[Mplayer-dev-eng] Fwd: Benchmarks -largefiles

[Arpi]

Ok.
LGB?

--------- Forwarded message ---------
From: Stephen Davies <steve at daviesfam.org>
To: arpi at thot.banki.hu
Subject: Benchmarks -largefiles

Hi Arpi,

To try to put your mind at rest regarding performance impact of the
long-long's in the largefile patch, here are some benchmarks.

I tested three mplayer versions against a 30 minute, 4Mb/sec MPEG1 file -
first the standard source from cvs today:

BENCHMARKs: V: 267.756s VO:   0.000s A:   0.000s Sys:  39.712s =  307.469s
BENCHMARK%: V: 87.0841% VO:  0.0000% A:  0.0000% Sys: 12.9159% = 100.0000%
BENCHMARKs: V: 267.308s VO:   0.000s A:   0.000s Sys:  39.710s =  307.018s
BENCHMARK%: V: 87.0660% VO:  0.0000% A:  0.0000% Sys: 12.9340% = 100.0000%
BENCHMARKs: V: 267.364s VO:   0.000s A:   0.000s Sys:  39.519s =  306.883s
BENCHMARK%: V: 87.1224% VO:  0.0000% A:  0.0000% Sys: 12.8776% = 100.0000%

								921.370

Then, I applied the largefiles patch, but compiled with largefiles
disabled (consequently only code change being one or two conversions to
long long datatype.

Here are the results:

BENCHMARKs: V: 267.451s VO:   0.000s A:   0.000s Sys:  39.810s =  307.261s
BENCHMARK%: V: 87.0435% VO:  0.0000% A:  0.0000% Sys: 12.9565% = 100.0000%
BENCHMARKs: V: 267.371s VO:   0.000s A:   0.000s Sys:  39.804s =  307.174s
BENCHMARK%: V: 87.0420% VO:  0.0000% A:  0.0000% Sys: 12.9580% = 100.0000%
BENCHMARKs: V: 267.856s VO:   0.000s A:   0.000s Sys:  39.494s =  307.351s
BENCHMARK%: V: 87.1500% VO:  0.0000% A:  0.0000% Sys: 12.8500% = 100.0000%

					.046% diff		921.786

0.046% slower - I doubt that this is statistically siginificant even.

I then compiled with 64bit file offsets enabled:

BENCHMARKs: V: 267.376s VO:   0.000s A:   0.000s Sys:  39.753s =  307.128s
BENCHMARK%: V: 87.0567% VO:  0.0000% A:  0.0000% Sys: 12.9433% = 100.0000%
BENCHMARKs: V: 268.210s VO:   0.000s A:   0.000s Sys:  39.557s =  307.767s
BENCHMARK%: V: 87.1470% VO:  0.0000% A:  0.0000% Sys: 12.8530% = 100.0000%
BENCHMARKs: V: 267.135s VO:   0.000s A:   0.000s Sys:  39.894s =  307.029s
BENCHMARK%: V: 87.0066% VO:  0.0000% A:  0.0000% Sys: 12.9934% = 100.0000%

					.060% diff	       921.924

0.060% slower.

Hope that that satisfies you with respect to performance?  If you feel its
still an issue I'll find you a 1% saving somewhere else - thats 20 times
as much ;-)

Regards,
Steve




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