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srt_py2.7.py
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def SRT(p):
t_cs = 8
t = 0
queue = []
current = []
busy = 0
done = []
num = {}
start_time = 0
end_time = 0
time_left=0
cpu_start_t = 0
ioend_time = {}
time_left_arr = []
tmp = None
io_time_beg=0
num_pre=0
num_processes=0
for x in p:
num[x.id] = x.num_bursts
num_processes+=1
print "time %dms: Simulator started for SRT %s" %(t, printQueue(queue))
if num_processes==1:
while(1):
# if(sum(num.values() == 0)):
# break
for x in p:
if(x.arrival_time == t):
# print "arrived", x.id)
if t == 0:
queue.append(x)
print "time " + str(t) + "ms: Process " + x.id + " arrived and added to ready queue " + printQueue(queue)
else:
tmp = current.pop()
if x.cpu_burst_time < tmp.cpu_burst_time- (t-cpu_start_t) :
time_left = tmp.cpu_burst_time- (t-cpu_start_t)
print "time %dms: Process %s arrived and will preempt %s %s" %(t, x.id, tmp.id, printQueue(queue))
t += t_cs
start_time = t
end_time = start_time + x.cpu_burst_time
ioend_time[x.id] = end_time + 4 + x.io_time
busy = 1
queue.append(tmp)
if time_left > 0:
print "time " + str(t) + "ms: Process " + x.id + " started using the CPU with " + str(time_left) + "ms remaining " + printQueue(queue)
else:
print "time " + str(t) + "ms: Process " + x.id + " started using the CPU " + printQueue(queue)
cpu_start_t = t
current.append(x)
else:
queue.append(x)
print "time " + str(t) + "ms: Process " + x.id + " arrived and added to ready queue " + printQueue(queue)
if(busy == 0):
# print "started using cpu", x.id)
# tmp2 = current.pop()
# print "current", tmp2)
if(queue != []):
t += 4
start_time = t
tmp = queue.pop(0)
end_time = start_time + tmp.cpu_burst_time
ioend_time[tmp.id] = end_time + 4 + tmp.io_time
busy = 1
if time_left > 0:
print "time " + str(t) + "ms: Process " + tmp.id + " started using the CPU with " + str(time_left) + "ms remaining " + printQueue(queue)
else:
print "time " + str(t) + "ms: Process " + tmp.id + " started using the CPU " + printQueue(queue)
current.append(tmp)
cpu_start_t = t
if(time_left+t < t+tmp.arrival_time):
# print "end time change", x.id)
end_time = t+tmp.arrival_time
if(t == end_time):
# print "now is end time", x.id)
busy = 0
if current != []:
tmp = current.pop(0)
# else:
# if q
# tmp = queue.pop(0)
num[tmp.id] -= 1
# print str(end_time)
# print str(time_left)
# print cpu_start_t)
# print "end time"+str(end_time)
if(num[tmp.id] == 0):
# print "time " + str(t) + "ms: FIX-Process " + tmp.id + " terminated " + printQueue(queue)
# current.remove(tmp)
if queue != []:
del queue[0]
t = t+time_left
print "time " + str(t) + "ms: Process " + tmp.id + " terminated " + printQueue(queue)
t +=3
# elif(num[tmp.id] == 1):
elif(num[tmp.id]==1):
print "time " + str(t) + "ms: Process " + tmp.id + " completed a CPU burst; " + str(num[tmp.id]) + " burst to go " + printQueue(queue)
print "time " + str(t) + "ms: Process " + tmp.id + " switching out of CPU; will block on I/O until time " + str(ioend_time[tmp.id]) + "ms " + printQueue(queue)
t += 3
elif(num[tmp.id]>1):
if current != []:
tmp = current.pop()
print "time " + str(t) + "ms: Process " + tmp.id + " completed a CPU burst; " + str(num[tmp.id]) + " bursts to go " + printQueue(queue)
print "time " + str(t) + "ms: Process " + tmp.id + " switching out of CPU; will block on I/O until time " + str(ioend_time[tmp.id]) + "ms " + printQueue(queue)
t += 3
else:
print "done"
for x in p:
if(x.id in ioend_time):
if(t == ioend_time[x.id] and (x not in queue)):
if current != []:
tmp = current.pop()
if x.cpu_burst_time < time_left and t!=end_time :
print "time %dms: Process %s completed I/O and will preempt %s %s" %(t, x.id, tmp.id,printQueue(queue))
t += t_cs
start_time = t
end_time = start_time + x.cpu_burst_time
ioend_time[x.id] = end_time + 4 + x.io_time
busy = 1
# queue.append(tmp)
queue.insert(0,tmp)
time_left = time_left-(t-cpu_start_t)+t_cs
if time_left > 0:
print "time " + str(t) + "ms: Process " + x.id + " started using the CPU with " + str(time_left) + "ms remaining " + printQueue(queue)
else:
