which may include an HTTP request is forwarded to the server application such as a web server, while the network portion of the frame is processed. If the processing of the network portion determines that the frame was mis-delivered or is corrupted, the response to the HTTP request is aborted, otherwise the response is processed and returned to the client. By optimistically assuming that the request was delivered correctly, the present invention leverages the parallel processing capabilities available on many server appliances and improve response time without incurring any substantial performance penalty.

Abstract: A data processing server and method in which the server device stores a first fragment of a requested file in a first tier of storage while retaining subsequent fragments of the file in a lower tier of storage. The first tier is typically the server's volatile system memory while the second tier may represent a local disk, a networked storage device, or a remote system memory. When the server receives a client request for a file, the server transmits a first fragment of the file stored in the file cache to the client. Simultaneously, the server retrieves a subsequent fragment of the file from a lower tier of storage. By the time the first fragment is transmitted and acknowledged, the subsequent fragment is ready for transmission. In this manner, the server is able to maintain responsiveness while minimizing the amount of data cached in valuable system memory.

Abstract: A web server that integrates portions of operating system code to execute substantially within user space to reduce context switching. The web server includes an application level interpreter, such as an HTTP interpreter, configured to process client requests. The web server typically includes a network interface dedicated to process traffic to and from the web server. The web server may include within its user space kernel device driver extensions enabling it to communicate directly with the network interface. The server may implement a polling architecture in which the server periodically monitors the interface for new requests. The web server typically includes a user space transmission protocol library that enables the server to perform its own network processing of requests and responses. The library may include TCP/IP drivers that are optimized or streamlined for to processing HTTP requests.

Abstract: An apparatus for providing remote access redirect in a host channel adapter of a system area network are provided. The apparatus provides a mechanism by which a host channel adapter, in response to receiving a marker message, places selected channel(s) of the host channel adapter in a remote access redirect (RAR) mode of operation. During the RAR mode of operation, memory access messages received by the host channel adapter that are destined for portions of an application memory space marked as being protected are converted to RAR receive messages and redirected to a queue pair associated with an operating system rather than the queue pair for the application. The operating system is responsible for serializing access to application memory pages outside of the host channel adapter. The mechanisms of the present invention may be used to perform a checkpoint data integrity operation.

Abstract: A method for providing remote access redirect in a host channel adapter of a system area network are provided. The method provides a mechanism by which a host channel adapter, in response to receiving a marker message, places selected channel(s) of the host channel adapter in a remote access redirect (RAR) mode of operation. During the RAR mode of operation, memory access messages received by the host channel adapter that are destined for portions of an application memory space marked as being protected are converted to RAR receive messages and redirected to a queue pair associated with an operating system rather than the queue pair for the application. The operating system is responsible for serializing access to application memory pages outside of the host channel adapter. The mechanisms of the present invention may be used to perform a checkpoint data integrity operation.

Abstract: In one embodiment, an improved method for crawling a web site is provided. At least one page of the web site has a reference for executing by a browser to produce an address for a next page. The web site is crawled by the crawler program, which includes querying the web site server. The crawler parses such a reference from one of the web pages, and sends the reference to an applet running in the browser. The address for the next page is determined by the browser responsive to the reference. The address is then sent to the crawler. In an application of the improved crawler, the crawler is used for reducing dynamic data generation on the web site server. In this application, at least some of the web pages are dynamically generated responsive to the crawler queries. The server generated web pages are processed to generate corresponding processed versions of the web pages, so that the processed versions can be served in response to future queries, reducing dynamic generation of web pages by the server.

Abstract: In one embodiment, an improved method for crawling a web site is provided. At least one page of the web site has a reference for executing by a browser to produce an address for a next page. The web site is crawled by the crawler program, which includes querying the web site server. The crawler parses such a reference from one of the web pages, and sends the reference to an applet running in the browser. The address for the next page is determined by the browser responsive to the reference. The address is then sent to the crawler. In an application of the improved crawler, the crawler is used for reducing dynamic data generation on the web site server. In this application, at least some of the web pages are dynamically generated responsive to the crawler queries. The server generated web pages are processed to generate corresponding processed versions of the web pages, so that the processed versions can be served in response to future queries, reducing dynamic generation of web pages by the server.

