The hypervisor provides each guest machine (each website using the VPS) with a virtual operating system and takes care of managing and executing guest operating systems. This process makes the most effective use of computer resources such as network bandwidth, memory space and processor cycles. For this reason, a hypervisor also goes by the name of a virtual machine monitor (VMM).
It's also possible to select different PHP "execution modes" for each site at Virtualmin > Server Configuration > Website Options - I recommend FPM because it's significantly faster and uses less memory. I've found that the default settings sometimes result in excessive memory usage, which can be avoided by adding the following settings to Virtualmin > Services > PHP-FPM Configuration, which limit the lifetime of processes if a site has a memory leak:
If you want reasonably priced server space that won't load pages at a snail's pace when a neighboring site gets a huge traffic spike, VPS is a good option for your business. We've reviewed many VPS hosting services and included the best of the bunch in this guide. You should look into a dedicated server if you want to build a website on an even stronger foundation and can afford the bill.

# Get rid of "postscreen_cache: unable to get exclusive lock" errors


Think of a shared server as a large apartment complex, and all of the individual apartments are rented by other website owners. All of you need a place to live — just like your website’s files — but going out to buy a huge family home would be too expensive for your needs. Sharing common areas and utilities in an apartment block helps keep costs down. And the same is true for shared hosting.

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