test: add some tests for seq and rand offsets

t/jobs/t0019.fio is a seq read test
t/jobs/t0020.fio is a rand read test

We don't have any automated tests which make sure that sequential access
patterns are actually sequential and that random access patterns are not
sequential. Add these two tests to help detect the possibility that
these features could break.

Signed-off-by: Vincent Fu <vincent.fu@samsung.com>

diff --git a/t/jobs/t0019.fio b/t/jobs/t0019.fio
new file mode 100644 (file)
index 0000000..b60d27d
--- /dev/null
+++ b/t/jobs/t0019.fio
@@ -0,0 +1,10 @@
+# Expected result: offsets are accessed sequentially and all offsets are read
+# Buggy result: offsets are not accessed sequentially and one or more offsets are missed
+# run with --debug=io or logging to see which offsets are accessed
+
+[test]
+ioengine=null
+filesize=1M
+write_bw_log=test
+per_job_logs=0
+log_offset=1

diff --git a/t/jobs/t0020.fio b/t/jobs/t0020.fio
new file mode 100644 (file)
index 0000000..1c1c516
--- /dev/null
+++ b/t/jobs/t0020.fio
@@ -0,0 +1,11 @@
+# Expected result: offsets are not accessed sequentially and all offsets are touched
+# Buggy result: offsets are accessed sequentially and one or more offsets are missed
+# run with --debug=io or logging to see which offsets are read
+
+[test]
+ioengine=null
+filesize=1M
+rw=randread
+write_bw_log=test
+per_job_logs=0
+log_offset=1

diff --git a/t/run-fio-tests.py b/t/run-fio-tests.py
index 1e5e9f249f10cd0a9a3e5ed1a95bebc020d26862..78f435211c9cc23b1f7fd9c6c39ce46768a82a43 100755 (executable)
--- a/t/run-fio-tests.py
+++ b/t/run-fio-tests.py
@@ -548,6 +548,72 @@ class FioJobTest_t0015(FioJobTest):
             self.passed = False
 
 
+class FioJobTest_t0019(FioJobTest):
+    """Test consists of fio test job t0019
+    Confirm that all offsets were touched sequentially"""
+
+    def check_result(self):
+        super(FioJobTest_t0019, self).check_result()
+
+        bw_log_filename = os.path.join(self.test_dir, "test_bw.log")
+        file_data, success = self.get_file(bw_log_filename)
+        log_lines = file_data.split('\n')
+
+        prev = -4096
+        for line in log_lines:
+            if len(line.strip()) == 0:
+                continue
+            cur = int(line.split(',')[4])
+            if cur - prev != 4096:
+                self.passed = False
+                self.failure_reason = "offsets {0}, {1} not sequential".format(prev, cur)
+                return
+            prev = cur
+
+        if cur/4096 != 255:
+            self.passed = False
+            self.failure_reason = "unexpected last offset {0}".format(cur)
+
+
+class FioJobTest_t0020(FioJobTest):
+    """Test consists of fio test job t0020
+    Confirm that almost all offsets were touched non-sequentially"""
+
+    def check_result(self):
+        super(FioJobTest_t0020, self).check_result()
+
+        bw_log_filename = os.path.join(self.test_dir, "test_bw.log")
+        file_data, success = self.get_file(bw_log_filename)
+        log_lines = file_data.split('\n')
+
+        seq_count = 0
+        offsets = set()
+
+        prev = int(log_lines[0].split(',')[4])
+        for line in log_lines[1:]:
+            offsets.add(prev/4096)
+            if len(line.strip()) == 0:
+                continue
+            cur = int(line.split(',')[4])
+            if cur - prev == 4096:
+                seq_count += 1
+            prev = cur
+
+        # 10 is an arbitrary threshold
+        if seq_count > 10:
+            self.passed = False
+            self.failure_reason = "too many ({0}) consecutive offsets".format(seq_count)
+
+        if len(offsets) != 256:
+            self.passed = False
+            self.failure_reason += " number of offsets is {0} instead of 256".format(len(offsets))
+
+        for i in range(256):
+            if not i in offsets:
+                self.passed = False
+                self.failure_reason += " missing offset {0}".format(i*4096)
+
+
 class FioJobTest_iops_rate(FioJobTest):
     """Test consists of fio test job t0009
     Confirm that job0 iops == 1000
@@ -889,6 +955,24 @@ TEST_LIST = [
         'pre_success':      None,
         'requirements':     [Requirements.linux, Requirements.io_uring],
     },
+    {
+        'test_id':          19,
+        'test_class':       FioJobTest_t0019,
+        'job':              't0019.fio',
+        'success':          SUCCESS_DEFAULT,
+        'pre_job':          None,
+        'pre_success':      None,
+        'requirements':     [],
+    },
+    {
+        'test_id':          20,
+        'test_class':       FioJobTest_t0020,
+        'job':              't0020.fio',
+        'success':          SUCCESS_DEFAULT,
+        'pre_job':          None,
+        'pre_success':      None,
+        'requirements':     [],
+    },
     {
         'test_id':          1000,
         'test_class':       FioExeTest,