starting work on modified process-run.py to show pio/interrupt concepts
This commit is contained in:
Remzi Arpaci-Dusseau
parent
46b567b672
commit
1df0632939
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#! /usr/bin/env python
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from __future__ import print_function
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import sys
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from optparse import OptionParser
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import random
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# to make Python2 and Python3 act the same -- how dumb
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def random_seed(seed):
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try:
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random.seed(seed, version=1)
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except:
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random.seed(seed)
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return
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# process switch behavior
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SCHED_SWITCH_ON_IO = 'SWITCH_ON_IO'
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SCHED_SWITCH_ON_END = 'SWITCH_ON_END'
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# io finished behavior
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IO_RUN_LATER = 'IO_RUN_LATER'
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IO_RUN_IMMEDIATE = 'IO_RUN_IMMEDIATE'
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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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STATE_WAIT = 'WAITING'
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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_IO = 'io'
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DO_PROGRAMMED_IO = 'p_io'
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class scheduler:
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def __init__(self, process_switch_behavior, io_done_behavior, io_length, interrupt_overhead):
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# keep set of instructions for each of the processes
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self.proc_info = {}
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self.process_switch_behavior = process_switch_behavior
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self.io_done_behavior = io_done_behavior
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self.io_length = io_length
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self.interrupt_overhead = interrupt_overhead
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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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# is this dead code? why is it here? no one knows...
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def load_file(self, progfile):
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fd = open(progfile)
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proc_id = self.new_process()
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for line in fd:
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tmp = line.split()
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if len(tmp) == 0:
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continue
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opcode = tmp[0]
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if opcode == 'compute':
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assert(len(tmp) == 2)
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for i in range(int(tmp[1])):
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self.proc_info[proc_id][PROC_CODE].append(DO_COMPUTE)
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elif opcode == 'io':
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assert(len(tmp) == 1)
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self.proc_info[proc_id][PROC_CODE].append(DO_IO)
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fd.close()
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return
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# program looks like this:
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# c7,i,c1,i
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# which means
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# compute for 7, then i/o, then compute for 1, then i/o
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def load_program(self, program):
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proc_id = self.new_process()
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for line in program.split(','):
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opcode = line[0]
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if opcode == 'c': # compute
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num = int(line[1:])
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for i in range(num):
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self.proc_info[proc_id][PROC_CODE].append(DO_COMPUTE)
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elif opcode == 'i':
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self.proc_info[proc_id][PROC_CODE].append(DO_IO)
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elif opcode == 'p':
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for i in range(self.io_length):
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self.proc_info[proc_id][PROC_CODE].append(DO_PROGRAMMED_IO)
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else:
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print('bad opcode %s (should be c or i)' % opcode)
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exit(1)
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return
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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>' % program_description)
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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 IO')
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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_IO)
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return
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def move_to_ready(self, expected, pid=-1):
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if pid == -1:
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pid = self.curr_proc
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assert(self.proc_info[pid][PROC_STATE] == expected)
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self.proc_info[pid][PROC_STATE] = STATE_READY
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return
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def move_to_wait(self, expected):
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assert(self.proc_info[self.curr_proc][PROC_STATE] == expected)
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self.proc_info[self.curr_proc][PROC_STATE] = STATE_WAIT
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return
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def move_to_running(self, expected):
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assert(self.proc_info[self.curr_proc][PROC_STATE] == expected)
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self.proc_info[self.curr_proc][PROC_STATE] = STATE_RUNNING
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return
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def move_to_done(self, expected):
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assert(self.proc_info[self.curr_proc][PROC_STATE] == expected)
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self.proc_info[self.curr_proc][PROC_STATE] = STATE_DONE
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return
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def next_proc(self, pid=-1):
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if pid != -1:
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self.curr_proc = pid
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self.move_to_running(STATE_READY)
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return
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for pid in range(self.curr_proc + 1, len(self.proc_info)):
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if self.proc_info[pid][PROC_STATE] == STATE_READY:
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self.curr_proc = pid
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self.move_to_running(STATE_READY)
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return
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for pid in range(0, self.curr_proc + 1):
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if self.proc_info[pid][PROC_STATE] == STATE_READY:
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self.curr_proc = pid
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self.move_to_running(STATE_READY)
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return
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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 get_ios_in_flight(self, current_time):
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num_in_flight = 0
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for pid in range(len(self.proc_info)):
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for t in self.io_finish_times[pid]:
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if t > current_time:
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num_in_flight += 1
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return num_in_flight
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def check_for_switch(self):
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return
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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' % ' ', end='')
