Archive for 'Performance'

ETAGs vs Expire Headers

When it come to optimization of a site or web-server, ETAGs and Expiry headers are the two main things you should be looking at. ETAGs and Expiry headers will be used to understand by the client whether to fetch the latest file or not, but still there is a difference between these two and are used at different scenarios.

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Zombie Process

It's a pretty much common question asked in most of the interviews related to Linux, and most of the time people got it confused with Orphan Process. But these two are totally different from each other. A Zombie Process is nearly the same thing which we see in lot of horror movies. Like the dead people which don't have any life force left, Zombie processes are the dead processes sitting in the process table and doing nothing.

To explain this in much better way, "Zombie process or defunct process is a process that have completed the execution, have released all the resources (CPU, memory) but still had an entry in the process table."

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Orphan Process

It's a pretty much common question asked in most of the interviews related to Linux, and most of the time people got it confused with Zombie Process. But these two are totally different from each other. An Orphan Process is nearly the same thing which we see in real world. Orphan means someone whose parents are dead. The same way Orphan process is a process, whose parents are dead, that means parents are either terminated, killed or exited but the child process is still alive.

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O’Reilly Velocity Online Conference

Theme: Speed and Stability
The Velocity Online Conference is the meeting ground where emerging trends are examined, predictions are made, and business models vetted in the Performance and Operations ecosystem. In this two hour online conference, you’ll have the opportunity to hear from experts, share your ideas, ask questions, and join in a conversation with panelists and other participants, all …

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HipHop for PHP project from Facebook

Today, Facebook shared one of its cool project – HipHop for PHP.

What is the use?
HipHop can reduce the CPU usage at the server even by 50% depending on the page executing PHP code. Reducing the overhead this way, it can help in scaling complex php websites. As per Facebook latest news, HipHop has shown incredible results for Facebook.…

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