7.5.1 Very serious performance problems

[3419912225]

After version 7.5.1 and the number of online users reaches 100 at the same time, the process occupancy of mongodb and node.js will be very terrible, and it will always be around 100%, which is often stuck. Please check it carefully. I will not have this problem when I switch back to version 7.4.1. Version 7.5.1 simply can't support many users to use at the same time!

[Gummikavalier]

No issues for us with 500+ active online users with RC 7.5.1. More detail is probably needed, as we run 4 concurrent instances (processes) on the host at the same time (meaning ~125+ users per process). You are probably running only one?

Years ago I did some testing and I was able to run 500 active users on a single process, but I haven't tested it recently. I may repeat that test next week when I get the chance.

Also one chance is that the problem is some specific malfunctioning message that triggers the issue in RC 7.5.1 but not in RC 7.4.1 on your instance. Such example from the past was a message that contained specific text in xml format, and that was fixed eventually.

[Gummikavalier]

The test with over 500 users with a single RC process is ready. We didn't spot performance issues.

The CPU load was ~ 5 % lower compared to running with 4 processes on the same server; A drop in hourly graph from slightly under 20% average to 10 - 15% average. Depending on your scenario this may or may not be meaningful. (If you run a lot of processes that might cause higher overhead for database communication, for instance.)

[reetp]

GridFS.

Stop using it.