print "time " + str(t) + "ms: Process " + x.id + " started using the CPU " + printQueue(queue)
cpu_start_t = t
current.append(x)
else:
queue.append(x)
print "time " + str(t) + "ms: Process " + x.id + " completed I/O; added to ready queue " + printQueue(queue)
t -= 1
t += 1
print "time " + str(t) + "ms: Simulator ended for SRT\n"
else:
while(1):
# if(sum(num.values() == 0)):
# break
''' When processes first arrive'''
for x in p:
if(t ==x.arrival_time):
if t == 0:
queue.append(x)
print "time " + str(t) + "ms: Process " + x.id + " arrived and added to ready queue " + printQueue(queue)
else:
tmp = current.pop()
if x.cpu_burst_time < tmp.cpu_burst_time- (t-cpu_start_t) :
time_left = tmp.cpu_burst_time- (t-cpu_start_t)
time_left_arr.append(time_left)
print "time %dms: Process %s arrived and will preempt %s %s" %(t, x.id, tmp.id, printQueue(queue))
num_pre +=1
t += t_cs
start_time = t
end_time = start_time + x.cpu_burst_time
ioend_time[x.id] = end_time + 4 + x.io_time
busy = 1
queue.append(tmp)
print "time " + str(t) + "ms: Process " + x.id + " started using the CPU " + printQueue(queue)
cpu_start_t = t
current.append(x)
else:
queue.append(x)
print "time " + str(t) + "ms: Process " + x.id + " arrived and added to ready queue " + printQueue(queue)
''' If CPU is not busy, start using CPU'''
if(busy == 0):
if(queue != []):
t += 4
start_time = t
tmp = queue.pop(0)
end_time = start_time + tmp.cpu_burst_time
ioend_time[tmp.id] = end_time + 4 + tmp.io_time
busy = 1
if time_left_arr != []:
time_left = time_left_arr.pop()
if time_left > 0:
print "time " + str(t) + "ms: Process " + tmp.id + " started using the CPU with " + str(time_left) + "ms remaining " + printQueue(queue)
end_time = t+time_left
else:
print "time " + str(t) + "ms: Process " + tmp.id + " started using the CPU " + printQueue(queue)
time_left = tmp.cpu_burst_time
time_left_arr.append(time_left)
current.append(tmp)
cpu_start_t = t
if(t == end_time and (x not in done) and num[tmp.id] >= 0):
busy = 0
if current != []:
tmp = current.pop(0)
num[tmp.id] -= 1
if(num[tmp.id] == 0):
del x
print "time " + str(t) + "ms: Process " + tmp.id + " terminated " + printQueue(queue)
done.append(tmp)
t +=3
time_left = 0
else:
if current != []:
tmp = current.pop()
if num[tmp.id]==1:
print "time " + str(t) + "ms: Process " + tmp.id + " completed a CPU burst; " + str(num[tmp.id]) + " burst to go " + printQueue(queue)
else:
print "time " + str(t) + "ms: Process " + tmp.id + " completed a CPU burst; " + str(num[tmp.id]) + " bursts to go " + printQueue(queue)
ioend_time[x.id] = end_time + 4 + x.io_time
print "time " + str(t) + "ms: Process " + tmp.id + " switching out of CPU; will block on I/O until time " + str(ioend_time[tmp.id]) + "ms " + printQueue(queue)
t += 3
end_time = end_time + 4 + x.io_time
time_left = 0
''' At each io end time'''
for x in p:
if(x.id in ioend_time):
if(t == ioend_time[x.id] and (x not in queue) and (x not in done)):
if current != []:
tmp = current.pop()
if time_left_arr != []:
time_left = time_left_arr.pop()
if time_left+cpu_start_t < ioend_time[x.id]:
busy = 0
num[tmp.id] -= 1
if(num[tmp.id] == 0):
if time_left_arr != []:
time_left = time_left_arr.pop()
t = time_left+cpu_start_t
print "time " + str(t) + "ms: Process " + tmp.id + " terminated " + printQueue(queue)
done.append(tmp)
t +=3
time_left = 0
t +=1
elif(x.cpu_burst_time < time_left and t!=end_time):
print "time %dms: Process %s completed I/O and will preempt %s %s" %(t, x.id, tmp.id,printQueue(queue))
num_pre +=1
t += t_cs
start_time = t
end_time = start_time + x.cpu_burst_time
ioend_time[x.id] = end_time + 4 + x.io_time
busy = 1
queue.insert(0,tmp)
time_left = time_left-(t-cpu_start_t)+t_cs
time_left_arr.append(time_left)
if time_left >0:
print "time " + str(t) + "ms: Process " + x.id + " started using the CPU " + printQueue(queue)
cpu_start_t = t
current.append(x)
else:
queue.append(x)
print "time " + str(t) + "ms: Process " + x.id + " completed I/O; added to ready queue " + printQueue(queue)
end_time = x.cpu_burst_time+t
t -= 1
t += 1
print "time " + str(t) + "ms: Simulator ended for SRT\n"