Can someone please explain what the JVM option
-XX:ReservedCodeCacheSize=32m Reserved code cache size (in bytes) - maximum code cache size. [Solaris 64-bit, amd64, and -server x86: 2048m; in 1.5.0_06 and earlier, Solaris 64-bit and and64: 1024m.]
InitialCodeCacheSize) is an option for the (just-in-time) compiler of the Java Hotspot VM. Basically it sets the maximum size for the compiler's code cache.
The cache can become full, which results in warnings like the following:
Java HotSpot(TM) 64-Bit Server VM warning: CodeCache is full. Compiler has been disabled. Java HotSpot(TM) 64-Bit Server VM warning: Try increasing the code cache size using -XX:ReservedCodeCacheSize= Code Cache [0x000000010958f000, 0x000000010c52f000, 0x000000010c58f000) total_blobs=15406 nmethods=14989 adapters=362 free_code_cache=835Kb largest_free_block=449792
It's much worse when followed by
Java HotSpot(TM) Client VM warning: Exception java.lang.OutOfMemoryError occurred dispatching signal SIGINT to handler- the VM may need to be forcibly terminated.
When to set this option?
Normally you'd not change this value. I think the default values are quite good balanced because this problems occur on very rare occasions only (in my experince).