On Sun, Feb 19, 2012 at 4:17 AM, Robert Haas robertmh...@gmail.com wrote:
Here's what's bugging me. Greg seemed to be assuming that the
business of the background writer might be the cause of the
performance drop-off he measured on certain test cases. But you and I
both seem to feel that
On Tue, Feb 14, 2012 at 6:45 PM, Greg Smith g...@2ndquadrant.com wrote:
Minimal changes were made to the postgresql.conf. shared_buffers=2GB,
checkpoint_segments=64, and I left wal_buffers at its default so that 9.1
got credit for that going up. See
The documentation of the pg_upgrade -l/--logfile option never made much
sense to me:
-l, --logfile=FILENAMElog session activity to file
I don't know what session means for pg_upgrade, so I never used it.
What it actually does is log the output of all the programs that
pg_upgrade calls
On Sun, Feb 19, 2012 at 1:18 AM, Erik Rijkers e...@xs4all.nl wrote:
On Sun, February 19, 2012 06:27, Robert Haas wrote:
On Sat, Feb 18, 2012 at 11:58 AM, Erik Rijkers e...@xs4all.nl wrote:
pg_restore ignores environment variable PGDATABASE.
What exactly do you mean by ignores? pg_restore
On 19-02-2012 02:24, Robert Haas wrote:
I have attached tps scatterplots. The obvious conclusion appears to
be that, with only 16MB of wal_buffers, the buffer wraps around with
some regularity
Isn't it useful to print some messages on the log when we have wrap around?
In this case, we have an
On 02/19/2012 08:02 AM, Robert Haas wrote:
On Sun, Feb 19, 2012 at 1:18 AM, Erik Rijkerse...@xs4all.nl wrote:
On Sun, February 19, 2012 06:27, Robert Haas wrote:
On Sat, Feb 18, 2012 at 11:58 AM, Erik Rijkerse...@xs4all.nl wrote:
pg_restore ignores environment variable PGDATABASE.
What
On Thu, Feb 16, 2012 at 1:53 PM, Robert Haas robertmh...@gmail.com wrote:
+ /*
+ * If we're in recovery we cannot dirty a page
because of a hint.
+ * We can set the hint, just not dirty the page as a
result so
+
On Sun, Feb 19, 2012 at 9:46 AM, Euler Taveira de Oliveira
eu...@timbira.com wrote:
On 19-02-2012 02:24, Robert Haas wrote:
I have attached tps scatterplots. The obvious conclusion appears to
be that, with only 16MB of wal_buffers, the buffer wraps around with
some regularity
Isn't it
On Sun, Feb 19, 2012 at 6:13 AM, Peter Eisentraut pete...@gmx.net wrote:
The documentation of the pg_upgrade -l/--logfile option never made much
sense to me:
-l, --logfile=FILENAME log session activity to file
I don't know what session means for pg_upgrade, so I never used it.
What
Robert Haas robertmh...@gmail.com writes:
On Sun, Feb 19, 2012 at 9:46 AM, Euler Taveira de Oliveira
eu...@timbira.com wrote:
Isn't it useful to print some messages on the log when we have wrap around?
In this case, we have an idea that wal_buffers needs to be increased.
I was thinking about
On Sun, Feb 19, 2012 at 6:33 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Robert Haas robertmh...@gmail.com writes:
On Sun, Feb 19, 2012 at 9:46 AM, Euler Taveira de Oliveira
eu...@timbira.com wrote:
Isn't it useful to print some messages on the log when we have wrap
around?
In this case, we have
Recent changes for power reduction mean that we now issue a wakeup
call to the bgwriter every time we set a hint bit.
However cheap that is, its still overkill.
My proposal is that we wakeup the bgwriter whenever a backend is
forced to write a dirty buffer, a job the bgwriter should have been
Hello
I found so this extremely simple patch should be useful.
It helps for pattern SELECT fx();
There was thread about it.
Regards
Pavel
*** ./src/bin/psql/tab-complete.c.orig 2012-02-05 11:28:48.0 +0100
--- ./src/bin/psql/tab-complete.c 2012-02-19 20:05:05.241626625 +0100
On Sun, Feb 19, 2012 at 4:35 PM, Simon Riggs si...@2ndquadrant.com wrote:
We don't need to wait until nobody has it set, we just need to wait
for the people that had it set when we first checked to be out of that
state momentarily.
