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      "title": "The Actor Model",
      "body": "@@ -1170,17 +1170,20 @@\n . Actor%0A\n-%09\n+---%0A\n %EA%B0%81%EA%B0%81%EC%9D%98 acto\n@@ -1233,18 +1233,17 @@\n %EA%B0%80 %ED%95%A0%EB%8B%B9%EB%90%9C%EB%8B%A4. \n-%0A%09\n+ \n actor%EA%B0%80 %EA%B0%80\n@@ -1276,18 +1276,17 @@\n %EC%97%86%EA%B8%B0 %EB%95%8C%EB%AC%B8%EC%97%90, \n-%0A%09\n+ \n actor%EA%B0%84%EC%97%90 \n@@ -1327,18 +1327,17 @@\n %ED%96%89%EB%8F%99%EC%9D%84 %ED%95%9C %ED%9B%84,\n-%0A%09\n+ \n %EB%8B%A4%EC%8B%9C %EB%8B%A4%EC%9D%8C ac\n@@ -1351,16 +1351,17 @@\n %EC%A7%80%EB%A5%BC %EB%B3%B4%EB%82%B8%EB%8B%A4.%0A\n+%0A\n !%5Bactor-\n",
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      "body": "#  Actor Model...\n\n> 1973년 칼 휴이트가 제안한 개념이며,  행위자를  병행 연산의 범용적 기본 단위로 취급하는 병행  컴퓨팅의 수학적 모델이다.\n\n\n###  1. 변해가는 환경\n\tSingle Thread -> Multi Thread -> Multi Core -> Multi Machine\n\n### 2. 병렬처리 문제점\n>프로그램은 병렬처리가 가능한 부분과 불가능한 순차적인 부분으로 구성되므로 프로세서를 아무리 병렬화 시켜도 더 이상 성능이 향상되지 않는 한계가 존재 한다는 법칙\n\n* reference : http://parkcheolu.tistory.com/34\n\n### 3.  So far, Architecture\n##### A. 3-Tier Architecture\n\t* Stateless frontends\n\t* Stateless midle tier\n\t* Storage is the bottleneck\n\t\t* Latency\n\t\t* Throughput\n\t\t* Scalability\n\t* Horizontal calls are problematic\n\t* Date shipping (paradigm)\n##### B. Cache Tier for Performance & Scalability\n\t* Much better performance\n\t* Lost semantics of storage\n\t* Lost concurrency control\n\t* Horizontal calls are still\n\t\tproblematic\n\t* Still data shipping ( paradigm)\n![enter image description here](https://lh3.googleusercontent.com/3-gnpf1rL1PR4JNkM0h8Yd2F_v561Y6roIAXsvPu7qWJTGm4EQFu67i7VvHIRS_nzODG9IQG1yS4 \"3tier-Architecture\")\n\n---\n\n\n\n### 4. The Actor Model\n - 1973년 Hewitt, Bishop, Steiger가 발표함.\n - Concurrenct Coputational Theory\n    (그문제를 해결할수 있느냐?, 그 문제를 해결할때 어떤방법이 가장좋은가?)\n\n - Actor은 메시지를 수신하고, 동작을 수행함.(메시지를 받고, 보내고, status 를 가질수 있다.)\n\n### 5. Actor\n\t각각의 actor는 내부에 상태와 행동을 가지고 있으며, mailbox라고 불리는 queue가 할당된다. \n\tactor가 가진 상태는 숨겨져 있어서 외부에서는 파악할 수 없기 때문에, \n\tactor간에 서로 메시지를 주고받으면서 수신한 메시지에 대해 각각 정의돈 행동을 한 후,\n\t다시 다음 actor로 메시지를 보낸다.\n![actor-model에 대한 이미지 검색결과](https://www.brianstorti.com/assets/images/actors.png)",
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