Can't seem to get off-heap memory working right...

[javadevmtl]

Using Ignite 1.3.0 with Java 1.8_45 on Ubuntu 14.04

Writing a micro service using vertx.io. I can't seem to get the performance
right with off_heap memory.

I have the following cache....

private static IgniteCache<String, HashSet&lt;String>> cache;

And it's configured as follows during application startup...

IgniteConfiguration igniteCfg = new IgniteConfiguration();
igniteCfg.setMarshaller(new OptimizedMarshaller(true));
                                                        
CacheConfiguration<String, HashSet&lt;String>> myCfg = new
CacheConfiguration<>("cache");
myCfg.setCacheMode(CacheMode.PARTITIONED);
myCfg.setAtomicityMode(CacheAtomicityMode.ATOMIC);
myCfg.setMemoryMode(CacheMemoryMode.OFFHEAP_TIERED);
myCfg.setOffHeapMaxMemory(16 * 1024L * 1024L * 1024L);
myCfg.setBackups(0);
                                                        
ignite = Ignition.start(igniteCfg);                                     
cache = ignite.getOrCreateCache("cache");

Inside my "web/http" handler I have...

String key = body.getString("key");     
String value = body.getString("value");
HashSet<String> values = cache.get(key);

if(values == null)
{
        values = new HashSet<String>();
}

values.add(value);
cache.put(key, values);
myWebHandler.reply(new JsonObject().put(key, values.size()));


I start my application with -Xmx1g.
At about 2 million records the application becomes extremely slow. I.e: It
goes from 12K requests/sec to not even 30 requests/sec.

If I start with -Xmx2g then I can go to about double the records (4 million)
before it gets unresponsive. 
-Xmx3g can go to 6 million and so on...

So it doesn't seem that off-heap is used. I'm I configuring something wrong?
Or is off-heap used but it's that much slower?




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