FYI -- I checked patch v81-0001 to find which of the #includes are
strictly needed.
==
src/backend/replication/logical/slotsync.c
1.
+#include "postgres.h"
+
+#include
+
+#include "access/genam.h"
+#include "access/table.h"
+#include "access/xlog_internal.h"
+#include "access/xlogrecovery.h"
On Thu, Feb 08, 2024 at 12:25:18PM +0900, Michael Paquier wrote:
> In HandleLogBacktraceInterrupt(), we don't use backtrace_symbols() and
> rely on backtrace_symbols_fd() to avoid doing malloc() in the signal
> handler as mentioned in [1] back in 2022. Perhaps the part about the
> fact that we don
> On 8 Feb 2024, at 06:52, Nathan Bossart wrote:
>
> For the same compASC() test, I see an ~8.4% improvement with your int64
> code and a ~3.4% improvement with this:
If we care about branch prediction in comparison function, maybe we could
produce sorting that inlines comparator, thus elimi
On Fri, Feb 09, 2024 at 04:32:05PM +0900, Sutou Kouhei wrote:
> In
> "Re: Make COPY format extendable: Extract COPY TO format implementations"
> on Fri, 9 Feb 2024 13:21:34 +0900,
> Michael Paquier wrote:
>> A next step I think we could take is to split the binary-only and the
>> text/csv-on
>Sorry if this has been brought up, but I noticed that some of the
>information is listed below the result set:
>
> postgres=# \conninfo+
>Current Connection Information
> -[ RECORD 1 ]--+-
> Database | postgres
> Authenticated User | nathan
Hi,
On Fri, Feb 09, 2024 at 03:38:23PM +0900, Yugo NAGATA wrote:
>
> I found the comment on query_id_enabled looks inaccurate because this is
> never set to true when compute_query_id is ON.
>
> /* True when compute_query_id is ON, or AUTO and a module requests them */
> bool query_id_enab
On 2024-Feb-09, Michael Paquier wrote:
> Anyway, I've been digging around the signal-safety of backtrace(3)
> (even looking a bit at some GCC code, brrr), and I am under the
> impression that backtrace() is just by nature not safe and also
> dangerous in signal handlers. One example of issue I've
On Fri, Feb 9, 2024 at 2:18 PM Alvaro Herrera wrote:
>
> On 2024-Feb-09, Michael Paquier wrote:
>
> > Anyway, I've been digging around the signal-safety of backtrace(3)
> > (even looking a bit at some GCC code, brrr), and I am under the
> > impression that backtrace() is just by nature not safe an
Hi,
With a db setup with pgbench, we add an additional index:
CREATE INDEX ON pgbench_accounts(abalance)
And trigger several updates and vacuum to reach a stable amount of
dirtied pages:
UPDATE pgbench_accounts set abalance = abalance + 1 WHERE aid=1; CHECKPOINT;
VACUUM (VERBOSE, INDEX_CLEANUP ON
Hi Pavel!
>The patch v10 build ends with a warning:
>$ make -j --silent
>describe.c:911:1: warning: no previous prototype for
>‘listConnectionInformation’ [-Wmissing-prototypes]
> 911 | listConnectionInformation()
| ^
>About terms.
I resolved this in v11. I had fo
> On 9 Feb 2024, at 00:04, Daniel Gustafsson wrote:
>
>> On 8 Feb 2024, at 15:16, Daniel Gustafsson wrote:
>
>> One option could perhaps be to include a version number for <= comparison,
>> and
>> if set to zero a function pointer to a version check function must be
>> provided?
>> That would
>Hi Nathan
>
>On 09.02.24 03:41, Nathan Bossart wrote:
>
>> Separately, does
>> the server version really belong here? I'm not sure I would consider that
>> to be connection information.
>>
>I tend to agree with you. The info there wouldn't hurt, but perhaps the
>client version would be a better f
Hi,
Here is the update of this patch.
1. What is it for?
commit f7b93acc24b4a152984048fefc6d71db606e3204 (HEAD -> jsonb_numeric)
Author: yizhi.fzh
Date: Fri Feb 9 16:54:06 2024 +0800
Improve the performance of Jsonb numeric/bool extraction.
