Expensive log_line_prefix ?

From: "Sahagian, David" <david(dot)sahagian(at)emc(dot)com>
To: "'pgsql-general(at)postgresql(dot)org'" <pgsql-general(at)postgresql(dot)org>
Subject: Expensive log_line_prefix ?
Date: 2012-10-11 19:19:27
Message-ID: F3CBFBA88397EA498B22A05FFA9EC49DA9E05308@MX22A.corp.emc.com
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In 9.1.x

Are there any "extra" costs to logging all this cool stuff ?

log_line_prefix = '%m %a %u %p %c %m %v %x'

Are any of these expensive ?
Or is the only cost the number of bytes that the textual representation of their values take in the written log file ?

Thanks,
-dvs-

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