No available memory on the Linux SpectroSERVER system

Products

• Spectrum

Issue/Introduction

Spectrum is installed on a Linux system with 24 GB of memory. Top shows 23 GB of memory being used but does not show which process is using up all the memory.

Running "ps -aux --sort -rss | more" showed the top 3 processes using less than 9 GB of memory. Again, it does not show which process could be taking up all the memory.

Environment

Release : Any version running on Linux

Component : Spectrum Core / SpectroSERVER

Cause

Issue looks like cache memory is not getting released properly.

Resolution

Run the following three commands to free up cached memory according to the reference link below:

sync; echo 1 > /proc/sys/vm/drop_caches

sync; echo 2 > /proc/sys/vm/drop_caches

sync; echo 3 > /proc/sys/vm/drop_caches

Additional Information

Reference: How to Clear RAM Memory Cache, Buffer and Swap Space on Linux