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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...
App Inventor 2 与 Mixly（米思齐）MixIO 平台数据通信方案完整调研 - 创客...
...非常重要的图形化编程平台。很多老师和学习者都在问同一个问题：这两个平台之间能不能做数据通信？能不能让 AI2 的 App 和 Mixly 的硬件项目互相传递数据？答案是：可以，而且有多种方案。本文将完整介绍四种对接方案的技...
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...
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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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...案自然就清楚了。
据说带着问题学习更有效，那就先看一个MongoDB服务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
...
MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...案自然就清楚了。
据说带着问题学习更有效，那就先看一个MongoDB服务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
...
MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...案自然就清楚了。
据说带着问题学习更有效，那就先看一个MongoDB服务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
...
MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...案自然就清楚了。
据说带着问题学习更有效，那就先看一个MongoDB服务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
...