我的jboss 7.1.6 eap部署 -Xmx8g 虚拟机上的物理ram设置为12 gb。在初始化apache ignite缓存时，会出现一条日志消息：
stdout:71 - [08:54:52]在本地计算机上启动的节点需要80%以上的物理ram，这可能会由于交换而导致显著减速（请减小jvm堆大小、数据区域大小或检查点缓冲区大小）[必需=10662mb，可用=11834mb]
我完全以编程方式使用ignite，而不是使用持久性。这是我的密码：

System.setProperty("IGNITE_UPDATE_NOTIFIER", "false");

igniteConfiguration = new IgniteConfiguration();

int failureDetectionTimeout = Integer.parseInt(getProperty("IGNITE_TCP_DISCOVERY_FAILURE_DETECTION_TIMEOUT", "60000"));

igniteConfiguration.setFailureDetectionTimeout(failureDetectionTimeout);

String igniteVmIps = getProperty("IGNITE_VM_IPS");
List<String> addresses = Arrays.asList("127.0.0.1:47500");
if (StringUtils.isNotBlank(igniteVmIps)) {
    addresses = Arrays.asList(igniteVmIps.split(","));
}

int networkTimeout = Integer.parseInt(getProperty("IGNITE_TCP_DISCOVERY_NETWORK_TIMEOUT", "60000"));
boolean failureDetectionTimeoutEnabled = Boolean.parseBoolean(getProperty("IGNITE_TCP_DISCOVERY_FAILURE_DETECTION_TIMEOUT_ENABLED", "true"));

int tcpDiscoveryLocalPort = Integer.parseInt(getProperty("IGNITE_TCP_DISCOVERY_LOCAL_PORT", "47500"));
int tcpDiscoveryLocalPortRange = Integer.parseInt(getProperty("IGNITE_TCP_DISCOVERY_LOCAL_PORT_RANGE", "0"));

TcpDiscoverySpi tcpDiscoverySpi = new TcpDiscoverySpi();
tcpDiscoverySpi.setLocalPort(tcpDiscoveryLocalPort);
tcpDiscoverySpi.setLocalPortRange(tcpDiscoveryLocalPortRange);
tcpDiscoverySpi.setNetworkTimeout(networkTimeout);
tcpDiscoverySpi.failureDetectionTimeoutEnabled(failureDetectionTimeoutEnabled);
TcpDiscoveryVmIpFinder ipFinder = new TcpDiscoveryVmIpFinder();
ipFinder.setAddresses(addresses);
tcpDiscoverySpi.setIpFinder(ipFinder);

igniteConfiguration.setDiscoverySpi(tcpDiscoverySpi);

Ignite ignite = Ignition.start(igniteConfiguration);

ignite.cluster().active(true);

// later, initialize my caches
String cacheName = cacheEnum.name();
CacheConfiguration<String, byte[]> cacheCfg = new CacheConfiguration<>(cacheName);
int maxSize = Integer.parseInt(StringUtils.defaultIfBlank(
        PropertyHelper.lookupProperty(String.format(CACHE_SETTING_FORMAT, cacheName, ObjectCacheConstants.SETTING_MAX_SIZE)),
        String.valueOf(ObjectCacheConstants.SETTING_MAX_SIZE_DEFAULT)));
long expiresAfterMs = Long.parseLong(StringUtils.defaultIfBlank(
        PropertyHelper.lookupProperty(String.format(CACHE_SETTING_FORMAT, cacheName, ObjectCacheConstants.SETTING_EXPIRES_MS)),
        String.valueOf(ObjectCacheConstants.SETTING_EXPIRES_MS_DEFAULT)));

cacheCfg.setCacheMode(CacheMode.REPLICATED);
cacheCfg.setAtomicityMode(CacheAtomicityMode.ATOMIC);
cacheCfg.setBackups(1);

cacheCfg.setOnheapCacheEnabled(true);
cacheCfg.setEvictionPolicyFactory(new LruEvictionPolicyFactory<String, byte[]>(maxSize));

Optional<CreatedExpiryPolicy> expiryPolicy = Optional.empty();
if (expiresAfterMs > 0) {
    expiryPolicy = Optional.of(new CreatedExpiryPolicy(new Duration(TimeUnit.MILLISECONDS, expiresAfterMs)));
}

我在google上搜索过这个警告，但是我找到的所有解决方案都涉及到更新持久性设置，但是我没有使用持久性。
在我的例子中，没有缓存，我们可以在2gb堆上运行没有问题。所以我留下6gb用于缓存，这应该足够了。我想设置它，使我的jvm使用最多6g的ram，而不是更多。
为了使我的程序获得适当的ram利用率，我应该改变哪些字段？