Re: Dynamic Tracing docs

Simon Riggs wrote On 12/02/06 06:50,:

>Robert, Can you throw any light on this? Or do you have any further
>comments on the docs?
>http://developer.postgresql.org/pgdocs/postgres/dynamic-trace.html
>
>
Here is what the dtrace man page says about the -32 and -64 flags:

         The D compiler produces programs using the  native  data
         model  of  the  operating system kernel. You can use the
         isainfo -b command to determine  the  current  operating
         system  data  model.  If  the  -32  option is specified,
         dtrace forces the D compiler  to  compile  a  D  program
         using the 32-bit data model. If the -64 option is speci-
         fied, dtrace forces the D compiler to compile a  D  pro-
         gram using the 64-bit data model. These options are typ-
         ically not required as dtrace selects  the  native  data
         model  as  the default. The data model affects the sizes
         of integer types and other language properties.  D  pro-
         grams  compiled for either data model can be executed on
         both 32-bit and 64-bit kernels. The -32 and -64  options
         also determine the ELF file format (ELF32 or ELF64) pro-
         duced by the -G option.

In my testing on the 64 bit Solaris kernel building a 64-bit Postgres
binary, if DTRACEFLAGS="-64" is not passed to the configure script,
compilation will fail when dtrace is invoked. Based on my observation,
dtrace will default to 32-bit, but for 64-bit you have to be explicit
with DTRACEFLAGS="-64"

Simon, thanks for you help with the doc patch!

Regards,
-Robert