class Disk

Simulated secondary storage

Inheritance:

Public Methods

Disk( ID newID = 0, string newName = "Disk", TIME newSeek = 0.0, SIZE newRPM = 0, double newBandwidth = 0.0)

Default constructor

TIME getLatency(void) const

TIME getSeekTime(void) const

SIZE getRPM(void) const

double getBandwidth(void) const

TIME getTransferTime(MEMAMT dataSize = PAGESIZE)

void setSeekTime(const TIME newSeek)

Sets the disk arm movement time

void setRPM(const SIZE newRPM)

Sets the revolutions per minute of the disk

void setBandwidth(const double newBandwidth)

Sets the number of MB per second the disk can transfer

TIME calcTransferTime(MEMAMT dataSize = PAGESIZE)

Calculates the transfer time of one page from the disk

void calcLatency()

Calculates the average time it takes to reach the required page on disk

string toString(void) const

returns a string representation of the disk

Inherited from Resource:

Public Methods

virtual bool activate(const int numberOfServers = 1)

FacStatus request(const Token& tkn)

bool release(const int tkn_id)

bool clear(const int tkn_id)

bool isServicing(const int tkn_id) const

TIME getInUseTime(void) const

Inherited from SimObj:

Public Methods

string getName(void) const

ID getID(void) const

void setName(const string newName)

void setID(const ID newID)

Documentation

Simulates a hard disk. It has a latency (for r/w head) a read time and a write time.

Disk( ID newID = 0, string newName = "Disk", TIME newSeek = 0.0, SIZE newRPM = 0, double newBandwidth = 0.0)

TIME getLatency(void) const

Returns:

the rotational latency of the computer

TIME getSeekTime(void) const

Returns:

arm movement time

SIZE getRPM(void) const

Returns:

revolutions per minute of the disk

double getBandwidth(void) const

Returns:

MB per second bandwidth

TIME getTransferTime(MEMAMT dataSize = PAGESIZE)

Returns:

the calculated transfer time of a page from the disk

void setSeekTime(const TIME newSeek)

void setRPM(const SIZE newRPM)

void setBandwidth(const double newBandwidth)

TIME calcTransferTime(MEMAMT dataSize = PAGESIZE)

Nothing is returned from this function, but an internal transfer time variable is set. Access to this variable is via getTransferTime()

void calcLatency()

string toString(void) const

This class has no child classes.

Author:

John Oleszkiewicz

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