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performance-metrics: Add QCOW2 backing file performance test

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Add sequential and random read performance tests for QCOW2 overlays
with QCOW2 backing files.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2025-12-15 20:14:50 +01:00
committed by Bo Chen
parent d696cea024
commit d75bd1675c
2 changed files with 47 additions and 1 deletions
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performance-metrics/src/performance_tests.rs
+16
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@@ -33,6 +33,8 @@ enum Error {
// The test image cannot be created on tmpfs (e.g. /tmp) filesystem,
// as tmpfs does not support O_DIRECT
pub const BLK_IO_TEST_IMG: &str = "/var/tmp/ch-blk-io-test.img";
const QCOW2_BACKING_FILE: &str = "/var/tmp/ch-blk-io-test-qcow2-backing.qcow2";
pub const OVERLAY_WITH_QCOW2_BACKING: &str = "/var/tmp/ch-blk-io-test-overlay-qcow2.qcow2";
pub fn init_tests(overrides: &PerformanceTestOverrides) {
let mut cmd = format!("dd if=/dev/zero of={BLK_IO_TEST_IMG} bs=1M count=4096");
@@ -54,11 +56,25 @@ pub fn init_tests(overrides: &PerformanceTestOverrides) {
}
assert!(exec_host_command_output(&cmd).status.success());
// QCOW2 backing file for backing file tests
cmd = format!("qemu-img create -f qcow2 -o preallocation=full {QCOW2_BACKING_FILE} 4G");
assert!(exec_host_command_output(&cmd).status.success());
// QCOW2 overlay with QCOW2 backing
cmd = format!(
"qemu-img create -f qcow2 -b {QCOW2_BACKING_FILE} -F qcow2 {OVERLAY_WITH_QCOW2_BACKING} 4G"
);
assert!(exec_host_command_output(&cmd).status.success());
}
pub fn cleanup_tests() {
fs::remove_file(BLK_IO_TEST_IMG)
.unwrap_or_else(|_| panic!("Failed to remove file '{BLK_IO_TEST_IMG}'."));
fs::remove_file(QCOW2_BACKING_FILE)
.unwrap_or_else(|_| panic!("Failed to remove file '{QCOW2_BACKING_FILE}'."));
fs::remove_file(OVERLAY_WITH_QCOW2_BACKING)
.unwrap_or_else(|_| panic!("Failed to remove file '{OVERLAY_WITH_QCOW2_BACKING}'."));
}
// Performance tests are expected to be executed sequentially, so we can