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So, the question is, can someone look at these settings and give an
opinion on whether they are approximately right or need serious
tweaking.
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--From postgresql.conf---
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#-----------------------------------------------------------------------
----
# RESOURCE USAGE (except WAL)
#-----------------------------------------------------------------------
----
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# - Memory -
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shared_buffers =3D 128000 # min 16, at least max_connections*2,
8KB each
sort_mem =3D 8192 # min 64, size in KB
vacuum_mem =3D 65536 # min 1024, size in KB
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# - Free Space Map -
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#max_fsm_pages =3D 20000 # min max_fsm_relations*16, 6 bytes =
each
#max_fsm_relations =3D 1000 # min 100, ~50 bytes each
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# - Kernel Resource Usage -
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#max_files_per_process =3D 1000 # min 25
#preload_libraries =3D ''
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#-----------------------------------------------------------------------
----
# WRITE AHEAD LOG
#-----------------------------------------------------------------------
----
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# - Settings -
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#fsync =3D true # turns forced synchronization on or =
off
#wal_sync_method =3D fsync # the default varies across platforms:
# fsync, fdatasync, open_sync, or
open_datasync
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wal_buffers =3D 64 # min 4, 8KB each
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# - Checkpoints -
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#checkpoint_segments =3D 3 # in logfile segments, min 1, 16MB =
each
#checkpoint_timeout =3D 300 # range 30-3600, in seconds
#checkpoint_warning =3D 30 # 0 is off, in seconds
#commit_delay =3D 0 # range 0-100000, in microseconds
#commit_siblings =3D 5 # range 1-1000
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--
Andrew Walmsley
=20
Software Development
Travel Technology Systems Ltd.
2 Nile Close, Riversway
Preston, PR2 2XU
Tel: 01772 766800
Fax: 01772 766801
(please note the new address and contact number)
=20
This Email may contain information of a confidential and/or privileged
nature.
The information transmitted is intended only for the benefit of the
person or entity to which it is addressed and must not be copied or
forwarded without the sender's express permission.
This Email does not reflect the views or opinions of Travel Technology
Systems Ltd.
This Email is without prejudice.
This Email does not constitute an agreement either explicitly or
implicitly with Travel Technology Systems Ltd.
=20
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<div class=3DSection1>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hello all.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>((Apologies if this appears twice, I sent it two days =
ago
and it doesn’t appear to have turned up on the list, so I chopped =
a lot
of the tech stuff in case it was a length of email =
issue))<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I have a problem with what I _think_ is PSQL =
tuning. I
am _not_ a postgres expert and have inherited the current settings which =
to me
seem wrong.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>We have what I would call a beast of a machine, 8 * =
2.7 GHz
Xeon processors, with 4 GB of memory, running Red Hat Enterprise (
2.6.9-11.ELsmp ) and PostgreSql 7.4.8<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The database acts as a front end cache of data held
elsewhere. At the start of day all the tables are dropped and recreated. =
As the
day goes on, an update file is sent at regular intervals to update the =
table
with the latest information. The update file is cumulative, slowly =
increasing
in size ( up to 1876183 bytes) throughout the day. The problem is that =
the
machine starts to grind to a halt processing the update files. The =
database is
not that big, the important tables have only 198,000 rows. The =
processors are
all showing 80-95% idle, but vmstat shows 20,000+ context switches and =
is
dropping processes from the run queue. <o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>From what I understand this machine should not be =
floored by
such a trivial task.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>So, the question is, can someone look at these =
settings and
give an opinion on whether they are approximately right or need serious
tweaking.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>--From =
postgresql.conf---<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#-----------------------------------------------------=
----------------------<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># RESOURCE USAGE (except =
WAL)<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#-----------------------------------------------------=
----------------------<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># - Memory -<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>shared_buffers =3D
128000 # min 16, at =
least
max_connections*2, 8KB each<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>sort_mem =3D
8192 # min 64, size in =
KB<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>vacuum_mem =3D
65536 &n=
bsp;
# min 1024, size in KB<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># - Free Space Map -<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#max_fsm_pages =3D
20000 # min
max_fsm_relations*16, 6 bytes each<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#max_fsm_relations =3D
1000 # min 100, ~50 bytes =
each<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># - Kernel Resource Usage =
-<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#max_files_per_process =3D 1000 # min =
25<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#preload_libraries =3D =
''<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#-----------------------------------------------------=
----------------------<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># WRITE AHEAD LOG<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#-----------------------------------------------------=
----------------------<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># - Settings -<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#fsync =3D
true &nb=
sp;
# turns forced synchronization on or off<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#wal_sync_method =3D
fsync # the default varies =
across
platforms:<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'> =
&=
nbsp;
# fsync, fdatasync, open_sync, or =
open_datasync<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>wal_buffers =3D
64  =
;
# min 4, 8KB each<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'># - Checkpoints -<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#checkpoint_segments =3D
3 # in logfile segments, min =
1, 16MB
each<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#checkpoint_timeout =3D
300 # range 30-3600, in =
seconds<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#checkpoint_warning =3D
30 # 0 is off, in =
seconds<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#commit_delay =3D
0 =
# range 0-100000, in microseconds<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>#commit_siblings =3D
5 # =
range
1-1000<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>--<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Andrew Walmsley<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Software Development<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Travel Technology Systems Ltd.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>2 <st1:place w:st=3D"on">Nile</st1:place> Close, =
Riversway<o:p></o:p></span></font></p>
<p class=3DMsoNormal><st1:place w:st=3D"on"><st1:City w:st=3D"on"><font =
size=3D3
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt'>Preston</span></font></st1:City>,
<st1:PostalCode w:st=3D"on">PR2 =
2XU</st1:PostalCode></st1:place><o:p></o:p></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Tel: 01772 766800<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Fax: 01772 766801<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>(please note the new address and contact =
number)<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>This Email may contain information of a confidential and/or =
privileged
nature.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>The information transmitted is intended only for the benefit of =
the
person or entity to which it is addressed and must not be copied or =
forwarded
without the sender's express permission.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>This Email does not reflect the views or opinions of Travel =
Technology
Systems Ltd.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>This Email is without prejudice.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>This Email does not constitute an agreement either explicitly or
implicitly with Travel Technology Systems =
Ltd.</span></font><o:p></o:p></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
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