speed improvement of the tokenizer
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Key: VELOCITY-570
URL: https://issues.apache.org/jira/browse/VELOCITY-570
Project: Velocity
Issue Type: Bug
Components: Engine
Affects Versions: 1.5, 1.4, 1.6
Environment: Tested on FreeBSD 6.2-STABLE and Linux (Debian Etch) on
i386.
Java: JDK 1.5
Reporter: Ronald Klop
Fix For: 1.6
On some large templates (1-4MB) velocity gets very slow. I used JProfiler and
found a lot of time is spent in VelocityCharStream.ExpandBuff. It is doing a
lot of System.arraycopy.
The problem is that the size of the buffer is increased linearly in stead of
exponentialy.
I have made a patch which doubles the size of the buffer in stead of
incrementing it with the same value.
In my tests and in JProfiler it is shown that a lot less time is spent in
ExpandBuff.
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