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