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#!/usr/bin/env python
"""Copy operation micro-benchmarks."""
from __future__ import annotations
import sys
import asyncio
import logging
from time import time
from typing import Any
from argparse import ArgumentParser, Namespace
import psycopg
from psycopg import sql
from psycopg.abc import Query
logger = logging.getLogger()
logging.basicConfig(
level=logging.INFO,
format="%(asctime)s %(levelname)s %(message)s",
)
def main():
args = parse_cmdline()
logger.setLevel(args.loglevel)
if getattr(args, "async"):
asyncio.run(main_async(args))
else:
main_sync(args)
def main_sync(args: Namespace) -> None:
test = CopyPutTest(args)
with psycopg.Connection.connect(args.dsn) as conn:
with conn.cursor() as cur:
writer = getattr(psycopg.copy, args.writer)(cur) if args.writer else None
cur.execute(test.get_table_stmt())
t0 = time()
with cur.copy(test.get_copy_stmt(), writer=writer) as copy:
for i in range(args.nrecs):
copy.write_row(test.get_record())
tf = time()
logger.info("time to copy: %.6f sec", tf - t0)
async def main_async(args: Namespace) -> None:
test = CopyPutTest(args)
async with await psycopg.AsyncConnection.connect(args.dsn) as conn:
async with conn.cursor() as cur:
await cur.execute(test.get_table_stmt())
writer = getattr(psycopg.copy, args.writer)(cur) if args.writer else None
t0 = time()
async with cur.copy(test.get_copy_stmt(), writer=writer) as copy:
for i in range(args.nrecs):
await copy.write_row(test.get_record())
tf = time()
logger.info("time to copy: %.6f sec", tf - t0)
class CopyPutTest:
def __init__(self, args: Namespace):
self.args = args
def get_table_stmt(self) -> Query:
fields = sql.SQL(", ").join(
[sql.SQL(f"f{i} text") for i in range(self.args.nfields)]
)
stmt = sql.SQL(
"""\
create temp table testcopy (id serial primary key, {})
"""
).format(fields)
return stmt
def get_copy_stmt(self) -> Query:
fields = sql.SQL(", ").join(
[sql.Identifier(f"f{i}") for i in range(self.args.nfields)]
)
stmt = sql.SQL(
"""\
copy testcopy ({}) from stdin
"""
).format(fields)
return stmt
def get_record(self) -> tuple[Any, ...]:
return tuple("x" * self.args.colsize for _ in range(self.args.nfields))
def parse_cmdline() -> Namespace:
parser = ArgumentParser(description=__doc__)
parser.add_argument("--dsn", default="", help="database connection string")
parser.add_argument(
"--async", action="store_true", default=False, help="test async objects"
)
parser.add_argument(
"--nrecs",
type=int,
default=1000,
help="number of records to write [default: %(default)s]",
)
parser.add_argument(
"--nfields",
type=int,
default=10,
help="number of columns to write [default: %(default)s]",
)
parser.add_argument(
"--colsize",
type=int,
default=10,
help="width of each column to write [default: %(default)s]",
)
parser.add_argument("--writer", help="test alternative writer")
g = parser.add_mutually_exclusive_group()
g.add_argument(
"-q",
"--quiet",
help="Talk less",
dest="loglevel",
action="store_const",
const=logging.WARN,
default=logging.INFO,
)
g.add_argument(
"-v",
"--verbose",
help="Talk more",
dest="loglevel",
action="store_const",
const=logging.DEBUG,
default=logging.INFO,
)
if (args := parser.parse_args()).writer:
try:
getattr(psycopg.copy, args.writer)
except AttributeError:
parser.error(f"unknown writer: {args.writer!r}")
return args
if __name__ == "__main__":
sys.exit(main())
|
