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streams's Introduction

Abstract Stream Recording

Overview

This is very simple Erlang process messages recorder. We do simple flush with [append,write] of accumulated messages in process queue. This is future KVS backend for blockchain and transactional applications.

Features

  • Binary in-process accumulation
  • Process restarting on flush for stable memory and I/O usage
  • VBS -- variative buffer size for higher speeds
  • Hashing included in tests
  • OTP-less, pure Erlang code
  • HTTP API

Run

> writer:observe(3).
whereis writer: <0.239.0>
whereis writer: <0.249.0>
<0.261.0>: writer1: rate 192 MB/s messages 9966 in 1/1 sec
whereis writer: <0.263.0>
[ok,ok,ok]
<0.281.0>: writer2: rate 135 MB/s messages 9966 in 1/1 sec
<0.295.0>: writer3: rate 121 MB/s messages 9966 in 1/1 sec
<0.319.0>: writer1: rate 129 MB/s messages 19091 in 1/2 sec
<0.324.0>: writer2: rate 132 MB/s messages 13431 in 1/2 sec
<0.341.0>: writer3: rate 108 MB/s messages 12065 in 1/2 sec
<0.367.0>: writer2: rate 119 MB/s messages 13130 in 1/3 sec
<0.370.0>: writer1: rate 109 MB/s messages 12840 in 1/3 sec
<0.381.0>: writer3: rate 127 MB/s messages 10812 in 1/3 sec
<0.411.0>: writer1: rate 115 MB/s messages 10855 in 1/4 sec

Parameters

append = async | sync.

> application:set_env(streams,append,async).

signature = sha512 | sha256 | ripemd160 | none.

> application:set_env(streams,signature,sha512).

Credits

  • Maxim Sokhatsky

OM A HUM

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m-2k e42s salamandra7 erlang-cn

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