Informix

Could someone explain the distinction between these two sections? It's become relevant to a support case, and I can't get a useful answer from the documentation or first line support.

For example, on an example idle system, there are just two entries in Blkpool Summary. Showing that and entries with the same name in Pool Summary returns:

$ onstat -g mem | egrep 'Summary|^name |^mt |^global '
Pool Summary:
name                   class addr             totalsize        freesize         #allocfrag #freefrag
mt                               V     4903f040         20307968         71056            30620      1008
global                           V     4901d040         11796480         1267936          3562       295
Blkpool Summary:
name                             class addr             size             #blks
mt                               V     49041900         6307840          84
global                           V     4903c658         4096             1

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Doug Lawry
Oninit Consulting
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Hi Doug,

regular memory pools are a dynamically growing/shrinking collection of (4kB) random memory blocks, assigned to e.g. a session or a specific activity (of a session), with a somewhat complex internal structure allowing for 'used' and 'free' fragments book keeping.

Block pools, in contrast, consist of larger contiguous blocks of memory for certain purposes requiring large and e.g. page size aligned memory, e.g. a larger sort or also stacks, and without much internal structure - so just a large chunk of memory to use and to later discard as a whole once done with the task.

Hope this helps,
 Andreas

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Andreas Legner
Dev Engineer
HCL Software

Original Message:
Sent: Wed September 11, 2024 07:03 AM
From: Doug Lawry
Subject: "Pool Summary" versus "Blkpool Summary" in "onstat -g mem" output

Could someone explain the distinction between these two sections? It's become relevant to a support case, and I can't get a useful answer from the documentation or first line support.

For example, on an example idle system, there are just two entries in Blkpool Summary. Showing that and entries with the same name in Pool Summary returns:

$ onstat -g mem | egrep 'Summary|^name |^mt |^global '
Pool Summary:
name                   class addr             totalsize        freesize         #allocfrag #freefrag
mt                               V     4903f040         20307968         71056            30620      1008
global                           V     4901d040         11796480         1267936          3562       295
Blkpool Summary:
name                             class addr             size             #blks
mt                               V     49041900         6307840          84
global                           V     4903c658         4096             1

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Doug Lawry
Oninit Consulting
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