Re: Huge performance loss when processing lots of data
- From: Mike Pall <mike-1207@xxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 3 Jul 2012 20:31:47 +0200
Chris wrote:
> I have sample code that shows the problem here:
> http://luadev.com/uploads/slowdata01.lua
Quoting http://luajit.org/ext_ffi_api.html#ffi_new
"Please note that an anonymous struct declaration implicitly
creates a new and distinguished ctype every time you use it for
ffi.new(). This is probably not what you want, especially if you
create more than one cdata object. Different anonymous structs
are not considered assignment-compatible by the C standard, even
though they may have the same fields! Also, they are considered
different types by the JIT-compiler, which may cause an
excessive number of traces. It's strongly suggested to either
declare a named struct or typedef with ffi.cdef() or to create a
single ctype object for an anonymous struct with ffi.typeof()."
--Mike
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