Performance monitoring hardware is available on most modern microprocessors in the form of hardware counters and other registers that record data about processor events. This hardware may be used in counting mode, in which aggregate events counts are accumulated, and/or in sampling mode, in which time-based or event-based sampling is used to collect pro ling data. This paper discusses uses of t...

Performance monitoring hardware is available on most modern microprocessors in the form of hardware counters and other registers that record data about processor events. This hardware may be used in counting mode, in which aggregate event counts are accumulated, and/or in sampling mode, in which time-based or event-based sampling is used to collect profiling data. This paper discusses uses of t...

This report examines performance of four models with two compilers on the Intel Pentium 4 Xeon processor using the PAPI performance event library to collect performance counter values. The intent is to identify performance metrics that indicate where performance inhibiting factors occur when the codes execute. Results for operations, instructions, cycles, cache, table lookaside buffer misses, b...

The means by which homing pigeons determine the direction to their home loft when released in unfamiliar territory remains a mystery. Hypotheses involving the sun (Matthews, 1953, 1955), Coriolis force and the earth's magnetic field (Yeagley, 1947, 1951), inertial cues (Barlow, 1964, 1966), infrasound (Kreithen & Quine, 1979), have been advanced but currently there is no strong empirical suppor...

Abstract Pulmonary artery pulsatility index (PAPi) is an indicator of right ventricular (RV) function and independent predictor failure (RVF) following left assist device (LVAD) implantation. Administration vasodilator challenge during heart catheterization (RHC) could reduce RV workload allowing a better assessment its functional reserve. Patients undergoing LVAD implantation at our Institutio...