realloc+write benchmark - vysledky patche

[Divacky Roman]

On Wed, Jan 28, 2004 at 07:35:35PM +0100, Radim Kolar wrote:
> > Dival jsem se na malloc/realloc kod v freebsd i v linuxu... nejsem na to
> > odbornik, ale zda se mi to priblizne stejne. akorat v fbsd se s tou zonou
> > primo
> ted mne napadlo ze to neni freebsd brk() vs linux brk() ale freebsd brk() vs
> linux remap(). Kdyz pominu usermode implementaci realloc( memcpy se pocita do
> user time), tak free bsd stejne spotrebovava neuveritelny pocet systemovyho
> casu ve srovnani s linuxem2.4. Ten rozdil je 21 vs 0.6 sec. To znamena ze
> algoritmus pro alokaci pameti je opravdu hodne pomaly.
> 
> Tezko rici zda se patch nejak projevila. Pokud ano, tak jen na hranici 
> meritelnosti.
 
ten patch je podle mne neco co se sice vyrazne neprojevi ale urcite ot neuskodi
 
> freebsd 5.2 kernel s patchi. -M zapisuje do narealokovane pameti, -m ne.
> ./forkbomb -l 64 -i 256 -M --quit  16.77s user 21.38s system 98% cpu 38.591 tota
> l
> ./forkbomb -l 64 -i 256 -M --quit  16.84s user 21.57s system 98% cpu 38.968 tota
> l
> ./forkbomb -l 64 -i 256 -M --quit  17.14s user 20.80s system 98% cpu 38.367 tota
> l
> ./forkbomb -l 64 -i 256 -M --quit  16.41s user 22.11s system 97% cpu 39.462 tota
> l
> ./forkbomb -l 64 -i 256 -M --quit >> forkbomb.patched  17.12s user 20.84s system
>  98% cpu 38.380 total
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  16.95s user 20.85s system 98% cpu
>  38.221 total
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  17.15s user 20.84s system 98% cpu
>  38.408 total
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  16.78s user 21.23s system 98% cpu
>  38.441 total
> =======================================
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m  --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  16.12s user 31.30s system 98% cpu
>  48.329 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m  --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  16.27s user 31.62s system 98% cpu
>  48.447 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m  --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  15.98s user 31.79s system 98% cpu
>  48.313 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m  --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  16.18s user 31.57s system 98% cpu
>  48.297 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m  --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  15.80s user 31.76s system 98% cpu
>  48.097 total
> //////////////////nepatchovany kernel///////////////////////
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  15.91s user 32.26s system 98% cpu
>  48.738 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  15.85s user 32.22s system 98% cpu
>  48.653 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  16.27s user 31.71s system 98% cpu
>  48.537 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  16.25s user 31.73s system 98% cpu
>  48.527 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  16.18s user 31.78s system 98% cpu
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  16.95s user 21.52s system 98% cpu
>  38.895 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  17.04s user 21.43s system 96% cpu
>  39.845 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  16.73s user 21.72s system 97% cpu
>  39.558 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  17.31s user 20.89s system 98% cpu
>  38.682 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  16.92s user 21.37s system 98% cpu
>  38.716 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  16.74s user 21.47s system 98% cpu
>  38.636 total
> (hsn at ttyv0):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  17.10s user 21.29s system 98% cpu
>  38.819 total
> 
> /////////////////////// linux 2.4 / glibc 2.3.2 \\\\\\\\\\\\\\\\\\\
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null 19:22
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  0.00s user 0.00s system 0% cpu 0.000 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null 19:22
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  0.00s user 0.00s system 0% cpu 0.000 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null 19:22
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  0.00s user 0.00s system 0% cpu 0.000 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null 19:22
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  0.00s user 0.00s system 0% cpu 0.000 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null 19:22
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  0.00s user 0.00s system 0% cpu 0.000 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -m --quit > /dev/null 19:22
> ./forkbomb -l 64 -i 256 -m --quit > /dev/null  0.00s user 0.00s system 0% cpu 0.000 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null 19:22
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  0.02s user 0.59s system 96% cpu 0.634 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null 19:24
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  0.01s user 0.60s system 95% cpu 0.637 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null 19:24
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  0.02s user 0.59s system 96% cpu 0.634 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null 19:24
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  0.02s user 0.59s system 96% cpu 0.633 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null 19:24
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  0.02s user 0.59s system 95% cpu 0.636 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null 19:24
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  0.04s user 0.57s system 96% cpu 0.633 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null 19:24
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  0.00s user 0.61s system 95% cpu 0.636 total
> (hsn at tty2):~/forkbomb% time ./forkbomb -l 64 -i 256 -M --quit > /dev/null 19:24
> ./forkbomb -l 64 -i 256 -M --quit > /dev/null  0.03s user 0.58s system 96% cpu 0.634 total
> -- 
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