np.fromfile 文件大小的最大限制? [英] Max limit for file size with np.fromfile?

问题描述

np.fromfile() 是否有最大文件大小?我正在尝试读取一个 48GB 的​​文件，大约有 2.1e9 条记录(每条记录有 5 个值).

If there a max file size for np.fromfile()? I'm trying to read a 48GB file, with about 2.1e9 records (each record has 5 values).

当我将计数限制为 8e7 时它有效:

It works when I limit the count to 8e7:

fromfile(filename, dtp, int(8e7))
Out[69]: 
array([(1, 244025.0, 1.1666666269302368, 360.1666564941406, 50.0),
       (2, 244025.0, 1.1666666269302368, 360.5, 50.0),
       (3, 244025.0, 1.1666666269302368, 360.8333435058594, 50.0), ...,
       (255138, 244131.0, 1128.9346923828125, 461.38494873046875, 49.5),
       (255139, 244131.0, 1143.77783203125, 473.2532958984375, 49.5),
       (255140, 244131.0, 1150.4803466796875, 464.6799011230469, 49.5)], 
      dtype=[('ntrac', '<i4'), ('ints', '<f8'), ('x', '<f4'), ('y', '<f4'), ('z', '<f4')]) 

但是当计数设置为 9e7 时，所有值都被读取为零:

But all values are read as zeros when the count is set to 9e7:

In [70]: fromfile(filename, dtp, int(9e7))
Out[70]: 
array([(0, 0.0, 0.0, 0.0, 0.0), (0, 0.0, 0.0, 0.0, 0.0),
       (0, 0.0, 0.0, 0.0, 0.0), ..., (0, 0.0, 0.0, 0.0, 0.0),
       (0, 0.0, 0.0, 0.0, 0.0), (0, 0.0, 0.0, 0.0, 0.0)], 
      dtype=[('ntrac', '<i4'), ('ints', '<f8'), ('x', '<f4'), ('y', '<f4'), ('z', '<f4')])

推荐答案

看来确实是 Mac OS X 的 bug.

It looks like it is indeed a bug with Mac OS X.

在 numpy 中看到以下错误:https://github.com/numpy/numpy/issues/2806

See the following bug in numpy: https://github.com/numpy/numpy/issues/2806

我在分支的分支中有一个建议的修复程序，可以帮助某人进行验证，请参阅:https://github.com/sauliusl/numpy/tree/bug_large_save

I have a proposed fix in my fork of the branch, would help for someone to verify it, see: https://github.com/sauliusl/numpy/tree/bug_large_save

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