I've just finished doing some performance analysis on various
Hello
other very simple patch - enhance autocomplete to support CREATE OR
REPLACE FUNCTION statement
Regards
Pavel Stehule
*** ./src/bin/psql/tab-complete.c.orig 2012-02-19 20:05:05.0 +0100
--- ./src/bin/psql/tab-complete.c 2012-02-19 20:20:43.817202512 +0100
***
*** 644,649
On Sun, Feb 19, 2012 at 1:53 PM, Simon Riggs si...@2ndquadrant.com wrote:
Recent changes for power reduction mean that we now issue a wakeup
call to the bgwriter every time we set a hint bit.
However cheap that is, its still overkill.
My proposal is that we wakeup the bgwriter whenever a
On Sun, Feb 19, 2012 at 8:15 PM, Robert Haas robertmh...@gmail.com wrote:
On Sun, Feb 19, 2012 at 1:53 PM, Simon Riggs si...@2ndquadrant.com wrote:
Recent changes for power reduction mean that we now issue a wakeup
call to the bgwriter every time we set a hint bit.
However cheap that is, its
On 02/19/2012 04:18 PM, Andrew Dunstan wrote:
[redirecting to -hackers]
Arghh, this time redirecting ...
On 02/19/2012 12:04 PM, Pavel Stehule wrote:
Hello
nice
should be this functionality used for query too?
some like
pg_pretty_query('SELECT ... ', 80)
when we have this
On Sun, Feb 19, 2012 at 11:35 AM, Simon Riggs si...@2ndquadrant.com wrote:
Doesn't this seem awfully bad for performance on Hot Standby servers?
I agree that it fixes the problem with un-WAL-logged pages there, but
I seem to recall some recent complaining about performance features
that work
On Sun, Feb 19, 2012 at 4:11 PM, Simon Riggs si...@2ndquadrant.com wrote:
On Sun, Feb 19, 2012 at 8:15 PM, Robert Haas robertmh...@gmail.com wrote:
On Sun, Feb 19, 2012 at 1:53 PM, Simon Riggs si...@2ndquadrant.com wrote:
Recent changes for power reduction mean that we now issue a wakeup
call
I missed all the fun while the leakproof addition to function
attributes was being decided, so I know I'm late to the party. Today I
had to go and look up what it actually meant. I have to say that I was a
bit surprised. I expected it to refer to memory management in some way.
I don't honestly
On 19 February 2012 15:49, Tom Lane t...@sss.pgh.pa.us wrote:
That sounds great.
BTW, if you don't have it already, I'd highly recommend getting a copy
of Friedl's Mastering Regular Expressions. It's aimed at users not
implementers, but there is a wealth of valuable context information in
On Sun, Feb 19, 2012 at 2:18 PM, Robert Haas robertmh...@gmail.com wrote:
Also, in general, I think that it's not a good idea to let dirty data
sit in shared_buffers forever. I'm unhappy about the change this
release cycle to skip checkpoints if we've written less than a full
WAL segment,
On Sun, Feb 19, 2012 at 10:04 PM, Robert Haas robertmh...@gmail.com wrote:
To me, it seems that you are applying a double standard. You have
twice attempted to insist that I do extra work to make major features
that I worked on - unlogged tables and index-only scans - work in Hot
Standby
Brendan Jurd dire...@gmail.com writes:
Are you far enough into the backrefs bug that you'd prefer to see it
through, or would you like me to pick it up?
Actually, what I've been doing today is a brain dump. This code is
never going to be maintainable by anybody except its original author
On Sun, Feb 19, 2012 at 10:04 PM, Robert Haas robertmh...@gmail.com wrote:
As explained in detailed comments, the purpose of this is to implement
Heikki's suggestion that we have a bit set to zero so we can detect
failures that cause a run of 1s.
I think it's nonsensical to pretend that
On 18/02/12 21:18, Jan Urbański wrote:
On 18/02/12 21:17, Tom Lane wrote:
=?UTF-8?B?SmFuIFVyYmHFhHNraQ==?= wulc...@wulczer.org writes:
On 18/02/12 20:30, Tom Lane wrote:
Dave Malcolm at Red Hat has been working on a static code analysis tool
for Python-related C code. He reports here on some
On 14/02/12 01:35, Tom Lane wrote:
=?UTF-8?B?SmFuIFVyYmHFhHNraQ==?= wulc...@wulczer.org writes:
It's not very comfortable, but
I think PLyDict_FromTuple can be allowed to be non-reentrant.
