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Add example notebooks for c++ + openmp kernels
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‎notebooks/openmp-notebooks/hello_world.ipynb‎

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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 1,
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"id": "73cbab37-71dd-477d-981b-f2ec28c01bd6",
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"metadata": {},
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"outputs": [],
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"source": [
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"#include <stdio.h>\n",
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"#include <omp.h>\n",
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"#include <clang/Interpreter/CppInterOp.h>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"id": "ef1cd58a-672c-4a6f-843a-6c88fc4911f3",
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"metadata": {},
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"outputs": [],
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"source": [
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"Cpp::LoadLibrary(\"libomp\");\n",
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" "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"id": "c2b754ad-9553-4a42-b990-f990a9a269ed",
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"metadata": {},
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"outputs": [],
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"source": [
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"int main() {\n",
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" int max_threads = omp_get_max_threads();\n",
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"\n",
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" printf(\"max threads: %d\\n\", max_threads);\n",
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" omp_set_num_threads(max_threads);\n",
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"\n",
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"#pragma omp parallel\n",
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" {\n",
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" int id = omp_get_thread_num();\n",
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" printf(\"Hello World from thread = %d with %d threads\\n\", id, omp_get_num_threads());\n",
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" }\n",
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"\n",
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" printf(\"all done, with hopefully %d threads\\n\", max_threads);\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"id": "a37a13d4-fc82-496e-8f42-9e718a8c2aa0",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"max threads: 8\n",
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"Hello World from thread = 0 with 8 threads\n",
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"Hello World from thread = 3 with 8 threads\n",
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"Hello World from thread = 4 with 8 threads\n",
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"Hello World from thread = 2 with 8 threads\n",
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"Hello World from thread = 7 with 8 threads\n",
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"Hello World from thread = 1 with 8 threads\n",
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"Hello World from thread = 6 with 8 threads\n",
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"Hello World from thread = 5 with 8 threads\n",
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"all done, with hopefully 8 threads\n"
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]
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}
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],
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"source": [
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"main();"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "C++17 (xcpp+OpenMP)",
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"language": "cpp",
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"name": "xcpp17-omp"
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},
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"language_info": {
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"codemirror_mode": "text/x-c++src",
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"file_extension": ".cpp",
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"mimetype": "text/x-c++src",
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"name": "C++",
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"version": "17"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 5
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}

