On 24.06.2020 08:45, Andrey Shinkevich wrote:
The script 'bench_write_req.py' allows comparing performances of write
request for two qemu-img binary files.
Suggested-by: Denis V. Lunev <d...@openvz.org>
Suggested-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkev...@virtuozzo.com>
---
scripts/simplebench/bench_write_req.py | 150 +++++++++++++++++++++++++++++++++
1 file changed, 150 insertions(+)
create mode 100755 scripts/simplebench/bench_write_req.py
diff --git a/scripts/simplebench/bench_write_req.py
b/scripts/simplebench/bench_write_req.py
new file mode 100755
index 0000000..e127dcc
--- /dev/null
+++ b/scripts/simplebench/bench_write_req.py
@@ -0,0 +1,150 @@
+#!/usr/bin/env python3
...
+ # Test-cases are "rows" in benchmark resulting table, 'id' is a caption
+ # for the row, other fields are handled by bench_func.
+ test_cases = [
+ {
+ 'id': '<cluster middle>',
+ 'block_size': 4096,
+ 'block_offset': 524288,
+ 'requests': 100
s/100/10/
+ },
+ {
+ 'id': '<cluster overlap>',
+ 'block_size': 524288,
+ 'block_offset': 4096,
+ 'requests': 10
s/10/2/
+ },
+ ]
I reduced the number of requests per the test case to make the script
runtime more reasonable for HDD device and got the following results:
qemu-img1 is the current version of QEMU
qemu-img2 is the current version but without the feature "[PATCH v14
1/1] qcow2: skip writing zero buffers to empty COW areas" (git commit
ID: c8bb23cbdbe32f5)
SSD:
$ time ./scripts/simplebench/bench_write_req.py ./qemu-img1 ./qemu-img2
image.qcow2
Testing 1/4: <qemu-img binary 1> :: <cluster middle>
#run 1
{'seconds': 0.377}
#run 2
{'seconds': 0.382}
#run 3
{'seconds': 0.376}
Testing 2/4: <qemu-img binary 1> :: <cluster overlap>
#run 1
{'seconds': 6.836}
#run 2
{'seconds': 8.513}
#run 3
{'seconds': 6.843}
Testing 3/4: <qemu-img binary 2> :: <cluster middle>
#run 1
{'seconds': 11.46}
#run 2
{'seconds': 8.734}
#run 3
{'seconds': 8.579}
Testing 4/4: <qemu-img binary 2> :: <cluster overlap>
#run 1
{'seconds': 11.848}
#run 2
{'seconds': 17.8}
#run 3
{'seconds': 19.822}
Done
----------------- ------------------- -------------------
<qemu-img binary 1> <qemu-img binary 2>
<cluster middle> 0.38 +- 0.00 9.59 +- 1.87
<cluster overlap> 7.40 +- 1.12 16.49 +- 4.64
----------------- ------------------- -------------------
real 1m43.769s
user 0m1.881s
sys 0m4.677s
HDD:
$ sudo time ./scripts/simplebench/bench_write_req.py ./qemu-img1
./qemu-img2 /vz/tmp/image.qcow2
Testing 1/4: <qemu-img binary 1> :: <cluster middle>
#run 1
{'seconds': 54.738}
#run 2
{'seconds': 57.049}
#run 3
{'seconds': 58.199}
Testing 2/4: <qemu-img binary 1> :: <cluster overlap>
#run 1
{'seconds': 12.846}
#run 2
{'seconds': 11.015}
#run 3
{'seconds': 11.11}
Testing 3/4: <qemu-img binary 2> :: <cluster middle>
#run 1
{'seconds': 53.969}
#run 2
{'seconds': 58.22}
#run 3
{'seconds': 61.413}
Testing 4/4: <qemu-img binary 2> :: <cluster overlap>
#run 1
{'seconds': 15.702}
#run 2
{'seconds': 12.627}
#run 3
{'seconds': 11.879}
Done
----------------- ------------------- -------------------
<qemu-img binary 1> <qemu-img binary 2>
<cluster middle> 56.66 +- 1.92 57.87 +- 3.90
<cluster overlap> 11.66 +- 1.19 13.40 +- 2.30
----------------- ------------------- -------------------
3.31user 7.93system 7:03.13elapsed 2%CPU (0avgtext+0avgdata
78280maxresident)k
50240inputs+22659372outputs (0major+965543minor)pagefaults 0swaps
Andrey
