Memory swap occurs while the pagecache is reclaimed

Memory swap occurs while the pagecache is reclaimed

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Solution Verified - Updated August 9 2024 at 4:26 AM - English Environment Red Hat Enterprise Linux 7.2 with a large memory size Issue If most or all of the memory is consumed in the pagecache and a very large anonymous memory workload is applied to the system swapping can occur at the same time the pagecache memory is being reclaimed for the anonymous workload. The behaviour may result in the depletion of the swap space and OOM of processes. Resolution Disable transparent huge pages (THP) as follows: Raw echo never > /sys/kernel/mm/transparent_hugepage/enabled Root Cause Transparent huge pages(THP) (2MB) is enabled by default which consumes free memory much faster than small pages(4KB). Allocating and touching 2MB pages happens 512 times faster than allocating and touching 4KB pages. Product(s) Red Hat Enterprise LinuxComponent kernelCategory Hardware CertificationTags kernel memory This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.

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