python中的tracemalloc如何使用
时间: 2024-02-28 20:53:52 浏览: 27
使用 `tracemalloc` 模块可以跟踪 Python 程序的内存分配情况,从而帮助定位内存泄漏问题。以下是使用 `tracemalloc` 模块的基本步骤:
1. 导入 `tracemalloc` 模块:
```python
import tracemalloc
```
2. 开始跟踪内存分配情况:
```python
tracemalloc.start()
```
3. 执行需要跟踪的代码逻辑。
4. 获取跟踪结果:
```python
snapshot = tracemalloc.take_snapshot()
```
5. 分析跟踪结果:
```python
top_stats = snapshot.statistics('lineno')
print("[ Top 10 ]")
for stat in top_stats[:10]:
print(stat)
```
完整示例代码:
```python
import tracemalloc
# 开始跟踪内存分配情况
tracemalloc.start()
# 执行需要跟踪的代码逻辑
lst = [i for i in range(100000)]
# 获取跟踪结果
snapshot = tracemalloc.take_snapshot()
# 分析跟踪结果
top_stats = snapshot.statistics('lineno')
print("[ Top 10 ]")
for stat in top_stats[:10]:
print(stat)
```
输出结果类似于:
```
[ Top 10 ]
/home/user/test.py:4: size=462 KiB, count=100001, average=4 B
/usr/lib/python3.6/random.py:174: size=6.0 KiB, count=97, average=64 B
/usr/lib/python3.6/linecache.py:137: size=3.9 KiB, count=65, average=62 B
/usr/lib/python3.6/linecache.py:29: size=3.9 KiB, count=65, average=62 B
/usr/lib/python3.6/ast.py:23: size=3.8 KiB, count=101, average=38 B
/usr/lib/python3.6/ast.py:384: size=2.7 KiB, count=34, average=80 B
/usr/lib/python3.6/site-packages/numpy/lib/type_check.py:341: size=1.5 KiB, count=5, average=312 B
/usr/lib/python3.6/site-packages/numpy/core/_methods.py:28: size=1.3 KiB, count=2, average=664 B
/usr/lib/python3.6/ast.py:386: size=1.2 KiB, count=17, average=72 B
/usr/lib/python3.6/tokenize.py:195: size=1.2 KiB, count=3, average=424 B
```
通过分析跟踪结果,可以定位到代码中的内存分配情况,并进一步判断是否存在内存泄漏问题。
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