大约有 23,000 项符合查询结果（耗时：0.0310秒） [XML]
Copy a file in a sane, safe and efficient way
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64
With C++17 the standard way to copy a file will be including the <filesystem> header and ...
What is an SSTable?
...ed in the form of SSTables.
SSTable (directly mapped to GFS) is key-value based immutable storage. It stores chunks of data, each is of 64KB.
Definitions:
Index of the keys: key and starting location
Chunk is a storage unit in GFS, replica management are by chunk
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How does RegexOptions.Compiled work?
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1) Base Class Library Team on compiled regex
2) Coding Horror, referencing #1 with some good points on the tradeoffs
share
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How can I pad an int with leading zeros when using cout
... formatting information below.
//
// Print the number "n" in the given "base"
// using exactly "numDigits".
// Print +/- if signed flag "isSigned" is TRUE.
// Use the character specified in "padchar" to pad extra characters.
//
// Examples:
// sprintfNum(pszBuffer, 6, 10, 6, TRUE,...
Increasing (or decreasing) the memory available to R processes
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64
From:
http://gking.harvard.edu/zelig/docs/How_do_I2.html (mirror)
Windows users may get t...
How to make/get a multi size .ico file? [closed]
...ick in front of any commands.
magick convert icon-16.png icon-32.png icon-64.png icon-128.png icon.ico
See also http://www.imagemagick.org/Usage/thumbnails/#favicon, that has the example:
magick convert image.png -bordercolor white -border 0 \
\( -clone 0 -resize 16x16 \) \
\...
Can I install Python windows packages into virtualenvs?
... I tried to do this, but got an error wheel convert numpy-MKL-1.8.1.win-amd64-py2.7.exe then pip install numpy-1.8.1-cp27-none-win_amd64.whl i get the following error Downloading/unpacking numpy-1.8.1-cp27-none-win-amd64.whl Could not find any downloads that satisfy the requirement numpy-1.8.1-cp...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...glibc malloc版本。
ptmalloc原理
系统调用接口
上图是 x86_64 下 Linux 进程的默认地址空间, 对 heap 的操作, 操作系统提供了brk()系统调用，设置了Heap的上边界； 对 mmap 映射区域的操作,操作系 统 供了 mmap()和 munmap()函数。
因为系统...
Suppress Scientific Notation in Numpy When Creating Array From Nested List
... numbers:
print(a) #prints [0.000010 22.000000 1234567799999999979944197226496.000000]
We've force-suppressed the exponential notation, but it is not rounded or justified, so specify extra formatting options:
np.set_printoptions(suppress=True,
formatter={'float_kind':'{:0.2f}'.format}) #flo...
How can I get a file's size in C++? [duplicate]
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Based on @jterm suggestion, opening the stream would be std::ifstream in(filename, std::ios::binary | std::ios::ate); Just to ease everybody's life ;)
– jmpcm
Nov 18 '14 at 11:41
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