Engineering, 08.09.2021 23:10 christson805
Let α be the percentage of a program code which can be executed simultaneously by n processors of a multiprocessor system. Assume that the remaining code must be executed sequentially on a single processor. Each processor has an execution rate of x MIPS, and all of the processors are equally capable.
(a) Derive an expression for the effective MIPS rate when using the system to execute this program, in terms of the parameters n, x, and α.
(b) Let consider the synchronization overhead. When adding an additional processor, the total number of instructions will be increased byβpercent. These added instructions are for synchronization only and they canbe executed in parallel. What will be the speedup of the multiprocessor system?
Answers: 2
Engineering, 04.07.2019 18:10
Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?
Answers: 1
Engineering, 04.07.2019 18:20
Find the kinematic pressure of 160kpa. for air, r-287 j/ kg k. and hair al viscosity of air at a temperature of 50°c and an absolute (10 points) (b) find the dynamic viscosity of air at 110 °c. sutherland constant for air is 111k
Answers: 3
Engineering, 04.07.2019 18:20
Acertain flow of air (at stp) has a velocity distribution given by v i (in ft/s). if this flow is going through a 4 ft square area in the yz-plane (centered at the origin), what is the mass flow rate (in lbm/s)?
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Engineering, 06.07.2019 03:20
Asimply supported beam abc of length l has ab of length hl and second moment of area / and bc of length hl and second moment of area i2. determine the strain energy stored in the beam when it is subject to a vertical load f at its midpoint and the consequential central deflection.
Answers: 2
Let α be the percentage of a program code which can be executed simultaneously by n processors of a...
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