[infinispan-dev] Interceptor stack for local caches

[Radim Vansa]

Hi,

few weeks ago I was looking into performance of local cache when 
compared to basic concurrent hash map, or data container. I can't find 
the exact results now, but the difference was in order of magnitude - 
IIRC concurrent hash map was about 20x faster than local cache. There 
was no 'bottleneck', but the versatile Infinispan design of commands 
traversing through interceptor stack brings some overhead (e.g. 
allocation costs with each invocation, not only for writes) while in 
some use cases it is not necessary to keep this complexity. The use case 
I am looking for is caching in Hibernate ORM, which basically requires 
only map with eviction, expiration and transactions in some cases. No 
need for cache stores, statistics etc. So far I've found ways to remove 
few interceptors [1], but it's few percent, not hundreds of percent 
where I would ideally aim.

Therefore, I was considering about an option to inspect cache 
configuration and in suitable cases return LocalCacheImpl that would get 
rid of the burden: no interceptor stack, no commands instantiation. This 
would be transparent to the user. I understand that it will increase 
maintenance costs, but it still seems better to me to have it under 
wings of Infinispan as caching solution rather than separate project, as 
it can share a lot of the codebase.

Do you think that this idea makes sense, or is it just too wild? Do you 
think I will crash when trying to implement this?

Radim

[1] https://issues.jboss.org/browse/ISPN-5542

-- 
Radim Vansa <rvansa at redhat.com>
JBoss Performance Team