Changes after the lecture on Friday September 15th 2023

notebooks/julia_distributed.ipynb

@@ -614,6 +614,27 @@
     "take!(chnl)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "ff0da45d",
+   "metadata": {},
+   "source": [
+    "### This will not work!\n",
+    "\n",
+    "You really need remote channels to communicate different processes. Standard Channels would not work. For instance, the following code would block at the `take!`. Worker 4 will receive a different copy of the channel and will put values in it. The channel defined in the main process will remain empty and this will make the take! to block. \n",
+    "\n",
+    "```julia\n",
+    "chnl = Channel{Int}()\n",
+    "@spawnat 4 begin\n",
+    "    for i in 1:5\n",
+    "        put!(chnl,i)\n",
+    "    end\n",
+    "    close(chnl)\n",
+    "end\n",
+    "take!(chnl)\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "1b3f8dcc",
@@ -769,7 +790,7 @@
    "source": [
     "\n",
     "<div class=\"alert alert-block alert-success\">\n",
-    "<b>Question (Q1):</b>  How many integers are transferred between master and worker? Including both directions. \n",
+    "<b>Question (NB3-Q1):</b>  How many integers are transferred between master and worker? Including both directions. \n",
     "</div>\n",
     "\n",
     "\n",
@@ -803,7 +824,7 @@
    "metadata": {},
    "source": [
     "<div class=\"alert alert-block alert-success\">\n",
-    "<b>Question (Q2):</b>  How many integers are transferred between master and worker? Including both directions. \n",
+    "<b>Question (NB3-Q2):</b>  How many integers are transferred between master and worker? Including both directions. \n",
     "</div>\n",
     "\n",
     "\n",
@@ -838,7 +859,7 @@
    "source": [
     "\n",
     "<div class=\"alert alert-block alert-success\">\n",
-    "<b>Question (Q3):</b>  Which value will be the value of `x` ? \n",
+    "<b>Question (NB3-Q3):</b>  Which value will be the value of `x` ? \n",
     "</div>\n"
    ]
   },
@@ -862,7 +883,7 @@
    "metadata": {},
    "source": [
     "<div class=\"alert alert-block alert-success\">\n",
-    "<b>Question (Q4):</b>  Which value will be the value of `x` ? \n",
+    "<b>Question (NB3-Q4):</b>  Which value will be the value of `x` ? \n",
     "</div>\n",
     "\n",
     "Which value will be the value of `x` ?"
@@ -1309,7 +1330,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Julia 1.9.3",
+   "display_name": "Julia 1.9.0",
    "language": "julia",
    "name": "julia-1.9"
   },
@@ -1317,7 +1338,7 @@
    "file_extension": ".jl",
    "mimetype": "application/julia",
    "name": "julia",
-   "version": "1.9.3"
+   "version": "1.9.0"
   }
  },
  "nbformat": 4,