grapesjs-clot
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"mycustom-html": "<div id=\"iq9w\"><b id=\"iqcs\">Virtual Memory</b><b></b></div><div id=\"iq1l\" class=\"gjs-row\"><div id=\"ib8l\" class=\"gjs-cell\"><div id=\"ivqa3\"><span><b>1. 主要目的:</b><br/></span>允許process size在超過physical memory free space size之下，仍能執行。That is<span id=\"i3np5\"></span>, <span id=\"ighb3\">logical memory size不會受physical size之限制</span><font color=\"#f90000\" id=\"iheww\"><br id=\"ikl0j\"/></font><span id=\"iltsi\">2. 觀念:<br/></span>即是<span id=\"ilvz3\">"Partition loading"</span> process部分內容，process都可執行(even 不載入也可執行)<br/>- 早期: Dynamic loading觀念<br/>- 現代: OS提供Virtual Memory特性<br/><b>3. 其他附帶好處:<br/></b>a. 若process只載入部分即可執行，那表示同一時間可以載入的process數目會變多 => multiprogramming degree上升 => cpu utilization 相對高<br/>b. less I/O Time<br/><span id=\"iugp6\">(因為載入少，I/O transfer time會少)<br/></span>c. Memory utilization 相對高<br/>d. programmer無須煩惱process size太大之問題<br/>e. Copy-on-write技術speed up process creation<br/><br/></div><div id=\"igdof\"><span id=\"iwaj-2\" draggable=\"true\">實現Virtual Memory的技術之一: Demand Paging:<br/>1. Def: <br id=\"if0ur-2\" draggable=\"true\"/></span>架構在前面的Page Memory Management基礎<br/>差別: <br/><span id=\"ib8a3\">- process執行之前，無需事先載入全部的Pages，而是載入部分所需之Pages，即可執行</span><font color=\"#f90000\"><br/></font><span id=\"iztmh\">(也可以不載入任何Page即可執行，此為"pure demand paging"，若事先載入猜測的Pages，叫做"prepaging")<br/></span><span id=\"iltsi-2\" draggable=\"true\"><span id=\"iq9y6\">-</span><b draggable=\"true\" id=\"ix7uv\"> </b><span draggable=\"true\" id=\"iy7pq\">當process執行，若所需Page皆在Memory，則一切正常無誤<br/></span><span draggable=\"true\" id=\"ixhbv\">- 但若process企圖存取不再Memory中之Page，則產生Page fault，then OS必須處裡，將miss page載入Memory from Disk後，process才可往下執行<br/><b id=\"ijwh1\">2. 因此:</b></span><br id=\"ii6fs-2\" draggable=\"true\"/></span>必須有個機制區分那些pages在or不在Memory中，故page table會有一個欄位: <span id=\"i8xpi\">valid-Invalid Bit</span></div></div><div id=\"iukp\" class=\"gjs-cell\"><img id=\"ibvfc\" src=\"https://2.bp.blogspot.com/-n-_qs81sDyo/WZ7r0VY7bkI/AAAAAAABVX4/ZPLIVGyddkISiN8BOL3_2La-7UB0Bc9EACLcBGAs/s1600/9_01_VirtualMemoryLarger.jpg\"/></div></div>",
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Memory utilization 相對高\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"d. programmer無須煩惱process size太大之問題\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"e. Copy-on-write技術speed up process creation\"},{\"tagName\":\"br\",\"void\":true},{\"tagName\":\"br\",\"void\":true}]},{\"type\":\"text\",\"chooser\":\"DxkNb\",\"attributes\":{\"id\":\"igdof\"},\"components\":[{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"iwaj-2\",\"draggable\":\"true\"},\"components\":[{\"type\":\"textnode\",\"content\":\"實現Virtual Memory的技術之一: Demand Paging:\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"1. 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"mycustom-html": "<div id=\"iq9w\"><b id=\"iqcs\">Virtual Memory V1</b><b></b></div><div id=\"iq1l\" class=\"gjs-row\"><div id=\"ib8l\" class=\"gjs-cell\"><div id=\"ivqa3\"><span><b>1. 主要目的:</b><br/></span>允許process size在超過physical memory free space size之下，仍能執行。That is<span id=\"i3np5\"></span>, <span id=\"ighb3\">logical memory size不會受physical size之限制</span><font color=\"#f90000\" id=\"iheww\"><br id=\"ikl0j\"/></font><span id=\"iltsi\">2. 觀念:<br/></span>即是<span id=\"ilvz3\">"Partition loading"</span> process部分內容，process都可執行(even 不載入也可執行)<br/>- 早期: Dynamic loading觀念<br/>- 現代: OS提供Virtual Memory特性<br/><b>3. 其他附帶好處:<br/></b>a. 