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help / color / mirror / Atom feedFrom: Heikki Linnakangas <[email protected]>
Subject: [PATCH v2 1/1] resownerbench
Date: Thu, 12 Nov 2020 00:40:45 +0200
---
contrib/resownerbench/Makefile | 17 ++
contrib/resownerbench/resownerbench--1.0.sql | 14 ++
contrib/resownerbench/resownerbench.c | 154 +++++++++++++++++++
contrib/resownerbench/resownerbench.control | 6 +
contrib/resownerbench/snaptest.sql | 37 +++++
5 files changed, 228 insertions(+)
create mode 100644 contrib/resownerbench/Makefile
create mode 100644 contrib/resownerbench/resownerbench--1.0.sql
create mode 100644 contrib/resownerbench/resownerbench.c
create mode 100644 contrib/resownerbench/resownerbench.control
create mode 100644 contrib/resownerbench/snaptest.sql
diff --git a/contrib/resownerbench/Makefile b/contrib/resownerbench/Makefile
new file mode 100644
index 00000000000..9b0e1cfee1a
--- /dev/null
+++ b/contrib/resownerbench/Makefile
@@ -0,0 +1,17 @@
+MODULE_big = resownerbench
+OBJS = resownerbench.o
+
+EXTENSION = resownerbench
+DATA = resownerbench--1.0.sql
+PGFILEDESC = "resownerbench - benchmark for ResourceOwners"
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+subdir = contrib/resownerbench
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif
diff --git a/contrib/resownerbench/resownerbench--1.0.sql b/contrib/resownerbench/resownerbench--1.0.sql
new file mode 100644
index 00000000000..d29182f5982
--- /dev/null
+++ b/contrib/resownerbench/resownerbench--1.0.sql
@@ -0,0 +1,14 @@
+/* contrib/resownerbench/resownerbench--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION resownerbench" to load this file. \quit
+
+CREATE FUNCTION snapshotbench_lifo(numkeep int, numsnaps int, numiters int)
+RETURNS double precision
+AS 'MODULE_PATHNAME', 'snapshotbench_lifo'
+LANGUAGE C STRICT VOLATILE;
+
+CREATE FUNCTION snapshotbench_fifo(numkeep int, numsnaps int, numiters int)
+RETURNS double precision
+AS 'MODULE_PATHNAME', 'snapshotbench_fifo'
+LANGUAGE C STRICT VOLATILE;
diff --git a/contrib/resownerbench/resownerbench.c b/contrib/resownerbench/resownerbench.c
new file mode 100644
index 00000000000..acfb6c39199
--- /dev/null
+++ b/contrib/resownerbench/resownerbench.c
@@ -0,0 +1,154 @@
+#include "postgres.h"
+
+#include "catalog/pg_type.h"
+#include "catalog/pg_statistic.h"
+#include "executor/spi.h"
+#include "funcapi.h"
+#include "libpq/pqsignal.h"
+#include "utils/catcache.h"
+#include "utils/syscache.h"
+#include "utils/timestamp.h"
+#include "utils/snapmgr.h"
+
+PG_MODULE_MAGIC;
+
+PG_FUNCTION_INFO_V1(snapshotbench_lifo);
+PG_FUNCTION_INFO_V1(snapshotbench_fifo);
+
+/*
+ * ResourceOwner Performance test, using RegisterSnapshot().
+ *
+ * This takes three parameters: numkeep, numsnaps, numiters.
+ *
+ * First, we register 'numkeep' snapshots. They are kept registed
+ * until the end of the test. Then, we repeatedly register and
+ * unregister 'numsnaps - numkeep' additional snapshots, repeating
+ * 'numiters' times. All the register/unregister calls are made in
+ * LIFO order.
+ *
+ * Returns the time spent, in milliseconds.
+ *
+ * The idea is to test the performance of ResourceOwnerRemember()
+ * and ReourceOwnerForget() operations, under different regimes.
+ *
+ * In the old implementation, if 'numsnaps' is small enough, all
+ * the entries fit in the resource owner's small array (it can
+ * hold 64 entries).
+ *
+ * In the new implementation, the array is much smaller, only 8
+ * entries, but it's used together with the hash table so that
+ * we stay in the "array regime" as long as 'numsnaps - numkeep'
+ * is smaller than 8 entries.
+ *
+ * 'numiters' can be adjusted to adjust the overall runtime to be
+ * suitable long.
+ */
+Datum
+snapshotbench_lifo(PG_FUNCTION_ARGS)
+{
+ int numkeep = PG_GETARG_INT32(0);
+ int numsnaps = PG_GETARG_INT32(1);
+ int numiters = PG_GETARG_INT32(2);
+ int i;
+ instr_time start,
+ duration;
+ Snapshot lsnap;
+ Snapshot *rs;
+ int numregistered = 0;
+
+ rs = palloc(Max(numsnaps, numkeep) * sizeof(Snapshot));
+
+ lsnap = GetLatestSnapshot();
+
+ PG_SETMASK(&BlockSig);
+ INSTR_TIME_SET_CURRENT(start);
+
+ while (numregistered < numkeep)
+ {
+ rs[numregistered] = RegisterSnapshot(lsnap);
+ numregistered++;
+ }
+
+ for (i = 0 ; i < numiters; i++)
+ {
+ while (numregistered < numsnaps)
+ {
+ rs[numregistered] = RegisterSnapshot(lsnap);
+ numregistered++;
+ }
+
+ while (numregistered > numkeep)
+ {
+ numregistered--;
+ UnregisterSnapshot(rs[numregistered]);
+ }
+ }
+
+ while (numregistered > 0)
+ {
+ numregistered--;
+ UnregisterSnapshot(rs[numregistered]);
+ }
+
+ INSTR_TIME_SET_CURRENT(duration);
+ INSTR_TIME_SUBTRACT(duration, start);
+ PG_SETMASK(&UnBlockSig);
+
+ PG_RETURN_FLOAT8(INSTR_TIME_GET_MILLISEC(duration));
+};
+
+
+/*
+ * Same, but do the register/unregister operations in
+ * FIFO order.
