10M memory leave after ShutdownAPI called for 1000 client created

[imchenkai]

Describe the bug

We use awsclient in multi threaded environment, The program will continuously generate and destroy awsclient instances。Found that may use alot of memory in this program and never release after showdownAPI called， Is this the expected behavior of awssdk?

Expected Behavior

should release memory after Aws::S3::S3Client deleted，or ShutdownAPI ?

Current Behavior

10M memory leave after ShutdownAPI called for 1000 client created

Reproduction Steps

this is code simple

int main()
{
    Aws::SDKOptions options;
    Aws::InitAPI(options);
    std::thread threads[16];
    int i;
    for (i = 0; i < 16; i++) {
        threads[i] = std::thread([i]() {
            int times = 0;
            while (times  < 100)  {
                std::cout << "run:" << times++  << std::endl;
                Aws::Client::ClientConfiguration config;
                config.endpointOverride = "[172.16.0.95:9000](http://172.16.0.95:9000/)";
                config.verifySSL = true;
                config.scheme = Aws::Http::Scheme::HTTP;
                config.requestTimeoutMs = 100;
                config.connectTimeoutMs = 100;
                Aws::Auth::AWSCredentials cred("minioadmin", "minioadmin");
                Aws::S3::S3Client s3_client(cred, config, Aws::Client::AWSAuthV4Signer::PayloadSigningPolicy::Never,
                                    false);
                Aws::S3::Model::ListObjectsRequest request;
                request.WithBucket("link"); 
                auto outcome = s3_client.ListObjects(request);

                if (outcome.IsSuccess())
                {
                    const Aws::Vector<Aws::S3::Model::Object>& objects = outcome.GetResult().GetContents();

                    if (!objects.empty())
                    {
                        const Aws::S3::Model::Object& first_object = objects[0];
                        Aws::S3::Model::GetObjectRequest get_request;
                        get_request.WithBucket("link") 
                                .WithKey(first_object.GetKey());
                    }
                }
            }
        });
    }

    for (i = 0; i < 16; ++i)
    {
        threads[i].join();
    }
    Aws::ShutdownAPI(options);
    return 0;
}

Possible Solution

No response

Additional Information/Context

No response

AWS CPP SDK version used

1.11.323

Compiler and Version used

9.3.1

Operating System and version

centos7

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