若process只載入部分即可執行，那表示同一時間可以載入的process數目會變多 => multiprogramming degree上升 => cpu utilization 相對高<br/>b. less I/O Time<br/><span id=\"iugp6\">(因為載入少，I/O transfer time會少)<br/></span>c. Memory utilization 相對高<br/>d. programmer無須煩惱process size太大之問題<br/>e. Copy-on-write技術speed up process creation<br/><br/></div><div id=\"igdof\"><span id=\"iwaj-2\" draggable=\"true\">實現Virtual Memory的技術之一: Demand Paging:<br/>1. Def: <br id=\"if0ur-2\" draggable=\"true\"/></span>架構在前面的Page Memory Management基礎<br/>差別: <br/><span id=\"ib8a3\">- process執行之前，無需事先載入全部的Pages，而是載入部分所需之Pages，即可執行</span><font color=\"#f90000\"><br/></font><span id=\"iztmh\">(也可以不載入任何Page即可執行，此為"pure demand paging"，若事先載入猜測的Pages，叫做"prepaging")<br/></span><span id=\"iltsi-2\" draggable=\"true\"><span id=\"iq9y6\">-</span><b draggable=\"true\" id=\"ix7uv\"> </b><span draggable=\"true\" id=\"iy7pq\">當process執行，若所需Page皆在Memory，則一切正常無誤<br/></span><span draggable=\"true\" id=\"ixhbv\">- 但若process企圖存取不再Memory中之Page，則產生Page fault，then OS必須處裡，將miss page載入Memory from Disk後，process才可往下執行<br/><b id=\"ijwh1\">2. 因此:</b></span><br id=\"ii6fs-2\" draggable=\"true\"/></span>必須有個機制區分那些pages在or不在Memory中，故page table會有一個欄位: <span id=\"i8xpi\">valid-Invalid Bit</span></div></div><div id=\"iukp\" class=\"gjs-cell\"><img id=\"ibvfc\" src=\"https://2.bp.blogspot.com/-n-_qs81sDyo/WZ7r0VY7bkI/AAAAAAABVX4/ZPLIVGyddkISiN8BOL3_2La-7UB0Bc9EACLcBGAs/s1600/9_01_VirtualMemoryLarger.jpg\"/></div></div>",
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Memory utilization 相對高\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"d. programmer無須煩惱process size太大之問題\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"e. Copy-on-write技術speed up process creation\"},{\"tagName\":\"br\",\"void\":true},{\"tagName\":\"br\",\"void\":true}]},{\"type\":\"text\",\"chooser\":\"DxkNb\",\"attributes\":{\"id\":\"igdof\"},\"components\":[{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"iwaj-2\",\"draggable\":\"true\"},\"components\":[{\"type\":\"textnode\",\"content\":\"實現Virtual Memory的技術之一: Demand Paging:\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"1. Def: \"},{\"tagName\":\"br\",\"type\":\"default\",\"void\":true,\"attributes\":{\"id\":\"if0ur-2\",\"draggable\":\"true\"}}]},{\"type\":\"textnode\",\"content\":\"架構在前面的Page Memory Management基礎\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"差別: \"},{\"tagName\":\"br\",\"void\":true},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"ib8a3\"},\"components\":[{\"type\":\"textnode\",\"content\":\"- process執行之前，無需事先載入全部的Pages，而是載入部分所需之Pages，即可執行\"}]},{\"tagName\":\"font\",\"attributes\":{\"color\":\"#f90000\"},\"components\":[{\"tagName\":\"br\",\"void\":true}]},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"iztmh\"},\"components\":[{\"type\":\"textnode\",\"content\":\"(也可以不載入任何Page即可執行，此為\\\"pure demand paging\\\"，若事先載入猜測的Pages，叫做\\\"prepaging\\\")\"},{\"tagName\":\"br\",\"void\":true}]},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"iltsi-2\",\"draggable\":\"true\"},\"components\":[{\"tagName\":\"span\",\"type\":\"text\",\"chooser\":\"4PuFJ\",\"attributes\":{\"id\":\"iq9y6\"},\"components\":[{\"type\":\"textnode\",\"content\":\"-\"}]},{\"tagName\":\"b\",\"type\":\"text\",\"attributes\":{\"draggable\":\"true\",\"id\":\"ix7uv\"},\"components\":[{\"type\":\"textnode\",\"content\":\" \"}]},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"draggable\":\"true\",\"id\":\"iy7pq\"},\"components\":[{\"type\":\"textnode\",\"content\":\"當process執行，若所需Page皆在Memory，則一切正常無誤\"},{\"tagName\":\"br\",\"void\":true}]},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"draggable\":\"true\",\"id\":\"ixhbv\"},\"components\":[{\"type\":\"textnode\",\"content\":\"- 但若process企圖存取不再Memory中之Page，則產生Page fault，then OS必須處裡，將miss page載入Memory from Disk後，process才可往下執行\"},{\"tagName\":\"br\",\"void\":true},{\"tagName\":\"b\",\"type\":\"text\",\"chooser\":\"3LTHQ\",\"attributes\":{\"id\":\"ijwh1\"},\"components\":[{\"type\":\"textnode\",\"content\":\"2. 