krestenkrab

Keybase proof

I hereby claim:

• I am krestenkrab on github.
• I am drkrab (https://keybase.io/drkrab) on keybase.
• I have a public key ASBs-18J2gBlouOQMVkDDMJQ9jmqLyKGC5cnhj673sSfHgo

To claim this, I am signing this object:

krestenkrab

hashtree.erl optimization ideas

On-disk format for segment data

The current on-disk format is that each KV is stored in the tree file as

<<$t,TreeId:22/binary,$s,Segment:64/integer,Key/binary>>

TreeId is 22 bytes (20 bytes from the vnode id, and 2 bytes for N value). The implementation in hashtree uses 1M segments, and the Segment is stored in a 64 bit unsiged. Finally, the Key is usually term_to_binary({Bucket,Key}).

krestenkrab

message Person {
  required int32 id = 1;
  required string name = 2;
  optional string email = 3;
  repeated Address addresses = 4;

  extensions 10 to max;
}

message Address {

krestenkrab

#!/bin/bash

echo Building Google Protobuf for Mac OS X / iOS.
echo Use 'tail -f build.log' to monitor progress.

(
PREFIX=`pwd`/protobuf
mkdir ${PREFIX}
mkdir ${PREFIX}/platform

krestenkrab

Oct 06, 2013 11:26:10 AM erjang.EModuleManager$FunctionInfo$1 invoke
INFO: MISSING 'Elixir.Foo.Bar.Baz':sum/2
Oct 06, 2013 11:26:10 AM erjang.EModuleManager$FunctionInfo$1 invoke
INFO: MISSING 'Elixir.Foo.Bar.Baz':sum/2
tokenizer_test: chars_test...*failed*
in function tokenizer_test:chars_test/0 (tokenizer_test.erl, line 146)
**error:{badmatch,[{number,1,48350}]}


=======================================================

krestenkrab

-module(to_ulf).

-include_lib("hanoidb/include/hanoidb.hrl").

first(Ref) ->
    case hanoidb:fold_range(Ref,fun(K,V,Acc) -> [{K,V}|Acc] end,[],
                    #key_range{from_key= <<>>, limit=1, to_key=undefined})
    of
        [] -> '$end_of_table';
        [{Key,Value}] -> {Key,Value}

krestenkrab

In addition to erlang R16B02, you need a more recent bash because the scripts use bash associative arrays; a feature which is not present in the version of bash distributed with MacOS X.

brew install node
brew install bash

## put new bash on path
export PATH=/usr/local/bin:$PATH

krestenkrab

Krestens-MacBook-Pro:elixir krab$ make test_kernel -f Makefile.e
==> elixir (compile)
==> kernel (exunit)

Elixir.URITest
  * decode (0.5ms)
  * decode_query (8.1ms)
  * decoder (0.5ms)
  * default_port (0.7ms)
  * downcase_scheme (0.8ms)

krestenkrab

R16B01 @ x86_64-apple-darwin12.4.0, 1000000 iterations
    when matching: binary is 55.46651865727732% faster
when not matching: binary is 17.42297571085909% faster
[{214705,'Foo.List'},
 {177297,'Foo.Bin'},
 {345924,'Elixir.List'},
 {154052,'Elixir.Bin'}]

krestenkrab

Krestens-MacBook-Pro:elixir krab$ make test -f Makefile.e
==> elixir (compile)
Compiled src/elixir_compiler.erl
==> kernel (compile)
Compiled lib/elixir/lib/application/behaviour.ex
Compiled lib/elixir/lib/bitwise.ex
Compiled lib/elixir/lib/behaviour.ex
Compiled lib/elixir/lib/access.ex
Compiled lib/elixir/lib/dict/behaviour.ex
Compiled lib/elixir/lib/code.ex