![]() ![]() When OBJECT_MODE is set, it tells AIX's build utilities such as ar, as, and ld what type of objects to default to handling.īy default, overcommit of paging space can happen. (Options for xlc might differ.) If you omit the export of OBJECT_MODE, your build may fail with linker errors. PostgreSQL can also be rebuilt, passing configure LDFLAGS="-Wl,-bmaxdata:0x n0000000" to achieve the same effect.įor a 64-bit build, set OBJECT_MODE to 64 and pass CC="gcc -mai圆4" and LDFLAGS="-Wl,-bbigtoc" to configure. When you find a workable configuration, ldedit can be used to modify the binaries so that they default to using the desired heap size. This use of LDR_CNTRL tells AIX that you want the server to have MAXDATA bytes set aside for the heap, allocated in 256 MB segments. If a 32-bit binary is desired, set LDR_CNTRL to MAXDATA=0x n0000000, where 1 <= n <= 8, before starting the PostgreSQL server, and try different values and nf settings to find a configuration that works satisfactorily. The “ ideal” solution for this is to use a 64-bit build of PostgreSQL, but that is not always practical, because systems with 32-bit processors can build, but not run, 64-bit binaries. Since it isn't world-readable, the loader places the object into the process' heap instead of the shared library segments where it would otherwise be placed. Due to the permissions being set in this fashion, only the owner or a member of the possessing group can load the library. The binaries involved in that example were 32-bit and installed as mode 750 instead of 755. In the case of the plperl example, above, check your umask and the permissions of the binaries in your PostgreSQL installation. The default allows for less than 256 MB in the heap as it shares a single segment with the stack. ![]() These 32-bit processes are limited to 4 GB of memory laid out in 256 MB segments using one of a few models. This does not depend upon hardware type or kernel in use. By default, all binaries built on AIX are 32-bit. The overall cause of all these problems is the default bittedness and memory model used by the server process. Running as a non-owner in the group possessing the PostgreSQL installation:ĮRROR: could not load library "/opt/dbs/pgsql/lib/plperl.so": Bad addressĪnother example is out of memory errors in the PostgreSQL server logs, with every memory allocation near or greater than 256 MB failing. For example, running as the owner of the PostgreSQL installation:ĮRROR: could not load library "/opt/dbs/pgsql/lib/plperl.so": A memory address is not in the address space for the process. One example is loading of extensions failing with unusual errors. You can have a server with many multiples of gigabytes of RAM free, but still get out of memory or address space errors when running applications. AIX can be somewhat peculiar with regards to the way it does memory management. ![]()
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