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57 lines
1.9 KiB
57 lines
1.9 KiB
TEST SUITE:
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The directory io-throttle contains the tests related to block device I/O
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bandwdith controller.
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More testcases are expected to be added in future.
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TESTS AIM:
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The aim of the tests is to check the block device I/O throttling functionality
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for cgroups.
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FILES DESCRIPTION:
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iobw.c
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---------------
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Simple benchmark to generate parallel streams of direct I/O (O_DIRECT). This
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benchmark fork()s one task per stream. Each task creates a separate file in the
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current working directory, fills it with data using O_DIRECT writes and re-read
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the whole file always in O_DIRECT mode. Different timestamps are used to
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evaluate per-task I/O rate and total I/O rate (seen by the parent).
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myfunctions.sh
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----------
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This file contains the functions which are common for the io-throttle tests.
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For ex. the setup and cleanup functions which do the setup for running the
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test and do the cleanup once the test finishes. The setup() function creates
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/dev/blockioctl directory and mounts cgroup filesystem on it with memory
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controller. It then creates a number(n) of groups in /dev/blockioctl. The
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cleanup function does a complete cleanup of the system.
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Most of the error scenarios have been taken care of for a sane cleanup of the
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system. However if cleanup fails in any case, just manually execute the
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commands written in cleanup function in myfunctions.sh.
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One of the most common causes of failed cleanup is that you have done cd into
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any of the groups in controller dir tree.
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run_io_throttle_test.sh
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------------------
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This script creates different scenarios for I/O bandwidth controller testing
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and fires (n) tasks in different groups to write and read different I/O streams
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etc. It waits for the return status from tasks and reports test pass/fail
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accordingly.
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Makefile
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--------
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The usual makefile for this directory
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PASS/FAIL CRITERION:
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==================
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The test cases are intelligent enough in deciding the pass or failure of a
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test.
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README:
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--------
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This file.
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