From b5b74b8c71b7e28df45b911fc759837bd9663235 Mon Sep 17 00:00:00 2001
From: Eugene Klimov <eklimov@altinity.com>
Date: Mon, 18 Nov 2024 18:04:24 +0400
Subject: [PATCH] add low_memory.xml for less clickhouse memory usage

---
 docker-compose.yaml              |  1 +
 docker/clickhouse/low_memory.xml | 34 ++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 docker/clickhouse/low_memory.xml

diff --git a/docker-compose.yaml b/docker-compose.yaml
index 81f36ccdf..de39ef8ab 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -20,6 +20,7 @@ services:
     volumes:
       - /var/log/clickhouse-server
       - ./docker/clickhouse/init_schema.sql:/docker-entrypoint-initdb.d/init_schema.sql
+      - ./docker/clickhouse/low_memory.xml:/etc/clickhouse-server/low_memory.xml
       - ./docker/clickhouse/postgres_dictionary.xml:/etc/clickhouse-server/postgres_dictionary.xml
       - ./docker/clickhouse/listen_ports.xml:/etc/clickhouse-server/config.d/listen_ports.xml
       - ./docker/clickhouse/ca-key.pem:/etc/clickhouse-server/ca-key.pem
diff --git a/docker/clickhouse/low_memory.xml b/docker/clickhouse/low_memory.xml
new file mode 100644
index 000000000..20c73bbcc
--- /dev/null
+++ b/docker/clickhouse/low_memory.xml
@@ -0,0 +1,34 @@
+<clickhouse>
+  <max_thread_pool_size>2000</max_thread_pool_size>
+  <merge_tree>
+    <merge_max_block_size>1024</merge_max_block_size>
+    <max_bytes_to_merge_at_max_space_in_pool>1073741824</max_bytes_to_merge_at_max_space_in_pool>
+    <number_of_free_entries_in_pool_to_lower_max_size_of_merge>0</number_of_free_entries_in_pool_to_lower_max_size_of_merge>
+    <number_of_free_entries_in_pool_to_execute_mutation>1</number_of_free_entries_in_pool_to_execute_mutation>
+    <number_of_free_entries_in_pool_to_execute_optimize_entire_partition>1</number_of_free_entries_in_pool_to_execute_optimize_entire_partition>
+  </merge_tree>
+
+  <mark_cache_size>268435456</mark_cache_size>
+  <index_mark_cache_size>67108864</index_mark_cache_size>
+  <uncompressed_cache_size>16777216</uncompressed_cache_size>
+  <mlock_executable>false</mlock_executable>
+
+  <max_connections>64</max_connections>
+  <max_concurrent_queries>8</max_concurrent_queries>
+  <max_server_memory_usage_to_ram_ratio>0.75</max_server_memory_usage_to_ram_ratio>
+
+  <background_buffer_flush_schedule_pool_size>1</background_buffer_flush_schedule_pool_size>
+  <background_pool_size>2</background_pool_size>
+  <background_merges_mutations_concurrency_ratio>2</background_merges_mutations_concurrency_ratio>
+  <background_merges_mutations_scheduling_policy>round_robin</background_merges_mutations_scheduling_policy>
+  <background_move_pool_size>1</background_move_pool_size>
+  <background_fetches_pool_size>1</background_fetches_pool_size>
+  <background_common_pool_size>2</background_common_pool_size>
+  <background_schedule_pool_size>8</background_schedule_pool_size>
+  <background_message_broker_schedule_pool_size>1</background_message_broker_schedule_pool_size>
+  <background_distributed_schedule_pool_size>1</background_distributed_schedule_pool_size>
+  <tables_loader_foreground_pool_size>0</tables_loader_foreground_pool_size>
+  <tables_loader_background_pool_size>0</tables_loader_background_pool_size>
+  <query_thread_log remove="1" />
+  <processors_profile_log remove="1" />
+</clickhouse>