I have a multisite wordpress instance running with 3.8 GB of RAM and 2.6 GHZ of Intel processor.
I am facing issue of site performance when more than 50 users get connected to the site. Site becomes unresponsive and gradually not accessible to users beyond this count of 50+ users. We get error as site is unreachable.
In normal day when there are around 20+ users the memory consumption of server is around 85% i.e. around 2 GB. with cache (SWAP) of around 1 GB.
So my question is, what should be done in order to have more users get connected to the site. We are expecting around 3000+ users on our event day.
Questions?
1) Does increasing the memory on server from 3.8 GB to higher value, help?
2) what changes has to be done in Wordpress application in order to boost performance on memory consumption and usage?
3) How ares php memory and server memory related?