Didn't actually include the changes in the previous patch.
--
Tristan Partin
Neon (https://neon.tech)
From 5b934691b88b3b2c5675bc778b0a10e9eeff3dbe Mon Sep 17 00:00:00 2001
From: Tristan Partin <tris...@neon.tech>
Date: Tue, 23 May 2023 11:48:16 -0500
Subject: [PATCH v5] Use COPY instead of INSERT for populating all tables
COPY is a better interface for bulk loading and/or high latency
connections. Previously COPY was only used for the pgbench_accounts
table because the amount of data was so much larger than the other
tables. However, as already said there are also gains to be had in the
high latency case, such as loading data across continents.
---
doc/src/sgml/ref/pgbench.sgml | 8 +-
src/bin/pgbench/pgbench.c | 153 ++++++++++++++++++++--------------
2 files changed, 94 insertions(+), 67 deletions(-)
diff --git a/doc/src/sgml/ref/pgbench.sgml b/doc/src/sgml/ref/pgbench.sgml
index 850028557d..4424595cc6 100644
--- a/doc/src/sgml/ref/pgbench.sgml
+++ b/doc/src/sgml/ref/pgbench.sgml
@@ -231,10 +231,10 @@ pgbench <optional> <replaceable>options</replaceable> </optional> <replaceable>d
extensively through a <command>COPY</command>.
<command>pgbench</command> uses the FREEZE option with version 14 or later
of <productname>PostgreSQL</productname> to speed up
- subsequent <command>VACUUM</command>, unless partitions are enabled.
- Using <literal>g</literal> causes logging to print one message
- every 100,000 rows while generating data for the
- <structname>pgbench_accounts</structname> table.
+ subsequent <command>VACUUM</command>. If partitions are enabled for
+ the <literal>pgbench_accounts</literal> table, the FREEZE option is
+ not enabled. Using <literal>g</literal> causes logging to print one
+ message every 100,000 rows while generating data for all tables.
</para>
<para>
With <literal>G</literal> (server-side data generation),
diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index 087baa7d57..8cc2e2bca4 100644
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -4859,17 +4859,46 @@ initTruncateTables(PGconn *con)
"pgbench_tellers");
}
-/*
- * Fill the standard tables with some data generated and sent from the client
- */
+typedef void initRow(PQExpBufferData *sql, int64 curr);
+
static void
-initGenerateDataClientSide(PGconn *con)
+initBranch(PQExpBufferData *sql, int64 curr)
+{
+ /* "filler" column defaults to NULL */
+ printfPQExpBuffer(sql,
+ INT64_FORMAT "\t0\t\n",
+ curr + 1);
+}
+
+static void
+initTeller(PQExpBufferData *sql, int64 curr)
+{
+ /* "filler" column defaults to NULL */
+ printfPQExpBuffer(sql,
+ INT64_FORMAT "\t" INT64_FORMAT "\t0\t\n",
+ curr + 1, curr / ntellers + 1);
+}
+
+static void
+initAccount(PQExpBufferData *sql, int64 curr)
{
+ /* "filler" column defaults to blank padded empty string */
+ printfPQExpBuffer(sql,
+ INT64_FORMAT "\t" INT64_FORMAT "\t0\t\n",
+ curr + 1, curr / naccounts + 1);
+}
+
+static void
+initPopulateTable(PGconn *con, const char *table, int64 base, initRow *init_row)
+{
+ int n;
+ int k;
+ int chars = 0;
+ PGresult *res;
PQExpBufferData sql;
- PGresult *res;
- int i;
- int64 k;
- char *copy_statement;
+ char copy_statement[256];
+ const char *copy_statement_fmt = "copy %s from stdin";
+ const int64 total = base * scale;
/* used to track elapsed time and estimate of the remaining time */
pg_time_usec_t start;
@@ -4878,50 +4907,24 @@ initGenerateDataClientSide(PGconn *con)
/* Stay on the same line if reporting to a terminal */
char eol = isatty(fileno(stderr)) ? '\r' : '\n';
- fprintf(stderr, "generating data (client-side)...\n");
-
- /*
- * we do all of this in one transaction to enable the backend's
- * data-loading optimizations
- */
- executeStatement(con, "begin");
-
- /* truncate away any old data */
- initTruncateTables(con);
-
initPQExpBuffer(&sql);
/*
- * fill branches, tellers, accounts in that order in case foreign keys
- * already exist
+ * Use COPY with FREEZE on v14 and later without partitioning. Remember
+ * that partitions only applies to pgbench_accounts.
