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[PATCH v3 8/9] simplebench/bench-backup: add --drop-caches argument
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH v3 8/9] simplebench/bench-backup: add --drop-caches argument |
Date: |
Tue, 23 Mar 2021 16:47:33 +0300 |
Add an option to drop caches before each test run. It may probably
improve reliability of results when testing in cached mode.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
scripts/simplebench/bench-backup.py | 6 +++++-
scripts/simplebench/simplebench.py | 11 ++++++++++-
2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/scripts/simplebench/bench-backup.py
b/scripts/simplebench/bench-backup.py
index 092fed5816..5a0675c593 100755
--- a/scripts/simplebench/bench-backup.py
+++ b/scripts/simplebench/bench-backup.py
@@ -156,7 +156,8 @@ def bench(args):
})
result = simplebench.bench(bench_func, test_envs, test_cases,
- count=args.count, initial_run=args.initial_run)
+ count=args.count, initial_run=args.initial_run,
+ drop_caches=args.drop_caches)
with open('results.json', 'w') as f:
json.dump(result, f, indent=4)
print(results_to_text(result))
@@ -221,4 +222,7 @@ def __call__(self, parser, namespace, values,
option_string=None):
Do additional initial run per cell which doesn't count in result,
default true''')
+ p.add_argument('--drop-caches', action='store_true', help='''\
+Do "sync; echo 3 > /proc/sys/vm/drop_caches" before each test run''')
+
bench(p.parse_args())
diff --git a/scripts/simplebench/simplebench.py
b/scripts/simplebench/simplebench.py
index 27bc4d4715..8efca2af98 100644
--- a/scripts/simplebench/simplebench.py
+++ b/scripts/simplebench/simplebench.py
@@ -19,11 +19,17 @@
#
import statistics
+import subprocess
import time
+def do_drop_caches():
+ subprocess.run('sync; echo 3 > /proc/sys/vm/drop_caches', shell=True,
+ check=True)
+
+
def bench_one(test_func, test_env, test_case, count=5, initial_run=True,
- slow_limit=100):
+ slow_limit=100, drop_caches=False):
"""Benchmark one test-case
test_func -- benchmarking function with prototype
@@ -40,6 +46,7 @@ def bench_one(test_func, test_env, test_case, count=5,
initial_run=True,
initial_run -- do initial run of test_func, which don't get into result
slow_limit -- stop at slow run (that exceedes the slow_limit by seconds).
(initial run is not measured)
+ drop_caches -- drop caches before each run
Returns dict with the following fields:
'runs': list of test_func results
@@ -53,6 +60,7 @@ def bench_one(test_func, test_env, test_case, count=5,
initial_run=True,
"""
if initial_run:
print(' #initial run:')
+ do_drop_caches()
print(' ', test_func(test_env, test_case))
runs = []
@@ -60,6 +68,7 @@ def bench_one(test_func, test_env, test_case, count=5,
initial_run=True,
t = time.time()
print(' #run {}'.format(i+1))
+ do_drop_caches()
res = test_func(test_env, test_case)
print(' ', res)
runs.append(res)
--
2.29.2
- [PATCH v3 0/9] simplebench improvements, Vladimir Sementsov-Ogievskiy, 2021/03/23
- [PATCH v3 7/9] simplebench/bench-backup: add --count and --no-initial-run, Vladimir Sementsov-Ogievskiy, 2021/03/23
- [PATCH v3 4/9] simplebench/bench-backup: add target-cache argument, Vladimir Sementsov-Ogievskiy, 2021/03/23
- [PATCH v3 5/9] simplebench/bench_block_job: handle error in BLOCK_JOB_COMPLETED, Vladimir Sementsov-Ogievskiy, 2021/03/23
- [PATCH v3 1/9] simplebench: bench_one(): add slow_limit argument, Vladimir Sementsov-Ogievskiy, 2021/03/23
- [PATCH v3 3/9] simplebench/bench-backup: add --compressed option, Vladimir Sementsov-Ogievskiy, 2021/03/23
- [PATCH v3 6/9] simplebench/bench-backup: support qcow2 source files, Vladimir Sementsov-Ogievskiy, 2021/03/23
- [PATCH v3 2/9] simplebench: bench_one(): support count=1, Vladimir Sementsov-Ogievskiy, 2021/03/23
- [PATCH v3 8/9] simplebench/bench-backup: add --drop-caches argument,
Vladimir Sementsov-Ogievskiy <=
- [PATCH v3 9/9] MAINTAINERS: update Benchmark util: add git tree, Vladimir Sementsov-Ogievskiy, 2021/03/23