摘要:
A method and system for consolidating N elements of an enterprise IT structure that consists of L elements (N≦L). All combinations of M elements of the N elements are generated (M
摘要:
Apparatus for protecting memory storage blocks (page frames) against unwanted I/O accesses, including I/O data transferred in an unwanted direction. I/O storage keys are provided in an I/O protection array. Each I/O key is comprised of one or two bits and is associated with a respective storage block in computer memory. If the array contains two bit I/O keys, each key has 4 settings for controlling I/O accesses to an associated storage block; which: 1) inhibit an I/O access in the input direction of I/O data flow, 2) inhibit an I/O access in the output direction of I/O data flow, 3) allow I/O accesses in both directions, or 4) prevent all I/O accesses. If the array contains single bit I/O storage keys, each key has two settings, which: 1) prevent all I/O accesses in the associated storage block, or 2) allow all I/O accesses in the associated block. No I/O program keys are needed for controlling this type of I/O protection, which avoids key comparison operations by the I/O access protection apparatus. Nevertheless, the use of the subject I/O protection apparatus does not prevent the use of apparatus for protecting the same storage blocks from unwanted accesses by central processors, which may use CPU storage keys. Such CPU storage keys may be contained in a hardware array, or may be contained in a virtual storage page table without having any hardware CPU storage key array. If desired, the subject I/O storage protection apparatus may be used without providing any CPU storage protection.
摘要:
In an object-oriented computer system, an object can exist in a split state or a merged state. When in the split state, the object has multiple instances. When in the merged state, the object has a single instance. A request for migrating the object between the split state and the merged state is identified. In response thereto, the object is migrated therebetween. The object's state is preserved during the migration by consolidating the state of multiple instances of the object, or by copying the state of a single, merged, instance of the object.
摘要:
A recovery mechanism enabling recovery to be performed along logical execution paths of tasks processing within a computer system. Tasks executing within the computer system invoke one another in a logical invocation sequence. The recovery mechanism allows a task to initiate recovery for another task, such that recovery follows the logical sequence of events. The recovery mechanism is applicable to procedural, as well as object-oriented systems, and is usable with homogeneous and heterogeneous systems.
摘要:
A method and system are provided for executing a service processor request within a data processing system having one or more processors within a central processing complex, each of the processors within the central processing complex including allocatable processor resources. Each of the processors within the central processing complex is provided with the capability of processing selected service processor requests by reserving a portion of the allocatable processor resources within each of the processors for such purpose. A service processor request within the central processing complex is initially processed utilizing at least one of the processors in response to receiving a service processor request, if sufficient processor resources are available to process the service processor request within the reserved portion of the allocatable resources. Alternatively, the service processor request is transmitted to an external processing complex, if insufficient processor resources are available to process the service processor request within the reserved portion of the allocatable resources.
摘要:
In a computer system, a computer program is provided having multiple sections. First and second sections of the computer program correspond to different execution environments. Each of the first section and second section is automatically compiled for its corresponding execution environment. Further, the multiple sections of the computer program may call each other via intra-program type procedure calls. These intra-program type procedure calls are automatically translated into inter-execution environment type procedure calls, between the sections, for their respective execution environments.
摘要:
Techniques are presented for efficiently transferring computer code from a source computer to a target computer for execution on the target computer. A virtual memory space for the computer code is created on the target computer. The computer code is linked on the source computer such that addressing of the resulting executable version of the computer code corresponds to the allocated virtual memory space on the target computer. The executable computer code is then stored in the memory of the source computer. As the target computer executes the computer code, page faults result because its allocated virtual memory space is empty. The memory pages required to remediate the page faults are obtained from the source computer on an on-demand basis. Execution accordingly proceeds.
摘要:
In an object-oriented computer system having multiple execution environments, a source code of a computer program is provided having multiple classes therein. The classes have affinities for execution environment type characteristics defined therewith. For each class, an execution environments is determined that satisfies the affinities of the class, and the class is compiled for the determined execution environment. As examples, affinities may include those directed toward processors, operating systems, user interfaces and software resources.
摘要:
A method and system for porting an abstract Information Technology (IT) structure into an IT delivery environment. An abstract IT structure A that is currently within an IT delivery environment X is translated by generating a virtual IT structure V from the abstract IT structure A through specification of an IT delivery environment Y. Delivery binding the virtual IT structure V to the IT delivery environment Y generates a delivery-bound virtual IT structure D. The delivery-bound virtual IT structure D is deployed in the IT delivery environment Y, resulting in a real IT structure instance R capable of operating in the IT delivery environment Y.
摘要:
A method and system for consolidating N elements of an enterprise IT structure that consists of L elements (N≦L). All combinations of M elements of the N elements are generated (M