Low-memory compile times

John Campbell (jcampbel@lynn.ci-n.com)
Wed, 22 Jul 1998 13:51:43 -0400 (EDT)

I've been "benchmarking" the various dev kernels on my 8M 386-40 by
doing a compile of the new kernel under 2.0.3[345] and then booting into the
new kernel and compiling the same kernel under itself. For the most part,
the compile speed has gotten progressively better since 2.1.91. 2.1.107 and
.108 were the best, taking only about 75% longer under 2.1 than under 2.0.
This isn't ideal, of course, but I'm willing to live with it to get some of
the new 2.1 features. 2.1.109 was a major step in the wrong direction. It
chewed on the compilation for over two days, and never did finish. I aborted
the compile when 2.1.110 came out. 2.1.110 is somewhat better, but still not
back to 2.1.108's level.

Here's "time make zImage" outputs for some of the recent kernels:

2.1.107 build under 2.0.34:

7852.19user 820.82system 4:10:05elapsed 57%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

2.1.107 build under 2.1.107:

8428.68user 1267.79system 7:28:49elapsed 36%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

My 2.1.108 results got lost in the shuffle, but they were similar to
2.1.107.

2.1.109 build under 2.0.35:
8112.93user 848.99system 4:19:35elapsed 57%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

2.1.109 build under 2.1.109:
Never finished. Working time greater than two days.

2.1.110 build under 2.0.35:

8115.44user 827.86system 4:21:57elapsed 56%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

2.1.110 build under 2.1.110:

8985.52user 1583.75system 10:57:00elapsed 26%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

---
John Campbell
jcampbel@lynn.ci-n.com


QotD:  The problem that we thought was a problem was, indeed, a problem, but
not the problem we thought was the problem.


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