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Re: WIP patch for hint bit i/o mitigation

From: Hari Babu <haribabu(dot)kommi(at)huawei(dot)com>
To: "'Merlin Moncure'" <mmoncure(at)gmail(dot)com>, "'Amit Kapila'"<amit(dot)kapila(at)huawei(dot)com>
Cc: "'Greg Smith'" <greg(at)2ndquadrant(dot)com>, "'Atri Sharma'" <atri(dot)jiit(at)gmail(dot)com>, "'PostgreSQL-development'" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WIP patch for hint bit i/o mitigation
Date: 2012-12-07 14:26:12
Message-ID: 002501cdd486$cf5d5940$6e180bc0$@kommi@huawei.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Thu, Dec 6, 2012 at 8:52 PM, Merlin Moncure <mmoncure(at)gmail(dot)com> wrote:
>Thanks for that -- that's fairly comprehensive I'd say.  I'm quite
>interested in that benchmarking framework as well.  Do you need help
>setting up the scripts?

Presently I am testing with pgbench custom query option & taking IO & VM
statistics in parallel. 

Following way I had written the test script for case -1.
 
./psql -f bench_test_1_init.sql postgres 
iostat -t 1 -d > hint.test1.iostat.reading_3.txt & 
vmstat -n 1 > hint.test1.vmstat.reading_3.txt & 
./pgbench -f bench_test_1.sql -T 300 -c 8 -j 8 -n postgres 
killall -s SIGINT iostat 
killall -s SIGINT vmstat

Where the sql files are as follows:

-- bench_test_1.sql
select count(*) from  bench where f1 is not null;

--bench_test_1_init.sql

drop table if exists bench;
create table bench(f0 int primary key, f1 char(50));
insert into bench values (generate_series(1, 100000), 'a');
insert into bench values (generate_series(100001, 200000), 'a');
...
insert into bench values (generate_series(9800001, 9900000), 'a');
insert into bench values (generate_series(9900001, 10000000), 'a');
checkpoint;

I will provide the test results later.

Any suggestions/comments?

Regards,
Hari babu.




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