摘要:
Various technologies and techniques are disclosed for providing software accessible metadata on a cache of a central processing unit. A multiprocessor has at least one central processing unit. The central processing unit has a cache with cache lines that are augmented by cache metadata. The cache metadata includes software-controlled metadata identifiers that allow multiple logical processors to share the cache metadata. The metadata identifiers and cache metadata can then be used to accelerate various operations. For example, parallel computations can be accelerated using cache metadata and metadata identifiers. As another example, nested computations can be accelerated using metadata identifiers and cache metadata. As yet another example, transactional memory applications that include parallelism within transactions or that include nested transactions can be also accelerated using cache metadata and metadata identifiers.
摘要:
Various technologies and techniques are disclosed for providing software accessible metadata on a cache of a central processing unit. The metadata can include at least some bits for each virtual address, at least some bits for each cache line, and at least some bits for the cache overall. An instruction set architecture on the central processing unit is provided that includes additional instructions for interacting with the metadata. New side effects that are introduced into an operation of the central processing unit by a presence of the metadata and the additional instructions. The metadata can be accessed by at least one software program to facilitate an operation of the software program.
摘要:
Various technologies and techniques are disclosed for providing a hardware accelerated software transactional memory application. The software transactional memory application has access to metadata in a cache of a central processing unit that can be used to improve the operation of the STM system. For example, open read barrier filtering is provided that uses an opened-for-read bit that is contained in the metadata to avoid redundant open read processing. Similarly, redundant read log validation can be avoided using the metadata. For example, upon entering commit processing for a particular transaction, a get-evictions instruction in an instruction set architecture of the central processing unit is invoked. A retry operation can be optimized using the metadata. The particular transaction is aborted at a current point and put to sleep. The corresponding cache line metadata in the metadata are marked appropriately to efficiently detect a write by another CPU.
摘要:
Various technologies and techniques are disclosed for providing a bounded transactional memory application that accesses cache metadata in a cache of a central processing unit. When performing a transactional read from the bounded transactional memory application, a cache line metadata transaction-read bit is set. When performing a transactional write from the bounded transactional memory application, a cache line metadata transaction-write bit is set and a conditional store is performed. At commit time, if any lines marked with the transaction-read bit or the transaction-write bit were evicted or invalidated, all speculatively written lines are discarded. The application can also interrogate a cache line metadata eviction summary to determine whether a transaction is doomed and then take an appropriate action.
摘要:
The invention provides methods for sequencing a polynucleotide comprising stopping an extension cycle in a sequence by synthesis reaction before the reaction has run to near or fill completion.
摘要:
A software transactional memory system is described which utilizes decomposed software transactional memory instructions as well as runtime optimizations to achieve efficient performance. The decomposed instructions allow a compiler with knowledge of the instruction semantics to perform optimizations which would be unavailable on traditional software transactional memory systems. Additionally, high-level software transactional memory optimizations are performed such as code movement around procedure calls, addition of operations to provide strong atomicity, removal of unnecessary read-to-update upgrades, and removal of operations for newly-allocated objects. During execution, multi-use header words for objects are extended to provide for per-object housekeeping, as well as fast snapshots which illustrate changes to objects. Additionally, entries to software transactional memory logs are filtered using an associative table during execution, preventing needless writes to the logs. Finally a garbage collector with knowledge of the software transactional memory system compacts software transactional memory logs during garbage collection.
摘要:
A transactional memory programming interface allows a thread to directly and safely access one or more shared memory locations within a transaction while maintaining control structures to manage memory accesses to those same locations by one or more other concurrent threads. Each memory location accessed by the thread is associated with an enlistment record, and each thread maintains a transaction log of its memory accesses. Within a transaction, a read operation is performed directly on the memory location, and a write operation is attempted directly on the memory location, as opposed to some intermediate buffer. The thread can detect inconsistencies between the enlistment record of a memory location and the thread's transaction log to determine whether the memory accesses within the transaction are not reliable and the transaction should be re-tried.
摘要:
The present invention is a Virtual Mail House System that is an Internet-based management of direct mail campaigns from creation through completion that enables real time status reporting for customers. It entails online storage of Databases (a list of addresses to which physical mailers are sent), an online Library (a list of either predefined or user-uploaded documents), a process for creating, managing and tracking the campaign that also maintains a complete history of all activities for both the customer and each record in the database, and fulfillment management and acknowledgement system. The system also provides online contact management which includes the function of maintaining a contact history. When utilizing the present virtual mail house system a user can create a contact database, create a mail campaign, and manage and track the campaign from beginning to end.
摘要:
A messaging device is disclosed. The device is connected to a telephone line and communicates with other devices identical to itself via a communications link established over existing phone lines, power lines or via wireless communications mechanisms. The messaging device records caller ID data upon detection of an incoming telephone call and prompts the user to enter additional data regarding the caller in assembling a message data packet including predefined messages. The message data packet is then transmitted to an identical messaging device wherein the caller ID data, caller name, caller's company, and predefined messages are presented to the intended recipient of the message contained in the message data packet. Additional features include handwritten or typed detailed messages contained in said message data packet and security for preventing unauthorized viewing of message data. The messaging device is optionally integrated into the design of a telephone.
摘要:
A recreational water spray apparatus is disclosed. The apparatus may be provided a continuous pressurized flow of water without a pump to enhance continuity of a game by eliminating one or more delays to reload a water source. The apparatus may include a target disc disposed on a first end of the target control rod, a user throwing a projectile in an attempt to strike the target disc and upon the projectile striking the target disk, a conical spray of water is dispensed upon one or more user participants. Another embodiment of the recreational water spray apparatus is hinged. The hinged apparatus may allow a one piece upper frame tube and the safety barrier net to move at one or more different angles to a ground surface and allow the recreational water spray apparatus to be folded to create a slimmer profile for storage.