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This provides a pytest fixture to record metrics from pytest tests. The The recorded metrics are printed out at the end of the tests. As a starter, this includes on small test, using pgbench. It prints out three metrics: the initialization time, runtime of 5000 xacts, and the repository size after the tests.
68 lines
2.4 KiB
Python
68 lines
2.4 KiB
Python
import os
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from contextlib import closing
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from fixtures.zenith_fixtures import PostgresFactory, ZenithPageserver
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pytest_plugins = ("fixtures.zenith_fixtures", "fixtures.benchmark_fixture")
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def get_timeline_size(repo_dir: str, tenantid: str, timelineid: str):
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path = "{}/tenants/{}/timelines/{}".format(repo_dir, tenantid, timelineid)
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totalbytes = 0
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for root, dirs, files in os.walk(path):
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for name in files:
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totalbytes += os.path.getsize(os.path.join(root, name))
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if 'wal' in dirs:
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dirs.remove('wal') # don't visit 'wal' subdirectory
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return totalbytes
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#
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# Run a very short pgbench test.
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#
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# Collects three metrics:
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#
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# 1. Time to initialize the pgbench database (pgbench -s5 -i)
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# 2. Time to run 5000 pgbench transactions
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# 3. Disk space used
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#
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def test_pgbench(postgres: PostgresFactory, pageserver: ZenithPageserver, pg_bin, zenith_cli, zenbenchmark, repo_dir: str):
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# Create a branch for us
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zenith_cli.run(["branch", "test_pgbench_perf", "empty"])
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pg = postgres.create_start('test_pgbench_perf')
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print("postgres is running on 'test_pgbench_perf' branch")
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# Open a connection directly to the page server that we'll use to force
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# flushing the layers to disk
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psconn = pageserver.connect();
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pscur = psconn.cursor()
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# Get the timeline ID of our branch. We need it for the 'do_gc' command
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with closing(pg.connect()) as conn:
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with conn.cursor() as cur:
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cur.execute("SHOW zenith.zenith_timeline")
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timeline = cur.fetchone()[0]
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connstr = pg.connstr()
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# Initialize pgbench database
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with zenbenchmark.record_duration('init'):
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pg_bin.run_capture(['pgbench', '-s5', '-i', connstr])
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# Flush the layers from memory to disk. The time to do that is included in the
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# reported init time.
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pscur.execute(f"do_gc {pageserver.initial_tenant} {timeline} 0")
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# Run pgbench for 5000 transactions
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with zenbenchmark.record_duration('5000_xacts'):
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pg_bin.run_capture(['pgbench', '-c1', '-t5000', connstr])
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# Flush the layers to disk again. This is *not' included in the reported time,
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# though.
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pscur.execute(f"do_gc {pageserver.initial_tenant} {timeline} 0")
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# Report disk space used by the repository
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timeline_size = get_timeline_size(repo_dir, pageserver.initial_tenant, timeline)
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zenbenchmark.record('size', timeline_size / (1024*1024), 'MB')
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