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Why is my Apache server using so much memory?
Apache high memory usage is found to cause slow sites, page timeouts, and more. And here at Bobcares, our Support Engineers help web hosts, digital marketers and other online businesses keep their Apache servers super fast and stable. Today, we’ll go through the top 5 reasons we’ve seen for Apache high memory usage and how we fix them.
What happens when you swap memory in Apache?
The swap files’ latency can cause a bottleneck on the server as the Kernel attempts to read and write data faster than is physically possible or more commonly known as thrashing. If not caught immediately, thrashing spirals the system out of control leading to a system crash.
Do you need to reserve memory for Apache?
A pure Apache web node in a high capacity load balanced configuration does not need to reserve any additional ram for other services. Finding the average size of Apache processes is relatively simple using the ps command to list the RSS (Resident Set Size) of all running httpd processes.
What happens when Apache server is over tuned?
Before we get into the details of Apache tuning, we need to understand what happens when a VPS server or Dedicated server goes unresponsive due to a poorly optimized configuration. An over-tuned server is one that is configured to allow more simultaneous requests ( ServerLimit) than the server’s hardware can manage.
How does memory mapping affect Apache httpd performance?
On some platforms, this memory-mapping improves performance. However, there are cases where memory-mapping can hurt the performance or even the stability of the httpd: On some operating systems, mmap does not scale as well as read (2) when the number of CPUs increases.
How can I check the performance of my Apache server?
The procedure for doing this is simple: determine the size of your average Apache process, by looking at your process list via a tool such as top, and divide this into your total available memory, leaving some room for other processes.
How does Apache reduce the number of simultaneous connections?
When simultaneous connections increases, the amount of RAM Apache uses also increases. Some of the parameters that we tweak to reduce the number of simultaneous connections are : For e.g., MaxClients sets the limit on the number of simultaneous requests that can be supported by Apache webserver.