I think that's pretty short-sighted. Even if it's safe today (which
I am not 100% convinced of),
On Sun, Feb 19, 2012 at 5:29 PM, Andrew Dunstan and...@dunslane.net wrote:
I missed all the fun while the leakproof addition to function attributes
was being decided, so I know I'm late to the party. Today I had to go and
look up what it actually meant. I have to say that I was a bit surprised.
On Sun, Feb 19, 2012 at 5:56 PM, Jeff Janes jeff.ja...@gmail.com wrote:
Would the log really have been archived in 9.1? I don't think
checkpoint_timeout caused a log switch, just a checkpoint which could
happily be in the same file as the previous checkpoint.
The log segment doesn't need to
On Sun, Feb 19, 2012 at 6:33 PM, Simon Riggs si...@2ndquadrant.com wrote:
On Sun, Feb 19, 2012 at 10:04 PM, Robert Haas robertmh...@gmail.com wrote:
To me, it seems that you are applying a double standard. You have
twice attempted to insist that I do extra work to make major features
that I
On 20 February 2012 10:42, Tom Lane t...@sss.pgh.pa.us wrote:
I have also got
a bunch of text about the colormap management code, which I think
is interesting right now because that is what we are going to have
to fix if we want decent performance for Unicode \w and related
classes (cf the
Tom,
I did a google search, and found the following:
http://www.arglist.com/regex/
Which states that Tcl uses the same library from Henry. Maybe someone
involved with that project would help explain the library? Also I noticed
at the url above is a few ports people did from Henry's code. I
On Sun, Feb 19, 2012 at 6:57 PM, Simon Riggs si...@2ndquadrant.com wrote:
I thought it was a reasonable and practical idea from Heikki. The bit
is not selected arbitrarily, it is by design adjacent to one of the
other bits. So overall, 3 bits need to be set to a precise value and a
run of 1s
Billy Earney billy.ear...@gmail.com writes:
I did a google search, and found the following:
http://www.arglist.com/regex/
Hmm ... might be worth looking at those two pre-existing attempts at
making a standalone library from Henry's code, just to see what choices
they made.
Which states that
Robert Haas robertmh...@gmail.com writes:
On Sun, Feb 19, 2012 at 5:29 PM, Andrew Dunstan and...@dunslane.net wrote:
Can we come up with a more descriptive term?
We bikeshed on that topic a while back and nobody suggested anything
that got more than 1 or 2 votes. But I'm still happy to
Thanks Tom. I looked at the code in the libraries I referred to earlier,
and it looks like the code in the regex directory is exactly the same as
Walter Waldo's version, which has at least one comment from the middle of
last decade (~ 2003). Has people thought about migrating to the pcre
Billy,
* Billy Earney (billy.ear...@gmail.com) wrote:
Thanks Tom. I looked at the code in the libraries I referred to earlier,
and it looks like the code in the regex directory is exactly the same as
Walter Waldo's version, which has at least one comment from the middle of
last decade (~
On Feb 19, 2012, at 5:42 PM, Tom Lane wrote:
Robert Haas robertmh...@gmail.com writes:
Having now spent far too much time in bed with that patch, I'm feeling
like the concept that we are really looking for there is what some
languages call pure - that is, there must be no side effects,
I suspect this is wrong for similar reasons as pure but I'll throw
it out there: hermetic
--
greg
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Don Baccus dhog...@pacifier.com writes:
On Feb 19, 2012, at 5:42 PM, Tom Lane wrote:
Hmm, pure doesn't sound bad to me. Nice and short.
Technically, pure is stronger than has no side effects:
http://en.wikipedia.org/wiki/Pure_function
Result can't depend on state (for instance, database
On Sat, Feb 18, 2012 at 6:15 PM, Tom Lane t...@sss.pgh.pa.us wrote:
A larger point is that it'd be a real shame
for the Spencer regex engine to die off, because it is in fact one of
the best pieces of regex technology on the planet.
...
