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Date: Tue, 26 Sep 2017 08:19:39 -0700 (MST)
From: endianignite <endianignite@gmail.com>
To: dev@ignite.apache.org
Message-ID: <1506439179781-0.post@n4.nabble.com>
Subject: Per-entry overhead - some questions
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archived-at: Tue, 26 Sep 2017 15:20:24 -0000

Hi Igniters,

I have been looking in to the per-entry overhead for Ignite cache entries
and have a couple of questions.

1. Does each GridCacheMapEntry require a reference to GridCacheContext<?, ?>
or could this field be removed/optimized in some way? Is the
GridCacheContext instance the same for every entry in a particular cache?

2. Is the GridCacheMapEntry extras field (a reference to
GridCacheEntryExtras) often/usually null? If so, could we find a clever way
to remove this field and save a further 8 bytes?

The reason for asking is that I am looking at a use-case where object sizes
are very small, but the number of objects is very large, and therefore the
overhead is substantial.  In this particular case, the overhead is 70-75% of
the consumed memory.

I look forward to hearing your thoughts.

Regards
Mike


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