BeautifulSoup 的 Python 高内存使用率 [英] Python high memory usage with BeautifulSoup

问题描述

我试图在 python 2.7.3 中使用 BeautifulSoup4 处理几个网页，但每次解析后内存使用量都会增加.

I was trying to process several web pages with BeautifulSoup4 in python 2.7.3 but after every parse the memory usage goes up and up.

这个简化的代码产生了相同的行为:

This simplified code produces the same behavior:

from bs4 import BeautifulSoup

def parse():
    f = open("index.html", "r")
    page = BeautifulSoup(f.read(), "lxml")
    f.close()

while True:
    parse()
    raw_input()

在调用 parse() 5 次后，python 进程已经使用了 30 MB 的内存(使用的 HTML 文件大约为 100 kB)并且每次调用都会增加 4 MB.有没有办法释放内存或某种解决方法?

After calling parse() for five times the python process already uses 30 MB of memory (used HTML file was around 100 kB) and it goes up by 4 MB every call. Is there a way to free that memory or some kind of workaround?

更新:这种行为让我很头疼.即使应该长时间删除 BeautifulSoup 变量，此代码也很容易占用大量内存:

Update: This behavior gives me headaches. This code easily uses up plenty of memory even though the BeautifulSoup variable should be long deleted:

from bs4 import BeautifulSoup
import threading, httplib, gc

class pageThread(threading.Thread):
    def run(self):
        con = httplib.HTTPConnection("stackoverflow.com")
        con.request("GET", "/")
        res = con.getresponse()
        if res.status == 200:
            page = BeautifulSoup(res.read(), "lxml")
        con.close()

def load():
    t = list()
    for i in range(5):
        t.append(pageThread())
        t[i].start()
    for thread in t:
        thread.join()

while not raw_input("load? "):
    gc.collect()
    load()

这可能是某种错误吗?

推荐答案

Try Beautiful Soup 的 分解 功能，当您处理完每个文件时，它会破坏树.

Try Beautiful Soup's decompose functionality, which destroys the tree, when you're done working with each file.

from bs4 import BeautifulSoup

def parse():
    f = open("index.html", "r")
    page = BeautifulSoup(f.read(), "lxml")
    # page extraction goes here
    page.decompose()
    f.close()

while True:
    parse()
    raw_input()

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