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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...它前后的 chunk 是否也是空闲的, 如果是的话,ptmalloc会首先把它们合并为一个大的 chunk, 然后将合并后的 chunk 放到 unstored bin 中。 另外ptmalloc 为了提高分配的速度,会把一些小的(不大于64B) chunk先放到一个叫做 fast bins 的容器内。
...
Download File to server from URL
...assing a stream-handle as the $data parameter:
file_put_contents("Tmpfile.zip", fopen("http://someurl/file.zip", 'r'));
From the manual:
If data [that is the second argument] is a stream resource, the remaining buffer of that stream will be copied to the specified file. This is similar with u...
How to iterate over rows in a DataFrame in Pandas
...data
result = [f(x) for x in df['col']]
# Iterating over two columns, use `zip`
result = [f(x, y) for x, y in zip(df['col1'], df['col2'])]
# Iterating over multiple columns - same data type
result = [f(row[0], ..., row[n]) for row in df[['col1', ...,'coln']].to_numpy()]
# Iterating over multiple col...
How to gzip all files in all sub-directories into one compressed file in bash
This post describes how to gzip each file individually within a directory structure. However, I need to do something slightly different. I need to produce one big gzip file for all files under a certain directory. I also need to be able to specify the output filename for the compressed file (e.g., ...
How to remove specific element from an array using python
...
The sane way to do this is to use zip() and a List Comprehension / Generator Expression:
filtered = (
(email, other)
for email, other in zip(emails, other_list)
if email == 'something@something.com')
new_emails, new_other_list = zi...
How to re-sign the ipa file?
...
CERTIFICATE="Name of certificate: To sign with" # must be in keychain
# unzip the ipa
unzip -q "$IPA"
# remove the signature
rm -rf Payload/*.app/_CodeSignature
# replace the provision
cp "$PROVISION" Payload/*.app/embedded.mobileprovision
# sign with the new certificate (--resource-rules has been ...
2016年最适合小投资的10个创业项目 - 资讯 - 清泛网 - 专注C/C++及内核技术
...装店肯定有市场。
开喜糖包装店经营提醒：开动脑筋，把喜糖的范围扩大。比如：洞房之喜、乔迁之喜、荣升之喜、金榜之喜、得子之喜、评职称、孩子考上托福出国等等。这些都是值得庆贺的喜事。人家买包喜糖与朋友分享...
Extract filename and extension in Bash
...the file type. Consider if you had a game called dinosaurs.in.tar and you gzipped it to dinosaurs.in.tar.gz :)
– porges
Jun 13 '09 at 9:11
11
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Linux C/C++程序常用的调试手段及异常排查总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...先对开发过程中可能遇到的问题进行一个总结，大概可以把问题分为以下几类：必现的程序逻辑错误概率性错误进
痛并快乐着
今天讲讲C/C++程序的常用调试手段，介绍调试手段之前，我会首先对开发过程中可能遇到的...
Filtering a list based on a list of booleans
...0 loops, best of 3: 2.58 us per loop
>>> %timeit [i for (i, v) in zip(list_a, fil) if v] #winner
100000 loops, best of 3: 1.98 us per loop
>>> list_a = [1, 2, 4, 6]*100
>>> fil = [True, False, True, False]*100
>>> %timeit list(compress(list_a, fil)) ...