synthgen.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
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MODULE synthgen
# this is a dummy that should never be called
PROTO int disksim_synthgen_loadparams(struct lp_block *b);

PARAM Storage capacity per device	I	1 
TEST i > 0
INIT (*result)->sectsperdisk = i;

This specifies the number of unique storage addresses per storage device
(in the corresponding device's unit of access) accessible to
generators of this type.


PARAM devices				LIST	1 
TEST !loadsynthdevs((*result), l)

This specifies the set of storage devices accessible to generators of
this type.  The devices may be either the names of individual devices
in a ``parts'' logorg or the name of an ``array'' logorg.

PARAM Blocking factor			I	1 
TEST i > 0
INIT (*result)->blocksize = i;

This specifies a unit of access for generated requests that is a multiple
of the storage devices' unit of access.  All generated request
starting addresses and sizes will be a multiple of this value.

PARAM Probability of sequential access		D	1 
TEST RANGE(d,0.0,1.0)
INIT (*result)->probseq = d;

This specifies the probability that a generated request is sequential to
the immediately previous request.  A sequential request starts at the
address immediately following the last address accessed by the
previously generated request.


PARAM Probability of local access		D	1 
TEST RANGE(d,0.0,1.0)
INIT (*result)->probloc = d;

This specifies the probability that a generated request is ``local'' to
the immediately previous request.  A local request begins some short
distance away from the previous request's starting address, where the
distance is computed via a random variable definition described below.

PARAM Probability of read access		D	1 
TEST RANGE(d,0.0,1.0)
INIT (*result)->probread = d;

This specifies the probability that a generated request is a read.

PARAM Probability of time-critical request	D	1 
TEST RANGE(d,0.0,1.0)
INIT (*result)->probtmcrit = d;

This specifies the probability that a generated request is time-critical.
That is, the corresponding generator process ``blocks'' and waits for
the request to complete before continuing with its sequence of work
(i.e., its next think time) \cite{Ganger93,Ganger95}.

PARAM Probability of time-limited request	D	1 
TEST RANGE(d,0.0,1.0)
INIT (*result)->probtmlim = d;

This specifies the probability that a generated request is
time-limited. That is, the corresponding generator process ``blocks''
and waits for the request to complete (if it is not already complete)
after a given amount of think time (specified by the below ``time
limit'' parameters) \cite{Ganger93,Ganger95}.


# first list item is dist'n type remainder is dist'n parameters 
PARAM Time-limited think times		LIST	1 
TEST !loaddistn(l, &(*result)->tmlimit)

This is a random variable distribution specifying the time limit for a
time-limited request.  Note that the generated time limit (i.e., the
computation time occuring before the generator process ``blocks'' and
waits for the request to complete) may differ from the actual time
limit (due to CPU contention).


PARAM General inter-arrival times	LIST	1 
TEST !loaddistn(l, &(*result)->genintr)

This is a random variable distribution specifying the inter-request think time
preceding the generated request if the generated request's starting
address is unrelated to the previous request's starting address (i.e.,
if the generated request's address is ``random'' rather than
``sequential'' or ``local'').

PARAM Sequential inter-arrival times	LIST	1 
TEST !loaddistn(l, &(*result)->seqintr)

This is a random variable distribution specifying the inter-request think
time preceding the generated request if the generated request's
starting address is ``sequential'' to the previous request's starting
address.

PARAM Local inter-arrival times		LIST	1 
TEST !loaddistn(l, &(*result)->locintr)

This is a random variable distribution specifying the inter-request think time
preceding the generated request if the generated request's starting
address is ``local'' to the previous request's starting address.

PARAM Local distances			LIST	1 
TEST !loaddistn(l, &(*result)->locdist)

This is a random variable distribution specifying the distance from the
previous request's starting address when generating a ``local''
request's starting address.


PARAM Sizes				LIST	1 
TEST !loaddistn(l, &(*result)->sizedist)

This is a random variable distribution specifying the request size.