simpledisk.modspec

目前最精确的磁盘模拟器的第3版

# DiskSim Storage Subsystem Simulation Environment (Version 3.0)
# Revision Authors: John Bucy, Greg Ganger
# Contributors: John Griffin, Jiri Schindler, Steve Schlosser
#
# Copyright (c) of Carnegie Mellon University, 2001, 2002, 2003.
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MODULE simpledisk
PROTO struct simpledisk *disksim_simpledisk_loadparams(struct lp_block *b);

PARAM Scheduler					BLOCK	1 
TEST result->queue = (struct ioq *)disksim_ioqueue_loadparams(blk, device_printqueuestats, device_printcritstats, device_printidlestats, device_printintarrstats, device_printsizestats)
# INIT ioqueue_initialize(result->queue, 0);

This is an ioqueue; see Section \ref{param.queue} for details.

PARAM Max queue length				I	1 
TEST i >= 0
INIT result->maxqlen = i;

This specifies the maximum number of requests that the simpledisk can have
in service or queued for service at any point in time.  During
initialization, other components request this information and respect
it during simulation.

PARAM Block count				I	1 
TEST i >= 1
INIT result->numblocks = i;

This specifies the capacity of the simpledisk in blocks.


PARAM Bus transaction latency			D	0
TEST d >= 0.0
INIT result->bus_transaction_latency = d;

This specifies the delay involved at the simpledisk for each message that
it transfers.

PARAM Bulk sector transfer time			D	1 
TEST d >= 0.0
INIT result->blktranstime = d;

This specifies the time necessary to transfer a single 512-byte block to,
from or through the controller.  Transferring one block over the bus
takes the maximum of this time, the block transfer time specified for
the bus itself, and the block transfer time specified for the
component on the other end of the bus transfer.


PARAM Never disconnect				I	1
TEST RANGE(i,0,1)
INIT result->neverdisconnect = i;

This specifies whether or not the simpledisk retains ownership of the bus
during the entire processing and servicing of a request (i.e.,~from
arrival to completion).  If false~(0), the simpledisk may release the
bus whenever it is not needed for transferring data or control
information.

PARAM Print stats				I	1 
TEST RANGE(i,0,1)
INIT result->printstats = i;

Specifies whether or not statistics for the simpledisk will be reported.

PARAM Command overhead				D	1 
TEST d >= 0.0
INIT result->overhead = d;

This specifies a per-request processing overhead that takes place
immediately after the arrival of a new request at the disk.

# err ... I'm not sure why there are 2 of these here
PARAM Constant access time			D	0
TEST d >= 0.0
INIT result->acctime = d;

This specifies the fixed per-request access time (i.e.,~actual mechanical
activity is not simulated).

PARAM Access time				D	1  
TEST d >= 0.0
INIT result->acctime = d;

Synonym for \texttt{Constant access time}.