JSONB object uses a binary compatible
Hmm, I noticed that this would call printSSLInfo() and printGSSInfo()
after listConnectionInformation. It would be much better to show these
in tabular format as well and remove the calls to printSSL/GSSInfo.
I propose additional columns to the same \conninfo+ table; when SSL,
like this:
Databas
On Fri, 9 Feb 2024 at 08:50, Michael Paquier wrote:
> Something to be aware of, but the community lists use bottom-posting
> for replies because it is easier to follow the logic of a thread this
> way. See here:
> https://en.wikipedia.org/wiki/Posting_style#Bottom-posting
>
Oh, sorry for not usi
On Tue, Feb 6, 2024 at 5:06 PM Masahiko Sawada
wrote:
>
> I've attached the new version patch set.
>
> Regards,
>
>
> --
> Masahiko Sawada
> Amazon Web Services: https://aws.amazon.com
Thanks for the patch. I reviewed that patch and did minimal testing and it
seems to show the speed up as claim
The attached v5 is a rebase with no new changes just to get a fresh run in the
CFBot before pushing. All review comments have been addressed and the patch
has been Ready for Committer for some time, just didn't have time to get to it
in the last CF.
--
Daniel Gustafsson
v5-0001-Refactor-pipe_r
On Fri, Feb 9, 2024 at 10:00 AM Zhijie Hou (Fujitsu)
wrote:
>
Few comments on 0001
===
1. Shouldn't pg_sync_replication_slots() check whether the user has
replication privilege?
2. The function declarations in slotsync.h don't seem to be in the
same order as they are defined in s
On Wed, Feb 7, 2024 at 10:24 AM Euler Taveira wrote:
>
> On Fri, Feb 2, 2024, at 6:41 AM, Hayato Kuroda (Fujitsu) wrote:
>
> Thanks for updating the patch!
>
>
> Thanks for taking a look.
>
> >
> I'm still working on the data structures to group options. I don't like the
> way
> it was grouped in
Dear Euler,
Further comments for v17.
01.
This program assumes that the target server has same major version with this.
Because the target server would be restarted by same version's pg_ctl command.
I felt it should be ensured by reading the PG_VERSION.
02.
pg_upgrade checked the version of usin
On Fri, 9 Feb 2024 at 00:26, Michael Paquier wrote:
> On Tue, Feb 06, 2024 at 07:01:49AM -0500, Dave Cramer wrote:
> > Thanks, this patch works and
> > testing with meson passes.
>
> Only with the version posted at [1]? Interesting, that's the same
> contents as v8 posted upthread, minus src/too
On 05.10.23 09:38, Jim Jones wrote:
>
> v8 attached changes de default behaviour to WITH COMMENTS.
v9 attached with rebase due to changes done to primnodes.h in 615f5f6
--
Jim
From fe51a1826b75b778c21f559236b23d340a10d703 Mon Sep 17 00:00:00 2001
From: Jim Jones
Date: Fri, 9 Feb 2024 13:51:44 +
Hello Andres,
05.04.2023 21:48, Andres Freund wrote:
I just saw the following failure:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=mylodon&dt=2023-04-05%2017%3A47%3A03
after a commit of mine. The symptoms look unrelated though.
[17:54:42.188](258.345s) # poll_query_until timed out e
Hello,
The patch attached fixes an oversight/inconsistency of disallowing the
pg_monitor system role to execute pg_current_logfile([text]).
pgwatch3=# create user joe;
CREATE ROLE
pgwatch3=# set role joe;
SET
pgwatch3=> select pg_current_logfile();
ERROR: permission denied for function pg_curren
On Thu, Feb 8, 2024 at 6:33 PM Hayato Kuroda (Fujitsu)
wrote:
>
> Dear Sawada-san,
>
> Thanks for making v3 patchset. I have also benchmarked the case [1].
> Below results are the average of 5th, there are almost the same result
> even when median is used for the comparison. On my env, the regress
On Fri, Feb 9, 2024 at 7:35 PM Ajin Cherian wrote:
>
>
>
> On Tue, Feb 6, 2024 at 5:06 PM Masahiko Sawada wrote:
>>
>>
>> I've attached the new version patch set.
