Does anyone have any insight on Evan's "related question" below?

On Thu, Jun 17, 2010 at 5:05 PM, Evan Jones <ev...@mit.edu> wrote:
> Related question: If I am writing length-prefixed values, what is the "best"
> way to do this? I think there are 3 approaches:
>
> 1. out.WriteVarint32(msg.ByteSize()); msg.SerializeToCodedStream(&out);
>
> This approach will choose between the "ToArray" and "regular" versions of
> the Serialize method, as appropriate. However, it computes the ByteSize
> twice.
>
> 2. out.WriteVarint32(msg.ByteSize()); msg.SerializeWithCachedSizes(&out);
>
> This computes the ByteSize once, but never uses the "fast path" ToArray
> method.
>
> 3. Some custom code that calls ByteSize once, then chooses between the
> "fast" and "slow" methods, as appropriate. Is there actually any significant
> difference in performance between SerializeWithCachedSizes and
> SerializeWithCachedSizesToArray, so it would be worth me actually doing
> this?

-Andy

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