Adjust vheap sizes for message handling processes on Erlang/OTP 27

deps/rabbit/app.bzl

@@ -194,6 +194,7 @@ def all_beam_files(name = "all_beam_files"):
             "src/rabbit_prelaunch_logging.erl",
             "src/rabbit_priority_queue.erl",
             "src/rabbit_process.erl",
+            "src/rabbit_process_flag.erl",
             "src/rabbit_queue_consumers.erl",
             "src/rabbit_queue_decorator.erl",
             "src/rabbit_queue_index.erl",
@@ -452,6 +453,7 @@ def all_test_beam_files(name = "all_test_beam_files"):
             "src/rabbit_prelaunch_logging.erl",
             "src/rabbit_priority_queue.erl",
             "src/rabbit_process.erl",
+            "src/rabbit_process_flag.erl",
             "src/rabbit_queue_consumers.erl",
             "src/rabbit_queue_decorator.erl",
             "src/rabbit_queue_index.erl",
@@ -733,6 +735,7 @@ def all_srcs(name = "all_srcs"):
             "src/rabbit_prelaunch_logging.erl",
             "src/rabbit_priority_queue.erl",
             "src/rabbit_process.erl",
+            "src/rabbit_process_flag.erl",
             "src/rabbit_queue_consumers.erl",
             "src/rabbit_queue_decorator.erl",
             "src/rabbit_queue_index.erl",

deps/rabbit/src/rabbit_amqp_session.erl

@@ -391,7 +391,7 @@ init({ReaderPid, WriterPid, ChannelNum, MaxFrameSize, User, Vhost, ConnName,
          outgoing_window = ?UINT(RemoteOutgoingWindow),
          handle_max = ClientHandleMax}}) ->
     process_flag(trap_exit, true),
-    process_flag(message_queue_data, off_heap),
+    rabbit_process_flag:adjust_for_message_handling_proc(),
 
     ok = pg:join(pg_scope(), self(), self()),
     Alarms0 = rabbit_alarm:register(self(), {?MODULE, conserve_resources, []}),

deps/rabbit/src/rabbit_channel.erl

@@ -484,6 +484,8 @@ update_user_state(Pid, UserState) when is_pid(Pid) ->
 init([Channel, ReaderPid, WriterPid, ConnPid, ConnName, Protocol, User, VHost,
       Capabilities, CollectorPid, LimiterPid, AmqpParams]) ->
     process_flag(trap_exit, true),
+    rabbit_process_flag:adjust_for_message_handling_proc(),
+
     ?LG_PROCESS_TYPE(channel),
     ?store_proc_name({ConnName, Channel}),
     ok = pg_local:join(rabbit_channels, self()),

deps/rabbit/src/rabbit_process_flag.erl

@@ -0,0 +1,31 @@
+%% This Source Code Form is subject to the terms of the Mozilla Public
+%% License, v. 2.0. If a copy of the MPL was not distributed with this
+%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
+%%
+%% Copyright (c) 2007-2024 Broadcom. All Rights Reserved. The term “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. All rights reserved.
+%%
+
+-module(rabbit_process_flag).
+
+
+-export([adjust_for_message_handling_proc/0
+        ]).
+
+%% Adjust process flags for processes that handle RabbitMQ messages.
+%% For example any process that uses the `rabbit_queue_type' module
+%% may benefit from this tuning.
+%% @returns `ok'
+-spec adjust_for_message_handling_proc() -> ok.
+adjust_for_message_handling_proc() ->
+    process_flag(message_queue_data, off_heap),
+    case code_version:get_otp_version() of
+        OtpMaj when OtpMaj >= 27 ->
+            %% 46422 is the default min_bin_vheap_size and for OTP 27 and above
+            %% we want to substantially increase it for processes that may buffer
+            %% messages. 32x has proven workable in testing whilst not being
+            %% ridiculously large
+            process_flag(min_bin_vheap_size, 46422 * 32),
+            ok;
+        _ ->
+            ok
+    end.

deps/rabbit/src/rabbit_ra_systems.erl

@@ -24,6 +24,9 @@
 -define(COORD_WAL_MAX_SIZE_B, 64_000_000).
 -define(QUORUM_AER_MAX_RPC_SIZE, 16).
 -define(QUORUM_DEFAULT_WAL_MAX_ENTRIES, 500_000).
+%% the default min bin vheap value in OTP 26
+-define(MIN_BIN_VHEAP_SIZE_DEFAULT, 46422).
+-define(MIN_BIN_VHEAP_SIZE_MULT, 64).
 
 -spec setup() -> ok | no_return().
 
@@ -107,7 +110,6 @@ ensure_ra_system_started(RaSystem) ->
     end.
 
 -spec get_config(ra_system_name()) -> ra_system:config().
-
 get_config(quorum_queues = RaSystem) ->
     DefaultConfig = get_default_config(),
     Checksums = application:get_env(rabbit, quorum_compute_checksums, true),
@@ -124,7 +126,16 @@ get_config(quorum_queues = RaSystem) ->
     AERBatchSize = application:get_env(rabbit, quorum_max_append_entries_rpc_batch_size,
                                        ?QUORUM_AER_MAX_RPC_SIZE),
     CompressMemTables = application:get_env(rabbit, quorum_compress_mem_tables, true),
+    MinBinVheapSize = case code_version:get_otp_version() of
+                          OtpMaj when OtpMaj >= 27 ->
+                              ?MIN_BIN_VHEAP_SIZE_DEFAULT * ?MIN_BIN_VHEAP_SIZE_MULT;
+                          _ ->
+                              ?MIN_BIN_VHEAP_SIZE_DEFAULT
+                      end,
+
     DefaultConfig#{name => RaSystem,
+                   wal_min_bin_vheap_size => MinBinVheapSize,
+                   server_min_bin_vheap_size => MinBinVheapSize,
                    default_max_append_entries_rpc_batch_size => AERBatchSize,
                    wal_compute_checksums => WalChecksums,
                    wal_max_entries => WalMaxEntries,

deps/rabbit_common/src/code_version.erl

@@ -116,6 +116,7 @@ get_forms(Code) ->
             throw({no_abstract_code, Reason})
     end.
 
+-spec get_otp_version() -> non_neg_integer().
 get_otp_version() ->
     Version = erlang:system_info(otp_release),
     case re:run(Version, "^[0-9][0-9]", [{capture, first, list}]) of

moduleindex.yaml

@@ -696,6 +696,7 @@ rabbit:
 - rabbit_prelaunch_logging
 - rabbit_priority_queue
 - rabbit_process
+- rabbit_process_flag
 - rabbit_queue_consumers
 - rabbit_queue_decorator
 - rabbit_queue_index