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In order to produce MPI applications that perform well on today's parallel architectures, programmers need effective tools for collecting and analyzing performance data. Because programmers typically work on more than one platform, cross-platform tools are highly desirable. A variety of such tools, both commercial and research, are becoming available.(More)
The PAPI project has defined and implemented a cross-platform interface to the hardware counters available on most modern microprocessors. The interface has gained widespread use and acceptance from hardware vendors, users, and tool developers. This paper reports on experiences with the community-based open-source effort to define the PAPI specification and(More)
PAPI is a specification of a cross-platform interface to hardware performance counters on modern microprocessors. These counters exist as a small set of registers that count events, which are occurrences of specific signals related to a processor's function. Monitoring these events has a variety of uses in application performance analysis and tuning. The(More)
The purpose of the PAPI project is to specify a standard API for accessing hardware performance counters available on most modern microprocessors. These counters exist as a small set of registers that count “events”, which are occurrences of specific signals and states related to the processor's function. Monitoring these events facilitates(More)
One purpose of the end-user tools described in this paper is to give users a graphical representation of performance information that has been gathered by instrumenting an application with the PAPI library. PAPI is a project that specifies a standard API for accessing hardware performance counters available on most modern microprocessors. These counters(More)
The purpose of the PAPI project is to specify a standard API for accessing hardware performance counters available on most modern microprocessors. These counters exist as a small set of registers that count "eve nts", which are occurrences of specific signals and states related to the processor's function. Monitoring these events facilitates correlation(More)
Whether and when children use information about others' mental states to invent or select persuasive strategies were examined. In Study 1, preschoolers, 3rd-graders, and 6th-graders (ns = 11, 12, and 16, respectively; 17 girls) were told about story characters' persuading parents to buy pets or toys. Children were either given or not given information about(More)
  • S Browne, J Dongarra, N Garner, K London, P Mucci
  • 2000
The purpose of the PAPI project is to specify a standard API for accessing hardware performance counters available on most modern microprocessors. These counters exist as a small set of registers that count "events", which are occurrences of specific signals and states related to the processor's function. Monitoring these events facilitates correlation(More)
OBJECTIVE The aim of this study was to determine if zolpidem is associated with improved responsiveness or regional cerebral perfusion in patients with persistent vegetative states. METHODS Following ethics approval, children with persistent vegetative state were enrolled in a prospective, double-blind, placebo-controlled randomised trial. Patients(More)