Re: pgbench duration option

Alvaro Herrera <alvherre@commandprompt.com> writes:
> Greg Smith wrote:
>> Last time I tried to quantify the overhead of logging with timestamps on 
>> I couldn't even measure its impact, it was lower than the usual pgbench  
>> noise.

> There's a hardware deficiency on certain machines -- I think it's old
> ones.  I don't know if machines that would currently be used in
> production would contain such a problem.

My understanding is that it's basically "cheap PC hardware" (with clock
interfaces based on old ISA bus specs) that has the issue in a
significant way.  I wouldn't expect you to see it on a serious database
server.  But lots of people still do development on cheap PC hardware,
which is why I think this is worth worrying about.
        regards, tom lane