148 lines
4.8 KiB
Diff
148 lines
4.8 KiB
Diff
From 315948e75e06d038bd8afa319a41e3fde33b4174 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Thu, 29 Jul 2021 20:16:43 +0100
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Subject: [PATCH] tests: cache: Test cache-on-read option really caches
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By making use of the delay filter to add a penalty for hitting the
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plugin we can check whether or not the cache-on-read option is
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working.
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(cherry picked from commit 3ae7aa533bb9322ab6dc6deecb687ded76634ab4)
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---
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tests/Makefile.am | 2 +
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tests/test-cache-on-read-caches.sh | 87 ++++++++++++++++++++++++++++++
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tests/test-cache-on-read.sh | 5 --
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3 files changed, 89 insertions(+), 5 deletions(-)
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create mode 100755 tests/test-cache-on-read-caches.sh
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diff --git a/tests/Makefile.am b/tests/Makefile.am
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index a038eabc..51ca913a 100644
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--- a/tests/Makefile.am
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+++ b/tests/Makefile.am
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@@ -1373,6 +1373,7 @@ TESTS += \
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test-cache.sh \
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test-cache-block-size.sh \
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test-cache-on-read.sh \
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+ test-cache-on-read-caches.sh \
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test-cache-max-size.sh \
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test-cache-unaligned.sh \
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$(NULL)
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@@ -1380,6 +1381,7 @@ EXTRA_DIST += \
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test-cache.sh \
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test-cache-block-size.sh \
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test-cache-on-read.sh \
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+ test-cache-on-read-caches.sh \
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test-cache-max-size.sh \
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test-cache-unaligned.sh \
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$(NULL)
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diff --git a/tests/test-cache-on-read-caches.sh b/tests/test-cache-on-read-caches.sh
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new file mode 100755
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index 00000000..80b34159
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--- /dev/null
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+++ b/tests/test-cache-on-read-caches.sh
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@@ -0,0 +1,87 @@
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+#!/usr/bin/env bash
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+# nbdkit
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+# Copyright (C) 2018-2021 Red Hat Inc.
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+#
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+# Redistribution and use in source and binary forms, with or without
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+# modification, are permitted provided that the following conditions are
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+# met:
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+#
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+# * Redistributions of source code must retain the above copyright
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+# notice, this list of conditions and the following disclaimer.
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+#
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+# * Redistributions in binary form must reproduce the above copyright
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+# notice, this list of conditions and the following disclaimer in the
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+# documentation and/or other materials provided with the distribution.
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+#
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+# * Neither the name of Red Hat nor the names of its contributors may be
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+# used to endorse or promote products derived from this software without
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+# specific prior written permission.
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+#
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+# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
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+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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+# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
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+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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+# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+# SUCH DAMAGE.
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+
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+source ./functions.sh
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+set -e
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+set -x
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+
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+requires_filter cache
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+requires_filter delay
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+requires_nbdsh_uri
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+
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+sock=$(mktemp -u /tmp/nbdkit-test-sock.XXXXXX)
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+files="$sock cache-on-read-caches.pid"
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+rm -f $files
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+cleanup_fn rm -f $files
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+
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+# Run nbdkit with the cache filter, cache-on-read and a read delay.
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+start_nbdkit -P cache-on-read-caches.pid -U $sock \
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+ --filter=cache --filter=delay \
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+ memory 64K cache-on-read=true rdelay=10
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+
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+nbdsh --connect "nbd+unix://?socket=$sock" \
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+ -c '
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+from time import time
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+
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+# First read should suffer a penalty. Because we are reading
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+# a single 64K block (same size as the cache block), we should
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+# only suffer one penalty of approx. 10 seconds.
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+st = time()
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+zb = h.pread(65536, 0)
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+et = time()
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+el = et-st
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+print("elapsed time: %g" % el)
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+assert et-st >= 10
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+assert zb == bytearray(65536)
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+
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+# Second read should not suffer a penalty.
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+st = time()
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+zb = h.pread(65536, 0)
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+et = time()
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+el = et-st
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+print("elapsed time: %g" % el)
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+assert el < 10
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+assert zb == bytearray(65536)
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+
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+# Write something.
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+buf = b"abcd" * 16384
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+h.pwrite(buf, 0)
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+
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+# Reading back should be quick since it is stored in the overlay.
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+st = time()
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+buf2 = h.pread(65536, 0)
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+et = time()
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+el = et-st
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+print("elapsed time: %g" % el)
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+assert el < 10
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+assert buf == buf2
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+'
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diff --git a/tests/test-cache-on-read.sh b/tests/test-cache-on-read.sh
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index f8584dcd..85ca83d4 100755
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--- a/tests/test-cache-on-read.sh
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+++ b/tests/test-cache-on-read.sh
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@@ -56,9 +56,4 @@ zero = h.pread(32768, 0)
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assert zero == bytearray(32768)
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buf2 = h.pread(65536, 32768)
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assert buf == buf2
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-
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-# XXX Suggestion to improve this test: Use the delay filter below the
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-# cache filter, and time reads to prove that the second read is faster
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-# because it is not going through the delay filter and plugin.
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-# XXX second h.pread here ...
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'
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--
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2.31.1
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