gistfile1.rb

# zero-copy enable-disable test

require 'msgpack'
require 'benchmark'
LOOP = 100000

sizes = [10,100,1000,10000]
sizes.map! {|sz| [sz, MessagePack.pack("a"*sz)] }

Benchmark.benchmark(' ' * 30 + Benchmark::Tms::CAPTION, 30) do |b|
  sizes.each {|sz, raw|
    b.report("#{sz}") {
      LOOP.times { MessagePack.unpack(raw) }
    }
  }
end

##
## zero-copy is enabled:
##
#                                     user     system      total        real
# 10                              0.040000   0.000000   0.040000 (  0.052139)
# 100                             0.040000   0.010000   0.050000 (  0.044704)
# 1000                            0.040000   0.000000   0.040000 (  0.047488)
# 10000                           0.040000   0.000000   0.040000 (  0.040828)

##
## zero-copy is disabled:
##
#                                     user     system      total        real
# 10                              0.040000   0.000000   0.040000 (  0.050760)
# 100                             0.080000   0.020000   0.100000 (  0.091826)
# 1000                            0.100000   0.090000   0.190000 (  0.197389)
# 10000                           0.350000   0.930000   1.280000 (  1.298983)

## disable zero-copy patch
#
# diff --git a/ruby/unpack.c b/ruby/unpack.c
# index 0f1af38..021ffa4 100644
# --- a/ruby/unpack.c
# +++ b/ruby/unpack.c
# @@ -111,7 +111,15 @@ static inline int template_callback_map_item(unpack_user* u, VALUE* c, VALUE k,
#  { rb_hash_aset(*c, k, v); return 0; }
#  
#  static inline int template_callback_raw(unpack_user* u, const char* b, const char* p, unsigned int l, VALUE* o)
# -{ *o = (l == 0) ? rb_str_new(0,0) : rb_str_substr(u->source, p - b, l); return 0; }
# +{
# +       if(l == 0) {
# +               *o = rb_str_new(0,0);
# +       } else {
# +               *o = rb_str_new(p, l);
# +       }
# +       return 0;
# +}
# +//{ *o = (l == 0) ? rb_str_new(0,0) : rb_str_substr(u->source, p - b, l); return 0; }