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/*
* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "runtime/icache.hpp"
#include "runtime/os.hpp"
#include "testutils.hpp"
#include "unittest.hpp"
TEST_VM(ICacheTest, flush_perf) {
// Warmup infra a little.
{
address p = (address)os::malloc(1024, mtTest);
ICache::invalidate_range(p, 1024);
os::free(p);
}
const int ITERS = 1000;
for (int size = 256; size <= 256*1024; size *= 2) {
address p = (address)os::malloc(size, mtTest);
EXPECT_NOT_NULL(p);
jlong total_flush = 0;
jlong total_readback = 0;
for (int t = 0; t < ITERS; t++) {
// Force writes to mark cache lines modified.
memset(p, 1, size);
jlong time1 = os::javaTimeNanos();
// Flush the cache under the memory.
ICache::invalidate_range(p, size);
jlong time2 = os::javaTimeNanos();
// Read memory back.
EXPECT_NULL(memchr(p, 0, size));
jlong time3 = os::javaTimeNanos();
total_flush += time2 - time1;
total_readback += time3 - time2;
}
tty->print_cr("%10d bytes flushed in " JLONG_FORMAT_W(10) " ns, read back in " JLONG_FORMAT_W(10) " ns",
size, total_flush / ITERS, total_readback / ITERS);
os::free(p);
}
}
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