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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...alloc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。
因为系统调用...
Add single element to array in numpy
...2 s ± 16.1 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
Using python list converting to array afterward:
d = [0]
for k in range(int(10e4)):
d.append(k)
f = np.array(d)
13.5 ms ± 277 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
Pre-allocating numpy array:
e = np.ze...
A free tool to check C/C++ source code against a set of coding standards? [closed]
...
Try nsiqcppstyle. It's a Python based coding style checker for C/C++. It's easy to extend to add your own rules.
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How do you crash a JVM?
... Confirmed working using getDeclaredField trick in JDK 8u131 on Linux x64, including production of hs_err_pid*.log from a SIGSEGV.
– Jesse Glick
Aug 18 '17 at 13:00
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Can Flask have optional URL parameters?
...able with the defaults in the function head - the way you are used to with python:
@app.route('/<user_id>')
@app.route('/<user_id>/<username>')
def show(user_id, username='Anonymous'):
return user_id + ':' + username
...
How can I automate the “generate scripts” task in SQL Server Management Studio 2008?
...p which allows you to generate SQL server scripts from the command line in Linux. All you need is .Net Core 2 preview: github.com/mkurz/SQLServerScripter
– mkurz
Aug 1 '17 at 17:11
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Rsync copy directory contents but not directory itself
...d only to rsync, but when you are looking for examples on how to use a GNU/Linux command, you can use "eg" which displays explicit examples.
eg is available here, with instructions on how to install it: https://github.com/srsudar/eg
The result for eg rsync is as follow
# rsync
copy the folder so...
Difference between \n and \r?
...y nasty experience with that just because I forgot about the \r (I'm using Linux). Once I started parsing what seemed to be a valid file my parser failed because the file I was parsing has been created in Windows. :D The main problem in all that is that neither \n or \r are visible in the sense that...
How to import a .cer certificate into a java keystore?
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on MacOS /Linux this command works with sudo. Thanks. but what is noprompt param ? I didn't use it and still succeeded.
– Evgeniy Mishustin
Jun 7 '17 at 8:52
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What is the size of column of int(11) in mysql in bytes?
...---+------------+-------+
This answer is tested against MySQL 5.7.12 for Linux and may or may not vary for other implementations.
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