Re: Patch: Write Amplification Reduction Method (WARM)

From: Jaime Casanova <jaime(dot)casanova(at)2ndquadrant(dot)com>
To: Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Patch: Write Amplification Reduction Method (WARM)
Date: 2017-04-14 15:51:40
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On 5 April 2017 at 13:32, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com> wrote:
> Ok. I've extensively updated the README to match the current state of
> affairs. Updated patch set attached.

Hi Pavan,

I run a test on current warm patchset, i used pgbench with a scale of
20 and a fillfactor of 90 and then start the pgbench run with 6
clients in parallel i also run sqlsmith on it.

And i got a core dump after sometime of those things running.

The assertion that fails is:

LOG: statement: UPDATE pgbench_tellers SET tbalance = tbalance + 3519
WHERE tid = 34;
TRAP: FailedAssertion("!(((bool) (((const void*)(&tup->t_ctid) !=
((void *)0)) && (((&tup->t_ctid)->ip_posid & ((((uint16) 1) << 13) -
1)) != 0))))", File: "../../../../src/include/access/htup_details.h",
Line: 659)

Jaime Casanova
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Attachment Content-Type Size
warm_bt_20170413.txt text/plain 2.8 KB

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