emacs/mps/code/locbwcss.c

/* impl.c.locbwcss: LOCUS BACKWARDS COMPATIBILITY STRESS TEST
 *
 * $Id: locbwcss.c,v 1.4 2002/05/10 11:11:39 pekka Exp $
 * $HopeName: MMsrc!locbwcss.c(trunk.4) $
 * Copyright (c) 2001 Ravenbrook Limited.
 */

#include "mpscmvff.h"
#include "mpslib.h"
#include "mpsavm.h"
#include "testlib.h"
#include "mps.h"

#include <stdlib.h>
#include <stdarg.h>


/* some constants */

#define TRUE  1
#define FALSE 0

#define iterationCount 30          /* number of iterations */
#define allocsPerIteration 8       /* number of allocs each iteration */
#define chunkSize ((size_t)65536)  /* our allocation chunk size */

#define testArenaSIZE \
  ((size_t)(chunkSize * iterationCount * allocsPerIteration * 3))


#define AddressOffset(b, l) \
  ((size_t)((char *)(l) - (char *)(b)))


/* PoolStat -- maintain data about contiguous allocations */ 

typedef struct PoolStatStruct *PoolStat;

typedef struct PoolStatStruct {
  mps_pool_t pool;  /* the pool being measured */
  size_t objSize;   /* size of each allocation */
  mps_addr_t min;   /* lowest address lock allocated to the pool */
  mps_addr_t max;   /* highest address lock allocated to the pool */
  int ncCount;      /* count of non-contiguous allocations */
  int aCount;       /* count of allocations */
  int fCount;       /* count of frees */
} PoolStatStruct;



static mps_addr_t allocObject(mps_pool_t pool, size_t size)
{
  mps_addr_t addr;
  die(mps_alloc(&addr, pool, size),
      "Allocate Object");
  return addr;
}


static void recordNewObjectStat(PoolStat stat, mps_addr_t obj)
{
  stat->aCount++;
  if (obj < stat->min) {
    if (AddressOffset(obj, stat->min) > stat->objSize) {
      stat->ncCount++;
    }
    stat->min = obj;
  } else if (obj > stat->max) {
    if (AddressOffset(stat->max, obj) > stat->objSize) {
      stat->ncCount++;
    }
    stat->max = obj;
  }
}

static void recordFreedObjectStat(PoolStat stat)
{
  stat->fCount++;
}


static void poolStatInit(PoolStat stat, mps_pool_t pool, size_t objSize)
{
  mps_addr_t s1, s2, s3;

  stat->pool = pool;
  stat->objSize = objSize;
  stat->ncCount = 0;
  stat->aCount = 0;
  stat->fCount = 0;

  /* allocate 3 half-size sentinel objects, freeing the middle one */
  /* to leave a bit of space for the control pool */
  s1 = allocObject(pool, objSize / 2);
  stat->min = s1;
  stat->max = s1;
  stat->aCount++;

  s2 = allocObject(pool, objSize / 2);
  recordNewObjectStat(stat, s2);
  s3 = allocObject(pool, objSize / 2);
  recordNewObjectStat(stat, s3);

  mps_free(pool, s2, objSize / 2);  
  recordFreedObjectStat(stat);

}


static void allocMultiple(PoolStat stat)
{
  mps_addr_t objects[allocsPerIteration];
  int i;

  /* allocate a few objects, and record stats for them */
  for (i = 0; i < allocsPerIteration; i++) {
    mps_addr_t obj = allocObject(stat->pool, stat->objSize);
    recordNewObjectStat(stat, obj);
    objects[i] = obj;
  }

  /* free one of the objects, to make the test more interesting */
  i = rnd() % allocsPerIteration;
  mps_free(stat->pool, objects[i], stat->objSize);  
  recordFreedObjectStat(stat);

}


/* reportResults - print a report on a PoolStat */

static void reportResults(PoolStat stat, char *name)
{
  printf("\nResults for ");
  printf(name);
  printf("\n");
  printf("   Allocated  %lu objects\n", (unsigned long)stat->aCount);
  printf("   Freed      %lu objects\n", (unsigned long)stat->fCount);
  printf("   There were %lu non-contiguous allocations\n", 
         (unsigned long)stat->ncCount);
  printf("   Address range from %p to %p\n",
         (void *)stat->min, (void *)stat->max);
  printf("\n");
}


static void testInArena(mps_arena_t arena)
{
  mps_pool_t lopool, hipool;
  PoolStatStruct lostruct;  /* stats about lopool */
  PoolStatStruct histruct;  /* stats about lopool */
  PoolStat lostat = &lostruct;
  PoolStat histat = &histruct;
  int i;

  die(mps_pool_create(&hipool, arena, mps_class_mvff(), 
                      chunkSize, chunkSize, 1024, 
                      TRUE, TRUE, TRUE),
      "Create HI MFFV");

  die(mps_pool_create(&lopool, arena, mps_class_mvff(), 
                      chunkSize, chunkSize, 1024, 
                      FALSE, FALSE, TRUE),
      "Create LO MFFV");

  poolStatInit(lostat, lopool, chunkSize);
  poolStatInit(histat, hipool, chunkSize);

  /* iterate, allocating objects */
  for (i=0; i<iterationCount; ++i) {
    allocMultiple(lostat);
    allocMultiple(histat);
  }

  /* report results */
  reportResults(lostat, "the low MVFF pool");
  reportResults(histat, "the high MVFF pool");
  
  if (lostat->max > histat->min) {
    printf("\nFOUND PROBLEM - low range overlaps high\n");
  } else if (lostat->ncCount != 0 || histat->ncCount != 0) {
    printf("\nFOUND POSSIBLE PROBLEM - some non-contiguous allocations\n");
  } else {
    printf("\nNo problems detected.\n");
  }

  mps_pool_destroy(hipool);
  mps_pool_destroy(lopool);
}


int main(int argc, char **argv)
{
  mps_arena_t arena;

  randomize(argc, argv);

  die(mps_arena_create(&arena, mps_arena_class_vmnz(), testArenaSIZE),
      "mps_arena_create");

  testInArena(arena);

  mps_arena_destroy(arena);

  return 0;
}