>>
>> Regards,
>>
>>
>> --
>> Masahiko Sawada
>> Amazon Web Services: https://aws.amazon.com
>
>
> Thanks for the patch. I reviewed th
>Hmm, I noticed that this would call printSSLInfo() and printGSSInfo()
>after listConnectionInformation. It would be much better to show these
>in tabular format as well and remove the calls to printSSL/GSSInfo.
>
>I propose additional columns to the same \conninfo+ table; when SSL,
>like this:
>
Hi,
Currently the documentation of upgrade for streaming replication
section says that logical replication slots will be copied
irrespective of the version, but the logical replication slots are
copied only if the old primary is version 17.0 or later. The changes
for the same are in the attached p
On Thu, 1 Feb 2024 at 14:50, vignesh C wrote:
>
> On Wed, 31 Jan 2024 at 11:42, Hayato Kuroda (Fujitsu)
> wrote:
> >
> > Dear Vignesh,
> >
> > Thanks for updating the patch! Here are my comments for v6.
> >
> > 01.
> > ```
> > + Logical replication cluster
> > +
> > +
> > + A set of
On Fri, Feb 09, 2024 at 08:52:26AM +0100, Mats Kindahl wrote:
> Here is a new version introducing pg_cmp_s32 and friends and use them
> instead of the INT_CMP macro introduced before. It also moves the
> definitions to common/int.h and adds that as an include to all locations
> using these function
Nathan Bossart writes:
> On Fri, Feb 09, 2024 at 08:52:26AM +0100, Mats Kindahl wrote:
>> The types "int" and "size_t" are treated as s32 and u32 respectively since
>> that seems to be the case for most of the code, even if strictly not
>> correct (size_t can be an unsigned long int for some archi
On Fri, Feb 09, 2024 at 01:19:49PM +0500, Andrey M. Borodin wrote:
> If we care about branch prediction in comparison function, maybe we could
> produce sorting that inlines comparator, thus eliminating function call
> to comparator? We convert comparison logic to int, to extract comparison
> back
On Fri, Feb 09, 2024 at 04:01:58PM +0100, Pavlo Golub wrote:
> The patch attached fixes an oversight/inconsistency of disallowing the
> pg_monitor system role to execute pg_current_logfile([text]).
I think this is reasonable. We allow pg_monitor to execute functions like
pg_ls_logdir(), so it doe
Hi!
I agree with Heikki on most topics and especially the one he recommended
to publish your extension on GitHub, this tool is very promising for highly
loaded
systems, you will get a lot of feedback very soon.
I'm curious about SpinLock - it is recommended for very short operations,
taking up to
Álvaro,
All feedback is now completed. I added the additional checks for the new APIs
and a separate check for the header to autoconf.
About the double check for AVX 512 I added a large comment explaining why both
are needed. There are cases where the CPU ZMM# registers are not exposed by the
Hi,
On 2024-01-26 07:42:33 +0100, Alvaro Herrera wrote:
> This suggests that finding a way to make the ifunc stuff work (with good
> performance) is critical to this work.
Ifuncs are effectively implemented as a function call via a pointer, they're
not magic, unfortunately. The sole trick they pr
Hi,
On 2024-02-09 17:39:46 +, Amonson, Paul D wrote:
> diff --git a/meson.build b/meson.build
> index 8ed51b6aae..1e7a4dc942 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -1773,6 +1773,45 @@ elif cc.links('''
> endif
>
>
> +# XXX: The configure.ac check for __cpuidex() is broken, w
Hi,
On 2024-02-09 13:19:49 +0500, Andrey M. Borodin wrote:
> > On 8 Feb 2024, at 06:52, Nathan Bossart wrote:
> > For the same compASC() test, I see an ~8.4% improvement with your int64
> > code and a ~3.4% improvement with this:
>
> If we care about branch prediction in comparison function, mayb
Hi,
On 2024-02-09 19:46:58 +0300, Nikita Malakhov wrote:
> I agree with Heikki on most topics and especially the one he recommended
> to publish your extension on GitHub, this tool is very promising for highly
> loaded
> systems, you will get a lot of feedback very soon.
>
> I'm curious about Spi
Hi,
On 2024-02-09 18:00:01 +0300, Alexander Lakhin wrote:
> I've managed to reproduce this issue (which still persists:
> https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=kestrel&dt=2024-02-04%2001%3A53%3A44
> ) and saw that it's not checkpointer, but walsender is hanging:
How did you repr
> On 9 Feb 2024, at 21:32, Nathan Bossart wrote:
> a lot
> of current use-cases require inspecting specific fields of structs
Yes, I'm proposing to pass to sorting routine not a comparator, but value
extractor. And then rely on operators <,>,==.