*/
- for (i = 0; i < nbranches * scale; i++)
- {
- /* "filler" column defaults to NULL */
- printfPQExpBuffer(&sql,
- "insert into pgbench_branches(bid,bbalance) values(%d,0)",
- i + 1);
- executeStatement(con, sql.data);
- }
+ if (PQserverVersion(con) >= 140000) {
+ const bool is_pgbench_accounts = strcmp(table, "pgbench_accounts") == 0;
- for (i = 0; i < ntellers * scale; i++)
- {
- /* "filler" column defaults to NULL */
- printfPQExpBuffer(&sql,
- "insert into pgbench_tellers(tid,bid,tbalance) values (%d,%d,0)",
- i + 1, i / ntellers + 1);
- executeStatement(con, sql.data);
+ if (!is_pgbench_accounts || partitions == 0)
+ copy_statement_fmt = "copy %s from stdin with (freeze on)";
}
- /*
- * accounts is big enough to be worth using COPY and tracking runtime
- */
-
- /* use COPY with FREEZE on v14 and later without partitioning */
- if (partitions == 0 && PQserverVersion(con) >= 140000)
- copy_statement = "copy pgbench_accounts from stdin with (freeze on)";
- else
- copy_statement = "copy pgbench_accounts from stdin";
+ n = pg_snprintf(copy_statement, sizeof(copy_statement), copy_statement_fmt, table);
+ if (n >= sizeof(copy_statement))
+ pg_fatal("invalid buffer size: must be at least %d characters long", n);
+ else if (n == -1)
+ pg_fatal("invalid format string");
res = PQexec(con, copy_statement);
@@ -4931,14 +4934,11 @@ initGenerateDataClientSide(PGconn *con)
start = pg_time_now();
- for (k = 0; k < (int64) naccounts * scale; k++)
+ for (k = 0; k < total; k++)
{
- int64 j = k + 1;
+ const int64 j = k + 1;
- /* "filler" column defaults to blank padded empty string */
- printfPQExpBuffer(&sql,
- INT64_FORMAT "\t" INT64_FORMAT "\t0\t\n",
- j, k / naccounts + 1);
+ init_row(&sql, k);
if (PQputline(con, sql.data))
pg_fatal("PQputline failed");
@@ -4952,25 +4952,26 @@ initGenerateDataClientSide(PGconn *con)
if ((!use_quiet) && (j % 100000 == 0))
{
double elapsed_sec = PG_TIME_GET_DOUBLE(pg_time_now() - start);
- double remaining_sec = ((double) scale * naccounts - j) * elapsed_sec / j;
+ double remaining_sec = ((double) total - j) * elapsed_sec / j;
- fprintf(stderr, INT64_FORMAT " of " INT64_FORMAT " tuples (%d%%) done (elapsed %.2f s, remaining %.2f s)%c",
- j, (int64) naccounts * scale,
- (int) (((int64) j * 100) / (naccounts * (int64) scale)),
- elapsed_sec, remaining_sec, eol);
+ chars = fprintf(stderr, INT64_FORMAT " of " INT64_FORMAT " tuples (%d%%) of %s done (elapsed %.2f s, remaining %.2f s)%c",
+ j, total,
+ (int) ((j * 100) / total),
+ table, elapsed_sec, remaining_sec, eol);
}
/* let's not call the timing for each row, but only each 100 rows */
else if (use_quiet && (j % 100 == 0))
{
double elapsed_sec = PG_TIME_GET_DOUBLE(pg_time_now() - start);
- double remaining_sec = ((double) scale * naccounts - j) * elapsed_sec / j;
+ double remaining_sec = ((double) total - j) * elapsed_sec / j;
/* have we reached the next interval (or end)? */
- if ((j == scale * naccounts) || (elapsed_sec >= log_interval * LOG_STEP_SECONDS))
+ if ((j == total) || (elapsed_sec >= log_interval * LOG_STEP_SECONDS))
{
- fprintf(stderr, INT64_FORMAT " of " INT64_FORMAT " tuples (%d%%) done (elapsed %.2f s, remaining %.2f s)%c",
- j, (int64) naccounts * scale,
- (int) (((int64) j * 100) / (naccounts * (int64) scale)), elapsed_sec, remaining_sec, eol);
+ chars = fprintf(stderr, INT64_FORMAT " of " INT64_FORMAT " tuples (%d%%) of %s done (elapsed %.2f s, remaining %.2f s)%c",
+ j, total,
+ (int) ((j * 100) / total),
+ table, elapsed_sec, remaining_sec, eol);
/* skip to the next interval */
log_interval = (int) ceil(elapsed_sec / LOG_STEP_SECONDS);
@@ -4978,8 +4979,8 @@ initGenerateDataClientSide(PGconn *con)
}
}
- if (eol != '\n')
- fputc('\n', stderr); /* Need to move to next line */
+ if (chars != 0 && eol != '\n')
+ fprintf(stderr, "%*c\r", chars - 1, ' '); /* Clear the current line */
if (PQputline(con, "\\.\n"))
pg_fatal("very last PQputline failed");
@@ -4987,6 +4988,32 @@ initGenerateDataClientSide(PGconn *con)
pg_fatal("PQendcopy failed");
termPQExpBuffer(&sql);
+}
+
+/*
+ * Fill the standard tables with some data generated and sent from the client
+ */
+static void
+initGenerateDataClientSide(PGconn *con)
+{
+ fprintf(stderr, "generating data (client-side)...\n");
+
+ /*
+ * we do all of this in one transaction to enable the backend's
+ * data-loading optimizations
+ */
+ executeStatement(con, "begin");
+
+ /* truncate away any old data */
+ initTruncateTables(con);
+
+ /*
+ * fill branches, tellers, accounts in that order in case foreign keys
+ * already exist
+ */
+ initPopulateTable(con, "pgbench_branches", nbranches, initBranch);
+ initPopulateTable(con, "pgbench_tellers", ntellers, initTeller);
+ initPopulateTable(con, "pgbench_accounts", naccounts, initAccount);
executeStatement(con, "commit");
}
--
Tristan Partin
Neon (https://neon.tech)
