| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Robert Lor <Robert(dot)Lor(at)Sun(dot)COM> |
| Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, pgsql-hackers list <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: DTrace probes patch |
| Date: | 2008-12-17 17:25:50 |
| Message-ID: | 20081217172550.GH4453@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Robert Lor escribió:
> Fujii Masao wrote:
>> Hi,
>>
>> On Wed, Dec 17, 2008 at 4:53 AM, Robert Lor <Robert(dot)Lor(at)sun(dot)com> wrote:
>> Why is TRACE_POSTGRESQL_WAL_BUFFER_WRITE_START/DONE called
>> only in AdvanceXLInsertBuffer? We can trace only a part of WAL buffer write?
>>
> The intention of these probes is to determine if wal_buffers is too
> small by monitoring how frequent the server has to write out the buffers
> along with the I/O time.
But there are 5 callers of XLogWrite ... why aren't the other ones being
tracked too?
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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