fix pg_buffercache

Author: alexander popov

mamonsu/plugins/pgsql/driver/pool.py

@@ -32,9 +32,9 @@ class Pool(object):
             'select public.mamonsu_count_autovacuum()'
         ),
         'buffer_cache': (
-            "select sum(1) * 8 * 1024 as size, "
-            " sum(case when usagecount > 1 then 1 else 0 end) * 8 * 1024 as twice_used, "
-            " sum(case isdirty when true then 1 else 0 end) * 8 * 1024 as dirty "
+            "select sum(1) * (current_setting('block_size')::int8) as size, "
+            " sum(case when usagecount > 1 then 1 else 0 end) * (current_setting('block_size')::int8) as twice_used, "
+            " sum(case isdirty when true then 1 else 0 end) * (current_setting('block_size')::int8) as dirty "
             " from public.pg_buffercache",
             'select size, twice_used, dirty from public.mamonsu_buffer_cache()'
         ),

mamonsu/plugins/pgsql/pg_buffercache.py

@@ -7,10 +7,10 @@
 class PgBufferCache(Plugin):
     AgentPluginType = 'pg'
     key = 'pgsql.buffers{0}'
-    query_agent_size = "select sum(1) * 8 * 1024 as size from public.pg_buffercache;"  # for zabbix
-    query_agent_twice_used = "select sum(case when usagecount > 1 then 1 else 0 end) * 8 * 1024 as twice_used " \
+    query_agent_size = "select sum(1) *  (current_setting('block_size')::int8) as size from public.pg_buffercache;"  # for zabbix
+    query_agent_twice_used = "select sum(case when usagecount > 1 then 1 else 0 end) *  (current_setting('block_size')::int8) as twice_used " \
                              "from public.pg_buffercache;" # for zabbix
-    query_agent_dirty = "select sum(case isdirty when true then 1 else 0 end) * 8 * 1024 as dirty " \
+    query_agent_dirty = "select sum(case isdirty when true then 1 else 0 end) *  (current_setting('block_size')::int8) as dirty " \
                         "from public.pg_buffercache;" # for zabbix
     query = [query_agent_size, query_agent_twice_used, query_agent_dirty]
     Items = [

mamonsu/tools/bootstrap/sql.py

@@ -95,9 +95,9 @@
 CREATE OR REPLACE FUNCTION public.mamonsu_buffer_cache()
 RETURNS TABLE(SIZE BIGINT, TWICE_USED BIGINT, DIRTY BIGINT) AS $$
 SELECT
-   SUM(1) * 8 * 1024,
-   SUM(CASE WHEN usagecount > 1 THEN 1 ELSE 0 END) * 8 * 1024,
-   SUM(CASE isdirty WHEN true THEN 1 ELSE 0 END) * 8 * 1024
+   SUM(1) * (current_setting('block_size')::int8),
+   SUM(CASE WHEN usagecount > 1 THEN 1 ELSE 0 END) * (current_setting('block_size')::int8),
+   SUM(CASE isdirty WHEN true THEN 1 ELSE 0 END) * (current_setting('block_size')::int8)
 FROM public.pg_buffercache
 $$ LANGUAGE SQL SECURITY DEFINER;