Re: Perforamnce comparison between 2.3.8 and 2.2.10

Rajeev Atluri (rajeev@cc859044-a.flrtn1.occa.home.com)
Mon, 28 Jun 1999 15:20:20 -0700 (PDT)

These are some numbers I got a couple of days ago. I encountered no
accessing past end of device errors, or data curruption.

2.2.10//
cc# time cat /tmp/logs/*.log >all.log
0.26user 19.06system 1:57.68elapsed 16%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (175088major+96minor)pagefaults 47swaps

-rw-rw-r-- 1 root root 761660601 Jun 26 00:58 all.log

v2.3.9.prev4 kernel compile..
280.92user 16.58system 4:58.20elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (-1633536653major+1226620712minor)pagefaults 0swaps

2.3.9.pre4//
cc# time cat /tmp/logs/*.log >all.log
0.39user 18.50system 2:35.28elapsed 12%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (186088major+12minor)pagefaults 0swaps

-rw-r--r-- 1 root root 761660601 Jun 26 01:46 all.log

v2.3.9.prev4 kernel compile..
277.91user 15.98system 4:57.71elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (786573049major+1880080292minor)pagefaults 0swaps

Regards, Rajeev

On Mon, 28 Jun 1999, Stephen C. Tweedie wrote:

> Hi,
>
> On Sat, 26 Jun 1999 18:57:48 -0700 (PDT), Rudolf Leitgeb
> <leitgeb@variable.stanford.edu> said:
>
> > 2.2.10:
> > First test run: 285s user, 26.58s system, 3:30 elapsed
> > 2.3.8:
> > First test run: 298s user, 29.8s system, 3:44 elapsed
>
> > I also observed the following: While I did run into swap when I ran
> > the test under 2.2.10, swapping did not occur under 2.3.8. This makes
> > it even more surprising that 2.3.8 came out slower than 2.2.10,
> > especially after the announcement, that 2.3.8 came with speed
> > improvements for SMP systems.
>
> No, it sounds as if most of the difference is coming from the fact that
> 2.2.10 _did_ swap, and so had more memory to play with when it camt to
> doing useful work. Tuning this right is still an ongoing work for 2.3.
>
> --Stephen
>
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