On Fri, Apr 6, 2018 at 5:02 AM <sazon...@gmail.com> wrote:

> Hello, everybody.
> I would like to detail some moments about protobuf arena.
> In my project there is a structure with ~100 fields.
> I compared elapsed time for parse and serialize methods with arena and
> without it.
>
> 1.Arena:
> ....
> google::protobuf::Arena arena;
> ProtoStruct message  =
> google::protobuf::Arena::CreateMessage<ProtoType>(&arena);
> while (is_testing) {
>
> packet.ParseFromArray(...)
> ...read fields, change fields
> message.SerializeToArray(...);
>
> }
>
> 2.No arena:
>
> ProtoStruct message
> while (is_testing) {
>
> packet.ParseFromArray(...)
> ...read fields, change fields
> message.SerializeToArray(...);
>
> }
>
> The results didn't show any difference.
> I used 3.3.1.189 version and cloned from master branch, which allocates
> strings in arena.
>
> From this topic (https://github.com/google/protobuf/issues/4327)
> I see that there is no benefits from arena usage now.
> Is It true or I do something wrong?
>
Right now opensource protobuf arena only works well when you have a deep
message hierarchy but without string fields (which is very unlikely in most
common use cases). I suggest you wait for the support of STRING_PIECE to be
in place before trying arena again.


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