因此:\"}]}]},{\"tagName\":\"br\",\"type\":\"default\",\"void\":true,\"attributes\":{\"id\":\"ii6fs-2\",\"draggable\":\"true\"}}]},{\"type\":\"textnode\",\"content\":\"必須有個機制區分那些pages在or不在Memory中，故page table會有一個欄位: \"},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"i8xpi\"},\"components\":[{\"type\":\"textnode\",\"content\":\"valid-Invalid Bit\"}]}]}]},{\"name\":\"Cell\",\"draggable\":\".gjs-row\",\"resizable\":{\"tl\":0,\"tc\":0,\"tr\":0,\"cl\":0,\"cr\":1,\"bl\":0,\"br\":0,\"minDim\":1,\"bc\":0,\"currentUnit\":1,\"step\":0.2},\"classes\":[{\"name\":\"gjs-cell\",\"private\":1}],\"attributes\":{\"id\":\"iukp\"},\"components\":[{\"type\":\"image\",\"attributes\":{\"id\":\"ibvfc\",\"src\":\"https://2.bp.blogspot.com/-n-_qs81sDyo/WZ7r0VY7bkI/AAAAAAABVX4/ZPLIVGyddkISiN8BOL3_2La-7UB0Bc9EACLcBGAs/s1600/9_01_VirtualMemoryLarger.jpg\"}}]}]}]",
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"date": "2022-03-06T14:53:08.137+00:00",
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"mycustom-html": "<div id=\"iq9w\"><b id=\"iqcs\">Virtual Memory V2</b><b></b></div><div id=\"iq1l\" class=\"gjs-row\"><div id=\"ib8l\" class=\"gjs-cell\"><div id=\"ivqa3\"><span><b>1. 主要目的:</b><br/></span>允許process size在超過physical memory free space size之下，仍能執行。That is<span id=\"i3np5\"></span>, <span id=\"ighb3\">logical memory size不會受physical size之限制</span><font color=\"#f90000\" id=\"iheww\"><br id=\"ikl0j\"/></font><span id=\"iltsi\">2. 觀念:<br/></span>即是<span id=\"ilvz3\">"Partition loading"</span> process部分內容，process都可執行(even 不載入也可執行)<br/>- 早期: Dynamic loading觀念<br/>- 現代: OS提供Virtual Memory特性<br/><b>3. 其他附帶好處:<br/></b>a. 若process只載入部分即可執行，那表示同一時間可以載入的process數目會變多 => multiprogramming degree上升 => cpu utilization 相對高<br/>b. less I/O Time<br/><span id=\"iugp6\">(因為載入少，I/O transfer time會少)<br/></span>c. Memory utilization 相對高<br/>d. programmer無須煩惱process size太大之問題<br/>e. Copy-on-write技術speed up process creation<br/><br/></div><div id=\"igdof\"><span id=\"iwaj-2\" draggable=\"true\">實現Virtual Memory的技術之一: Demand Paging:<br/>1. Def: <br id=\"if0ur-2\" draggable=\"true\"/></span>架構在前面的Page Memory Management基礎<br/>差別: <br/><span id=\"ib8a3\">- process執行之前，無需事先載入全部的Pages，而是載入部分所需之Pages，即可執行</span><font color=\"#f90000\"><br/></font><span id=\"iztmh\">(也可以不載入任何Page即可執行，此為"pure demand paging"，若事先載入猜測的Pages，叫做"prepaging")<br/></span><span id=\"iltsi-2\" draggable=\"true\"><span id=\"iq9y6\">-</span><b draggable=\"true\" id=\"ix7uv\"> </b><span draggable=\"true\" id=\"iy7pq\">當process執行，若所需Page皆在Memory，則一切正常無誤<br/></span><span draggable=\"true\" id=\"ixhbv\">- 但若process企圖存取不再Memory中之Page，則產生Page fault，then OS必須處裡，將miss page載入Memory from Disk後，process才可往下執行<br/><b id=\"ijwh1\">2. 因此:</b></span><br id=\"ii6fs-2\" draggable=\"true\"/></span>必須有個機制區分那些pages在or不在Memory中，故page table會有一個欄位: <span id=\"i8xpi\">valid-Invalid Bit</span></div></div><div id=\"iukp\" class=\"gjs-cell\"><img id=\"ibvfc\" src=\"https://2.bp.blogspot.com/-n-_qs81sDyo/WZ7r0VY7bkI/AAAAAAABVX4/ZPLIVGyddkISiN8BOL3_2La-7UB0Bc9EACLcBGAs/s1600/9_01_VirtualMemoryLarger.jpg\"/></div></div>",
