Re: Compression of full-page-writes

From: Haribabu kommi <haribabu(dot)kommi(at)huawei(dot)com>
To: KONDO Mitsumasa <kondo(dot)mitsumasa(at)lab(dot)ntt(dot)co(dot)jp>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Cc: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Compression of full-page-writes
Date: 2013-10-09 04:35:59
Message-ID: 8977CB36860C5843884E0A18D8747B0372BC7BD2@szxeml558-mbs.china.huawei.com
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On 08 October 2013 18:42 KONDO Mitsumasa wrote:
>(2013/10/08 20:13), Haribabu kommi wrote:
>> I will test with sync_commit=on mode and provide the test results.
>OK. Thanks!

Pgbench test results with synchronous_commit mode as on.

Thread-1 Threads-2
Head code FPW compress Head code FPW compress
Pgbench-org 5min 138(0.24GB) 131(0.04GB) 160(0.28GB) 163(0.05GB)
Pgbench-1000 5min 140(0.29GB) 128(0.03GB) 160(0.33GB) 162(0.02GB)
Pgbench-org 15min 141(0.59GB) 136(0.12GB) 160(0.65GB) 162(0.14GB)
Pgbench-1000 15min 138(0.81GB) 134(0.11GB) 159(0.92GB) 162(0.18GB)

Pgbench-org - original pgbench
Pgbench-1000 - changed pgbench with a record size of 1000.
5 min - pgbench test carried out for 5 min.
15 min - pgbench test carried out for 15 min.

From the above readings it is observed that,
1. There a performance dip in one thread test, the amount of dip reduces with the test run time.
2. More than 75% WAL reduction in all scenarios.

Please find the attached sheet for more details regarding machine and test configuration

Regards,
Hari babu.

Attachment Content-Type Size
compress_fpw_sync_on.htm text/html 61.0 KB

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