>>>>> "Frank" == Frank Joerdens <frank@joerdens.de> writes:
Frank> On Thu, Jan 25, 2001 at 11:07:19PM -0500, Tom Lane wrote:
>> Frank Joerdens <frank@joerdens.de> writes: > What performance
>> penalty can I expect when going over TCP/IP sockets > instead
>> of Unix sockets?
>>
>> On a properly designed kernel, there shouldn't be any
>> measurable performance difference between a local TCP
>> connection and a Unix-socket connection.
Frank> Ah. That's good hear. I'd heard that TCP/IP was
Frank> _significantly_ slower than Unix sockets. But maybe that
Frank> was just Linux.
I must admit from my mysql days that this comment was made, but we are
probably talking a couple of years ago, which would be Linux
2.0. Whether 2.2 was better, or 2.4 is I am completely clueless. Here
is an excerpt from the mysql manual (heres hoping I won't be lynched
for posting this :-) :-
You get the fastest executable when you link with -static. Using
Unix sockets rather than TCP/IP to connect to a database also
gives better performance.
and :-
Here is a list of some mesurements that we have done:
<snip>
If you connect using TCP/IP rather than Unix sockets, the result
is 7.5% slower.
<snip>
I searched on google for references to this, plenty of mysql hits, but
also other systems, for example Cold Fusion has this to say :-
In our testing, the use of the newly implemented TCP Network
socket communication will degrade performance by 10-15% or more
from the default Unix Domain socket
(although this may be because of Cold Fusion itself).
I must admit most of the other references to slower TCP than Unix
sockets are to older documents. I suppose the easiest thing to do is
setup a test and see for yourself.
Sorry if this is becoming to OT,
Sincerely,
Adrian Phillips
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