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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...：
shell> sysctl vm.drop_caches=1
平时可以通过mongo命令行来监控MongoDB的内存使用情况，如下所示：
mongo> db.serverStatus().mem:
{
"resident" : 22346,
"virtual" : 1938524,
"mapped" : 962283
}
还可以通过mongostat命令来监控MongoDB的内存使...
Live-stream video from one android phone to another over WiFi
...sample code for the server:
// this is your network socket
ParcelFileDescriptor pfd = ParcelFileDescriptor.fromSocket(socket);
mCamera = getCameraInstance();
mMediaRecorder = new MediaRecorder();
mCamera.unlock();
mMediaRecorder.setCamera(mCamera);
mMediaRecorder.setAudioSource(MediaRecorder.AudioS...
Using ping in c#
...ply reply = pinger.Send(nameOrAddress);
pingable = reply.Status == IPStatus.Success;
}
catch (PingException)
{
// Discard PingExceptions and return false;
}
finally
{
if (pinger != null)
{
pinger.Dispose();
}
}
retu...
MongoDB与内存 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...：
shell> sysctl vm.drop_caches=1
平时可以通过mongo命令行来监控MongoDB的内存使用情况，如下所示：
mongo> db.serverStatus().mem:
{
"resident" : 22346,
"virtual" : 1938524,
"mapped" : 962283
}
还可以通过mongostat命令来监控MongoDB的内存使...
Simplest way to detect a mobile device in PHP
...
Here is a source:
Detect Mobile Browser
Download PHP script
Code:
<?php
$useragent=$_SERVER['HTTP_USER_AGENT'];
if(preg_match('/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|n...
java.net.UnknownHostException: Invalid hostname for server: local
...hostname "localhost" instead, or perhaps 127.0.0.1 or ::1 (the last one is IPv6).
From the javadocs:
Thrown to indicate that the IP address
of a host could not be determined.
127.0.0.1or ::1 or "localhost" should always be the loopback interface, so if that doesn't work I'd be really surpri...
Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...则基于广受人民群众爱戴的Cocoa和Cocoa Touch框架，展示了软件开发的新方向。
Swift已经存在了多年。Apple基于已有的编译器、调试器、框架作为其基础架构。通过ARC(Automatic Reference Counting，自动引用计数)来简化内存管理。我们的...
Best practices when running Node.js with port 80 (Ubuntu / Linode) [closed]
...cloud instances is I redirect port 80 to port 3000 with this command:
sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3000
Then I launch my Node.js on port 3000. Requests to port 80 will get mapped to port 3000.
You should also edit your /etc/rc.local file and add...
How do I update Ruby Gems from behind a Proxy (ISA-NTLM)
... Nov 15 '10 at 17:45
Peter MoresiPeter Moresi
2,32911 gold badge1212 silver badges44 bronze badges
...
Remote debugging with Android emulator
...to killall adb too on the server, because the emulator will not accept multiple connections and will be offline for the local machine.
– Henrique de Sousa
Mar 17 '16 at 10:36
...