International Business Machines Corporation

Charles Rudolph Schmitt

Francis Daniel Lawlor

Timothy John Guenthner

Mark Alan Peloquin

David Medina

Dah-Haur H Lin

William Henry Hartner

Allen Chester Wynn

James Franklin Macon, Jr

A method of routing in a computer network having a pool of servers capable of servicing requests for access to a set of server resource objects. The set of server resource objects are distributed in a non-homogeneous manner across the server pool. According to the method, each incoming client request for access to a specified server resource object is targeted to a router having an associated port space identifying a plurality of ports. Based on the port on which an incoming client request is received, the request is mapped to one of the server resource objects. The router then selects the &ldquo;best provider&rdquo; and redirects or forwards the request to that server. The routing and redirection is based upon the port for the incoming request.

Mapping web server objects to TCP/IP ports

A method of dynamically generating a Web page at a Web server in response to an HTTP request from a Web client in a computer network. The Web page has a hypertext reference identifying a linked page supported on each of a set of other servers in the computer network. In response to the request, a given one of the set of other servers is identified based on some given criteria, e.g., shortest access time, lightest current load, or the like. Information identifying a path to the identified other server is then inserted into the hypertext reference as the Web page (including the hypertext reference) is returned to the Web client in response to the request. Thus, if the hypertext reference is later activated by the user browsing the returned Web page, the linked page is preferentially served from the identified other server.

Generation of smart HTML anchors in dynamic web page creation

One or more policies are implemented at a Web browser to enhance access to Web servers that host content requested by the browser. When the browser issues a request, a name service returns a list of IP addresses that may service that request. The list is configured as 'random' or 'ordered' according to a given naming convention or other local policy, and IP addresses are selected from the list at random or in order (as the case may be) until a connection to an appropriate server is obtained. The browser remembers (for a given time period) which IP addresses have failed so that those addresses are not repeatedly tried. The browser's 'timeout' period is also selectively varied depending on the type of list returned from the name service.

High availability web browser access to servers

An apparatus and method for allocating virtual memory upon demand to reduce the amount of virtual memory allocated. Privilege level transitions requested by a program of instructions invoke a fault handler routine which allocates memory for implementing the transition. Allocation of memory is thus delayed until such request for privilege level transition occurs.

Apparatus and method allocating virtual memory upon demand

A multiprocessor computing system has memory shared by all processors of the computing system and includes an symmetric multiprocessor (SMP) operating system and at least one external device controlled by a device driver. The device driver is typically written to run in a uniprocessor environment. A method for protecting the execution state of the device driver uses a pair of 'collaborative' spinlocks, an interrupt time spinlock and a task time spinlock. At task time, prior to calling the device driver, the task time spin lock is acquired by the operating system. The operating system then waits until the interrupt time spinlock is in an 'unowned' state before calling the device driver. Upon return from the device driver, the operating system releases the task time spinlock. At interrupt time, prior to calling the device driver's interrupt handler, the interrupt time spinlock is acquired by the operating system. The operating system then determines if the task time spinlock is owned. If it is owned, the operating system then issues an interprocessor interrupt (IPI) to the processor owning the task time spinlock, thus placing that processor into a predetermined 'spin' state. The receiving processor remains in the spinning state until return of the device driver execution.

Growing community of inventors

Austin, TX, United States of America

Charles Rudolph Schmitt