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Remove the separate 'stats buffer' process, letting backend stats messages

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be delivered directly to the collector process.  The extra process context
swaps required to transfer data through the buffer process seem to outweigh
any value the buffering might have.  Per recent discussion and tests.
I modified Bruce's draft patch to use poll() rather than select() where
available (this makes a noticeable difference on my system), and fixed
up the EXEC_BACKEND case.
This commit is contained in:
Tom Lane
2006-06-29 20:00:08 +00:00
parent cd4609e2a4
commit 51e400c9c6
4 changed files with 192 additions and 567 deletions
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18
doc/src/sgml/monitoring.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.35 2006/06/27 19:07:50 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.36 2006/06/29 20:00:08 tgl Exp $ -->
<chapter id="monitoring">
<title>Monitoring Database Activity</title>
@ -50,7 +50,7 @@
<screen>
$ ps auxww | grep ^postgres
postgres 960 0.0 1.1 6104 1480 pts/1 SN 13:17 0:00 postgres -i
postgres 963 0.0 1.1 7084 1472 pts/1 SN 13:17 0:00 postgres: stats buffer process
postgres 963 0.0 1.1 7084 1472 pts/1 SN 13:17 0:00 postgres: writer process
postgres 965 0.0 1.1 6152 1512 pts/1 SN 13:17 0:00 postgres: stats collector process
postgres 998 0.0 2.3 6532 2992 pts/1 SN 13:18 0:00 postgres: tgl runbug 127.0.0.1 idle
postgres 1003 0.0 2.4 6532 3128 pts/1 SN 13:19 0:00 postgres: tgl regression [local] SELECT waiting
@ -60,10 +60,11 @@ postgres 1016 0.1 2.4 6532 3080 pts/1 SN 13:19 0:00 postgres: tgl reg
(The appropriate invocation of <command>ps</> varies across different
platforms, as do the details of what is shown. This example is from a
recent Linux system.) The first process listed here is the
the master server process. The command arguments
master server process. The command arguments
shown for it are the same ones given when it was launched. The next two
processes implement the statistics collector, which will be described in
detail in the next section. (These will not be present if you have set
processes are background worker processes automatically launched by the
master process. (The <quote>stats collector</> process will not be present
if you have set
the system not to start the statistics collector.) Each of the remaining
processes is a server process handling one client connection. Each such
process sets its command line display in the form
@ -83,6 +84,13 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
thereby release some lock or other.
</para>
<para>
If you have turned off <xref linkend="guc-update-process-title"> then the
activity indicator is not updated; the process title is set only once
when a new process is launched. On some platforms this saves a useful
amount of per-command overhead, on others it's insignificant.
</para>
<tip>
<para>
<productname>Solaris</productname> requires special handling. You must