Would you please provide more information about how you free the service? 
I'm also not sure about how grpc gc works, maybe somebody from grpc team 
could give better answer.

PS: For manually free arena, you could use Reset 
<https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/arena.h#L374>

On Wednesday, January 9, 2019 at 5:51:33 PM UTC-8, Srikanth wrote:
>
> Hi,
>
> I am using gRPC v1.17.2 for implementing CLI for my process. The gRPC 
> server is in C++ and the client is in Golang. 
>
> The protobuf definition looks like this
>
> message GetResponseMsg {
>
>   repeated GetResponse           response   = 1;    // response
>
> }
>
> message GetResponse {
>
>   Spec         spec       = 1;
>
>   Status       status     = 2;
>
>   Stats        stats      = 3;
>
> }
>
>
> Each Response is probably around 500 Bytes in size all considered. The 
> number of responses I am trying to retrieve runs to about 200000.
>
>
> The server implementation looks like this
>
>
> Status
>
> Get(ServerContext *context,
>
>                  const GetRequestMsg *req,
>
>                  GetResponseMsg *rsp)
>
> {
>
>     uint32_t    i, nreqs = req->request_size();
>
>
>     for (i = 0; i < nreqs; i++) {
>
>         auto request = req->request(i);
>
>         get(request, rsp->add_response());
>
>     }
>
>
>     return Status::OK;
>
> }
>
>
> Obviously with the size of each response and the number of responses I 
> expect a lot of memory usage but thought the memory should be recovered 
> after this command is run. But this memory is never recovered and I rapidly 
> run out of memory and my process crashes. 
>
>
> I enabled usage of Arena in the proto file but that didn't change 
> anything. Is there anything I need to add to free up the memory used after 
> the CLI command is run? 
>
>
> I am a newbie to gRPC so am sorry if I have missed out on anything simple! 
> Any help is appreciated.
>

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