the selected page is clean, we're set.
*/
if (!shared->page_dirty[bestvalidslot])
return bestvalidslot;
--发件人：Andres
Freund 发送时间：2015年9月9日(星期三) 02:28收件人：周正中(德歌)
抄 送：Amit Kapila ，张广舟(明虚)
，pgsql-hackers
，范孝剑(康贤) ，曾文旌(义从)
，窦贤明(执白) ，萧少聪(铁庵)
，陈新坚(惧留孙) 主 题：Re:
On 2015-09-09 10:46:47 -0400, Robert Haas wrote:
> Well, if you're filling ~1 clog page per second, you're doing ~1 fsync
> per second too. Or if you are not, then you are thrashing the
> progressively smaller and smaller number of clean slots ever-harder
> until no clean pages remain and you're f
On Wed, Sep 9, 2015 at 10:35 AM, Tom Lane wrote:
> Robert Haas writes:
>> ... How often such a workload actually has to replace a *dirty* clog
>> buffer obviously depends on how often you checkpoint, but if you're
>> getting ~28k TPS you can completely fill 32 clog buffers (1 million
>> transacti
Robert Haas writes:
> ... How often such a workload actually has to replace a *dirty* clog
> buffer obviously depends on how often you checkpoint, but if you're
> getting ~28k TPS you can completely fill 32 clog buffers (1 million
> transactions) in less than 40 seconds, and you're probably not
>
On Tue, Sep 8, 2015 at 2:28 PM, Andres Freund wrote:
> On 2015-09-08 15:58:26 +0800, 周正中(德歌) wrote:
>> postgres@digoal-> cat 7.sql
>> select txid_current();
>>
>> postgres@digoal-> pgbench -M prepared -n -r -P 1 -f ./7.sql -c 1 -j 1 -T
>> 10
>> About 32K tps.
>> progress: 240.0 s, 31164.4 tps
Hi,
On 2015-09-08 15:58:26 +0800, 周正中(德歌) wrote:
> postgres@digoal-> cat 7.sql
> select txid_current();
>
> postgres@digoal-> pgbench -M prepared -n -r -P 1 -f ./7.sql -c 1 -j 1 -T
> 10
> About 32K tps.
> progress: 240.0 s, 31164.4 tps, lat 0.031 ms stddev 0.183
> progress: 241.0 s, 33243.3
HI, this is the test case:Use stap track pg_clog/* fsync call.
[root@digoal ~]# cat trc.stp
global f_start[99]
probe
process("/opt/pgsql/bin/postgres").function("SlruPhysicalWritePage@/opt/soft_bak/postgresql-9.4.4/src/backend/access/transam/slru.c").call
{
f_start[execname(), pid(),
