[gambit-list] Comparing a 2020 iPhone SE to a 7-year-old Linux box

Marc Feeley feeley at iro.umontreal.ca
Sun May 24 08:01:29 EDT 2020


Nice!  That reminds me that the Gambit REPL and Not Emacs iOS apps should be updated to the latest version of Gambit so that people can use the features added in the last 5 years.  In particular, the new module system could be used to easily customize Gambit REPL into apps with their own UI.  The version for Android would be good to update too but I don’t have control over that (last update was ~ 9 years ago).

Marc



> On May 24, 2020, at 12:20 AM, Bradley Lucier <lucier at purdue.edu> wrote:
> 
> The Linux box is running Ubuntu 18.04 with
> 
> model name	: Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
> 
> and Gambit was compiled with
> 
> v4.9.3-1111-g05060cf0 20200521224855 x86_64-pc-linux-gnu "./configure 'CC=/usr/local/gcc-10.1.0/bin/gcc -march=native -D___CAN_IMPORT_CLIB_DYNAMICALLY' '--enable-strict-aliasing' '--enable-single-host' '--enable-shared' '--enable-multiple-versions'"
> 
> The iPhone SE is running the Gambit REPL app, based on Gambit 4.7.4.
> 
> The comparison is very simple, I run
> 
> gsi -e '(define a (time (expt 3 100000000)))(pp (time (integer-length (* a a))))'
> (time (expt 3 100000000))
>    2.663234 secs real time
>    2.633248 secs cpu time (2.434250 user, 0.198998 system)
>    8 collections accounting for 0.020154 secs real time (0.006686 user, 0.012848 system)
>    1210688 bytes allocated
>    272088 minor faults
>    no major faults
> (time (integer-length (* a a)))
>    2.877121 secs real time
>    2.869723 secs cpu time (2.665860 user, 0.203863 system)
>    1 collection accounting for 0.019379 secs real time (0.000000 user, 0.018940 system)
>    85536 bytes allocated
>    272140 minor faults
>    no major faults
> 316992501
> 
> on the Linux box, the times on the iPhone SE are 2.759 seconds for the first computation and 2.990 seconds for the second.
> 
> If I look at an older build of Gambit on the Linux box, with
> 
> v4.9.1 20180930122740 x86_64-unknown-linux-gnu "./configure 'CC=gcc -march=native -D___CAN_IMPORT_CLIB_DYNAMICALLY' '--enable-single-host' '--enable-shared' '--enable-multiple-versions'"
> 
> i.e., with an older compiler and without --enable-strict-aliasing, then I see
> 
> gsi -e '(define a (time (expt 3 100000000)))(pp (time (integer-length (* a a))))'
> (time (expt 3 100000000))
>    3.328249 secs real time
>    3.327808 secs cpu time (3.103869 user, 0.223939 system)
>    8 collections accounting for 0.019851 secs real time (0.004052 user, 0.015809 system)
>    1213248 bytes allocated
>    272088 minor faults
>    no major faults
> (time (integer-length (* a a)))
>    3.572195 secs real time
>    3.571591 secs cpu time (3.335618 user, 0.235973 system)
>    1 collection accounting for 0.020848 secs real time (0.000757 user, 0.020061 system)
>    85536 bytes allocated
>    272140 minor faults
>    no major faults
> 316992501
> 
> i.e., the iPhone is undeniably faster.
> 
> I heard a rumor that Apple will start shipping Arm-based Macbook laptops with CPUs of its own design, maybe not the Macbook Pros, just the Macbook Airs.  That certainly doesn't look unreasonable.
> 
> Brad
> 
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