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performance-metrics: Add QCOW2 write micro benchmark

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Add micro_bench_qcow_write which times write_vectored calls through
QcowSync on an empty QCOW2 image. Each write allocates a new cluster
exercising map_cluster_for_write with L2 entry allocation and refcount
updates followed by pwrite_all.

Two TEST_LIST entries: micro_block_qcow_write_128_us and
micro_block_qcow_write_256_us with 128 and 256 cluster workloads.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2026-03-26 20:19:46 +01:00
committed by Rob Bradford
parent 9f317895b5
commit f7e40eec9a
2 changed files with 52 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; 64] = [
const TEST_LIST: [PerformanceTest; 66] = [
PerformanceTest {
name: "boot_time_ms",
func_ptr: performance_boot_time,
@@ -1277,6 +1277,30 @@ const TEST_LIST: [PerformanceTest; 64] = [
},
unit_adjuster: adjuster::s_to_us,
},
PerformanceTest {
name: "micro_block_qcow_write_128_us",
func_ptr: micro_bench_block::micro_bench_qcow_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_write_256_us",
func_ptr: micro_bench_block::micro_bench_qcow_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(