franz1981 commented on issue #2646: ARTEMIS-2317 Reuse file buffer wrapper instances to reduce allocations URL: https://github.com/apache/activemq-artemis/pull/2646#issuecomment-487007870 The speed of `Page::read` has been measured by a handrolled test added on `org.apache.activemq.artemis.tests.unit.core.paging.impl.PageTest`: ```java @Test public void testReadSpeedWithNIO() throws Exception { recreateDirectory(getTestDir()); NIOSequentialFileFactory factory = new NIOSequentialFileFactory(getTestDirfile(), 1); SequentialFile file = factory.createSequentialFile("00010.page"); Page impl = new Page(new SimpleString("something"), new NullStorageManager(), factory, file, 10); Assert.assertEquals(10, impl.getPageId()); impl.open(); Assert.assertEquals(1, factory.listFiles("page").size()); SimpleString simpleDestination = new SimpleString("Test"); final int numberOfElements = 10 * 1024 * 1024 / 100; addPageElements(simpleDestination, impl, numberOfElements); final int fileSize = impl.getSize(); System.out.println("fileSize = " + fileSize); impl.sync(); impl.close(); file = factory.createSequentialFile("00010.page"); file.open(); impl = new Page(new SimpleString("something"), new NullStorageManager(), factory, file, 10); final int tests = 10; final int times = 100; NullStorageManager manager = new NullStorageManager(); for( int t = 0; t<tests;t++) { long totalTime = 0; for (int m = 0; m<times;m++) { final long start = System.nanoTime(); List<PagedMessage> msgs = impl.read(manager); final long elapsed = System.nanoTime() - start; totalTime+=elapsed; Assert.assertEquals(numberOfElements, msgs.size()); Assert.assertEquals(numberOfElements, impl.getNumberOfMessages()); for (int i = 0; i < msgs.size(); i++) { Assert.assertEquals(simpleDestination, msgs.get(i).getMessage().getAddressSimpleString()); } } final long totalBytes = fileSize * times; final long megaPerSec = (totalBytes * 1000L)/ totalTime; System.out.println(megaPerSec + " MB/sec"); System.gc(); } impl.delete(null); Assert.assertEquals(0, factory.listFiles(".page").size()); } ``` Although it is a naive one, this test stress the best case scenario of `Page::read` ie when a file page is already into the OS page cache.
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