Should SWOP be used as a memory replacement in a server?

Question

Solid State Drives

Fixed configuration in the cloud. CPU usage 6%, memory 100%, swap 100%, SSD screw. Is it worth increasing the SWOP in order to increase the running processes (to bring the processor load to at least 30%)?
I will answer possible questions in advance:
1. An increase in memory entails an increase in processor cores and prices (we are talking about the cloud)
2. SSD durability is not of interest for the same reason.
3. I know that SATA speed is ten times slower than DDR

Answer 1

No, it's not worth it! If the memory is actively used, then the processor, when adding a swap, will bump into the performance of the disk system and will also be idle. After all, the processor needs to get a page from the swap, replace it in real memory, and only then transfer control to the program.
I suspect that it is worth mongodb, which ate all the memory. If so, then run the mongo in a separate instance or in a container.
Also, in the above example with 100% memory usage and swap, it seems to me that I need to deal with the application that memory loves so much - this is not normal!

Answer 2

if linux, then try the ZRAM module, it will help to improve the utilization of the processor with the same amount of memory and increase the current performance.