Is this the tybalt89 optimization? ... or is there another optimization I missed?

Yes.

It takes 32 logical cores for your Perl/MCE version to catch up to my C++ version 1.0. Is that right?

That was done using 16 physical and 16 logical CPU cores via taskset -c 0-15,32-47. BTW, I captured the UNIX time to include any global cleanup. It now takes the entire CPU (64 logical threads) for Perl MCE 1.0 to run faster. :) The Perl time includes launching Perl, loading modules, spawning and reaping workers (~ 0.06 secs).

# captured UNIX time
C++ 1.0          : 0.450s
C++ fast_io      : 0.291s
Perl MCE 64 thds : 0.252s

[download]

I tried also, an ARRAY for indexed-based lookups. But, that runs slower. Edit: Tried unpack, tip by tybalt89. ARRAY lookup is now faster.

# HASH
my %rtoa = ( M=>1000, D=>500, C=>100, L=>50, X=>10, V=>5, I=>1 );

# ARRAY, characters M  D  C  L  X  V  I
my @rtoa; @rtoa[qw( 77 68 67 76 88 86 73 )] = qw( 1000 500 100 50 10 5
+ 1 );

Perl MCE 64 thds : 0.252s  @rtoa{ split //, uc($_) };
Perl MCE 64 thds : 0.297s  @rtoa[ map ord, split //, uc($_) ];
Perl MCE 64 thds : 0.192s  @rtoa[ unpack 'c*', uc($_) ];

[download]

In reply to Re^3: Risque Romantic Rosetta Roman Race - Tried Array Lookup by marioroy
in thread Risque Romantic Rosetta Roman Race by eyepopslikeamosquito

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