Re: Cost of XLogInsert CRC calculations

Tom Lane wrote:
> Greg Stark <gsstark@mit.edu> writes:
> > Tom Lane <tgl@sss.pgh.pa.us> writes:
> >> Do we know that?  The results I showed put at least one fundamentally
> >> 32bit platform (the PowerBook I'm typing this on) at dead par for 32bit
> >> and 64bit CRCs.  
> 
> > Wait, par for 32-bit CRCs? Or for 64-bit CRCs calculated using 32-bit ints?
> 
> Right, the latter.  We haven't actually tried to measure the cost of
> plain 32bit CRCs... although I seem to recall that when we originally
> decided to use 64bit, someone put up some benchmarks purporting to
> show that there wasn't much difference.

OK, thanks. I didn't know that.

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
359-1001+  If your life is a hard drive,     |  13 Roberts Road +  Christ can be your backup.        |  Newtown Square,
Pennsylvania19073