core/src/main/java/com/orientechnologies/common/util/OMemory.java
public static void checkCacheMemoryConfiguration() {
    final long maxHeapSize = Runtime.getRuntime().maxMemory();
    final long maxCacheSize = getMaxCacheMemorySize();
    final ONative.MemoryLimitResult physicalMemory = ONative.instance().getMemoryLimit(false);

    if (maxHeapSize != Long.MAX_VALUE && physicalMemory != null && maxHeapSize + maxCacheSize > physicalMemory.memoryLimit)
      OLogManager.instance().warnNoDb(OMemory.class,
          "The sum of the configured JVM maximum heap size (" + maxHeapSize + " bytes) " + "and the OrientDB maximum cache size ("
              + maxCacheSize + " bytes) is larger than the available physical memory size " + "(" + physicalMemory
              + " bytes). That may cause out of memory errors, please tune the configuration up. Use the "
              + "-Xmx JVM option to lower the JVM maximum heap memory size or storage.diskCache.bufferSize OrientDB option to "
              + "lower memory requirements of the cache.");
  }
public static void checkCacheMemoryConfiguration() {
    final long maxHeapSize = Runtime.getRuntime().maxMemory();
    final long maxCacheSize = getMaxCacheMemorySize();
    final ONative.MemoryLimitResult physicalMemory = ONative.instance().getMemoryLimit(false);

    if (maxHeapSize != Long.MAX_VALUE && physicalMemory != null && maxHeapSize + maxCacheSize > physicalMemory.memoryLimit)
      OLogManager.instance().warnNoDb(OMemory.class,
          "The sum of the configured JVM maximum heap size (" + maxHeapSize + " bytes) " + "and the OrientDB maximum cache size ("
              + maxCacheSize + " bytes) is larger than the available physical memory size " + "(" + physicalMemory
              + " bytes). That may cause out of memory errors, please tune the configuration up. Use the "
              + "-Xmx JVM option to lower the JVM maximum heap memory size or storage.diskCache.bufferSize OrientDB option to "
              + "lower memory requirements of the cache.");
  }
Checks the OrientDB cache memory configuration and emits a warning if configuration is invalid.