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Memory utilization 相對高\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"d. programmer無須煩惱process size太大之問題\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"e. Copy-on-write技術speed up process creation\"},{\"tagName\":\"br\",\"void\":true},{\"tagName\":\"br\",\"void\":true}]},{\"type\":\"text\",\"chooser\":\"DxkNb\",\"attributes\":{\"id\":\"igdof\"},\"components\":[{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"iwaj-2\",\"draggable\":\"true\"},\"components\":[{\"type\":\"textnode\",\"content\":\"實現Virtual Memory的技術之一: Demand Paging:\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"1. Def: \"},{\"tagName\":\"br\",\"type\":\"default\",\"void\":true,\"attributes\":{\"id\":\"if0ur-2\",\"draggable\":\"true\"}}]},{\"type\":\"textnode\",\"content\":\"架構在前面的Page Memory Management基礎\"},{\"tagName\":\"br\",\"void\":true},{\"type\":\"textnode\",\"content\":\"差別: \"},{\"tagName\":\"br\",\"void\":true},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"ib8a3\"},\"components\":[{\"type\":\"textnode\",\"content\":\"- process執行之前，無需事先載入全部的Pages，而是載入部分所需之Pages，即可執行\"}]},{\"tagName\":\"font\",\"attributes\":{\"color\":\"#f90000\"},\"components\":[{\"tagName\":\"br\",\"void\":true}]},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"iztmh\"},\"components\":[{\"type\":\"textnode\",\"content\":\"(也可以不載入任何Page即可執行，此為\\\"pure demand paging\\\"，若事先載入猜測的Pages，叫做\\\"prepaging\\\")\"},{\"tagName\":\"br\",\"void\":true}]},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"iltsi-2\",\"draggable\":\"true\"},\"components\":[{\"tagName\":\"span\",\"type\":\"text\",\"chooser\":\"4PuFJ\",\"attributes\":{\"id\":\"iq9y6\"},\"components\":[{\"type\":\"textnode\",\"content\":\"-\"}]},{\"tagName\":\"b\",\"type\":\"text\",\"attributes\":{\"draggable\":\"true\",\"id\":\"ix7uv\"},\"components\":[{\"type\":\"textnode\",\"content\":\" \"}]},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"draggable\":\"true\",\"id\":\"iy7pq\"},\"components\":[{\"type\":\"textnode\",\"content\":\"當process執行，若所需Page皆在Memory，則一切正常無誤\"},{\"tagName\":\"br\",\"void\":true}]},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"draggable\":\"true\",\"id\":\"ixhbv\"},\"components\":[{\"type\":\"textnode\",\"content\":\"- 但若process企圖存取不再Memory中之Page，則產生Page fault，then OS必須處裡，將miss page載入Memory from Disk後，process才可往下執行\"},{\"tagName\":\"br\",\"void\":true},{\"tagName\":\"b\",\"type\":\"text\",\"chooser\":\"3LTHQ\",\"attributes\":{\"id\":\"ijwh1\"},\"components\":[{\"type\":\"textnode\",\"content\":\"2. 因此:\"}]}]},{\"tagName\":\"br\",\"type\":\"default\",\"void\":true,\"attributes\":{\"id\":\"ii6fs-2\",\"draggable\":\"true\"}}]},{\"type\":\"textnode\",\"content\":\"必須有個機制區分那些pages在or不在Memory中，故page table會有一個欄位: \"},{\"tagName\":\"span\",\"type\":\"text\",\"attributes\":{\"id\":\"i8xpi\"},\"components\":[{\"type\":\"textnode\",\"content\":\"valid-Invalid Bit\"}]}]}]},{\"name\":\"Cell\",\"draggable\":\".gjs-row\",\"resizable\":{\"tl\":0,\"tc\":0,\"tr\":0,\"cl\":0,\"cr\":1,\"bl\":0,\"br\":0,\"minDim\":1,\"bc\":0,\"currentUnit\":1,\"step\":0.2},\"classes\":[{\"name\":\"gjs-cell\",\"private\":1}],\"attributes\":{\"id\":\"iukp\"},\"components\":[{\"type\":\"image\",\"attributes\":{\"id\":\"ibvfc\",\"src\":\"https://2.bp.blogspot.com/-n-_qs81sDyo/WZ7r0VY7bkI/AAAAAAABVX4/ZPLIVGyddkISiN8BOL3_2La-7UB0Bc9EACLcBGAs/s1600/9_01_VirtualMemoryLarger.jpg\"}}]}]}]",
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