Atsushi Ogawa <[EMAIL PROTECTED]> writes:
> (1)accounts table (4 columns, 1,000,000 tuples)
>           malloc calls   allocated(bytes)   unused(bytes)  execution time
> --------------------------------------------------------------------------
> 8.1.0           80,542        164,950,016       2,946,402       6.80 sec.
> patched             86        161,478,656         177,650       6.73 sec.

This hardly seems credible --- your patch would result in more wasted
memory, not less.  It looks to me like the instrumentation you added
assumes that extra space in a malloc block will never be used later,
which of course is not true ...

                        regards, tom lane

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