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-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: ch_19_ds-qn.vhd,v 1.3 2001-10-26 16:29:36 paw Exp $
-- $Revision: 1.3 $
--
-- ---------------------------------------------------------------------
library qsim;
use qsim.qsim_types.all, random.random.all;
architecture queue_net of disk_system is
constant disk_cache_miss_rate : real := 0.2;
constant num_disks : positive := 2;
constant disk_cache_fork_probabilities : probability_vector(1 to num_disks)
:= ( others => disk_cache_miss_rate / real(num_disks) );
signal info_detail_control : info_detail_type := none;
signal new_job, cpu_queue_in, cpu_in, cpu_out,
quantum_expired, job_done, requesting_disk,
disk_cache_hit, request_done : arc_type;
signal disk_cache_miss, disk_done : arc_vector(1 to num_disks);
signal cpu_ready : boolean;
begin
new_jobs : entity source
generic map ( name => "new_jobs",
distribution => exponential,
mean_inter_arrival_time => 2 sec,
seed => sample_seeds(1),
time_unit => ms,
info_file_name => "new_jobs.dat" )
port map ( out_arc => new_job,
info_detail => info_detail_control );
cpu_join : entity join
generic map ( name => "cpu_join",
time_unit => ms,
info_file_name => "cpu_join.dat" )
port map ( in_arc(1) => quantum_expired,
in_arc(2) => new_job,
in_arc(3) => request_done,
out_arc => cpu_queue_in,
info_detail => info_detail_control );
cpu_queue : entity queue
generic map ( name => "cpu_queue",
time_unit => ms,
info_file_name => "cpu_queue.dat" )
port map ( in_arc => cpu_queue_in,
out_arc => cpu_in,
out_ready => cpu_ready,
info_detail => info_detail_control );
cpu : entity server
generic map ( name => "cpu",
distribution => uniform,
mean_service_time => 50 ms,
seed => sample_seeds(2),
time_unit => ms,
info_file_name => "cpu.dat" )
port map ( in_arc => cpu_in,
in_ready => cpu_ready,
out_arc => cpu_out,
info_detail => info_detail_control );
cpu_fork : entity fork
generic map ( name => "cpu_fork",
probabilities => ( 1 => 0.5, 2 => 0.45 ),
seed => sample_seeds(3),
time_unit => ms,
info_file_name => "cpu_fork.dat" )
port map ( in_arc => cpu_out,
out_arc(1) => quantum_expired,
out_arc(2) => requesting_disk,
out_arc(3) => job_done,
info_detail => info_detail_control );
job_sink : entity sink
generic map ( name => "job_sink",
time_unit => ms,
info_file_name => "job_sink.dat" )
port map ( in_arc => job_done,
info_detail => info_detail_control );
disk_cache_fork : entity fork
generic map ( name => "disk_cache_fork",
probabilities => disk_cache_fork_probabilities,
seed => sample_seeds(4),
time_unit => ms,
info_file_name => "disk_cache_fork.dat" )
port map ( in_arc => requesting_disk,
out_arc(1 to num_disks) => disk_cache_miss,
out_arc(num_disks + 1) => disk_cache_hit,
info_detail => info_detail_control );
disk_array : for disk_index in 1 to num_disks generate
constant disk_index_str : string := integer'image(disk_index);
signal disk_in : arc_type;
signal disk_ready : boolean;
begin
disk_queue : entity queue
generic map ( name => "disk_queue_" & disk_index_str,
time_unit => ms,
info_file_name => "disk_queue_" & disk_index_str & ".dat" )
port map ( in_arc => disk_cache_miss(disk_index),
out_arc => disk_in,
out_ready => disk_ready,
info_detail => info_detail_control );
disk : entity server
generic map ( name => "disk_" & disk_index_str,
distribution => exponential,
mean_service_time => 15 ms,
seed => sample_seeds(4 + disk_index),
time_unit => ms,
info_file_name => "disk_" & disk_index_str & ".dat" )
port map ( in_arc => disk_in,
in_ready => disk_ready,
out_arc => disk_done(disk_index),
info_detail => info_detail_control );
end generate disk_array;
disk_cache_join : entity join
generic map ( name => "disk_cache_join",
time_unit => ms,
info_file_name => "disk_cache_join.dat" )
port map ( in_arc(1 to num_disks) => disk_done,
in_arc(num_disks + 1) => disk_cache_hit,
out_arc => request_done,
info_detail => info_detail_control );
end architecture queue_net;
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