Sunday, June 22, 2014

Does CloudLinux (CentOS) CL6.5 use more memory than CL5.9?

The majority of our Sydney web hosting accounts recently moved to CloudLinux CL6.5 (from a CL5.9 server). As you may be aware, CloudLinux has revolutionised the hosting industry with a pseudo 'virtualisation' at the user-account level. As part of CloudLinux CageFS, alt-php has improved the security of servers worldwide, allowing various php versions to coexist in peace, with security. 

From the moment the accounts began to operate on CL6.5 many began firing alerts (PT_USERMEM notification by CSF) because of high memory usage. This only affected accounts on alt-php versions, but the peak (and frequent) memory usage was almost double CL5.9.

N.B. I'm quick to add here that performance isn't inhibited - we ensure all accounts have plenty of resources available; but from a hosts perspective, double memory consumption is significant and so surely it's been observed by other admins.

cPanel & CloudLinux Support
cPanel support created two servers to test the difference between CL5.9 and CL6.5 and did not a similar difference in virtual memory consumption, however the test was not conclusive. Similarly, CloudLinux support haven't been able to point to anything out of place, and while they confirm CL6.5 is so different it could like use memory very differently, they don't appear to have any evidence to support it. Could we be the only host that has noticed?

Notably, the difference has occasionally even been observed on accounts not making MySQL database queries, which are also not resource-intensive accounts, nor particularly busy.

So I'd like to throw the question open: 
Have you noticed greater (nearly double) virtual memory consumption on alt-php accounts on CloudLinux 6 versions?

How about CentOS 6 as opposed to 5, without the CloudLinux installation? While we have narrowed down alt-php sites, have you seen greater memory consumption on CentOS 6.x servers?

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Wednesday, April 25, 2012

Sustainable Keyboards - Bamboo Is The New Plastic!

Well I never.

A keyboard made from 92% bamboo - chosen because it is easily grown with less water, and easily recycled.

What's more, it's wireless (bluetooth), has it's own lithium-ion rechargeable battery, and is the same price as an Apple wireless keyboard of similar dimensions! Everyone says Apple uses the best design lines... but this just beautiful. It truly feels like nature meets technology and nature won. Waxed bamboo feels great on your fingertips too.

Read the Sustainable Wireless Keyboard Press Release, or buy the Bamboo Keyboard directly. They have a few other natural eco-friendly products available too, like an iPhone cover (albeit a bit pricey) and iPad/screen holders.

What I really thought was worth mentioning about this product and manufacturer, is that they seriously show their commitment to the environment by offering to recycle your keyboard at any time if you send it back to them, and they will give you a $10 voucher in return! Clever. And sustainable.

I think it's also great that they include a free iPhone recharge cable with the keyboard, so you can recharge it's onboard battery from a USB port. That makes it better to me than my Apple wireless keyboard, since it requires rechargeable AA batteries which require a separate charger. And I'm sure the extra iPhone USB cable will be useful to many smartphone users who are as frustrated as I was when the original cable  broke!

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