[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: ByteBuffer.allocateDirect ridiculously slow

[timfox]

It's a well known factor that direct bytebuffer allocation is much slower than non direct byte buffers.

If you think about it when you allocate a non direct byte buffer then it basically just needs to dereference a pointer to some memory on the Java heap, which is very quick. But for a direct buffer, it has to malloc real memory from the OS, and do a bunch of other house keeping.

So yes, if you're using direct byte buffers it pays to re-use them.

You should speak to Trustin about this. I believe Netty uses non direct buffers for exactly this reason.

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