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What is SLM memory?

By Tony Walker - Support Manager | March 25, 2008

We’ve been asked this question a couple of times recently, so I’ll add this reply to our Knowledgebase shortly but, for those reading this blog (and knowing that Dave is currently working up a special offer for visitors here), here’s a quick exlanation of what SLM memory is:

SLM is the method of memory management we use within Parallels (previously Virtuozzo) for controlling all aspects of the resources allocated to a VPS. The previous generation of this sort of memory management with Virtuozzo was called UBC or more commonly known as the /proc/user_beancounters file. With the older UBC, there are multiple variables when it comes to setting up memory, thus allowing a host to give you burst memory and the capability to limit certain other variables (such as your kernel memory).

SLM removes all of that, and instead just replaces those 20 or so memory variables with a single value, giving you the most guaranteed level of memory available today with Parallels/Virtuozzo. Most providers today still use the old UBC method of memory management, and have not yet stepped up to the capabilities of SLM.

All of our new 64-bit packages use SLM-guaranteed memory, which means that you are never having to rely on a share of whatever burst memory might be available on the node. Burst memory should never be relied upon, so instead we are providing you with a guaranteed environment for your VPS.

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