Abstract: A method and apparatus for providing remote access redirect in a host channel adapter of a system area network are provided. The apparatus and method provide a mechanism by which a host channel adapter, in response to receiving a marker message, places selected channel(s) of the host channel adapter in a remote access redirect (RAR) mode of operation. During the RAR mode of operation, memory access messages received by the host channel adapter that are destined for portions of an application memory space marked as being protected are converted to RAR receive messages and redirected to a queue pair associated with an operating system rather than the queue pair for the application. The operating system is responsible for serializing access to application memory pages outside of the host channel adapter. The mechanisms of the present invention may be used to perform a checkpoint data integrity operation.

Abstract: A method and system for responding to a client request for information from a service device in a data processing network. Initially, the server receives the information request from the client and determines that the requested information is not in the server's cache. The server then generates a storage request and sends the storage request to a network attached storage device. The storage device retrieves the requested information and generates a set of packets containing the requested information. The storage device then sending the generated packets simultaneously to the client to satisfy the client request and to the server to refresh the server cache. The storage request may include protocol information corresponding to the client-server connection that the storage device uses to replicate the client-server protocol stack in the generated packet. Sending the generated packet may comprise including a multicast address in the packet.

Abstract: Cluster systems having central processor units (CPUs) with multiple processors (MPs) are configured as high density servers. Power density is managed within the cluster systems by assigning a utilization to persistent states and connections within the cluster systems. If a request to reduce overall power consumption within the cluster system is received, persistent states and connections are moved (migrated) within the multiple processors based on their utilization to balance power dissipation within the cluster systems. If persistent connections and states, that must be maintained have a low rate of reference, they may be maintained in processors that are set to a standby mode where memory states are maintained. In this way the requirement to maintain persistent connections and states does not interfere with an overall strategy of managing power within the cluster systems.

Abstract: A method and system are disclosed for enforcing consistency among replicas of a server through the reliable and ordered delivery of client requests via an ordering multicast protocol in association with a deterministic and pre-emptive scheduler in a computer network having at least one client connected to a replicated server. The scheduler enforces an execution order that conforms with the request ordering specified by the multicast protocol. The deterministic scheduler subdivides execution streams into instruction slices such that the number of instructions within each slice is pre-determined. An instruction counter is used to generate an interrupt at the expiration of an instruction slice. A thread is scheduled at the beginning of an instruction slice, such that all scheduling decisions are identical among all server replicas. Therefore, all scheduling decisions are identical everywhere, eliminating the nondeterminism due to time-based scheduling of traditional thread schedulers.

Abstract: A method and system for reliably and consistently delivering client requests in a computer network having at least one client connectable to one or more servers among a group of servers, wherein each server among the group of servers replicates a particular network service to ensure that the particular network service remains uninterrupted in the event of a server failure. A particular server is designated among the group of servers to manage client requests which seek to update a particular network service state, prior to any receipt of a client request which seeks to update the particular network service state by any remaining servers among the group of servers.

Abstract: A method, apparatus and computer program product are disclosed to enable independent verification of service level agreement between two parties. In one embodiment, a first party contracts the hosting service of a second party to provide said first party with Web page and services on second party's equipment. Said contract contains a Service Level Agreement specifying performance parameters and guarantees for the response time experienced by users of said Web page and services. Independent verification by a third party of said agreement is done for a fee through several steps. In a first step, said third party inserts measuring and reporting instructions into blocks of information maintained on the server of said second party. The measuring instructions are for delivery to the client with the blocks of information. The delivery of the instructions occurs responsive to a request for the information by the client. Once they are delivered, the instructions are executed by the client.