Re: speed up port compiling using RAM (tmpfs) ???

Kris Kennaway wrote:

On Thu, Jan 19, 2006 at 05:32:58PM -0500, Gary Thorpe wrote:

Ashok Shrestha wrote:

I mounted part of RAM as such:

mdmfs -s 500m md /mnt

Then put WRKDIRPREFIX=/path/to/md in /etc/make.conf.

It substantially reduces compile time by about 5-10 times.


Thanx to all ur replies.

-Ashok Shrestha

An alternative is to try using the "-pipe" flag with GCC: this eliminates the need to use some temporary files by using a unix pipe for IPC. Setting another flag "-j 2" will allow 2 jobs to be done at the same time and should eliminate (by hiding) the I/O delays (this slows down the CPU slightly because of more task switches, but even with one job there are still lots of generated tasks). 


-j is not safe to use with port builds since many ported software
contain race conditions in the build.

Kris

This effectively means that you cannot take advantage of SMP to compile FreeBSD's ports collection. That sounds like a big limitation...especially for people trying to speed up bulk builds.

Is "-pipe" still a good idea? It should provide a significant performance boost, if the process is spending a lot of time doing disk I/O, without using up a lot of memory.
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