mirror/hdf5
2
0
Fork 0
mirror of https://github.com/HDFGroup/hdf5.git synced 2025-03-19 16:50:46 +08:00
Code Issues Packages Projects Releases Wiki Activity

[svn-r10508]

Browse Source 
Purpose:
Bug fix

Description:
test/big fails randomly with a message warning of 'possible overlap.'

Solution:
Have the random number generator check each value to make sure a write at
that position doesn't overlap any previous write.

Platforms tested:
sleipnir, modi4, eirene
This commit is contained in:
James Laird 2005-03-29 17:14:47 -05:00
parent 7f98ee5db8
commit 680fa675fb
1 changed files with 36 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
test/big.c
View File

@ -29,6 +29,8 @@ const char *FILENAME[] = {
#define WRT_SIZE 4*1024
#define FAMILY_SIZE 1024*1024*1024
#define MAX_TRIES 100
#if H5_SIZEOF_LONG_LONG >= 8
# define GB8LL ((unsigned long_long)8*1024*1024*1024)
#else
@ -38,15 +40,20 @@ const char *FILENAME[] = {
/* Protocols */
static void usage(void);
/* Array used to record all addresses at which data has been written */
/* so far. Used to prevent overlapping writes. */
static hsize_t values_used[WRT_N];
/*-------------------------------------------------------------------------
* Function: randll
*
* Purpose: Create a random long_long value.
* Ensures that a write at this value doesn't overlap any
* previous write.
*
* Return: Success: Random value
*
* Failure: never fails
* Failure: Random value which overlaps another write
*
* Programmer: Robb Matzke
* Tuesday, November 24, 1998
@ -56,13 +63,35 @@ static void usage(void);
*-------------------------------------------------------------------------
*/
static hsize_t
randll(hsize_t limit)
randll(hsize_t limit, int current_index)
{
hsize_t acc = rand ();
acc *= rand ();
hsize_t acc;
int overlap = 1;
int i;
int tries = 0;
return acc % limit;
/* Generate up to MAX_TRIES random numbers until one of them */
/* does not overlap with any previous writes */
while(overlap != 0 && tries < MAX_TRIES)
{
acc = rand ();
acc *= rand ();
acc = acc % limit;
overlap = 0;
for(i = 0; i < current_index; i++)
{
if((acc >= values_used[i]) && (acc < values_used[i]+WRT_SIZE))
overlap = 1;
if((acc+WRT_SIZE >= values_used[i]) && (acc+WRT_SIZE < values_used[i]+WRT_SIZE))
overlap = 1;
}
tries++;
}
values_used[current_index]=acc;
return acc;
}
@ -240,7 +269,7 @@ writer (hid_t fapl, int wrt_n)
hs_size[0] = WRT_SIZE;
if ((mem_space = H5Screate_simple (1, hs_size, hs_size))<0) goto error;
for (i=0; i<wrt_n; i++) {
hs_start[0] = randll (size2[0]);
hs_start[0] = randll (size2[0], i);
HDfprintf (out, "#%03d 0x%016Hx\n", i, hs_start[0]);
if (H5Sselect_hyperslab (space2, H5S_SELECT_SET, hs_start, NULL,
hs_size, NULL)<0) goto error;