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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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#
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# all the work is done here, one tick at a time
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#
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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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# track outstanding IOs, per process
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self.io_finish_times = {}
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for pid in range(len(self.proc_info)):
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self.io_finish_times[pid] = []
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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: headers for each column
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print('%s' % 'Time', end='')
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for pid in range(len(self.proc_info)):
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print('%10s' % ('PID:%2d' % (pid)), end='')
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print('%10s' % 'CPU', end='')
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print('%10s' % 'IOs', end='')
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print('')
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# init statistics
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io_busy = 0
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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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# check for io finish
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io_done = False
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for pid in range(len(self.proc_info)):
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if clock_tick in self.io_finish_times[pid]:
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io_done = True
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self.move_to_ready(STATE_WAIT, pid)
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if self.io_done_behavior == IO_RUN_IMMEDIATE:
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# IO_RUN_IMMEDIATE
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if self.curr_proc != pid:
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if self.proc_info[self.curr_proc][PROC_STATE] == STATE_RUNNING:
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self.move_to_ready(STATE_RUNNING)
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self.next_proc(pid)
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else:
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# IO_RUN_LATER
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if self.process_switch_behavior == SCHED_SWITCH_ON_END and self.get_num_runnable() > 1:
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# this means the process that issued the io should be run
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self.next_proc(pid)
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if self.get_num_runnable() == 1:
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# this is the only thing to run: so run it
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self.next_proc(pid)
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self.check_if_done()
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# if current proc is RUNNING and has an instruction, execute it
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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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instruction_to_execute = self.proc_info[self.curr_proc][PROC_CODE].pop(0)
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cpu_busy += 1
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# OUTPUT: print what everyone is up to
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if io_done:
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print('%3d*' % clock_tick, end='')
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else:
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print('%3d ' % clock_tick, end='')
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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), end='')
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else:
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print('%10s' % (self.proc_info[pid][PROC_STATE]), end='')
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if instruction_to_execute == '':
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print('%10s' % ' ', end='')
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else:
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print('%10s' % 1, end='')
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num_outstanding = self.get_ios_in_flight(clock_tick)
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if num_outstanding > 0:
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print('%10s' % str(num_outstanding), end='')
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io_busy += 1
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else:
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print('%10s' % ' ', end='')
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print('')
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# if this is an IO instruction, switch to waiting state
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# and add an io completion in the future
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if instruction_to_execute == DO_IO:
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self.move_to_wait(STATE_RUNNING)
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self.io_finish_times[self.curr_proc].append(clock_tick + self.io_length)
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if self.process_switch_behavior == SCHED_SWITCH_ON_IO:
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self.next_proc()
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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 (cpu_busy, io_busy, 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('-P', '--program', default='', help='more specific controls over programs', action='store', type='string', dest='program')
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parser.add_option('-l', '--processlist', default='', 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 IO', action='store', type='string', dest='process_list')
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parser.add_option('-L', '--iolength', default=5, help='how long an IO takes', action='store', type='int', dest='io_length')
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parser.add_option('-o', '--interrupt_overhead', default=5, help='how long an interrupt processing takes', action='store', type='int', dest='interrupt_overhead')
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parser.add_option('-S', '--switch', default='SWITCH_ON_IO', help='when to switch between processes: SWITCH_ON_IO, SWITCH_ON_END', action='store', type='string', dest='process_switch_behavior')
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parser.add_option('-I', '--iodone', default='IO_RUN_LATER', help='type of behavior when IO ends: IO_RUN_LATER, IO_RUN_IMMEDIATE', action='store', type='string', dest='io_done_behavior')
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parser.add_option('-c', help='compute answers for me', action='store_true', default=False, dest='solve')
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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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assert(options.process_switch_behavior == SCHED_SWITCH_ON_IO or options.process_switch_behavior == SCHED_SWITCH_ON_END)
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assert(options.io_done_behavior == IO_RUN_IMMEDIATE or options.io_done_behavior == IO_RUN_LATER)
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s = scheduler(options.process_switch_behavior, options.io_done_behavior, options.io_length, options.interrupt_overhead)
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if options.program != '':
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for p in options.program.split(':'):
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s.load_program(p)
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else:
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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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if options.solve == False:
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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', end='')
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if options.process_switch_behavior == SCHED_SWITCH_ON_IO:
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print('the current process is FINISHED or ISSUES AN IO')
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else:
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print('the current process is FINISHED')
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print(' After IOs, the process issuing the IO will', end='')
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if options.io_done_behavior == IO_RUN_IMMEDIATE:
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print('run IMMEDIATELY')
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else:
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print('run LATER (when it is its turn)')
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print('')
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exit(0)
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(cpu_busy, io_busy, 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('Stats: CPU Busy %d (%.2f%%)' % (cpu_busy, 100.0 * float(cpu_busy)/clock_tick))
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print('Stats: IO Busy %d (%.2f%%)' % (io_busy, 100.0 * float(io_busy)/clock_tick))
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print('')
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