On 2013-03-01 10:50, Ian Smith wrote:
At 256MB - the minimum earlier that completed installation without disabling CTL - swap often sat at ~14MB but blew out to around 165MB building those huge llvm libraries - cc1plus 332M, 173M resident was one top I snipped, but I can't say I caught the biggest.
I had top running throughout a build and saw cc1plus reach 460 MB with 171MB resident, at that point CPU was down to about 4% and the system was hammering swap. As a testament to FreeBSD's robustness, I could still log in via ssh, start screened shells, and generally conduct admin tasks while cc1plus beat the crap out of my VM. Even start and stop other services.
Then I added 128MB (to 384MB) and repeated the first buildworld (incl. clang) expecting huge savings as it'd only touched swap to about 12MB a time or two, mostly having 100MB+ of free memory .. wow, down to 7h02m!
For 9.x, I changed my notes to "256 MB to run, 768 MB to build". For 8.x, the numbers were 192 MB to run, 512 MB to build.
Here at least, building llvm libs and clang doubles buildworld time! and extends /usr/obj from 675MB to 1GB.
I'll be doing `make buildkernel buildworld` ET and size comparisons between RELENG_8_3 and RELENG_9_1 when I test out my buildbox. I'd like to gather memory usage metrics as well, if someone knows some tricks for that. My current approach is somewhat crude. :) If there's interest I'll follow up with the results here.
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