Enterprise Java applications often use up memory quickly, leading to extra computing costs. If memory is under-allocated, it causes performance issues, shown by frequent Full GCs and low GC efficiency. Analyzing GC logs can identify whether memory is under or over-allocated, offering useful insights for optimal memory allocation.
The article describes a production issue where an AWS EC2 application instance became unresponsive while others continued functioning. Investigation revealed repeated "TCP: out of memory" messages from the dmesg command. After an unsuccessful server restart, the instance was rebooted, resolving the issue. Kernel properties were identified to optimize TCP memory limits.