我正在编写一个自定义文件系统爬虫,它通过 sys.stdin 传递数百万个 glob 来处理。我发现在运行脚本时,它的内存使用量会随着时间的推移而大幅增加,整个过程几乎停止了。我在下面写了一个显示问题的最小案例。我做错了什么,还是我在 Python / glob 模块中发现了一个错误?(我使用的是 python 2.5.2)。
#!/usr/bin/env python
import glob
import sys
import gc
previous_num_objects = 0
for count, line in enumerate(sys.stdin):
glob_result = glob.glob(line.rstrip('\n'))
current_num_objects = len(gc.get_objects())
new_objects = current_num_objects - previous_num_objects
print "(%d) This: %d, New: %d, Garbage: %d, Collection Counts: %s"\
% (count, current_num_objects, new_objects, len(gc.garbage), gc.get_count())
previous_num_objects = current_num_objects
输出如下所示:
(0) 这:4042,新:4042,Python 垃圾:0,Python 收集计数:(660, 5, 0) (1) This: 4061, New: 19, Python Garbage: 0, Python Collection Counts: (90, 6, 0) (2) This: 4064, New: 3, Python Garbage: 0, Python Collection Counts: (127, 6, 0) (3) This: 4067, New: 3, Python Garbage: 0, Python Collection Counts: (130, 6, 0) (4) This: 4070, New: 3, Python Garbage: 0, Python Collection Counts: (133, 6, 0) (5) This: 4073, New: 3, Python Garbage: 0, Python Collection Counts: (136, 6, 0) (6) This: 4076, New: 3, Python Garbage: 0, Python Collection Counts: (139, 6, 0) (7) This: 4079, New: 3, Python Garbage: 0, Python Collection Counts: (142, 6, 0) (8) This: 4082, New: 3, Python Garbage: 0, Python Collection Counts: (145, 6, 0) (9) This: 4085, New: 3, Python Garbage: 0, Python Collection Counts: (148, 6, 0)
每 100 次迭代,就有 100 个对象被释放,因此len(gc.get_objects()
每 100 次迭代增加 200 个对象。len(gc.garbage)
永远不会从 0 开始变化。第 2 代收集计数缓慢增加,而第 0 和第 1 代计数上升和下降。