Hi! I have a simple one-line patch to enable the use of multiple CPUs or cores when building with MSVC. It is only inside the C compiler itself, but it makes about a 30-35% reduction in compile time on a fairly CPU-limited dual-CPU VM. It would probably do a lot more on for example a quadcore. It pushes the CPU to 100% when building the larger projects like postgres.exe and psql.exe, but obviously stays a lot lower for building all the small single-file projects, since it's only the C compiler that uses it.
I can measure no performance decrease on single-core CPUs. Probably because the switch makes the compiler figure out how many CPUs that are available... Since we only support one compiler (Visual Studio 2005) for this, I see the risk of this as very low. The only downside is if you use this on a development machine, it will use up all your CPU whereas previously it used only one core. I haven't even seen normal operations on the machine slow down thouhg... I'm going to apply this for HEAD. I'm considering backpatching as well, to speed up all build machines. Comments on that? -- Magnus Hagander Self: http://www.hagander.net/ Work: http://www.redpill-linpro.com/ -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
