Benchmark of gen_random_uuid versus uuid_generate_v1

gen_random_uuid-vs-uuid_generate_v1.sql

-- You must run the benchmark schema localed in 
-- https://gist.github.com/erichosick/eeadc41e33ea2a91bd136b9433e73dc7
-- before running the following benchmark

DO $$
DECLARE d_exec_count int = 20;
DECLARE d_left_sql text;
DECLARE d_right_sql text;
BEGIN

  d_left_sql = '
    SELECT uuid_generate_v1()
    FROM generate_series(%s,%s) AS series;
  ';

  d_right_sql = '
    SELECT CLOCK_TIMESTAMP(), gen_random_uuid()
    FROM generate_series(%s,%s) AS series;
  ';

  FOR run_number IN 1..4 LOOP
    CALL benchmark.execute(
      FORMAT('uuid_generate_v1 10^%s', run_number),
      'clock_timestamp + gen_random_uuid'::text,
      (10^run_number)::bigint,
      FORMAT(d_left_sql, 1, 10^run_number),
      FORMAT(d_right_sql, 1, 10^run_number),
      d_exec_count
    );
  END LOOP;

  FOR run_number IN 1..9 LOOP
    CALL benchmark.execute(
      FORMAT('uuid_generate_v1 %s*10^5',run_number),
      'clock_timestamp + gen_random_uuid'::text,
      (run_number*10^5)::bigint,
      FORMAT(d_left_sql, 1, run_number*10^5),
      FORMAT(d_right_sql, 1, run_number*10^5),
      d_exec_count
    );
  END LOOP;

END;
$$;

SELECT
  thresh.faster_sql,
  thresh.description_sql_left || ' -  '
  || thresh.description_sql_right || ' | '
  || thresh.times_faster || 'x  | '
  || thresh.average_left || ' ± ' ||
  thresh.standard_deviation_left || ' | ' ||
  thresh.average_right || ' ± ' ||
  standard_deviation_right AS data_row
FROM benchmark.compare_result_outcome AS thresh
INNER JOIN benchmark.compare AS comp
  ON comp.description_sql_left = thresh.description_sql_left
  AND comp.description_sql_right = thresh.description_sql_right
ORDER BY comp.created_on ASC;