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Re: Arm Akimbo SDLMAME ldesnogu #57752 01/08/10 11:30 PM
Joined: Mar 2001 Posts: 17,259 Likes: 267 USA R R. Belmont Very Senior Member
R. Belmont Very Senior Member R Joined: Mar 2001 Posts: 17,259 Likes: 267 USA	Nice. A9 sounds great on paper (shorter pipeline, out-of-order), can't wait to see real-world benchmarks.

Re: Arm Akimbo SDLMAME R. Belmont #57753 01/09/10 12:25 AM
Joined: Jul 2006 Posts: 87 L ldesnogu Member
ldesnogu Member L Joined: Jul 2006 Posts: 87	I don't have the right to quote numbers... The 25% speed increase in DMIPS over A8 quoted on ARM site isn't unusual. It's a really nice chip, but I'm very biased

Re: Arm Akimbo SDLMAME ldesnogu #57801 01/10/10 07:01 PM
Joined: Dec 2009 Posts: 24 F Flandry Member
Flandry Member F Joined: Dec 2009 Posts: 24	Alright, finally got back to sdlmame. The feeling completely lost was a bit off-putting. I installed the oprofile kernel module and userspace tools on my N900 and figured out all i have to do to generate the missing symbols is SYMBOLS=1... I have recorded a few profiles and will paste them momentarily. Adding an extra ~80 MB of size to the executable noticeably slows things down on its own, but i guess it's a rough guide. I was wondering if there's a simple way to disable certain drivers without breaking things. Nothing >1999 is going to run on the OMAP, anyway, and it would be nice to speed up building and reduce binary size. Also, do you have any suggestions on which ROMs are best for testing? Here's the breakdown of usage by the mame executable. Notably, the second highest usage was by pulseaudio. Setting no sound in the cfg must not be enough? Code 369990 68.1283 mame-symbols GPTIMER_CYCLES:16\| samples\| %\| ------------------ 331149 89.5021 mame-symbols 28745 7.7691 no-vmlinux 3605 0.9744 libc-2.5.so 1745 0.4716 libpulsecommon-0.9.15.so 1219 0.3295 libpulse.so.0.8.0 1159 0.3133 libpthread-2.5.so 1045 0.2824 libm-2.5.so 721 0.1949 libSDL-1.2.so.0.11.1 59717 10.9960 pulseaudio GPTIMER_CYCLES:16\| samples\| %\| ------------------ 19093 31.9725 no-vmlinux 16969 28.4157 module-nokia-voice.so 5997 10.0424 libpulsecommon-0.9.15.so 4573 7.6578 libpulsecore-0.9.15.so And here's the breakdown by function. Two big winners here are gfx related. Code Counted GPTIMER_CYCLES events (32KiHz timer clock cycles between interrupts) with a unit mask of 0x00 (No unit mask) count 16 samples % image name symbol name 108496 29.3240 mame-symbols drawsdl_rgb565_draw_quad_palette16_none 102284 27.6451 mame-symbols get_texel_palette16_nearest 30087 8.1318 mame-symbols ay8910_update 28745 7.7691 no-vmlinux /no-vmlinux 14177 3.8317 mame-symbols drawsdl_rgb565_draw_rect 4520 1.2217 mame-symbols generate_resampled_data 4345 1.1744 mame-symbols chan_calc 4170 1.1271 mame-symbols drawsdl_rgb565_draw_quad_argb32_alpha 3939 1.0646 mame-symbols cpu_execute_m6809 3605 0.9744 libc-2.5.so /lib/libc-2.5.so 3343 0.9035 mame-symbols cpu_execute_z80 3277 0.8857 mame-symbols read_byte_generic 2827 0.7641 mame-symbols advance_eg_channel This is for the Ghosts 'n Goblins ROM. I tried a few other older and slightly newer ROMs and every one runs at about 11% according to the message in xterm; i guess that's because those two drawing routines are overwhelmingly the bottleneck. Running the stripped binary from my last build it runs at about 33%. I'm building now with symbols and optimizations to see if it shows a different bottleneck. Last edited by Flandry; 01/10/10 07:51 PM.

Re: Arm Akimbo SDLMAME Flandry #57804 01/10/10 09:16 PM
Joined: Mar 2001 Posts: 17,259 Likes: 267 USA R R. Belmont Very Senior Member
R. Belmont Very Senior Member R Joined: Mar 2001 Posts: 17,259 Likes: 267 USA	That's not at all surprising - it indicates that the software renderer is eating your lunch. You need to get OpenGL running.

