The first great thing about htop is that it will show you your usage per CPU, as well as a meaningful text graph of your memory and swap usage right at the top. I find this much easier to understand at a glance than the default output from top. Installing htop on Ubuntu Installing on [...]

It is recommended to use a separate partition for container’s private directories (by default /vz/private/<veid>). The reason why you should do so is that if you wish to use OpenVZ per-container disk quota, you won’t be able to use usual Linux disk quotas on the same partition. Bear in mind, that per-container quota in this [...]

When you first start memcached, the memory that you have configured is not automatically allocated. Instead,memcached only starts allocating and reserving physical memory once you start saving information into the cache. When you start to store data into the cache, memcached does not allocate the memory for the data on an item by item basis. Instead, a [...]

sounds quite strange, a VNC client for the iPhone. But incredible it works! I’ve used the Mocha VNC client because it is compatible with all known VNC server solutions. There are also other VNC clients available, but as far as I know they are not working together with all VNC server solutions. I’ve tested the VNC [...]

Apache needs a lot of memory, this will decrease performance on a machine with e.g. 1 GByte memory and about 60 users accessing the server simultaneously a lot. There is a simply method to save memory:disable all unused modules. Yes, it really helps! Why does it help? Because every apache process started – and a [...]

If you use Dumpchk.exe from the Service Pack 3 CD, you can determine all of the information that is mentioned earlier and the address of the driver that generated the stop message. This information can often give you a direction to begin troubleshooting. Before you run Dumpchk.exe, be sure to adjust the properties of the [...]

Now you can download the latest Apple Safari 4 web browser. Launching its latest beta version, Apple calls it the world’s fastest web browser for Mac and Windows computers. Apple Safari 4 powered by the new Nitro JavaScript engine claims to execute JavaScript 30 times faster than IE 7 and 3 times faster than Firefox 3; it loads HTML web [...]

Data Execution Prevention (DEP) is a Windows Vista security feature that can help prevent damage to your computer from viruses and other security threats by monitoring your programs to make sure that they use system memory safely. If DEP notices a program on your computer using memory incorrectly, it closes the program and notifies you. [...]

Google is normally quite secretive about their search infrastructure but, in a break from tradition, they have revealed that a single search query on Google can consume the processing power of 1000 machines. Google Fellow Jeff Dean, in a keynote talk at WSDM 2009, shared some numbers about Google’s impressive growth run from 1999 to [...]

It is a recommended practice to backup the configuration of the PIX Firewall for use in emergencies or for disaster recovery. But, the PIX does not support an external Flash card. The internal Flash does not support the backup of the configuration file. The configuration file must be saved externally The PIX configuration file can [...]

Command Summary Use arp Command mostly used for checking existing Ethernet connectivity and IP address Most common use: arp This command should be used in conjunction with the ifconfig and route commands. It is mostly useful for me to check a network card and get the IP address quick. Obviously there are many more parameters, [...]