+ */
+Datum
+snapshotbench_fifo(PG_FUNCTION_ARGS)
+{
+ int numkeep = PG_GETARG_INT32(0);
+ int numsnaps = PG_GETARG_INT32(1);
+ int numiters = PG_GETARG_INT32(2);
+ int i,
+ j;
+ instr_time start,
+ duration;
+ Snapshot lsnap;
+ Snapshot *rs;
+ int numregistered = 0;
+
+ rs = palloc(Max(numsnaps, numkeep) * sizeof(Snapshot));
+
+ lsnap = GetLatestSnapshot();
+
+ PG_SETMASK(&BlockSig);
+ INSTR_TIME_SET_CURRENT(start);
+
+ while (numregistered < numkeep)
+ {
+ rs[numregistered] = RegisterSnapshot(lsnap);
+ numregistered++;
+ }
+
+ for (i = 0 ; i < numiters; i++)
+ {
+ while (numregistered < numsnaps)
+ {
+ rs[numregistered] = RegisterSnapshot(lsnap);
+ numregistered++;
+ }
+
+ for (j = numkeep; j < numregistered; j++)
+ UnregisterSnapshot(rs[j]);
+ numregistered = numkeep;
+ }
+
+ for (j = 0; j < numregistered; j++)
+ UnregisterSnapshot(rs[j]);
+ numregistered = numkeep;
+
+ INSTR_TIME_SET_CURRENT(duration);
+ INSTR_TIME_SUBTRACT(duration, start);
+ PG_SETMASK(&UnBlockSig);
+
+ PG_RETURN_FLOAT8(INSTR_TIME_GET_MILLISEC(duration));
+};
diff --git a/contrib/resownerbench/resownerbench.control b/contrib/resownerbench/resownerbench.control
new file mode 100644
index 00000000000..ada88b8eed8
--- /dev/null
+++ b/contrib/resownerbench/resownerbench.control
@@ -0,0 +1,6 @@
+# resownerbench
+
+comment = 'benchmark for ResourceOwners'
+default_version = '1.0'
+module_pathname = '$libdir/resownerbench'
+relocatable = true
diff --git a/contrib/resownerbench/snaptest.sql b/contrib/resownerbench/snaptest.sql
new file mode 100644
index 00000000000..e3c0a9710ee
--- /dev/null
+++ b/contrib/resownerbench/snaptest.sql
@@ -0,0 +1,37 @@
+--
+-- Performance test RegisterSnapshot/UnregisterSnapshot.
+--
+select numkeep, numsnaps,
+ -- numiters,
+ -- round(lifo_time_ms) as lifo_total_time_ms,
+ -- round(fifo_time_ms) as fifo_total_time_ms,
+ round((lifo_time_ms::numeric / (numkeep + (numsnaps - numkeep) * numiters)) * 1000000, 1) as lifo_time_ns,
+ round((fifo_time_ms::numeric / (numkeep + (numsnaps - numkeep) * numiters)) * 1000000, 1) as fifo_time_ns
+from
+(values (0, 1, 10000000 * 10),
+ (0, 5, 2000000 * 10),
+ (0, 10, 1000000 * 10),
+ (0, 60, 100000 * 10),
+ (0, 70, 100000 * 10),
+ (0, 100, 100000 * 10),
+ (0, 1000, 10000 * 10),
+ (0, 10000, 1000 * 10),
+
+-- These tests keep 9 snapshots registered across the iterations. That
+-- exceeds the size of the little array in the patch, so this exercises
+-- the hash lookups. Without the patch, these still fit in the array
+-- (it's 64 entries without the patch)
+ (9, 10, 10000000 * 10),
+ (9, 100, 100000 * 10),
+ (9, 1000, 10000 * 10),
+ (9, 10000, 1000 * 10),
+
+-- These exceed the 64 entry array even without the patch, so these fall
+-- in the hash table regime with and without the patch.
+ (65, 70, 1000000 * 10),
+ (65, 100, 100000 * 10),
+ (65, 1000, 10000 * 10),
+ (65, 10000, 1000 * 10)
+) AS params (numkeep, numsnaps, numiters),
+lateral snapshotbench_lifo(numkeep, numsnaps, numiters) as lifo_time_ms,
+lateral snapshotbench_fifo(numkeep, numsnaps, numiters) as fifo_time_ms;
--
2.29.2
--------------F30A5443A5D524A5CBC51AE7--
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