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Why is creating a Thread said to be expensive?
...tem calls need to be made to create / register the native thread with the host OS.
Descriptors need to be created, initialized and added to JVM-internal data structures.
It is also expensive in the sense that the thread ties down resources as long as it is alive; e.g. the thread stack, any objects...
How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?
...the bitness of this JVM with:
System.getProperty("sun.arch.data.model");
Possible results are:
"32" – 32-bit JVM
"64" – 64-bit JVM
"unknown" – Unknown JVM
As described in the HotSpot FAQ:
When writing Java code, how do I distinguish between 32 and 64-bit operation?
There's no public API th...
How to create full compressed tar file using Python?
... a .tar.gz (aka .tgz) for an entire directory tree:
import tarfile
import os.path
def make_tarfile(output_filename, source_dir):
with tarfile.open(output_filename, "w:gz") as tar:
tar.add(source_dir, arcname=os.path.basename(source_dir))
This will create a gzipped tar archive contain...
How to get current CPU and RAM usage in Python?
...e ps, top and Windows task manager.
It currently supports Linux, Windows, OSX, Sun Solaris, FreeBSD, OpenBSD and NetBSD, both 32-bit and 64-bit architectures, with Python versions from 2.6 to 3.5 (users of Python 2.4 and 2.5 may use 2.1.3 version).
Some examples:
#!/usr/bin/env python
import psut...
App Inventor 2 字典 vs 列表：同样存数据，性能差了10倍？ - App应用开发 ...
...？</b></font><br><br><br>在做 App 开发时，你可能会遇到这样一个场景：要存储一组学生信息，包含姓名、年龄、班级，然后需要快速根据姓名查到对应的班级。用列表也能实现，用字典也能实现——那到底该用哪个？<br><br>今天我们...
How can I install Apache Ant on Mac OS X?
...
Ant is already installed on some older versions of Mac OS X, so you should run ant -version to test if it is installed before attempting to install it.
If it is not already installed, then your best bet is to install Homebrew (brew install ant) or MacPorts (sudo port install ap...
How can I change Mac OS's default Java VM returned from /usr/libexec/java_home
...dkhome="`/usr/libexec/java_home -v '1.7*'`"
and this will force it to choose Java 7 instead of 8.
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Memcached下一站：HandlerSocket！ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，所以就报错了，既然知道了原因，那我们就照猫画虎做一个VERSION文件放到MySQL源代码目录，内容如下：
MYSQL_VERSION_MAJOR=5
MYSQL_VERSION_MINOR=1
MYSQL_VERSION_PATCH=37
MYSQL_VERSION_EXTRA=
再次运行configure脚本，应该就OK了，把剩下的步骤...
php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
说明：
mixed json_decode ( string $json [, bool $assoc ] )
接受一个 JSON 格式的字符串并且把它转换为 PHP 变量
参数：
json
待解码的 json string 格式的字符串。
assoc
当该参数为 TRUE 时，将返回 array 而非 object 。
返回值：
Retu...
How do you normalize a file path in Bash?
...
For those of you what need a OS X solution, check out Adam Liss' answer below.
– Trenton
May 22 '16 at 6:16
...