Re: Expensive log_line_prefix ?

Sergey Konoplev <gray.ru@gmail.com> writes:
> On Thu, Oct 11, 2012 at 12:19 PM, Sahagian, David
> <david.sahagian@emc.com> wrote:
>> Are there any "extra" costs to logging all this cool stuff ?
>>
>> log_line_prefix = '%m %a %u %p %c %m %v %x'

> The formatting cost only but it is so insignificant that does not
> worth bothering with it.

IIRC, %m would imply a gettimeofday call, which might be expensive
depending on your OS and hardware.  I think all the other info is
"just sitting around", though.

            regards, tom lane