mems_piecewise_seek.h

disksim是一个非常优秀的磁盘仿真工具

/*
 * DiskSim Storage Subsystem Simulation Environment (Version 4.0)
 * Revision Authors: John Bucy, Greg Ganger
 * Contributors: John Griffin, Jiri Schindler, Steve Schlosser
 *
 * Copyright (c) of Carnegie Mellon University, 2001-2008.
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#ifndef _MEMS_PIECEWISE_SEEK_H_
#define _MEMS_PIECEWISE_SEEK_H_

#define _VERBOSE_ 0

#define NUM_CHUNKS 8  // number of chunks used to calculate the seek time
#define SWITCH_POINT (2 * NUM_CHUNKS / 2)  // index of the switch point

#define MEMS_SWITCH_ITERATIONS 9  // number of times to iterate to find the optimal switchpoint
#define MEMS_SHIFT_PERCENTAGE 0.05  // fraction of the seek distance by which to adjust the switch point

#define INWARD 1
#define OUTWARD 2

#define OVERALL_POSITIVE 1
#define OVERALL_NEGATIVE 2

double
find_dist_nm(double start_offset, double end_offset);

double
find_seek_time_piecewise(double start_offset_nm, double end_offset_nm,
			 double spring_factor, double acceleration_nm_s_s,
			 double length_nm, double velocity_nm_s);

double find_dist_nm(double start_offset, double end_offset);
#endif