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Re: Explain buffers display units.

From: Greg Smith <greg(at)2ndquadrant(dot)com>
To: Greg Stark <stark(at)mit(dot)edu>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, "<pgsql-hackers(at)postgresql(dot)org>" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Explain buffers display units.
Date: 2010-02-15 17:55:20
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Lists: pgsql-hackers
Greg Stark wrote:
> We can always continue tweak the details of the format such as adding
> spaces before the units to make it similar to the pg_size_pretty().
> I'm not sure I like the idea of making it exactly equivalent because
> pg_size_pretty() doesn't print any decimals so it's pretty imprecise
> for smaller values.

That's a reasonable position; I'd be fine with upgrading the 
requirements for a text scraping app to handle either "8 kB" or "1.356 
kB" if it wanted to share some code to consume either type of info, if 
all you did was throw a space in there.  I'd suggest either removing the 
PB units support from your implementation, or adding it to 
pg_size_pretty, just to keep those two routines more like one another in 
terms of what they might produce as output given the same scale of input.

Also, a quick comment in the new code explaining what you just said 
above might be helpful, just to preempt a similar "how is this different 
from pg_size_pretty?" question from popping up again one day.

Greg Smith  2ndQuadrant US  Baltimore, MD
PostgreSQL Training, Services and Support

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