stasis-aries-wal/test/lladd/check_regions.c

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---*/
#include <config.h>
#include <lladd/common.h>
#include <../../src/lladd/latches.h>
#include <check.h>
#include <assert.h>

#include <lladd/transactional.h>
#include "../check_includes.h"
#define LOG_NAME   "check_regions.log"

long myrandom(long x) {
  double xx = x;
  double r = random();
  double max = ((long)RAND_MAX)+1;
  max /= xx;
  return (long)((r/max));
}



/**
   @test
*/
START_TEST(regions_smokeTest) {
  Tinit();
  int xid = Tbegin();

  int max_page = 0;
  int page = TregionAlloc(xid, 100, 1);
  int new_page = page;
  if(new_page + 1 + 100 > max_page) { 
    max_page = new_page + 1 + 100;
  }

  new_page = TregionAlloc(xid, 1, 1);
  if(new_page + 2 > max_page) { 
    max_page = new_page + 2;
  }
  TregionDealloc(xid, page);

  for(int i = 0; i < 50; i++) { 
    new_page = TregionAlloc(xid, 1, 1);
    if(new_page + 2 > max_page) { 
      max_page = new_page + 2;
    }
  }

  for(int i = 0; i < 50; i+=2) { 
    TregionDealloc(xid, i*2+1);
  }

  Tcommit(xid);

  xid = Tbegin();
  for(int i = 0; i < 50; i+=2) { 
    new_page = TregionAlloc(xid, 1, 1);
    if(new_page + 2 > max_page) { 
      max_page = new_page + 2;
    }
  }
  Tabort(xid);
  xid = Tbegin();
  for(int i = 0; i < 50; i+=2) { 
    new_page = TregionAlloc(xid, 1, 1);
    if(new_page + 2 > max_page) { 
      max_page = new_page + 2;
    }
  }
  Tcommit(xid);

  printf("\nMaximum space usage = %d, best possible = %d\n", max_page, 104); // peak storage usage = 100 pages + 1 page + 3 boundary pages.

  Tdeinit();
}
END_TEST

START_TEST(regions_randomizedTest) { 
  Tinit();
  time_t seed = time(0);
  printf("\nSeed = %ld\n", seed);
  srandom(seed);
  int xid = Tbegin();
  unsigned int pagesAlloced = 0;
  unsigned int regionsAlloced = 0;
  double max_blowup = 0;
  unsigned int max_region_count = 0;
  unsigned int max_waste = 0;
  unsigned int max_size = 0;
  unsigned int max_ideal_size = 0;
  for(int i = 0; i < 10000; i++) { 
    if(myrandom(2)) { 
      unsigned int size = myrandom(100);
      TregionAlloc(xid, size, 1);
      pagesAlloced += size;
      regionsAlloced ++;
    } else {
      if(regionsAlloced) { 
	unsigned int victim = myrandom(regionsAlloced);
	unsigned int victimSize;
	unsigned int victimPage;
	TregionFindNthActive(xid, victim, &victimPage, &victimSize);
	TregionDealloc(xid, victimPage);
	//	assert(victimSize >= 0 && victimSize < 100);
	pagesAlloced -= victimSize;
	regionsAlloced --;
      } else { 
	i--;
      }
    }

    if(regionsAlloced) { 
      unsigned int lastRegionStart;
      unsigned int lastRegionSize;
      
      TregionFindNthActive(xid, regionsAlloced-1, &lastRegionStart, &lastRegionSize);
      unsigned int length = lastRegionStart + lastRegionSize+1;
      unsigned int ideal  = pagesAlloced + regionsAlloced + 1;
      double blowup = (double)length/(double)ideal;
      unsigned int bytes_wasted = length - ideal;
      // printf("Region count = %d, blowup = %d / %d = %5.2f\n", regionsAlloced, length, ideal, blowup);
      if(max_blowup < blowup) { 
	max_blowup = blowup;
      }
      if(max_waste < bytes_wasted) { 
	max_waste = bytes_wasted;
      }
      if(max_size < length) { 
	max_size = length;
      }
      if(max_ideal_size < ideal) { 
	max_ideal_size = ideal;
      }
      if(max_region_count < regionsAlloced) { 
	max_region_count = regionsAlloced;
      }
    }
  }
  Tcommit(xid);
  Tdeinit();
  if((double)max_size/(double)max_ideal_size > 5) {  
    // max_blowup isn't what we want here; it measures the peak
    // percentage of the file that is unused.  Instead, we want to
    // measure the actual and ideal page file sizes for this run.
    printf("WARNING: Excessive blowup ");
  } 
  printf("Max # of regions = %d, page file size = %5.2fM, ideal page file size = %5.2fM, (blowup = %5.2f)\n",
	 //peak bytes wasted = %5.2fM, blowup = %3.2f\n", 
	 max_region_count, 
	 ((double)max_size * PAGE_SIZE)/(1024.0*1024.0), 
	 ((double)max_ideal_size * PAGE_SIZE)/(1024.0*1024.0), 
	 (double)max_size/(double)max_ideal_size);
  //	 ((double)max_waste * PAGE_SIZE)/(1024.0*1024.0), 
  //	 max_blowup);
} END_TEST

/** 
  Add suite declarations here
*/
Suite * check_suite(void) {
  Suite *s = suite_create("regions");
  /* Begin a new test */
  TCase *tc = tcase_create("regions_test");
  tcase_set_timeout(tc, 0); // disable timeouts

  /* Sub tests are added, one per line, here */  
  tcase_add_test(tc, regions_smokeTest);
  tcase_add_test(tc, regions_randomizedTest);
  /* --------------------------------------------- */
  tcase_add_checked_fixture(tc, setup, teardown);
  suite_add_tcase(s, tc);


  return s;
}

#include "../check_setup.h"