Using COPY FREEZE in pgbench

Currently pgbench uses plain COPY to populate pgbench_accounts
table. With adding FREEZE option to COPY, the time to perform "pgbench
-i" will be significantly reduced.

Curent master:
pgbench -i -s 100
:
:
done in 70.78 s (drop tables 0.21 s, create tables 0.02 s, client-side generate 12.42 s, vacuum 51.11 s, primary keys 7.02 s).

Using FREEZE:
done in 16.86 s (drop tables 0.20 s, create tables 0.01 s, client-side generate 11.86 s, vacuum 0.25 s, primary keys 4.53 s).

As you can see total time drops from 70.78 seconds to 16.86 seconds,
that is 4.1 times faster. This is mainly because vacuum takes only
0.25 seconds after COPY FREEZE while unpatched pgbench takes 51.11
seconds, which is 204 times slower.

Thanks for the COPY FREEZE patch recently committed:
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=7db0cd2145f2bce84cac92402e205e4d2b045bf2

Attached is one line patch for this.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp