On 10/15/2013 10:01 PM, Jan Kratochvil wrote:
I have tested a possibly real world script:
rm *;sync;(time for i in `seq 0 89`;do mplayer &>/dev/null -nosound -vo png
-ss $i -endpos 0 video.mp4;mv 00000001.png $i.png;done) 2>&1|grep ^real|tee -a
/tmp/times
without prelink:
6.220s 6.212s 6.218s 7.463s 6.277s 6.216s 6.203s 6.255s 6.209s 6.205s
with prelink:
6.560s 6.496s 6.501s 6.530s 6.583s 6.616s 6.511s 6.498s 6.489s 6.915s
Uhm, I'm not actually sure which one is better. Prelinking appears
slower, but seems to offer more consistent performance.
If I interpret the result of R's t-test correctly, the difference is
hardly significant (the p-value is rather high):
without_prelink <- c(6.220, 6.212, 6.218, 7.463, 6.277, 6.216, 6.203,
6.255, 6.209, 6.205)
with_prelink <- c(6.560, 6.496, 6.501, 6.530, 6.583, 6.616, 6.511,
6.498, 6.489, 6.915)
> t.test(without_prelink, with_prelink)
Welch Two Sample t-test
data: without_prelink and with_prelink
t = -1.7004, df = 10.905, p-value = 0.1174
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
-0.50988354 0.06568354
sample estimates:
mean of x mean of y
6.3478 6.5699
--
Florian Weimer / Red Hat Product Security Team
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