problem during the compilation for ids 7.31UD1 running on linux

Happy Day, I have a problem during the compilation for my object code. during the compilation it was running half-way then it stop in my online.log file it showing the error as below: 07:48:15 Dynamically allocated new virtual shared memory segment (size 8192KB) 07:48:15 Dynamically allocated new virtual shared memory segment (size 8192KB) 07:48:15 Dynamically allocated new virtual shared memory segment (size 8192KB) 07:48:15 Dynamically allocated new virtual shared memory segment (size 8192KB) 07:48:15 Dynamically allocated new virtual shared memory segment (size 8192KB) 07:48:15 Dynamically allocated new virtual shared memory segment (size 8192KB) 07:48:15 shmat: [22]: operating system error 07:48:15 Assert Failed: errors occurred during mt_notifyvp 07:48:15 Informix Dynamic Server Version 7.31.UD1 07:48:15 Who: Session(269, informix@linuxsvr3.rhs.net, 28615, 401815616) Thread(299, sqlexec, 17f0f4d0, 1) File: mt.c Line: 9518 07:48:19 See Also: /tmp/af.51342be 07:48:19 mt.c, line 9518, thread 299, proc id 20703, errors occurred during mt_ notifyvp. 07:48:19 PANIC: Attempting to bring system down p/s: May i know due to what problem is't ? I have a 4 GB of memory swap also 4 GB and 2 CPU. in my onconfig file I set the SHMVIRTSIZE 100000 and SHMADD 8192. anything that i need to modifty in my onconfig file ? please advice Thanks Best Regards, LIM

Dear Jim, SHMVIRTSIZE should be set to a value that is a bit higher than the amount of used memory during 'normal' operations. To determine this amount : - When the system has been running for a while with normal load run the command 'onstat -g seg' and search for all segments of class 'V' (for virtual) - add up all the values in column blkused mulitply the result with the block size. The block size is either 4096 or 8192 bytes , depending on you IDS version. As far as I know it is 8192 for 7.31.UD1 . This is the virtual memory currently in use by IDS in Bytes . # To verify the block size : (<blkused>+ <blkfree>) * <block size> = <size_of_shm_segment> - Set SHMVIRTSIZE to an amount a bit larger (maybe 20%) than that value. ! The value in $ONCONFIG is in KB, the above calculation returns # of bytes. - Generally SHMVIRTSIZE should be set to a value , that normally dynamic allocation of additional SHM segments does not take place. - SHMADD should be set to a reasonable high value , to avoid the allocation of many small SHM segments in case the server has to allocate more SHM segments! 8192 is definitely very low. On the other hand if it is set very high , this may result in the allocation of an unnecessary high amount of memory. ----------------------------------------------------------------------------- Example from a 7.31.UC7 on SOLARIS: 13% onstat -g seg Informix Dynamic Server Version 7.31.UC7XA8 -- On-Line -- Up 00:00:24 -- 917504 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 1075 1381386241 a000000 872415232 14188 R* 105530 966 1076 1381386242 3e000000 67108864 1628 V 7293 899 1077 1381386243 42000000 622592 616 M 68 8 Total: - - 940146688 - - 112891 1873 (* segment locked in memory) ONCONFIG: ------------------ SHMVIRTSIZE 65536 #in KB SHMADD 65536 #in KB There is only one virtual segment here. Size is blkused blkfree (7293 + 899) * 8192 = 67108864 Which indeed is the size displayed by onstat, so we verified that 8192 is the block size! In this case SHMVIRTSZE seems to be reasonable, as there is still some free space available , while it is not oversized on the other hand. -------------------------------------------------------------------------------- ----------------------------- The crash seems to be a consequence of an OS error. With kind regards Tilman -- Tilman Model-Bosch IBM Data Managment Solutions, Informix Advanced Support c\\\\o SAP AG TECHDEV 05 Neurrotstr.16 69190 Walldorf forum.subscriber@iiug.org wrote on 04/29/2004 02:17:02 AM: > Happy Day, > > I have a problem during the compilation for my object code. during the > compilation it was running half-way then it stop in my online.log file > it showing the error as below: > > 07:48:15 Dynamically allocated new virtual shared memory segment (size > 8192KB) > > 07:48:15 Dynamically allocated new virtual shared memory segment (size > 8192KB) > > 07:48:15 Dynamically allocated new virtual shared memory segment (size > 8192KB) > > 07:48:15 Dynamically allocated new virtual shared memory segment (size > 8192KB) > > 07:48:15 Dynamically allocated new virtual shared memory segment (size > 8192KB) > > 07:48:15 Dynamically allocated new virtual shared memory segment (size > 8192KB) > > 07:48:15 shmat: [22]: operating system error > 07:48:15 Assert Failed: errors occurred during mt_notifyvp > 07:48:15 Informix Dynamic Server Version 7.31.UD1 > 07:48:15 Who: Session(269, informix@linuxsvr3.rhs.net, 28615, > 401815616) > Thread(299, sqlexec, 17f0f4d0, 1) > File: mt.c Line: 9518 > 07:48:19 See Also: /tmp/af.51342be > 07:48:19 mt.c, line 9518, thread 299, proc id 20703, errors occurred > during mt_ > notifyvp. > 07:48:19 PANIC: Attempting to bring system down > > p/s: May i know due to what problem is't ? I have a 4 GB of memory swap > also 4 GB and 2 CPU. > > in my onconfig file I set the SHMVIRTSIZE 100000 and SHMADD 8192. > anything that i need to modifty in my onconfig file ? please advice > > Thanks > Best Regards, > LIM > > >