private static void ioSeqRead(final String file, int size) {
		long start = 0;
		try {
			FileInputStream fis = new FileInputStream(file);
			byte buf[] = new byte[1024];
			int cnt = 0;
			int n;
			int total = 1024 * size;
			
			start = System.currentTimeMillis();
			while ((n = fis.read(buf)) != -1) {
				size += n;
				if (size >= total) {
					break;
				}

			}
			fis.close();
		} catch (IOException e) {
			System.err.println(e);
		}
		logger.info("io seq read file " + size + "M cost: " + (System.currentTimeMillis() - start) + " ms");
	}