Apache 2.4.54 - Performance Degradation with Keep-Alive and Large Number of Concurrent Connections
I'm having a hard time understanding I just started working with I'm migrating some code and I've looked through the documentation and I'm still confused about I'm experiencing important performance optimization with my Apache 2.4.54 server when handling a large number of concurrent connections... My application serves static content and is meant to handle hundreds of requests simultaneously, but it seems to struggle as the number of connections increases, leading to longer response times. I've configured Keep-Alive to improve performance, but it seems to have the opposite effect. Here’s what my configuration looks like in the `httpd.conf` file: ```apache KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 5 ``` When I monitor the server with `ab` (Apache Benchmark) for 200 concurrent requests, I notice that response times start to spike, and I receive several `503 Service Unavailable` errors. The server log shows entries like: ``` [Wed Oct 11 12:34:56.789012 2023] [core:behavior] [pid 12345:tid 140502003904256] (32)Broken pipe: [client 192.168.1.10:12345] AH10110: Connection terminated while reading response header from upstream ``` I’ve tried adjusting the `MaxKeepAliveRequests` value, but it doesn't seem to help. Also, I'm using `mod_status` to keep an eye on the server status, and it indicates a high number of idle connections during peak times, which makes me suspect that Keep-Alive is not being utilized effectively. Additionally, I’ve checked the system resource usage, and it seems the CPU and memory are underutilized, yet the connections are piling up. I’m unsure if this is a configuration scenario or if I need to look into optimizing my backend code or server resources. Any advice on how to approach this question would be greatly appreciated! I'm using Apache 3.9 in this project. What would be the recommended way to handle this? I'm working on a REST API that needs to handle this. Any suggestions would be helpful.