src-spring-framework

Spring Framework

History

Brian Clozel 4a555aaef1 Reduce heap memory usage in ConcurrentLruCache Prior to this commit, the `ConcurrentLruCache` implementation would use arrays of `AtomicReference` as operation buffers, and the buffer count would be calculated with the nearest power of two for the CPU count. This can result in significant heap memory usage as each `AtomicReference` buffer entry adds to the memory pressure. As seen in FasterXML/jackson-databind#3665, this can add a significant overhead for no real added benefit for the current use case. This commit changes the current implementation to use `AtomicReferenceArray` as buffers and reduce the number of buffers. JMH benchmarks results are within the error margin so we can assume that this does not change the performance characteristics for the typical use case in Spring Framework. Fixes gh-29520	2 years ago
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src	Reduce heap memory usage in ConcurrentLruCache	2 years ago
spring-core.gradle	…

Brian Clozel 4a555aaef1 Reduce heap memory usage in ConcurrentLruCache

Prior to this commit, the `ConcurrentLruCache` implementation would use
arrays of `AtomicReference` as operation buffers, and the buffer count
would be calculated with the nearest power of two for the CPU count.

This can result in significant heap memory usage as each
`AtomicReference` buffer entry adds to the memory pressure. As seen in
FasterXML/jackson-databind#3665, this can add a significant overhead for
no real added benefit for the current use case.

This commit changes the current implementation to use
`AtomicReferenceArray` as buffers and reduce the number of buffers.
JMH benchmarks results are within the error margin so we can assume that
this does not change the performance characteristics for the typical use
case in Spring Framework.

Fixes gh-29520

2 years ago

src

Reduce heap memory usage in ConcurrentLruCache

2 years ago

spring-core.gradle

…