All, I've been doing some profiling looking for wasted memory in my webapp and I've discovered that org.apache.velocity.runtime.parser.Parser contains a few members that appear to be (essentially) duplicates.
First, there is the "velocharstream" member which is a
VelocityCharStream. Then, there is also a token_source member which is a
ParserTokenManager which has a separate VelocityCharStream
("velcharstream" member). YourKit reports that these two are distinct
objects, and they don't appear to share anything so I think they really
are distinct.
Each VelocityCharStream has a pair of 4096-byte buffers ("bufcolumn" and
"bufline") plus a 8192-byte buffer in the "inputStream" member (a
java.io.InputStreamReader), so each Parser is currently eating up 16k of
memory in buffers. Yes, I know it's really nothing, but I'm wondering if
buffers (or streams) are being allocated when they don't need to be
allocated.
Does anyone know why there might be two separate VelocityCharStreams at
the Parser level? How about the 2 bufline/bufcolumn buffers in
VelocityCharStream as well as the 8192-byte InputStreamReader buffer?
The code has no inline documentation of Javadoc to suggest the purpose
of these members.
Thanks,
-chris
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