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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...
Converting an int to a binary string representation in Java?
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There is also the java.lang.Integer.toString(int i, int base) method, which would be more appropriate if your code might one day handle bases other than 2 (binary).
share
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improv...
How to set a Header field on POST a form?
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Yes you can serialize files into Base64 strings, perhaps very clumsy for huge files since Base64 can be quite bulky. But so is every serialization method.
– Felype
Jul 31 '15 at 17:13
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What is the difference between related SQLite data-types like INT, INTEGER, SMALLINT and TINYINT?
...d as text. Data types are coerced/converted into various storage locations based on affinities (ala data types assigned to columns).
The best thing that I'd recommend you do is to :
Temporarily forget everything you used to know about standalone database datatypes
Read the above link from the SQL...
Location of my.cnf file on macOS
...you start the server using the mysqld_safe program, mysqld_safe sets it to BASEDIR, the MySQL base installation directory.
file specified with --defaults-extra-file=path if any
~/.my.cnf - User-specific
~/.mylogin.cnf - User-specific (clients only)
Source: Using Option Files.
Note: On Unix pl...
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...
Team city unmet requirement: MSBuildTools12.0_x86_Path exists
....net 4.5 web install. I've also copied over the files from my x64 machine based on this article so that I didn't need to install vs2012 (though, I did have the change the path to remove x86 on the 32bit machine):
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SQL Server Installation - What is the Installation Media Folder?
... that one when you "Browse for SQL server Installation Media"
SQLEXPRADV_x64_ENU.exe > SQLEXPRADV_x64_ENU.zip
7zip will open it (standard Windows zip doesn't work though)
Extract to something like C:\SQLInstallMedia
You will get folders like 1033_enu_lp, resources, x64 and a bunch of files.
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Error when installing windows SDK 7.1
...icrosoft Visual C++ 2010 x86 Redistributable
Microsoft Visual C++ 2010 x64 Redistributable
After uninstalling the Microsoft Visual C++ 2010
Redistributable products, you may install the Windows 7 SDK. After
installing the Windows 7 SDK, you may then reinstall the newer version
of t...
Batch script: how to check for admin rights
...independently confirmed that this works on:
Windows XP, x86
Windows XP, x64
Windows Vista, x86
Windows Vista, x64
Windows 7, x86
Windows 7, x64
Windows 8, x86
Windows 8, x64
Windows 10 v1909, x64
(see screenshot #2)
Implementation / Usage
So, to use this solution, simply do something lik...