Hi,
Im using a BinaryDecoder to read some Utf8s - and I'm reusing the same Utf8
instance.
I found there was a huge amount of allocation going on - and tracked it down to
Utf8#setByteLength:
...
public Utf8 setByteLength(int newLength) {
if (this.length < newLength) {
byte[] newBytes = new byte[newLength];
System.arraycopy(bytes, 0, newBytes, 0, this.length);
this.bytes = newBytes;
}
this.length = newLength;
this.string = null;
return this;
}
...
So, say I've got 4 Utf8s A,B,C and D lined up, with byte lengths A=1, B=10, C=5
and D=6 respectively, and do a read reusing the same Utf8 instance each time.
Read A: Causes allocation from empty buffer to buffer size 1 (ok)
Read B: Causes allocation from buffer size 1 to 10 (ok)
Read C: Reuses the buffer (ok)
Read D: Reallocates a buffer again, even though we've already got a 10 byte
buffer (???)
A simple 'fix' would be to compare the byte[] length rather than this.length
before doing a reallocation.
The only issue I can see with this though is that you cause a byte[] of the
largest utf you've read with that instance to stay in memory. If thats a
concern though, you could always provide a 'limit' on construction of the Utf8
(if the allocated byte[] goes greater than this, drop it and reallocate on the
next resize < limit).
If this something that would be considered for changing if I submit a patch /
jira?
Many thanks in advance,
Dave
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