In a pseudocode: instead of sort(array, (a,b)->
Hi,
On 2024-01-19 23:04:50 +0330, Majid Garoosi wrote:
> Following is the description which is also written in the commit message:
> MAX_SEND_SIZE parameter was used in WALSender to limit maximum size of
> a WAL data packet sent to a WALReceiver during replication. Although
> its default value (12
Dave Cramer
www.postgres.rocks
On Fri, 9 Feb 2024 at 07:18, Dave Cramer wrote:
>
>
>
>
> On Fri, 9 Feb 2024 at 00:26, Michael Paquier wrote:
>
>> On Tue, Feb 06, 2024 at 07:01:49AM -0500, Dave Cramer wrote:
>> > Thanks, this patch works and
>> > testing with meson passes.
>>
>> Only with the v
Hi,
On 2024-02-10 00:02:08 +0500, Andrey Borodin wrote:
> > Not really in this case. The call is perfectly predictable - a single
> > qsort()
> > will use the same callback for every comparison, whereas the if is perfectly
> > *unpredictable*. A branch mispredict is far more expensive than a cor
On Fri, Feb 9, 2024 at 5:24 PM Nathan Bossart
wrote:
> On Fri, Feb 09, 2024 at 08:52:26AM +0100, Mats Kindahl wrote:
> > Here is a new version introducing pg_cmp_s32 and friends and use them
> > instead of the INT_CMP macro introduced before. It also moves the
> > definitions to common/int.h and
Hi,
On 2024-02-09 13:21:34 +0900, Michael Paquier wrote:
> +static void
> +CopyFromTextInFunc(CopyFromState cstate, Oid atttypid,
> +FmgrInfo *finfo, Oid *typioparam)
> +{
> + Oid func_oid;
> +
> + getTypeInputInfo(atttypid, &func_oid, ty
On Fri, Feb 9, 2024 at 5:27 PM Tom Lane wrote:
> Nathan Bossart writes:
> > On Fri, Feb 09, 2024 at 08:52:26AM +0100, Mats Kindahl wrote:
> >> The types "int" and "size_t" are treated as s32 and u32 respectively
> since
> >> that seems to be the case for most of the code, even if strictly not
>
Hi,
On 2024-02-09 14:23:46 -0500, Dave Cramer wrote:
> > interestingly meson test does not produce any error
> > The buildfarm produces the following error for me:
> >
> > -SELECT relname, attname, coltypes, get_columns_length(coltypes)
> > - FROM check_columns
> > - WHERE get_columns_length(colty
On Fri, Feb 9, 2024 at 5:27 PM Tom Lane wrote:
> Nathan Bossart writes:
> > On Fri, Feb 09, 2024 at 08:52:26AM +0100, Mats Kindahl wrote:
> >> The types "int" and "size_t" are treated as s32 and u32 respectively
> since
> >> that seems to be the case for most of the code, even if strictly not
>
On Fri, Feb 9, 2024 at 8:26 PM Mats Kindahl wrote:
> On Fri, Feb 9, 2024 at 5:24 PM Nathan Bossart
> wrote:
>
>> On Fri, Feb 09, 2024 at 08:52:26AM +0100, Mats Kindahl wrote:
>> > Here is a new version introducing pg_cmp_s32 and friends and use them
>> > instead of the INT_CMP macro introduced b
Hi,
On 2023-12-31 15:13:03 +0900, Michael Paquier wrote:
> Some of my notes:
> - How much does command line editing work on Windows? When it came to
> VS, I always got the impression that this never worked. Andres in [2]
> mentioned otherwise because meson makes that easier?
Yea, I made it work
Hi,
On 2024-02-09 11:53:35 -0800, Andres Freund wrote:
> > Between MSYS2, mingw-w64 and Chocolatey, there are a lot of options
> > available to users. So shouldn't we try to recommend only of them,
> > then align the buildfarm and the CI to use one of them?
