Looking for speed increases in "make index" and pkg_version for
ports
Stephen Montgomery-Smith
stephen at math.missouri.edu
Tue May 29 02:13:40 UTC 2007
Roman Divacky wrote:
> On Mon, May 28, 2007 at 11:34:24AM -0500, Stephen Montgomery-Smith wrote:
>> Jeremy Chadwick wrote:
>>> On Sun, May 27, 2007 at 03:52:16PM -0500, Stephen Montgomery-Smith wrote:
>>>> I have been thinking a lot about looking for speed increases for "make
>>>> index" and pkg_version and things like that. So for example, in
>>>> pkg_version, it calls "make -V PKGNAME" for every installed package. Now
>>>> "make -V PKGNAME" should be a speedy operation, but the make has to load
>>>> in and analyze bsd.port.mk, a quite complicated file with about 200,000
>>>> characters in it, when all it is needing to do is to figure out the
>>>> value of the variable PKGNAME.
>>> I have a related question, pertaining to "make all-depends-list" and the
>>> utter atrocity that is the make variable ALL-DEPENDS-LIST. If you don't
>>> know what it is, look for ^ALL-DEPENDS-LIST around line 5175, in
>>> bsd.ports.mk.
>> I posted this to ports at freebsd.org, but now I am realizing that it is
>> hackers at freebsd.org that gets more responses. Anyway, here is a
>> multithreaded program "all-depends-list" that can get you double the
>> speed on dual processor systems, and even some small speed gains on
>> single processor systems. E.g.
>>
>> all-depends-list /usr/ports/x11/xorg
>>
>> http://www.math.missouri.edu/~stephen/all-depends-list.c
>
> btw.. stehpen, when are you getting a commit bit? :) I certainly hope that soon enough ;)
Probably not. The program seems to have a bug in it. In particular, I
didn't read the fgetln man page sufficiently well. So think of it as a
proof of concept rather than a finished product.
I'm going to rest from this stuff for a while, but I enjoyed the
exchanges and it has given me encouragement to work on it again in the
future sometime.
Stephen
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