source code
// The Computer Language Benchmarks Game
// https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
//
// Contributed by Jeremy Zerfas
// Based on the C++ program from Jon Harrop, Alex Mizrahi, and Bruno Coutinho.
// *reset*
// This controls the width of lines that are output by this program.
#define MAXIMUM_LINE_WIDTH 60
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
typedef off_t off64_t; // This is needed to keep APR happy on 32 bit systems.
#include <apr_pools.h>
// intptr_t should be the native integer type on most sane systems.
typedef intptr_t intnative_t;
typedef struct tree_node{
struct tree_node * left_Node, * right_Node;
} tree_node;
// Create a binary tree of depth tree_Depth in memory_Pool, set the root node's
// value to root_Node_Value, and finally return a pointer to the created binary
// tree.
static inline tree_node * create_Tree(const intnative_t tree_Depth,
apr_pool_t * const memory_Pool){
tree_node * const root_Node=apr_palloc(memory_Pool, sizeof(tree_node));
// If tree_Depth is one or more then recursively call create_Tree() in order
// to create the left and right subtrees using 2*root_Node_Value-1 and
// 2*root_Node_Value respectively as the root values for those subtrees.
if(tree_Depth>0){
root_Node->left_Node=create_Tree(tree_Depth-1, memory_Pool);
root_Node->right_Node=create_Tree(tree_Depth-1, memory_Pool);
}else
root_Node->left_Node=root_Node->right_Node=NULL;
return root_Node;
}
// Compute and return the checksum for the binary tree that has root_Node as the
// root node.
static inline intnative_t compute_Tree_Checksum(
const tree_node * const root_Node){
// If there are subtrees then recursively call compute_Tree_Checksum() on
// them and factor their values into the checksum, otherwise just return
// the value of root_Node.
if(root_Node->left_Node)
return compute_Tree_Checksum(root_Node->left_Node)+
compute_Tree_Checksum(root_Node->right_Node)+1;
else
return 1;
}
int main(int argc, char ** argv){
// Set minimum_Tree_Depth to 4 and maximum_Tree_Depth to the maximum of what
// was specified as the argument to the program and minimum_Tree_Depth+2.
const intnative_t minimum_Tree_Depth=4;
intnative_t maximum_Tree_Depth=atoi(argv[1]);
if(maximum_Tree_Depth < minimum_Tree_Depth+2)
maximum_Tree_Depth=minimum_Tree_Depth+2;
apr_initialize();
apr_pool_t * memory_Pool;
// Create a memory pool, create a binary tree of depth maximum_Tree_Depth+1,
// compute the checksum of the binary tree, print the statistics, and then
// delete the memory pool.
apr_pool_create_unmanaged(&memory_Pool);
tree_node * stretch_Tree=create_Tree(maximum_Tree_Depth+1, memory_Pool);
printf("stretch tree of depth %jd\t check: %jd\n",
(intmax_t)maximum_Tree_Depth+1,
(intmax_t)compute_Tree_Checksum(stretch_Tree));
apr_pool_destroy(memory_Pool);
// Create a memory pool and then create a long-lived binary tree of depth
// maximum_Tree_Depth which will be left alone for a while while
// more binary trees get allocated and deallocaited as required by the
// rules. We'll finish working with this later.
apr_pool_create_unmanaged(&memory_Pool);
tree_node * long_Lived_Tree=create_Tree(maximum_Tree_Depth, memory_Pool);
// Create a lot of binary trees in parallel of depths ranging from
// minimum_Tree_Depth to maximum_Tree_Depth, compute and tally up all their
// checksums, destroy the trees, and then record the statistics to
// output_Buffer[] so they can be displayed in order later.
char output_Buffer[maximum_Tree_Depth+1][MAXIMUM_LINE_WIDTH+1];
intnative_t current_Tree_Depth;
#pragma omp parallel for
for(current_Tree_Depth=minimum_Tree_Depth;
current_Tree_Depth<=maximum_Tree_Depth; current_Tree_Depth+=2){
intnative_t iterations=1<<(maximum_Tree_Depth-current_Tree_Depth+
minimum_Tree_Depth);
// Create a memory pool for this thread to use.
apr_pool_t * thread_Memory_Pool;
apr_pool_create_unmanaged(&thread_Memory_Pool);
intnative_t i=1, total_Trees_Checksum=0;
for(; i<=iterations; ++i){
// Create a binary tree of depth current_Tree_Depth
tree_node * const tree_1=create_Tree(current_Tree_Depth,
thread_Memory_Pool);
total_Trees_Checksum+=compute_Tree_Checksum(tree_1);
apr_pool_clear(thread_Memory_Pool);
}
apr_pool_destroy(thread_Memory_Pool);
// Record the statistics for the trees of depth current_Tree_Depth.
sprintf(output_Buffer[current_Tree_Depth],
"%jd\t trees of depth %jd\t check: %jd\n", (intmax_t)iterations,
(intmax_t)current_Tree_Depth, (intmax_t)total_Trees_Checksum);
}
// Print the statistics for all of the various tree depths.
for(current_Tree_Depth=minimum_Tree_Depth;
current_Tree_Depth<=maximum_Tree_Depth; current_Tree_Depth+=2)
printf("%s", output_Buffer[current_Tree_Depth]);
// Compute the checksum of the long-lived binary tree that we created
// earlier, print the statistics, and then delete the memory pool.
printf("long lived tree of depth %jd\t check: %jd\n",
(intmax_t)maximum_Tree_Depth,
(intmax_t)compute_Tree_Checksum(long_Lived_Tree));
apr_pool_destroy(memory_Pool);
apr_terminate();
return 0;
}
notes, command-line, and program output
NOTES:
64-bit Ubuntu quad core
Intel(R) C Intel(R) 64 Compiler
for applications running on Intel(R) 64,
Version 19.1.1.217 Build 20200306
Copyright (C) 1985-2020 Intel Corporation. All rights reserved.
FOR NON-COMMERCIAL USE ONLY
Mon, 04 May 2020 21:11:31 GMT
MAKE:
/opt/src/intel/bin/icc -pipe -Wall -O3 -fomit-frame-pointer -march=core2 -fopenmp -D_FILE_OFFSET_BITS=64 -I/usr/include/apr-1.0 binarytrees.icc-3.c -o binarytrees.icc-3.icc_run -lapr-1 -lgomp -lm
rm binarytrees.icc-3.c
5.71s to complete and log all make actions
COMMAND LINE:
./binarytrees.icc-3.icc_run 21
PROGRAM OUTPUT:
stretch tree of depth 22 check: 8388607
2097152 trees of depth 4 check: 65011712
524288 trees of depth 6 check: 66584576
131072 trees of depth 8 check: 66977792
32768 trees of depth 10 check: 67076096
8192 trees of depth 12 check: 67100672
2048 trees of depth 14 check: 67106816
512 trees of depth 16 check: 67108352
128 trees of depth 18 check: 67108736
32 trees of depth 20 check: 67108832
long lived tree of depth 21 check: 4194303