x64 Ubuntu : Intel® Q6600® quad-core
Computer Language Benchmarks Game      [[ Play ]]

- all benchmarks - n-body fannkuch-redux meteor-contest fasta fasta-redux spectral-norm reverse-complement mandelbrot k-nucleotide regex-dna pidigits chameneos-redux thread-ring binary-trees-redux binary-trees - all languages - Ada 2005 GNAT ATS C gcc Clojure C# Mono C++ g++ Dart Erlang Erlang HiPE F# Mono Fortran Intel Go Haskell GHC Java 7 Lisp SBCL OCaml Pascal Free Pascal Perl PHP Python 3 Racket Ruby 2.0 Ruby JRuby Scala x86 one core x64 quad-core x86 quad-core x64 one core

 performance measurements

Each table row shows performance measurements for this C gcc program with a particular command-line input value N.

N	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
500,000	3.02	2.21	4,620	487	55% 1% 1% 57%
5,000,000	29.80	22.05	4,620	487	46% 8% 8% 46%
50,000,000	298.26	222.99	4,620	487	42% 10% 10% 42%

Read the ↓ make, command line, and program output logs to see how this program was run.

Read thread-ring benchmark to see what this program should do.

 notes

gcc (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3

 thread-ring C gcc program source code

/* The Computer Language Benchmarks Game
 * http://benchmarksgame.alioth.debian.org/

* contributed by Premysl Hruby
*/

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <limits.h>

#define THREADS (503)


struct stack {
   char x[PTHREAD_STACK_MIN];
};


/* staticaly initialize mutex[0] mutex */
static pthread_mutex_t mutex[THREADS]; 
static int data[THREADS];
static struct stack stacks[THREADS];
/* stacks must be defined staticaly, or my i386 box run of virtual memory for this
 * process while creating thread +- #400 */

static void* thread(void *num)
{
   int l = (int)num;
   int r = (l+1) % THREADS;
   int token;

   while(1) {
      pthread_mutex_lock(mutex + l);
      token = data[l];
      if (token) {
         data[r] = token - 1;
         pthread_mutex_unlock(mutex + r);
      }
      else {
         printf("%i\n", l+1);
         exit(0);
      }
   }
}



int main(int argc, char **argv)
{
   int i;
   pthread_t cthread;
   pthread_attr_t stack_attr;

   if (argc != 2)
      exit(255);
   data[0] = atoi(argv[1]);

   pthread_attr_init(&stack_attr);
      
   for (i = 0; i < THREADS; i++) {
      pthread_mutex_init(mutex + i, NULL);
      pthread_mutex_lock(mutex + i);

      pthread_attr_setstack(&stack_attr, &stacks[i], sizeof(struct stack)); 
      pthread_create(&cthread, &stack_attr, thread, (void*)i);
   }

   pthread_mutex_unlock(mutex + 0);
   pthread_join(cthread, NULL);   
}

 make, command-line, and program output logs

Sun, 28 Apr 2013 01:39:51 GMT

MAKE:
/usr/bin/gcc -pipe -Wall -O3 -fomit-frame-pointer -march=native -pthread threadring.c -o threadring.gcc_run 
threadring.c: In function ‘thread’:
threadring.c:30:12: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
threadring.c: In function ‘main’:
threadring.c:67:53: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
threadring.c:72:1: warning: control reaches end of non-void function [-Wreturn-type]
rm threadring.c
0.10s to complete and log all make actions

COMMAND LINE:
./threadring.gcc_run 50000000

PROGRAM OUTPUT:
292

  Home   Conclusions   License   Play