‎notebooks/openmp-notebooks/linked_list.ipynb‎

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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 1,
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"id": "156447d2-9279-45a0-890b-4e519d2c796b",
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"metadata": {},
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"outputs": [],
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"source": [
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"#include <stdlib.h>\n",
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"#include <stdio.h>\n",
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"#include <omp.h>\n",
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"#include <clang/Interpreter/CppInterOp.h>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"id": "c96fdeb0-817d-48c0-af8e-20a52947d60b",
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"metadata": {},
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"outputs": [],
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"source": [
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"#ifndef N\n",
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"#define N 5\n",
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"#endif\n",
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"#ifndef FS\n",
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"#define FS 38\n",
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"#endif"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"id": "8da842e1-db02-49e0-929d-4e67cbc08172",
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"metadata": {},
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"outputs": [],
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"source": [
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"Cpp::LoadLibrary(\"libomp\");"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"id": "22f97c49-78d1-496e-ac7c-978aed95331a",
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"metadata": {},
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"outputs": [],
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"source": [
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"struct node {\n",
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" int data;\n",
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" int fibdata;\n",
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" struct node *next;\n",
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"};"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"id": "b16b1e8a-8831-4b8d-9d57-09deeaaa88ee",
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"metadata": {},
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"outputs": [],
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"source": [
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"struct node *init_list(struct node *p);\n",
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"void processwork(struct node *p);\n",
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"int fib(int n);"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"id": "0ef8af6c-1d6f-4c68-84bc-3dd1d8092b06",
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"metadata": {},
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"outputs": [],
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"source": [
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"int fib(int n) {\n",
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" int x, y;\n",
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" if (n < 2) {\n",
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" return (n);\n",
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" } else {\n",
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" x = fib(n - 1);\n",
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" y = fib(n - 2);\n",
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" return (x + y);\n",
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" }\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"id": "1fa0307d-fdc9-4503-95cb-1c6448791354",
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"metadata": {},
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"outputs": [],
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"source": [
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"void processwork(struct node *p) {\n",
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" int n, temp;\n",
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" n = p->data;\n",
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" temp = fib(n);\n",
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"\n",
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" p->fibdata = temp;\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"id": "03acb599-9329-49ff-8aff-c0902adb6c3c",
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"metadata": {},
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"outputs": [],
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"source": [
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"struct node *init_list(struct node *p) {\n",
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" int i;\n",
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" struct node *head = NULL;\n",
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" struct node *temp = NULL;\n",
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"\n",
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" head = (struct node*) malloc(sizeof(struct node));\n",
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" p = head;\n",
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" p->data = FS;\n",
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" p->fibdata = 0;\n",
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" for (i = 0; i < N; i++) {\n",
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" temp = (struct node*) malloc(sizeof(struct node));\n",
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" p->next = temp;\n",
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" p = temp;\n",
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" p->data = FS + i + 1;\n",
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" p->fibdata = i + 1;\n",
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" }\n",
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"\n",
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" p->next = NULL;\n",
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" return head;\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"id": "f2dfb41b-e55f-43c0-b7f6-546a1697acb1",
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"metadata": {},
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"outputs": [],
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"source": [
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"int main() {\n",
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" double start, end;\n",
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" struct node *p = NULL;\n",
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" struct node *temp = NULL;\n",
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" struct node *head = NULL;\n",
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"\n",
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" printf(\"Process linked list\\n\");\n",
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" printf(\" Each linked list node will be processed by function 'processwork()'\\n\");\n",
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" printf(\" Each ll node will compute %d fibonacci numbers beginning with %d\\n\", N, FS);\n",
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"\n",
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" omp_set_num_threads(omp_get_max_threads());\n",
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"\n",
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" p = init_list(p);\n",
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" head = p;\n",
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"\n",
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" start = omp_get_wtime();\n",
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"\n",
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"#pragma omp parallel\n",
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" {\n",
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"#pragma omp master\n",
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" printf(\"Threads: %d\\n\", omp_get_num_threads());\n",
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"\n",
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"#pragma omp single\n",
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" {\n",
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" p = head;\n",
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" while (p) {\n",
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"#pragma omp task firstprivate(p) // first private is required\n",
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" {\n",
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" processwork(p);\n",
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" }\n",
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" p = p->next;\n",
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" }\n",
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" }\n",
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" }\n",
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"\n",
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" end = omp_get_wtime();\n",
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" p = head;\n",
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" while (p != NULL) {\n",
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" printf(\"%d : %d\\n\", p->data, p->fibdata);\n",
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" temp = p->next;\n",
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" free(p);\n",
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" p = temp;\n",
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" }\n",
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"\n",
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" free(p);\n",
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" printf(\"Compute Time: %f seconds\\n\", end - start);\n",
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"\n",
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" return 0;\n",
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"}"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"id": "353e5dfd-fcae-43e6-97e3-ec98070811a1",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Process linked list\n",
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" Each linked list node will be processed by function 'processwork()'\n",
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" Each ll node will compute 5 fibonacci numbers beginning with 38\n",
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"Threads: 8\n",
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"38 : 39088169\n",
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"39 : 63245986\n",
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"40 : 102334155\n",
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"41 : 165580141\n",
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"42 : 267914296\n",
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"43 : 433494437\n",
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"Compute Time: 2.617225 seconds\n"
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]
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}
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],
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"source": [
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"main();"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "C++17 (xcpp+OpenMP)",
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"language": "cpp",
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"name": "xcpp17-omp"
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},
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"language_info": {
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"codemirror_mode": "text/x-c++src",
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"file_extension": ".cpp",
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"mimetype": "text/x-c++src",
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"name": "C++",
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"version": "17"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 5
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}

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