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195 lines
6.2 KiB
195 lines
6.2 KiB
#! /usr/bin/env python
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import sys
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from optparse import OptionParser
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import random
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# process states
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STATE_RUNNING = 'RUNNING'
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STATE_READY = 'READY'
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STATE_DONE = 'DONE'
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# members of process structure
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PROC_CODE = 'code_'
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PROC_PC = 'pc_'
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PROC_ID = 'pid_'
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PROC_STATE = 'proc_state_'
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# things a process can do
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DO_COMPUTE = 'cpu'
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DO_YIELD = 'yld'
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class scheduler:
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def __init__(self):
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# keep set of instructions for each of the processes
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self.proc_info = {}
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return
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def new_process(self):
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proc_id = len(self.proc_info)
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self.proc_info[proc_id] = {}
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self.proc_info[proc_id][PROC_PC] = 0
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self.proc_info[proc_id][PROC_ID] = proc_id
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self.proc_info[proc_id][PROC_CODE] = []
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self.proc_info[proc_id][PROC_STATE] = STATE_READY
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return proc_id
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def load(self, program_description):
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proc_id = self.new_process()
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tmp = program_description.split(':')
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if len(tmp) != 2:
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print 'Bad description (%s): Must be number <x:y>'
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print ' where X is the number of instructions'
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print ' and Y is the percent change that an instruction is CPU not YIELD'
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exit(1)
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num_instructions, chance_cpu = int(tmp[0]), float(tmp[1])/100.0
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for i in range(num_instructions):
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if random.random() < chance_cpu:
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self.proc_info[proc_id][PROC_CODE].append(DO_COMPUTE)
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else:
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self.proc_info[proc_id][PROC_CODE].append(DO_YIELD)
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return
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#change to READY STATE, the current proc's state should be expected
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#if pid==-1, then pid=self.curr_proc
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def move_to_ready(self, expected, pid=-1):
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#YOUR CODE
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return
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#change to RUNNING STATE, the current proc's state should be expected
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def move_to_running(self, expected):
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#YOUR CODE
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return
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#change to DONE STATE, the current proc's state should be expected
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def move_to_done(self, expected):
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#YOUR CODE
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return
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#choose next proc using FIFO/FCFS scheduling, If pid==-1, then pid=self.curr_proc
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def next_proc(self, pid=-1):
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#YOUR CODE
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return
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def get_num_processes(self):
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return len(self.proc_info)
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def get_num_instructions(self, pid):
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return len(self.proc_info[pid][PROC_CODE])
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def get_instruction(self, pid, index):
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return self.proc_info[pid][PROC_CODE][index]
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def get_num_active(self):
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num_active = 0
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for pid in range(len(self.proc_info)):
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if self.proc_info[pid][PROC_STATE] != STATE_DONE:
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num_active += 1
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return num_active
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def get_num_runnable(self):
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num_active = 0
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for pid in range(len(self.proc_info)):
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if self.proc_info[pid][PROC_STATE] == STATE_READY or \
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self.proc_info[pid][PROC_STATE] == STATE_RUNNING:
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num_active += 1
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return num_active
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def space(self, num_columns):
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for i in range(num_columns):
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print '%10s' % ' ',
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def check_if_done(self):
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if len(self.proc_info[self.curr_proc][PROC_CODE]) == 0:
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if self.proc_info[self.curr_proc][PROC_STATE] == STATE_RUNNING:
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self.move_to_done(STATE_RUNNING)
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self.next_proc()
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return
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def run(self):
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clock_tick = 0
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if len(self.proc_info) == 0:
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return
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# make first one active
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self.curr_proc = 0
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self.move_to_running(STATE_READY)
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# OUTPUT: heade`[rs for each column
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print '%s' % 'Time',
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for pid in range(len(self.proc_info)):
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print '%10s' % ('PID:%2d' % (pid)),
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print ''
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# init statistics
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cpu_busy = 0
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while self.get_num_active() > 0:
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clock_tick += 1
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# if current proc is RUNNING and has an instruction, execute it
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# statistics clock_tick
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instruction_to_execute = ''
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if self.proc_info[self.curr_proc][PROC_STATE] == STATE_RUNNING and \
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len(self.proc_info[self.curr_proc][PROC_CODE]) > 0:
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#YOUR CODE
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# OUTPUT: print what everyone is up to
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print '%3d ' % clock_tick,
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for pid in range(len(self.proc_info)):
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if pid == self.curr_proc and instruction_to_execute != '':
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print '%10s' % ('RUN:'+instruction_to_execute),
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else:
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print '%10s' % (self.proc_info[pid][PROC_STATE]),
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print ''
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# if this is an YIELD instruction, switch to ready state
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# and add an io completion in the future
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if instruction_to_execute == DO_YIELD:
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#YOUR CODE
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# ENDCASE: check if currently running thing is out of instructions
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self.check_if_done()
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return (clock_tick)
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#
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# PARSE ARGUMENTS
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#
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parser = OptionParser()
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parser.add_option('-s', '--seed', default=0, help='the random seed', action='store', type='int', dest='seed')
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parser.add_option('-l', '--processlist', default='',
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help='a comma-separated list of processes to run, in the form X1:Y1,X2:Y2,... where X is the number of instructions that process should run, and Y the chances (from 0 to 100) that an instruction will use the CPU or issue an YIELD',
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action='store', type='string', dest='process_list')
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parser.add_option('-p', '--printstats', help='print statistics at end; only useful with -c flag (otherwise stats are not printed)', action='store_true', default=False, dest='print_stats')
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(options, args) = parser.parse_args()
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random.seed(options.seed)
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s = scheduler()
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# example process description (10:100,10:100)
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for p in options.process_list.split(','):
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s.load(p)
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print 'Produce a trace of what would happen when you run these processes:'
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for pid in range(s.get_num_processes()):
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print 'Process %d' % pid
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for inst in range(s.get_num_instructions(pid)):
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print ' %s' % s.get_instruction(pid, inst)
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print ''
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print 'Important behaviors:'
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print ' System will switch when the current process is FINISHED or ISSUES AN YIELD'
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(clock_tick) = s.run()
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if options.print_stats:
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print ''
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print 'Stats: Total Time %d' % clock_tick
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print ''
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