7.4.6 FC2 MUCH slower from 2.6.9-1.11 to 2.6.10-1.8

31 minutes in 2.6.10-1.8:

select kstime(), update_ranking_usuarios(), kstime();
       kstime        | update_ranking_usuarios |       kstime
---------------------+-------------------------+---------------------
 2005-01-13 20:27:56 |                         | 2005-01-13 20:58:46
(1 row)

5 minutes in 2.6.9-1.11:

select kstime(), update_ranking_usuarios(), kstime();
       kstime        | update_ranking_usuarios |       kstime
---------------------+-------------------------+---------------------
 2005-01-13 23:24:30 |                         | 2005-01-13 23:29:26
(1 row)

The function:

CREATE OR REPLACE FUNCTION update_ranking_usuarios()
  RETURNS void AS
'declare
 linha record;
 rank integer;
begin
rank := 0;
for linha in
 select usuario
  from usuarios_producao
  where not anonymous --and n_time != 446
  order by pontos_0 desc
loop
 rank := rank + 1;
 update usuarios_producao
  set rank_0 = rank
  where usuario = linha.usuario
  ;
end loop;
-- ----------------------------------------------------------
rank := 0;
for linha in
 select usuario
  from usuarios_producao
  where not anonymous --and n_time != 446
  order by pontos_0 + (( pontos_0 - pontos_7) / 7) desc
loop
 rank := rank + 1;
 update usuarios_producao
  set rank_24 = rank
  where usuario = linha.usuario
  ;
end loop;
-- ----------------------------------------------------------
rank := 0;
for linha in
 select usuario
  from usuarios_producao
  where not anonymous --and n_time != 446
  order by pontos_0 + pontos_0 - pontos_7 desc
loop
 rank := rank + 1;
 update usuarios_producao
  set rank_7 = rank
  where usuario = linha.usuario
  ;
end loop;
-- ----------------------------------------------------------
rank := 0;
for linha in
 select usuario
  from usuarios_producao
  where not anonymous --and n_time != 446
  order by pontos_0 + (( pontos_0 - pontos_7) * 30 / 7) desc
loop
 rank := rank + 1;
 update usuarios_producao
  set rank_30 = rank
  where usuario = linha.usuario
  ;
end loop;
return;
end;'
  LANGUAGE 'plpgsql' STABLE;

Part of postgresql.conf:

shared_buffers = 3000           # min 16, at least max_connections*2, 8KB each
sort_mem = 49152                # min 64, size in KB
vacuum_mem = 32768              # min 1024, size in KB
vacuum_mem = 32768
max_fsm_pages = 300000          # min max_fsm_relations*16, 6 bytes each
fsync = false
wal_buffers = 256
checkpoint_segments = 32        # in logfile segments, min 1, 16MB each

The log file shows only a long list of:

LOG:  recycled transaction log file "0000010A000000D0"
LOG:  recycled transaction log file "0000010A000000CF"
LOG:  recycled transaction log file "0000010A000000C9"
...

Regards, Clodoaldo Pinto





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