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Informix - Problem description

Problem IT35218 Status: Closed

SEARCH OF SDS PAGING FILE IS INEFFICIENT FOR LARGE FILE SIZES

product:
INFORMIX SERVER / 5725A3900 / E10 - 
Problem description:
When the size of a paging file on an SDS server becomes large
(millions of pages) more time is consumed by threads as the file
is searched. Such threads may be observed to be in a running
state for extended periods of time as they search the page file
or wait to acquire the spin lock to start the search. Using the
onmode -X stack command or an OS command to capture the stack of
the running thread may show:

sdcloneFindPage_Int
sdcloneFindPage
chunkio_sdCloneRead
chunkio
physio
ra_submit_ios
ra_do_pagelist_req
readahead_daemon
th_init_initgls
startup

The above stack is an example from a readahead thread. Stacks
from other threads are also possible and all will have the
function sdcloneFindPage_Int in common near to the top of the
stack.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC6.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 14.10.xC6 (when available).       *
****************************************************************
Local Fix:
Solution
Workaround
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC6.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 14.10.xC6 (when available).       *
****************************************************************
Comment
Fixed in Informix Server 14.10.xC6.
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
09.12.2020
11.05.2021
11.05.2021
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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