>
> I think regardless which of these
Hi,
On 2024-02-09 16:22:35 +0900, Michael Paquier wrote:
> diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
> index ed5b285a5e..af77352e6e 100644
> --- a/doc/src/sgml/installation.sgml
> +++ b/doc/src/sgml/installation.sgml
> @@ -193,6 +193,17 @@
>example, ICU_C
On Fri, Feb 09, 2024 at 08:40:47PM +0100, Mats Kindahl wrote:
> On Fri, Feb 9, 2024 at 5:27 PM Tom Lane wrote:
>> We do pretty much assume that "int" is "int32". But I agree that
>> assuming anything about the width of size_t is bad. I think we need
>> a separate pg_cmp_size() or pg_cmp_size_t()
Hello Hackers,
Folks, When tried to create a function with the same signature as procedure
it fails.
postgres=# create or replace procedure obj1(char) language plpgsql as $$
begin select $1; end; $$;
CREATE PROCEDURE
postgres=# create or replace function obj1(char) returns void language sql
as
On 2024-02-09 14:04:29 -0600, Nathan Bossart wrote:
> On Fri, Feb 09, 2024 at 08:40:47PM +0100, Mats Kindahl wrote:
> > On Fri, Feb 9, 2024 at 5:27 PM Tom Lane wrote:
> >> We do pretty much assume that "int" is "int32". But I agree that
> >> assuming anything about the width of size_t is bad. I
Hello,
While playing with this feature I found the following.
Two foreign tables:
postgres@demo_postgres_fdw(17.0)=# \det aircrafts|seats
List of foreign tables
Schema | Table | Server
+---+-
public | aircrafts | demo_server
public | seats | demo_se
On Fri, Feb 09, 2024 at 08:43:21PM +0100, Mats Kindahl wrote:
> QQ: right now it looks like this:
>
> static inline int
> pg_cmp_u16(uint16 a, uint16 b)
> {
>
> return (int32)a - (int32)b;
>
> }
>
>
> and
>
> static inline int
> pg_cmp_u32(uint32 a, uint32 b)
> {
>
> return (a > b) - (a < b)
On Fri, Feb 9, 2024 at 10:08 PM Pavel Luzanov wrote:
> While playing with this feature I found the following.
>
> Two foreign tables:
> postgres@demo_postgres_fdw(17.0)=# \det aircrafts|seats
> List of foreign tables
> Schema | Table | Server
> +---+-
> pu
On Fri, 9 Feb 2024 at 14:36, Andres Freund wrote:
> Hi,
>
> On 2024-02-09 14:23:46 -0500, Dave Cramer wrote:
> > > interestingly meson test does not produce any error
> > > The buildfarm produces the following error for me:
> > >
> > > -SELECT relname, attname, coltypes, get_columns_length(coltyp
The following review has been posted through the commitfest application:
make installcheck-world: tested, failed
Implements feature: not tested
Spec compliant: not tested
Documentation:not tested
Hello
I had a look at your patch, which applies fine to PostgreSQL maste
On Fri, Feb 9, 2024, 12:05 Deepak M wrote:
> Hello Hackers,
>
Wrong list, this is for discussions regarding patches.
> Folks, When tried to create a function with the same signature as
> procedure it fails.
>
That seems like a good hint you cannot do it. Specifically because they
get define
On Fri, Feb 09, 2024 at 10:24:32AM -0800, Andres Freund wrote:
> On 2024-01-26 07:42:33 +0100, Alvaro Herrera wrote:
> > This suggests that finding a way to make the ifunc stuff work (with good
> > performance) is critical to this work.
>
> Ifuncs are effectively implemented as a function call via
"David G. Johnston" writes:
> On Fri, Feb 9, 2024, 12:05 Deepak M wrote:
>> Folks, When tried to create a function with the same signature as
>> procedure it fails.
