LVE (CloudLinux) Account Resource Usage Limits
LVE is a lightweight and transparent kernel level technology developed by the CloudLinux for shared web hosting services.
The main goal of LVE is to make sure that no website brings down the web server by limiting each account's resources.
CPU Usage - specifies how much of the allocated CPU resources you are currently using. The amount of CPU resources we provide to each account is the percentage of the server’s resources.
If CPU reaches 100% it means that your account is using all of the CPU resources allocated, and any new processes will be put to sleep until existing processes complete. This can cause your website to slow down dramatically and in extreme cases even time out.
Virtual Memory Usage/vMEM/vM corresponds to the amount of memory, processes can allocate within LVE. When the process tries to allocate memory, CloudLinux checks if the new total virtual memory used by all processes in LVE is within the limit set. If it is not, CloudLinux will prevent memory from being allocated and in most cases this causes the process to fail.
Physical Memory Usage/pMEM/pM (RAM) is the actual memory allocated for your account. Virtual memory is usually a file on a disk drive that the operating system uses to store information (swap-to-from) when the real memory becomes full, for instance the page (swap) file on a Linux system. Therefore, if you try to publish a big post, it might take all physical memory to do so, but after some time it will be normalized.
If this value reaches the limit you may begin to experience PHP errors (if applicable) on your website, or in very extreme cases may see a CloudLinux error page. These errors are typically only brief and once the usage has reduced to below the limit, will automatically clear.
Entry Processes/EP - the number of processes that enter your account. For example, every PHP page that is accessed by a user will usually generate a single entry process. Many people misinterpret this value as “number of visitors you can have on your website at once”. Whilst it is true that each visitor accessing a PHP page will spawn an entry process, these processes usually end so quickly that it is extremely unlikely that 10 will be spawned concurrently and at a single moment unless you had a significantly large number of simultaneous visitors on your website at once. SSH sessions and cron jobs also count as entry processes.
Number of Processes/nPROC/nP - this limit is similar to the above but includes all processes generated by the account rather than the specific PHP, SSH or cron jobs. This number is typically very low, even under high activity, as non-PHP tasks execute and complete even more quickly.
I/O Usage (input/output) represents how much I/O (or disk activity) your account is using. Any task which makes use of the servers disk drive (such as reading or writing to the server) will consume I/O. We limit the maximum disk speed of each account to ensure that no single account can saturate the disk drives which will reduce performance for everyone.
Reaching this limit will cause all processes to slow down (to within this limit) and take much longer to complete. Typically you won’t notice this setting ever increase unless you perform something disk intensive like generating a large backup of your account.
It is possible to check resource usage of your account in more details through another menu. Navigate to cPanel > Logs section and click on Resource Usage.
a - average used
l - limit set for account
m - maximal used
f - failure
For more details, have a look at the following article: The Benefits of using CloudLinux OS on your Website’s Hosting
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