Re: Arm Akimbo SDLMAME R. Belmont #57809 01/10/10 10:55 PM
Joined: Dec 2009 Posts: 24 F Flandry Member
Flandry Member F Joined: Dec 2009 Posts: 24	Things look different with -o3: Code samples % image name symbol name 65701 46.2634 mame-o3-symbols drawsdl_rgb565_setup_and_draw_textured_quad 14508 10.2158 no-vmlinux /no-vmlinux 6459 4.5481 mame-o3-symbols ay8910_update 4897 3.4482 libc-2.5.so /lib/libc-2.5.so 4539 3.1961 mame-o3-symbols cpu_execute_z80 4522 3.1842 mame-o3-symbols ym2203_update_one 3393 2.3892 mame-o3-symbols drawsdl_rgb565_draw_rect That was quite the optimization... What exactly does that line mean: Average speed: 34.91% (42 seconds) Because it seemed to be running at full speed. Does that mean it was automatically dropping frames? What bits of armel conversion are you working on? Last edited by Flandry; 01/10/10 10:57 PM.

Re: Arm Akimbo SDLMAME Flandry #57811 01/10/10 11:10 PM
Joined: Mar 2001 Posts: 17,259 Likes: 267 USA R R. Belmont Very Senior Member
R. Belmont Very Senior Member R Joined: Mar 2001 Posts: 17,259 Likes: 267 USA	Heh, yeah, trying to profile unoptimized MAME is probably not worthwhile. Press F11 during the emulation to see frameskips and actual speed - 34.91% means precisely that you were only getting 1/3rd speed.

Re: Arm Akimbo SDLMAME Flandry #57816 01/11/10 01:49 AM
Joined: Feb 2003 Posts: 168 Mexico mangamuscle Senior Member
mangamuscle Senior Member Joined: Feb 2003 Posts: 168 Mexico	Originally Posted by Flandry Here's the breakdown of usage by the mame executable. Notably, the second highest usage was by pulseaudio. Setting no sound in the cfg must not be enough? If I remember correctly, two or more years ago MAME changed the nosound flag so that it only prevents you from hearing it, but it is still rendered (so it still uses cpu cycles).

Re: Arm Akimbo SDLMAME mangamuscle #57817 01/11/10 01:52 AM
Joined: Mar 2001 Posts: 17,259 Likes: 267 USA R R. Belmont Very Senior Member
R. Belmont Very Senior Member R Joined: Mar 2001 Posts: 17,259 Likes: 267 USA	Yeah, we had to do that because on a fair number of games the game won't run properly without the sound CPU (on Atari games it processes the coin inputs, for instance).

Re: Arm Akimbo SDLMAME R. Belmont #57863 01/11/10 07:19 PM
Joined: Jul 2006 Posts: 87 L ldesnogu Member
ldesnogu Member L Joined: Jul 2006 Posts: 87	You don't need to set SYMBOLS to 1 to get symbols, that's a MAME oddity Just add -g (and perhaps -fno-omit-frame-pointer for oprofile backtrace; I'm not sure whether it's needed or not) to CCOMFLAGS in the appropriate place. And also remove the stripping of the executable. As Arbee pointed out, you shouldn't waste profiling unoptimized code. Oh and BTW SDL is sometimes extremely crappy. On an emulator I was working on it was doing a stupid conversion that was eating 2/3 of the total time. Replacing the offending routine with my version made the blitting almost negligible. OTOH converting SDL OpenGL to OpenGL ES 2 probably is the way to go EDIT: contrary to a popular belief adding -g to gcc doesn't change anything to the quality of generated code. Last edited by ldesnogu; 01/11/10 07:21 PM.

Re: Arm Akimbo SDLMAME ldesnogu #58260 01/18/10 02:59 PM
Joined: Dec 2009 Posts: 24 F Flandry Member
Flandry Member F Joined: Dec 2009 Posts: 24	Hey exciting news with the closer tracking of upstream! I found that using an yuv overlay gives pretty good performance but the setup and drawing of the quad is still the highest single user of processor. Have you made a start on optimizing that for arm or implementing GL ES support that i would be duplicating? Most of the problems i have run into in the learning process here are due to weird/obsolete stuff in makefile, so hopefully the new merged project will clean that process up. If not i may submit some patches. Ldesnogu: did you get .136 to build with the extra extern var declaration added? I couldn't get it to link.

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