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Wondering how fast it could build Android 4.0. (http://source.android.com/source/building.html http://source.android.com/source/building.html) Bit of a pun inte

by ypcx 15y ago

Wondering how fast it could build Android 4.0. (http://source.android.com/source/building.html http://source.android.com/source/building.html) Bit of a pun intended. I have recently realized that a 4-core smarthpone, one of those coming in mid-2012, on a 1.5 GHz (e.g. the rumored HTC Edge) theoretically packs similar power to that of my dual-core Macbook Pro 2.8 GHz (4x1.5=6 vs. 2.8x2=5.6). One probably cannot compare OMAP with x86 too much, but still, the CPU developments in mobile space excite me more than the desktop ones, which frankly, disappoint me a bit. Somehow, sometime in 2000s I expected to have massively parallel CPU sometime around now, not a mere 6-core.

piinbinary 15y ago
A desktop CPU probably has about an order of magnitude more power per cycle than a mobile chip. They have bigger caches (less time spent waiting for memory), more logic units, deeper pipelines, and can handle far more 'in-flight' instructions. That said, the smart phones of today probably do have more power than desktop computers of about 10 years ago. edit: now that I think about it, a order of magnitude is probably generous, but I would still guess that it's at least a factor > 2.
- ypcx 15y ago
  I don't have time to get better data, i.e. I couldn't find any MFLOPS data for a mobile CPU (not GPU), so just quickly unscientifically: Texas Instruments OMAP4460 (in Galaxy Nexus at 1,2 GHz): 2047.7 BogoMIPS 1.7 GHz Xeon from 2006 (the small EC2 instance, single-core): 5203.55 BogoMIPS Would be interesting to see some real benchmarks though..
  - justincormack 15y ago
    You dont want flops figures - no floating point is used to compile. Bogomips lives up to its name. I suspect that compiling has fairly poor locality and is quite cache dependent, so you might be better off just benchmarking on a mobile cpu.
    - xal 15y ago
      Not a great test either but better then the above: Geekbench 2 on iPhone 4S: 617 Geekbench 2 32bit on iMac i7 @ 2.80GHz: 8557

by ypcx 15y ago

piinbinary 15y ago

A desktop CPU probably has about an order of magnitude more power per cycle than a mobile chip. They have bigger caches (less time spent waiting for memory), more logic units, deeper pipelines, and can handle far more 'in-flight' instructions. That said, the smart phones of today probably do have more power than desktop computers of about 10 years ago. edit: now that I think about it, a order of magnitude is probably generous, but I would still guess that it's at least a factor > 2.

ypcx 15y ago
I don't have time to get better data, i.e. I couldn't find any MFLOPS data for a mobile CPU (not GPU), so just quickly unscientifically: Texas Instruments OMAP4460 (in Galaxy Nexus at 1,2 GHz): 2047.7 BogoMIPS 1.7 GHz Xeon from 2006 (the small EC2 instance, single-core): 5203.55 BogoMIPS Would be interesting to see some real benchmarks though..
- justincormack 15y ago
  You dont want flops figures - no floating point is used to compile. Bogomips lives up to its name. I suspect that compiling has fairly poor locality and is quite cache dependent, so you might be better off just benchmarking on a mobile cpu.
  - xal 15y ago
    Not a great test either but better then the above: Geekbench 2 on iPhone 4S: 617 Geekbench 2 32bit on iMac i7 @ 2.80GHz: 8557