Resident Segments marked as virtual

Hello everybody. I have IDS 7.31 FD6 running on AIX 5.3. For memory configuration I have the following parameters in the onconfig file: BUFFERS 2100000 (aprox. 8.4 GB) SHMVIRTSIZE 767000 SHMTOTAL 0 Now see the onstat -g seg output: Informix Dynamic Server Version 7.31.FD6XH -- On-Line -- Up 3 days 22:07:12 -- 9683936 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 188743687 1382041601 700000000000000 4294705152 94032 R 524256 0 11534341 1382041602 700000100000000 4294705152 66160 V 524256 0 22020104 1382041603 700000200000000 540360704 8872 V 65962 0 212860932 1382041604 700000230000000 785416192 12616 V 74397 21479 7340038 1382041605 700000260000000 1163264 648 M 134 8 Total: - - 9916350464 - - 1189005 21487 The first 4GB memory segment for BUFFERS is marked as Resident but the other two are marked as Virtual. Does anybody know why is this happening? Will The other two BUFFERS segments behave like virtual segments? Is there any Informix limitation that produces this? Any explanations are welcomed. E. A. Bispo

Bispo wrote: > Hello everybody. > > I have IDS 7.31 FD6 running on AIX 5.3. For memory configuration I have > the following parameters in the onconfig file: > > BUFFERS 2100000 (aprox. 8.4 GB) > SHMVIRTSIZE 767000 > SHMTOTAL 0> > Now see the onstat -g seg output: > > Informix Dynamic Server Version 7.31.FD6XH -- On-Line -- Up 3 days > 22:07:12 -- 9683936 Kbytes > > Segment Summary: > id key addr size ovhd class > blkused blkfree > 188743687 1382041601 700000000000000 4294705152 94032 R > 524256 0 > 11534341 1382041602 700000100000000 4294705152 66160 V > 524256 0 > 22020104 1382041603 700000200000000 540360704 8872 V > 65962 0 > 212860932 1382041604 700000230000000 785416192 12616 V > 74397 21479 > 7340038 1382041605 700000260000000 1163264 648 M > 134 8 > Total: - - 9916350464 - - > 1189005 21487 > > The first 4GB memory segment for BUFFERS is marked as Resident but the > other two are marked as Virtual. Does anybody know why is this > happening? Will The other two BUFFERS segments behave like virtual > segments? Is there any Informix limitation that produces this? > > Any explanations are welcomed. Per the Administrator's Reference (paraphrase) since the largest single shared memory segment is 4GB if you request > 4GB of BUFFERS the remainder is allocated in VIRTUAL segments. If you want those segments to also be marked as memory resident you can set RESIDENT 2 which will set the RESIDENT segment and the first VIRTUAL segment as memory resident in the OS. If you set RESIDENT -1 then all shared segments will be marked memory resident. Art S. Kagel