Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade

From: Tom Lane
Subject: Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade
Date: ,
Msg-id: 7442.1511283687@sss.pgh.pa.us
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In response to: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)")
Responses: Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Robert Haas)
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pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
 RE: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Igor Neyman, )
  Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
   RE: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Igor Neyman, )
    Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
     RE: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Igor Neyman, )
      Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
       RE: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Igor Neyman, )
  Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Shaul Dar, )
 Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Tom Lane, )
  Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Robert Haas, )
   Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Tom Lane, )
    Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
     Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Tom Lane, )
      Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
       Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
        Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Matthew Hall, )
         Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
          Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
           Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Matthew Hall, )
            Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
         Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Andres Freund, )
    Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
 Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Patrick KUI-LI, )
  Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  ("Henrik Cednert (Filmlance)", )
   Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Gunther, )
    Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Laurenz Albe, )
     Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade  (Claudio Freire, )

"Henrik Cednert (Filmlance)" <> writes:
> The last pg_dump with 8.4 took 212 minutes and 49 seconds.And now with 9.5 the very same pg_dump takes 644 minutes
and40 seconds. To it takes about three times as long now and I have no idea to why. Nothing in the system or hardware
otherthan the pgsql upgrade have change. 

Can you get a profile of where the machine is spending its time during the
dump run?  On Linux I'd recommend "perf", but on macOS, hmm ...
You could use Activity Monitor, but as far as I can see that just captures
short-duration snapshots, which might not be representative of a 10-hour
run.  XCode's Instruments feature would probably be better about giving
a full picture, but it has a steep learning curve.
        regards, tom lane



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From: Tom Lane
Date:
Subject: Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade
From: "Henrik Cednert (Filmlance)"
Date:
Subject: Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade