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C: Columns: optimizing column file growth

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Celine Mercier
2020-04-18 13:55:47 +02:00
parent da8de52ba4
commit 0f745e0113
3 changed files with 6 additions and 2 deletions
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4
src/obidmscolumn.c
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@ -1974,6 +1974,10 @@ int obi_enlarge_column(OBIDMS_column_p column)
// Calculate the new file size
old_line_count = (column->header)->line_count;
new_line_count = ceil((double) old_line_count * (double) COLUMN_GROWTH_FACTOR);
if (new_line_count > old_line_count+100000)
new_line_count = old_line_count+100000;
else if (new_line_count < old_line_count+1000)
new_line_count = old_line_count+1000;
if (new_line_count > MAXIMUM_LINE_COUNT)
{

2
src/obidmscolumn.h
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@ -34,7 +34,7 @@
#define NB_ELTS_MAX_IF_DEFAULT_NAME (1000000) /**< The maximum number of elements per line if the default element names
* are used ("0\01\02\0...\0n"), considering ELEMENTS_NAMES_MAX. // TODO not up to date
*/
#define COLUMN_GROWTH_FACTOR (1.3) /**< The growth factor when a column is enlarged.
#define COLUMN_GROWTH_FACTOR (2) /**< The growth factor when a column is enlarged.
*/
#define MAXIMUM_LINE_COUNT (1000000000) /**< The maximum line count for the data of a column (1E9). //TODO
*/