Re: build.sh: set creation is serialized

[Andrew Doran <ad%netbsd.org@localhost>]

On Wed, Apr 30, 2008 at 08:29:02PM +0200, Julio M. Merino Vidal wrote:

> On Apr 30, 2008, at 20:12 , Andrew Doran wrote:
> 
> >In src/src/distrib/sets/Makefile:
> >
> >---
> >revision 1.56
> >date: 2007/03/10 20:34:57;  author: apb;  state: Exp;  lines: +5 -2
> >branches:  1.56.4;  1.56.10;  1.56.12;
> >Serialise making the "sets" tarballs in the maketars target.
> >On many systems, making them in parallel causes very poor
> >system performance due to disk I/O.  (Requested by jmmv.)
> >---
> >
> >On my development system this adds a lot of time to a release  
> >build, and I'd
> >like to revert it. My system is not affected, but if it were I  
> >don't see
> >why any of these would not be a valid solution:
> >
> >o use smaller value for -j
> >o analyze the problem on the affected systems
> >o buy more spindles
> 
> Affected system: laptop, -j2.  Problem analysis: slow disk.   
> Solution: none.  (Well, I upgraded to 7200RPM after that change was  
> made, but I am still pretty sure that parallel creation is slower  
> than serial one here.)
> 
> If you want to change it, could it be possible to add some optional  
> tunable to serialize the set creation?  That'd be enough for me.

Hmm. How much memory does this system have, and what is kern.maxvnodes?

Andrew