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14.10.xC10
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Informix - Problem description

Problem IT41654	Status: Closed
MASSIVE PARALLEL ACTIVITY TO THE SAME TABLE CAN CREATE A BOTTEKNECK ON MUTEX WAIT PT_PARTNUM
product:
INFORMIX SERVER / 5725A3900 / E10 -
Problem description:
When we try to do a massive parallel activity on the same table it can create a bottleneck "mutex wait pt_partnum" IBM Informix Dynamic Server Version 14.10.FC8 -- On-Line -- Up 1 days 20:01:47 -- 239764 Kbytes 355 4eaf5d90 46d6e128 1 mutex wait pt_1001e7 13cpu sqlexec 356 47c3fd90 46d74428 1 cond wait netnorm 13cpu sqlexec 357 4faa1d48 46d64828 1 mutex wait pt_1001e7 13cpu sqlexec 358 4ea94178 46d70e28 1 cond wait netnorm 13cpu sqlexec 359 4ee6e0d0 46d6d828 1 running 9cpu sqlexec 360 4ee83808 46d63f28 1 mutex wait pt_1001e7 13cpu sqlexec 361 4ee6c958 46d6bd28 1 mutex wait pt_1001e7 13cpu sqlexec 362 4ee66a00 46d6ab28 1 mutex wait pt_1001e7 13cpu sqlexec 363 4ee82178 46d73b28 1 mutex wait pt_1001e7 13cpu sqlexec 364 4ee5f8b0 46d71728 1 cond wait netnorm 12cpu sqlexec 365 4eebf028 46d60028 1 mutex wait pt_1001e7 1cpu sqlexec 366 4ee93760 46d6a228 1 cond wait netnorm 1cpu sqlexec 367 4ec5c028 46d69928 1 mutex wait pt_1001e7 13cpu sqlexec 368 4ecfd610 46d63628 1 mutex wait pt_1001e7 13cpu sqlexec 369 4ebd8d48 46d6cf28 1 cond wait netnorm 13cpu sqlexec 370 4eb514c0 46d6b428 1 running 1cpu sqlexec 371 4eb99bf8 46d6f328 1 cond wait netnorm 12cpu sqlexec 372 4eaec370 46d61b28 1 cond wait netnorm 13cpu sqlexec 373 4eb72aa8 46d5f728 1 running 11cpu sqlexec 374 4ed1a220 46d73228 1 running 10cpu sqlexec 375 4ed52958 46d60928 1 mutex wait pt_1001e7 13cpu sqlexec 376 506740d0 46d6c628 1 running 14cpu sqlexec 377 5024e808 46d72928 1 mutex wait pt_1001e7 13cpu sqlexec 378 50331028 46d70528 1 cond wait netnorm 1cpu sqlexec 379 5029a6b8 46d6ea28 1 cond wait netnorm 12cpu sqlexec 380 502be028 46d65128 1 cond wait netnorm 13cpu sqlexec 381 50620568 46d72028 1 running 12cpu sqlexec 382 5036cca0 46d6fc28 1 cond wait netnorm 14cpu sqlexec 383 50361418 46d66328 1 mutex wait pt_1001e7 13cpu sqlexec 384 51fdad00 46d61228 1 running 8cpu sqlexec IBM Informix Dynamic Server Version 14.10.FC8 -- On-Line -- Up 1 days 20:01:49 -- 239764 Kbytes 355 4eaf5d90 46d6e128 1 mutex wait pt_1001e6 10cpu sqlexec 356 47c3fd90 46d74428 1 mutex wait pt_1001e6 8cpu sqlexec 357 4faa1d48 46d64828 1 mutex wait pt_1001e6 1cpu sqlexec 358 4ea94178 46d70e28 1 mutex wait pt_1001e6 8cpu sqlexec 359 4ee6e0d0 46d6d828 1 mutex wait pt_1001e6 8cpu sqlexec 360 4ee83808 46d63f28 1 running 13cpu sqlexec 361 4ee6c958 46d6bd28 1 mutex wait pt_1001e6 14cpu sqlexec 362 4ee66a00 46d6ab28 1 mutex wait pt_1001e6 12cpu sqlexec 363 4ee82178 46d73b28 1 mutex wait pt_1001e6 13cpu sqlexec 364 4ee5f8b0 46d71728 1 mutex wait pt_1001e6 8cpu sqlexec 365 4eebf028 46d60028 1 mutex wait pt_1001e6 8cpu sqlexec 366 4ee93760 46d6a228 1 running 11cpu sqlexec 367 4ec5c028 