On Fri, Jan 04, 2008 at 12:09:05AM +0800, Rahul Chopra wrote:

Can you please explain gdk_mem_bigsize and gdk_vm_minsize? I searched around on the site and I am not really clear on what the optimal settings for these are.

Memory blocks allocated via GDKmalloc and friends larger then gdk_mem_bigsize will be mmaped using virtual swap space (vmalloc). This is done to avoid fragmentation. BATs have heaps, these can be malloced (GDKmalloc), virtual mmapped using swap space (GDKvmalloc) or mmapped (needs a filename). Blocks (heaps) larger then vm_minsize will be vmalloced. The backends (sql/xquery) control when we switch to mmapped with files.

I am currently using the defaults, on a system with 8 GB of RAM.

It depends on your os if thats okay. Niels

Thanks,

Rahul

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