Re: [WIP] Performance Improvement by reducing WAL for Update Operation

From: Jesper Krogh [mailto:jesper(at)krogh(dot)cc]
Sent: Wednesday, August 22, 2012 1:13 AM
On 21/08/12 16:57, Amit kapila wrote:

>>Test results:

>>1. The pgbench test run for 10min.
>> 2. The test reult is for modified pgbench (such that total row size is
1800 and updated columns are of length 300) tpc-b testcase.
>> The result and modified pgbench code is attached with mail.

>> 3. The performance improvement shown in the m/c I have tested is quite
good (more than 100% for sync commit = off).

> I cannot comment on completeness or correctness of the code, but I do
think a relevant test would be
> to turn synchronous_commit on as default.

> Even though you aim at an improved performance, it would be nice to see
the reduction in WAL-size
>as an effect of this patch.

Yes, I shall take care of doing both the above tests and send the report.

With Regards,

Amit Kapila.