Question

如何更改此代码以使每列执行6次而不是3次？

例如，如果p1有11条指令，而p2有5条指令需要执行，则此代码将使p1执行3次，然后将其放在行的末尾并从p2执行3条指令。相反，我希望它一次只执行6条指令，而不是3条。如果p1有11条指令，我希望在第一个队列中执行6条指令，而不是3条。

import queue
import random

# Function to open the file using exception handling
def openFile():
    goodFile = False
    while goodFile == False:
        fname = input("Enter name of data file: ")
        try:
            inFile = open(fname, 'r')
            goodFile = True
        except IOError:
            print("Invalid filename, please try again ... ")
    return inFile

# Function to get the time slice value and the processes from the file into the queue
# Queue will contain a string with process ID and exec time separated by a comma

def getProcs(cpuQ):
    infile = openFile()

    # Get the first line in the file containing the time slice value
    line = infile.readline()

    # Strip the \n from the line and convert to an integer
    tslice = int(line.strip())

    # Loop through the file inserting processes into the queue
    for line in infile:                             
        proc = line.strip()
        cpuQ.put(proc)
    infile.close()
    return tslice, cpuQ

# Function to print the contents of the queue

def printQueue(tslice, cpuQ):
    print("The time slice is ",tslice, " \n The contents of the queue are: ")
    for i in range(cpuQ.qsize()):
        proc = cpuQ.get()
        cpuQ.put(proc)
        print(proc)


# Function to execute the processes in the queue

def scheduleProcs(tslice, cpuQ):
    # While the queue is not empty
    while (cpuQ.empty() != True):

        # Get next process from queue
        proc = cpuQ.get()

        # Separate the process ID and the execution time from the process info
        PID, exectime = proc.split(",")

        # Convert exectime to an integer
        exectime = int(exectime)

        print("Getting next process - Process ", PID," has ", exectime," instructions to execute")

        # Initialize the timer
        timer = 0

        # While proc still has time in slice and still has code to execute
        while (timer < tslice) and (exectime > 0):

            # In a real computer, the OS would take an instruction from process out of memory and   execute it
            # Execute an instruction of process
            exectime = exectime - 1

            # Count one tick of the timer
            timer = timer + 1                       
            print("Executing instruction ", exectime," of process ", PID,".  Timer = ", timer)

        # If proc still has instructions to execute put it back in the queue
        if (exectime > 0):

            # Create string with new exec time and process ID
            proc = PID + "," + str(exectime)

            # Put the process back in the queue
            cpuQ.put(proc)

            print("Put process ", PID," back in queue with ", exectime," instructions left to execute")
        else:
            print("*** Process ", PID, " Complete ***")
    return


# Main function

def main():
    # Create the scheduling queue
    cpuQ = queue.Queue()

    # Get the processes from the data file
    tslice, cpuQ = getProcs(cpuQ)

    # Print the queue
    printQueue(tslice, cpuQ)

    # Schedule the processes
    scheduleProcs(tslice, cpuQ)

main()

在线程之间共享时间片

0 个答案: