Alexander Gerus created IGNITE-9112:
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Summary: Pre-touch for Ignite off-heap memory
Key: IGNITE-9112
URL: https://issues.apache.org/jira/browse/IGNITE-9112
Project: Ignite
Issue Type: New Feature
Affects Versions: 2.6, 2.5, 2.4
Reporter: Alexander Gerus
At the moment Ignite off-heap memory is allocated in virtual memory of
operating system, not physical memory: it is recorded in an internal data
structure to avoid it being used by any other process. Not even a single page
will be allocated in physical memory until it's actually accessed. When the
Ignite needs memory, the operating system will allocate pages as needed.
The proposal is to add an option to Ignite that will touch every single byte of
the max off heap with a '0', resulting in the memory being allocated in the
physical memory in addition to being reserved in the internal data structure
(virtual memory). Similar option is available in JVM {{-XX:+AlwaysPreTouch}}
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