Os Memory Memory Leak

In this tutorial, you'll learn about How to Fix Memory Leak Errors. We cover key concepts, practical examples, and best practices.

Fix memory leak errors when object references never released causing unbounded memory growth.

Quick Fix

Wrong

cache={}
def process(req):
    cache[req.id]=req  # never removed! Leak.

Cache grows unbounded. Each request adds entry. Eventually OOM.

Right

from collections import OrderedDict
class LRUCache:
    def __init__(self,cap):
        self.cache=OrderedDict(); self.cap=cap
    def get(self,key):
        if key not in self.cache: return None
        self.cache.move_to_end(key); return self.cache[key]
    def put(self,key,val):
        self.cache[key]=val; self.cache.move_to_end(key)
        if len(self.cache)>self.cap: self.cache.popitem(last=False)
cache=LRUCache(1000)
def process(req):
    cache.put(req.id, req)
    return cache.get(req.id)

LRU cache evicts old entries when capacity exceeded. Bounded memory.

Prevention

Use bounded caches (LRU, TTL). WeakValueDictionary for optional caching. Profile with tracemalloc.

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