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performance-metrics: Add QCOW2 copy-on-write write micro benchmark

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Add micro_bench_qcow_cow_write which writes clusters into a QCOW2
overlay backed by a raw file.  Each write triggers copy-on-write:
cluster allocation, L2 and refcount table updates, then the data
write.  This measures COW allocation overhead compared to writing
into a plain empty image.

Workloads: 128 and 256 clusters.
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-03-26 21:13:09 +01:00
committed by Rob Bradford
parent 79b58c0faf
commit b2430d701b
2 changed files with 51 additions and 1 deletions
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26
performance-metrics/src/main.rs
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@@ -378,7 +378,7 @@ mod adjuster {
}
}
const TEST_LIST: [PerformanceTest; 74] = [
const TEST_LIST: [PerformanceTest; 76] = [
PerformanceTest {
name: "boot_time_ms",
func_ptr: performance_boot_time,
@@ -1397,6 +1397,30 @@ const TEST_LIST: [PerformanceTest; 74] = [
},
unit_adjuster: adjuster::s_to_us,
},
PerformanceTest {
name: "micro_block_qcow_cow_write_128_us",
func_ptr: micro_bench_block::micro_bench_qcow_cow_write,
control: PerformanceTestControl {
test_timeout: 10,
test_iterations: 20,
warmup_iterations: 5,
num_ops: Some(128),
..PerformanceTestControl::default()
},
unit_adjuster: adjuster::s_to_us,
},
PerformanceTest {
name: "micro_block_qcow_cow_write_256_us",
func_ptr: micro_bench_block::micro_bench_qcow_cow_write,
control: PerformanceTestControl {
test_timeout: 10,
test_iterations: 20,
warmup_iterations: 5,
num_ops: Some(256),
..PerformanceTestControl::default()
},
unit_adjuster: adjuster::s_to_us,
},
];
fn run_test_with_timeout(