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Multiple segments on Linux/IDS v9.3

Posted in 2003

Topics: Server Administration

Dale Gilbert — — source: IIUG Forums & Mailing Lists

I am getting multiple virtual segments as below. I think the onconfig file is OK. Informix Dynamic Server Version 9.30.UC2 -- On-Line -- Up 00:01:25 -- 592780 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 753666 1381386241 10000000 332808192 224940 R 81224 28 1081356 1381386251 23d64000 268435456 8792 V 2537 62999 1343508 1381386259 33d64000 823296 632 M 177 24 1376277 1381386260 33e2d000 823296 632 M 170 31 1409046 1381386261 33ef6000 823296 632 M 170 31 1441815 1381386262 33fbf000 823296 632 M 170 31 1474584 1381386263 34088000 823296 632 M 170 31 1507353 1381386264 34151000 823296 632 M 170 31 1540122 1381386265 3421a000 823296 632 M 170 31 Total: - - 607006720 - - 84958 63237 Attached is the onconfig file. TIA

↪ replying to Dale Gilbert
Madison Pruet — — source: IIUG Forums & Mailing Lists

I thought that "M" class was for IPCSHM communications, not virtural shared memory segments. "Dale Gilbert" <dale@celestekats To: ids@iiug.org .com> cc: Sent by: Subject: Multiple segments on Linux/IDS v9.3 [1759] forum.subscriber@ iiug.org 08/26/2003 06:20 PM I am getting multiple virtual segments as below. I think the onconfig file is OK. Informix Dynamic Server Version 9.30.UC2 -- On-Line -- Up 00:01:25 -- 592780 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 753666 1381386241 10000000 332808192 224940 R 81224 28 1081356 1381386251 23d64000 268435456 8792 V 2537 62999 1343508 1381386259 33d64000 823296 632 M 177 24 1376277 1381386260 33e2d000 823296 632 M 170 31 1409046 1381386261 33ef6000 823296 632 M 170 31 1441815 1381386262 33fbf000 823296 632 M 170 31 1474584 1381386263 34088000 823296 632 M 170 31 1507353 1381386264 34151000 823296 632 M 170 31 1540122 1381386265 3421a000 823296 632 M 170 31 Total: - - 607006720 - - 84958 63237 Attached is the onconfig file. TIA

↪ replying to Dale Gilbert
Alexey Sonkin — — source: IIUG Forums & Mailing Lists

Dale, Your segments are not virtual segments. They are message segments. That is, You have much more shared memory connections than specified (or not specified and defaulted) by the NETTYPE parameter of Your $ONCONFIG Please, configure NETTYPE properly. Alexey -----Original Message----- From: Dale Gilbert [mailto:dale@celestekats.com] Sent: Tuesday, August 26, 2003 6:21 PM To: ids@iiug.org Subject: Multiple segments on Linux/IDS v9.3 [1759] I am getting multiple virtual segments as below. I think the onconfig file is OK. Informix Dynamic Server Version 9.30.UC2 -- On-Line -- Up 00:01:25 -- 592780 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 753666 1381386241 10000000 332808192 224940 R 81224 28 1081356 1381386251 23d64000 268435456 8792 V 2537 62999 1343508 1381386259 33d64000 823296 632 M 177 24 1376277 1381386260 33e2d000 823296 632 M 170 31 1409046 1381386261 33ef6000 823296 632 M 170 31 1441815 1381386262 33fbf000 823296 632 M 170 31 1474584 1381386263 34088000 823296 632 M 170 31 1507353 1381386264 34151000 823296 632 M 170 31 1540122 1381386265 3421a000 823296 632 M 170 31 Total: - - 607006720 - - 84958 63237 Attached is the onconfig file. TIA

↪ replying to Dale Gilbert
Stephanie_Peltier@txnp.uscourts.gov — — source: IIUG Forums & Mailing Lists

The multiple class "M" segments are not virtual memory segments but message segments. These are the message buffers that shared memory uses. This portion of shared memory is used for communication between your client applications and the database server. Check your sqlhosts file; we don't use shared memory connections here, but if I remember correctly, there will be one message segment per shared memory connection. Stephanie Peltier U. S. Probation Texas Northern District 214/753-2529 stephanie_peltier@txnp.uscourts.gov "Dale Gilbert" <dale@celestekats.com> Sent by: forum.subscriber@iiug.org 08/26/2003 06:20 PM To: ids@iiug.org cc: Subject: Multiple segments on Linux/IDS v9.3 [1759] I am getting multiple virtual segments as below. I think the onconfig file is OK. Informix Dynamic Server Version 9.30.UC2 -- On-Line -- Up 00:01:25 -- 592780 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 753666 1381386241 10000000 332808192 224940 R 81224 28 1081356 1381386251 23d64000 268435456 8792 V 2537 62999 1343508 1381386259 33d64000 823296 632 M 177 24 1376277 1381386260 33e2d000 823296 632 M 170 31 1409046 1381386261 33ef6000 823296 632 M 170 31 1441815 1381386262 33fbf000 823296 632 M 170 31 1474584 1381386263 34088000 823296 632 M 170 31 1507353 1381386264 34151000 823296 632 M 170 31 1540122 1381386265 3421a000 823296 632 M 170 31 Total: - - 607006720 - - 84958 63237 Attached is the onconfig file. TIA

↪ replying to Dale Gilbert
Michael Lowe — — source: IIUG Forums & Mailing Lists

Dale; Check your onconfig (I didn't see it attached) for a NETTYPE parameter for 'ipcshm'. The second parameter (e.g. "NETTYPE ipcshm,7,100,NET" or something similar), in this case the "7", specifies the number of poll threads for that communications protocol. For an ipcshm type connection, the number of poll threads is also the number of message segments the engine will create, thereby showing 7 shared memory segments for class "M". Because of the size of the segments, I'm guessing you have a lot of poll threads configured and not very many users per poll thread (parameter #3, in this case the '100') configured. You might consider 100-150 users per poll thread for SHM connections. HTH... Mike =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Mike Lowe Certified Consulting Education Specialist Data Management Solutions IBM Software Group Tel: 303-773-5216 Tie Line: 565-5216 e-Fax: 413-674-2415 mlowe0@us.ibm.com http://www.ibm.com/software/data "Dale Gilbert" <dale@celestekats To: ids@iiug.org .com> cc: Sent by: Subject: Multiple segments on Linux/IDS v9.3 [1759] forum.subscriber@ iiug.org 08/26/2003 05:20 PM I am getting multiple virtual segments as below. I think the onconfig file is OK. Informix Dynamic Server Version 9.30.UC2 -- On-Line -- Up 00:01:25 -- 592780 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 753666 1381386241 10000000 332808192 224940 R 81224 28 1081356 1381386251 23d64000 268435456 8792 V 2537 62999 1343508 1381386259 33d64000 823296 632 M 177 24 1376277 1381386260 33e2d000 823296 632 M 170 31 1409046 1381386261 33ef6000 823296 632 M 170 31 1441815 1381386262 33fbf000 823296 632 M 170 31 1474584 1381386263 34088000 823296 632 M 170 31 1507353 1381386264 34151000 823296 632 M 170 31 1540122 1381386265 3421a000 823296 632 M 170 31 Total: - - 607006720 - - 84958 63237 Attached is the onconfig file. TIA

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