46d69928 1 mutex wait pt_1001e6 1cpu sqlexec 368 4ecfd610 46d63628 1 mutex wait pt_1001e6 13cpu sqlexec 369 4ebd8d48 46d6cf28 1 mutex wait pt_1001e6 12cpu sqlexec 370 4eb514c0 46d6b428 1 mutex wait pt_1001e6 10cpu sqlexec 371 4eb99bf8 46d6f328 1 mutex wait pt_1001e6 1cpu sqlexec 372 4eaec370 46d61b28 1 running 9cpu sqlexec 373 4eb72aa8 46d5f728 1 mutex wait pt_1001e6 8cpu sqlexec 374 4ed1a220 46d73228 1 mutex wait pt_1001e6 12cpu sqlexec 375 4ed52958 46d60928 1 mutex wait pt_1001e6 10cpu sqlexec 376 506740d0 46d6c628 1 mutex wait pt_1001e6 8cpu sqlexec 377 5024e808 46d72928 1 mutex wait pt_1001e6 8cpu sqlexec 378 50331028 46d70528 1 mutex wait pt_1001e6 1cpu sqlexec 379 5029a6b8 46d6ea28 1 mutex wait pt_1001e6 12cpu sqlexec 380 502be028 46d65128 1 mutex wait pt_1001e6 1cpu sqlexec 381 50620568 46d72028 1 mutex wait pt_1001e6 12cpu sqlexec 382 5036cca0 46d6fc28 1 mutex wait pt_1001e6 10cpu sqlexec 383 50361418 46d66328 1 mutex wait pt_1001e6 8cpu sqlexec 384 51fdad00 46d61228 1 mutex wait pt_1001e6 10cpu sqlexec I am able to reproduce on a table with (10) fragments and without fragments. I see larger no of mutex wait for a particular select query on a single table with or without fragment. for f in run/stk*;do awk '/mt_lock $/{i=1;next}i{print ;n++; i--}END{print "Sum: " n}' $f\|sort\|uniq -c; echo; done 25 0x00000001001addc0 (oninit)isenter 23 0x00000001001af4cc (oninit)rspsclose 8 0x00000001001b53e0 (oninit)IPRA.$flfree 4 0x00000001001b6430 (oninit)get_leadpartp 10 0x00000001001ca44c (oninit)ptfree 9 0x00000001001cc3c4 (oninit)ptalloc 1 Sum: 79 11 0x00000001001addc0 (oninit)isenter 28 0x00000001001af4cc (oninit)rspsclose 14 0x00000001001b53e0 (oninit)IPRA.$flfree 11 0x00000001001b6430 (oninit)get_leadpartp 6 0x00000001001ca44c (oninit)ptfree 12 0x00000001001cc3c4 (oninit)ptalloc 1 Sum: 82 20 0x00000001001addc0 (oninit)isenter 27 0x00000001001af4cc (oninit)rspsclose 7 0x00000001001b53e0 (oninit)IPRA.$flfree 9 0x00000001001b6430 (oninit)get_leadpartp 4 0x00000001001ca44c (oninit)ptfree 16 0x00000001001cc3c4 (oninit)ptalloc 1 Sum: 83
Problem Summary:
**************************************************************** * USERS AFFECTED: * * Users of Informix Server prior to 14.10.FC10. * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to Informix Server 14.10.FC10. * ****************************************************************
Local Fix:

Solution

Workaround
**************************************************************** * USERS AFFECTED: * * Users of Informix Server prior to 14.10.FC10. * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to Informix Server 14.10.FC10. * ****************************************************************
Comment
Fixed in Informix Server 14.10.FC10.
Timestamps
Date - problem reported : Date - problem closed : Date - last modified :	01.08.2022 22.02.2023 22.02.2023
Problem solved at the following versions (IBM BugInfos)

Problem solved according to the fixlist(s) of the following version(s)