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Could not reserve enough space for object heap
...b)->Environment Variables->System
Variables->New: Variable name: _JAVA_OPTIONS
Variable value: -Xmx512M
Variable name: Path
Variable value: %PATH%;C:\Program Files\Java\jre6\bin;F:\JDK\bin;
Change this to your appropriate path.
...
top -c command in linux to filter processes listed based on processname
... to get pid's of matching command lines:
top -c -p $(pgrep -d',' -f string_to_match_in_cmd_line)
top -p expects a comma separated list of pids so we use -d',' in pgrep. The -f flag in pgrep makes it match the command line instead of program name.
...
select and update database record with a single queryset
...
Use the queryset object update method:
MyModel.objects.filter(pk=some_value).update(field1='some value')
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What is the difference between Θ(n) and O(n)?
...
one is Big "O"
one is Big Theta
http://en.wikipedia.org/wiki/Big_O_notation
Big O means your algorithm will execute in no more steps than in given expression(n^2)
Big Omega means your algorithm will execute in no fewer steps than in the given expression(n^2)
When both condition are tru...
What is the best project structure for a Python application? [closed]
...Project/
|-- bin/
| |-- project
|
|-- project/
| |-- test/
| | |-- __init__.py
| | |-- test_main.py
| |
| |-- __init__.py
| |-- main.py
|
|-- setup.py
|-- README
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improv...
What is the 'override' keyword in C++ used for? [duplicate]
... : base
{
virtual void foo() override
{
std::cout << __PRETTY_FUNCTION__ << std::endl;
}
};
int main()
{
base* override = new derived();
override->foo();
return 0;
}
Output:
zaufi@gentop /work/tests $ g++ -std=c++11 -o override-test override-test.cc...
Linux环境离线安装docker&docker-compose - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
Linux环境离线安装docker&docker-composelinux_docker_install一、docker离线安装1、下载docker离线安装包下载最新版本的 docker （或者选择自己想要安装的版本）到本地。1）docker下载地址：Docker版本下载 ||Docker-compose版本下载备注...
一、docker...
Fastest way to determine if an integer is between two integers (inclusive) with known sets of values
... operator.
if ((unsigned)(number-lower) <= (upper-lower))
in_range(number);
With a typical, modern computer (i.e., anything using twos complement), the conversion to unsigned is really a nop -- just a change in how the same bits are viewed.
Note that in a typical case, you can pre-...
Capture Image from Camera and Display in Activity
...ass MyCameraActivity extends Activity
{
private static final int CAMERA_REQUEST = 1888;
private ImageView imageView;
private static final int MY_CAMERA_PERMISSION_CODE = 100;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceSta...
How to check whether a string is Base64 encoded or not
... for PHP5
//where $json is some data that can be base64 encoded
$json=some_data;
//this will check whether data is base64 encoded or not
if (base64_decode($json, true) == true)
{
echo "base64 encoded";
}
else
{
echo "not base64 encoded";
}
Use this for PHP7
//$strin...