Another possible long-term answer is to finish the work
=?UTF-8?B?SmFuIFVyYmHFhHNraQ==?= wulc...@wulczer.org writes:
On 18/02/12 21:17, Tom Lane wrote:
Dave Malcolm at Red Hat has been working on a static code analysis tool
for Python-related C code. He reports here on some preliminary results
for plpython.c:
Greg,
* Greg Stark (st...@mit.edu) wrote:
I can't see how your first claim that the Spencer code is worth
keeping around because it's just a superior regex implementation has
much force unless we can accomplish the latter. If the library can be
split off into a standalone library then it
Greg Stark st...@mit.edu writes:
... We need a library that can be used to defend
against malicious regexes and i suspect neither Perl's nor Python's
library will suffice for this.
Yeah. Did you read the Russ Cox papers referenced upthread? One of the
things Google wanted was provably
On Mon, Feb 20, 2012 at 3:08 AM, Robert Haas robertmh...@gmail.com wrote:
On Sun, Feb 19, 2012 at 9:46 AM, Euler Taveira de Oliveira
eu...@timbira.com wrote:
On 19-02-2012 02:24, Robert Haas wrote:
I have attached tps scatterplots. The obvious conclusion appears to
be that, with only 16MB of
On 02/18/2012 02:35 PM, Robert Haas wrote:
I see CheckpointWriteDelay calling BgBufferSync
in 9.1. Background writing would stop during the sync phase and
perhaps slow down a bit during checkpoint writing, but I don't think
it was stopped completely.
The sync phase can be pretty long
On 02/19/2012 05:37 AM, Simon Riggs wrote:
Please retest with wal_buffers 128MB, checkpoint_segments 1024
The test parameters I'm using aim to run through several checkpoint
cycles in 10 minutes of time. Bumping up against the ugly edges of
resource bottlenecks is part of the test.
On 02/19/2012 12:24 AM, Robert Haas wrote:
I think we might want to consider
adjusting our auto-tuning formula for wal_buffers to allow for a
higher cap, although this is obviously not enough data to draw any
firm conclusions.
That's an easy enough idea to throw into my testing queue. The
On 02/19/2012 10:28 PM, Greg Stark wrote:
One thing that concerns me more and more is that most sufficiently
powerful regex implementations are susceptible to DOS attacks.
There's a list of evil regexes at http://en.wikipedia.org/wiki/ReDoS
The Perl community's reaction to Russ Cox's regex
On Feb 19, 2012, at 7:24 PM, Tom Lane wrote:
Don Baccus dhog...@pacifier.com writes:
On Feb 19, 2012, at 5:42 PM, Tom Lane wrote:
Hmm, pure doesn't sound bad to me. Nice and short.
Technically, pure is stronger than has no side effects:
http://en.wikipedia.org/wiki/Pure_function
Result
Stephen Frost wrote:
Alright, I'll bite.. Which existing regexp implementation that's well
written, well maintained, and which is well protected against malicious
regexes should we be considering then?
FWIW, there's a benchmark here that compares a number of regexp engines,
including PCRE,
On Sun, Feb 19, 2012 at 10:24 PM, Tom Lane t...@sss.pgh.pa.us wrote:
Don Baccus dhog...@pacifier.com writes:
On Feb 19, 2012, at 5:42 PM, Tom Lane wrote:
Hmm, pure doesn't sound bad to me. Nice and short.
Technically, pure is stronger than has no side effects:
On Sun, Feb 19, 2012 at 11:12 PM, Greg Smith g...@2ndquadrant.com wrote:
I'm collecting one last bit of data before posting another full set of
results, but I'm getting more comfortable the issue here is simply changes
in the BGW behavior. The performance regression tracks the background
But by using the above code: how do we deal with multiple matching values?
For example:
question name=“my_question
tag java /tag
tag c++ /tag
/question
In this case, perhaps I would want something like
---+-
my_question | java
my_question | c++
--
View this message in
I was trying to understand this patch and had few doubts:
1. In PerformXLogInsert(), why there is need to check freespace when already
during ReserveXLogInsertLocation(),
the space is reserved.
Is it possible that the record size is more than actually calculted in
On Sat, Feb 18, 2012 at 2:16 AM, Robert Haas robertmh...@gmail.com wrote:
On Fri, Feb 17, 2012 at 5:04 AM, Fujii Masao masao.fu...@gmail.com wrote:
Here are review comments:
The document about EXPLAIN needs to be updated.
You forgot to add the long-integer-valued property of
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