> That seems like a good hint you cannot do it. Specifically because they
> get defined in the same internal catalog within which
On Fri, Feb 09, 2024 at 02:27:26PM +0530, Ashutosh Bapat wrote:
> On Fri, Feb 9, 2024 at 2:18 PM Alvaro Herrera wrote:
>> Hmm, but the backtrace() manpage says
>>
>>• backtrace() and backtrace_symbols_fd() don't call malloc() explic‐
>> itly, but they are part of libgcc, whi
On Fri, Feb 09, 2024 at 11:56:08AM -0800, Andres Freund wrote:
> One thing I forgot: I found chocolatey to be painfully slow to install. And
> even at runtime, the wrappers it installs cause build time slowdowns too. And
> unnecessary rebuilds with visual studio, because default install paths trigg
On Fri, Feb 09, 2024 at 11:59:21AM -0800, Andres Freund wrote:
> On 2024-02-09 16:22:35 +0900, Michael Paquier wrote:
>> + Diff is required to run the regression
>> + tests. On Windows, it may not be available by default.
>> +
>> +
>>
>>
>
> It's not installed by defaul
On Fri, Feb 09, 2024 at 11:27:05AM -0800, Andres Freund wrote:
> On 2024-02-09 13:21:34 +0900, Michael Paquier wrote:
>> +static void
>> +CopyFromTextInFunc(CopyFromState cstate, Oid atttypid,
>> + FmgrInfo *finfo, Oid *typioparam)
>> +{
>> +Oid
On Fri, Feb 09, 2024 at 04:37:23PM +0800, Julien Rouhaud wrote:
> On Fri, Feb 09, 2024 at 03:38:23PM +0900, Yugo NAGATA wrote:
>> Also, I think the name is a bit confusing for the same reason, that is,
>> query_id_enabled may be false even when query id is computed in fact.
>>
>> Actually, this doe
Hey,
Deeply appreciate both your input!
On Thu, Feb 8, 2024 at 4:57 AM Heikki Linnakangas wrote:
> Hmm, there is a pair of SpinLockAcquire() and SpinLockRelease() in
> ProcKill(), before step 3 can happen. Comment in spin.h about
> SpinLockAcquire/Release:
>
> > *Load and store operations i
09.02.2024 21:59, Andres Freund wrote:
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=kestrel&dt=2024-02-04%2001%3A53%3A44
) and saw that it's not checkpointer, but walsender is hanging:
How did you reproduce this?
As kestrel didn't produce this failure until recently, I supposed th
On Friday, February 9, 2024 6:45 PM Amit Kapila wrote:
>
> On Fri, Feb 9, 2024 at 10:00 AM Zhijie Hou (Fujitsu)
> wrote:
> >
>
> Few comments on 0001
> ===
> 1. Shouldn't pg_sync_replication_slots() check whether the user has
> replication
> privilege?
Yes, added.
>
> 2. The
On Friday, February 9, 2024 12:27 PM Peter Smith wrote:
>
> Here are some review comments for patch v81-0001.
Thanks for the comments.
> . GENERAL - ReplicationSlotInvalidationCause enum.
>
> I was thinking that the ReplicationSlotInvalidationCause should
> explicitly set RS_INVAL_NONE = 0 (it
On Friday, February 9, 2024 4:13 PM Peter Smith wrote:
>
> FYI -- I checked patch v81-0001 to find which of the #includes are strictly
> needed.
Thanks!
>
> 1.
> ...
>
> Many of these #includes seem unnecessary. e.g. I was able to remove
> all those that are commented-out below, and the file
Hi,
On 2024-02-09 15:27:57 -0800, Noah Misch wrote:
> On Fri, Feb 09, 2024 at 10:24:32AM -0800, Andres Freund wrote:
> > On 2024-01-26 07:42:33 +0100, Alvaro Herrera wrote:
> > > This suggests that finding a way to make the ifunc stuff work (with good
> > > performance) is critical to this work.
>
On Thu, Feb 8, 2024 at 1:34 PM Andrei Lepikhov
wrote:
>
> On 3/2/2024 02:06, Alena Rybakina wrote:
> > On 01.02.2024 08:00, jian he wrote:
> > I added your code to the patch.
> Thanks Alena and Jian for the detailed scrutiny!
>
> A couple of questions:
> 1. As I see, transformAExprIn uses the same
On Fri, Feb 9, 2024 at 9:08 PM Nathan Bossart
wrote:
> On Fri, Feb 09, 2024 at 08:43:21PM +0100, Mats Kindahl wrote:
> > QQ: right now it looks like this:
> >
> > static inline int
> > pg_cmp_u16(uint16 a, uint16 b)
> > {
> >
> > return (int32)a - (int32)b;
> >
> > }
> >
> >
> > and
> >
> > stati
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