我正在使用python多处理库来实时处理大数据集。
有时我需要重新启动更改某些设置的过程。
是否有可能清除保存在RAM中的数据。我看到我的RAM使用率正在增长〜2％/重启。
请查看以下代码示例：
# -*- coding: utf-8 -*-
from PyQt4 import QtGui, QtCore
import multiprocessing
import sys
def calc(q):
x=5
for i in range (10):
x = x+1
q.put(x)
def calc_calc(quee, qq):
for u in range (10):
y = quee.get()
z = y*10
qq.put(z)
def calc_end(queee, qqq):
for w in range (10):
h = queee.get()
xy = h*10
print(xy)
qqq.put(xy)
class Window(QtGui.QWidget):
def __init__(self):
QtGui.QWidget.__init__(self)
self.button = QtGui.QPushButton('Test', self)
self.button.clicked.connect(self.handleButton)
layout = QtGui.QVBoxLayout(self)
layout.addWidget(self.button)
def handleButton(self):
p1 = multiprocessing.Process(target=calc, args=(q,))
#q = q.put(x)
p2 = multiprocessing.Process(target=calc_calc, args =(q, qq,))
#qq = qq.put(z)
p3 = multiprocessing.Process(target= calc_end, args =(qq, qqq,))
p1.start()
p2.start()
p3.start()
p1.join()
p2.join()
p3.join()
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
window = Window()
#multiprocessing queue 1
q = multiprocessing.Queue()
#multiprocessing queue 3
qq = multiprocessing.Queue()
#multiprocessing queue 3 (aktuell nicht belegt)
qqq = multiprocessing.Queue()
window.show()
sys.exit(app.exec_())
答案 0 :(得分：0)
您无法明确释放内存。您可以做的是根据Python Documentation使用/*this is my java code which when i compile they don not show exactly error */
public class Login {
public JFrame frame;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Login window = new Login();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
Connection conections;
private JTextField textField;
private JPasswordField passwordField;
public Login() {
initialize();
conections = SqliteConnectio.dbConnection();
}
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 581, 411);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
textField = new JTextField();
textField.setBounds(266, 112, 193, 45);
frame.getContentPane().add(textField);
textField.setColumns(10);
JButton btnLOGIN = new JButton("LOGIN");
Image jn=new ImageIcon(this.getClass().getResource("/Ok.png")).getImage();
btnLOGIN.setIcon(new ImageIcon(jn));
btnLOGIN.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try {
String query = "select *from customer.sqlite where username=? and password=? ";
PreparedStatement pre = conections.prepareStatement(query);
pre.setString(1, textField.getText());
pre.setString(2, passwordField.getText());
ResultSet res = pre.executeQuery();
int count = 0;
while (res.next()) {
count++;
}
if (count == 1) {
JOptionPane.showInternalMessageDialog(null, "username and password has sucseeful inserted");
} else if (count > 1) {JOptionPane.showInternalMessageDialog(null, "username and password has sucseeful inserted");
}
else {
JOptionPane.showInternalMessageDialog(null, "username and password has been failed to be entered");
}
res.close();
pre.close();
} catch (Exception e) {
JOptionPane.showInternalMessageDialog(null, "you have failed to asses the database");
}
}
});
btnLOGIN.setBounds(321, 256, 125, 36);
frame.getContentPane().add(btnLOGIN);
JLabel userNAME = new JLabel("USERNAME");
userNAME.setBounds(156, 127, 85, 14);
frame.getContentPane().add(userNAME);
JLabel passLABEL = new JLabel("PASSWORD");
passLABEL.setBounds(156, 191, 85, 14);
frame.getContentPane().add(passLABEL);
passwordField = new JPasswordField();
passwordField.setBounds(266, 188, 193, 20);
frame.getContentPane().add(passwordField);
JLabel lblNewLabel = new JLabel("New label");
Image im=new ImageIcon(this.getClass().getResource("/login.png")).getImage();
lblNewLabel.setIcon(new ImageIcon(im));
lblNewLabel.setBounds(10, 21, 136, 205);
frame.getContentPane().add(lblNewLabel);
}
}
调用垃圾收集器。