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