Ok, thanks for reply.
Best regards, Dmitry.
пятница, 6 апреля 2018 г., 21:35:44 UTC+3 пользователь Feng Xiao написал:
>
>
>
> On Fri, Apr 6, 2018 at 5:02 AM <sazo...@gmail.com <javascript:>> 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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