Initial

Author: feodor

Makefile

@@ -0,0 +1,17 @@
+EXTENSION = memstat
+MODULES = memstat
+DATA = memstat--1.0.sql
+OBJS = memstat.o
+REGRESS = memstat
+
+ifdef USE_PGXS
+PGXS := $(shell pg_config --pgxs)
+include $(PGXS)
+else
+subdir = contrib/memstat
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif
+
+

README.md

@@ -0,0 +1,29 @@
+Module adds statistic report about memory contexts in local and all backends.
+
+Functions:
+
+setof (name text, level integer, nblocks bigint, freechunks bigint,
+	   totalspace bigint, freespace bigint)
+	local_memory_stats()
+	prints memory context's statistic for current backend
+
+setof (pid integer, name text, level integer, nblocks bigint, freechunks bigint,
+	   totalspace bigint, freespace bigint)
+	instance_memory_stats()
+	prints memory context's statistic for all alive backend, works if library
+	was preloaded via shared_preload_libraries.
+
+view memory_stats
+	prints per backend summary memory statistics 	
+
+To use instance_memory_stats() it's needed to add memstat library to
+shared_preload_libraries. And it should be last in that list!
+
+GUC variable:
+	memstat.period = 10 # seconds
+
+	Module collects memory statistics at a begining of each query and
+	it could be expensive on highloaded instances, so, this variable
+	set minimal time between statistic obtaining.
+
+Copyright (c) 2016, Teodor Sigaev <teodor@sigaev.ru>

expected/memstat.out

@@ -0,0 +1 @@
+CREATE EXTENSION memstat;

memstat--1.0.sql

@@ -0,0 +1,34 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION memstat" to load this file. \quit
+
+CREATE FUNCTION local_memory_stats(
+		OUT name text, OUT level int4,
+		OUT nblocks int8, OUT freechunks int8, OUT totalspace int8, OUT freespace int8)
+	RETURNS SETOF record
+	AS 'MODULE_PATHNAME', 'get_local_memory_stats'
+	LANGUAGE C IMMUTABLE;
+
+COMMENT ON FUNCTION local_memory_stats() IS
+	'statistic of local memory of backend';
+
+CREATE FUNCTION instance_memory_stats(
+		OUT pid int4, OUT name text, OUT level int4,
+		OUT nblocks int8, OUT freechunks int8, OUT totalspace int8, OUT freespace int8)
+	RETURNS SETOF record
+	AS 'MODULE_PATHNAME', 'get_instance_memory_stats'
+	LANGUAGE C IMMUTABLE;
+
+COMMENT ON FUNCTION instance_memory_stats() IS
+	'statistic of local memory of all backends';
+
+CREATE OR REPLACE VIEW memory_stats AS
+	SELECT
+		pid,
+		pg_size_pretty(sum(totalspace)) AS totalspace,
+		pg_size_pretty(sum(freespace)) AS freespace
+	FROM
+		instance_memory_stats()
+	GROUP BY
+		pid;
+		
+