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.. This work is licensed under a Creative Commons Attribution 4.0 International
.. License.
.. http://creativecommons.org/licenses/by/4.0
.. (c) OPNFV, Ericsson AB and others.
*************************************
Yardstick Test Case Description TC010
*************************************
.. _man-pages: http://manpages.ubuntu.com/manpages/trusty/lat_mem_rd.8.html
+-----------------------------------------------------------------------------+
|Memory Latency |
| |
+--------------+--------------------------------------------------------------+
|test case id | OPNFV_YARDSTICK_TC010_Memory Latency |
| | |
+--------------+--------------------------------------------------------------+
|metric | Latency in nanoseconds |
| | |
+--------------+--------------------------------------------------------------+
|test purpose | Measure the memory read latency for varying memory sizes and |
| | strides. Whole memory hierarchy is measured including all |
| | levels of cache. |
| | |
+--------------+--------------------------------------------------------------+
|configuration | File: opnfv_yardstick_tc010.yaml |
| | |
| | * SLA (max_latency): 30 nanoseconds |
| | * Stride - 128 bytes |
| | * Stop size - 64 megabytes |
| | * Iterations: 10 - test is run 10 times iteratively. |
| | * Interval: 1 - there is 1 second delay between each |
| | iteration. |
| | |
+--------------+--------------------------------------------------------------+
|test tool | Lmbench |
| | |
| | Lmbench is a suite of operating system microbenchmarks. This |
| | test uses lat_mem_rd tool from that suite. |
| | Lmbench is not always part of a Linux distribution, hence it |
| | needs to be installed in the test image |
| | |
+--------------+--------------------------------------------------------------+
|references | man-pages_ |
| | |
| | McVoy, Larry W.,and Carl Staelin. "lmbench: Portable Tools |
| | for Performance Analysis." USENIX annual technical |
| | conference 1996. |
| | |
+--------------+--------------------------------------------------------------+
|applicability | Test can be configured with different: |
| | |
| | * strides; |
| | * stop_size; |
| | * iterations and intervals. |
| | |
| | There are default values for each above-mentioned option. |
| | |
| | SLA (optional) : max_latency: The maximum memory latency |
| | that is accepted. |
| | |
+--------------+--------------------------------------------------------------+
|pre-test | The test case image needs to be installed into Glance |
|conditions | with Lmbench included in the image. |
| | |
| | No POD specific requirements have been identified. |
| | |
+--------------+--------------------------------------------------------------+
|test sequence | description and expected result |
| | |
+--------------+--------------------------------------------------------------+
|step 1 | The host is installed as client. Lmbench's lat_mem_rd tool |
| | is invoked and logs are produced and stored. |
| | |
| | Result: logs are stored. |
| | |
+--------------+--------------------------------------------------------------+
|test verdict | Test fails if the measured memory latency is above the SLA |
| | value or if there is a test case execution problem. |
| | |
+--------------+--------------------------------------------------------------+
|
