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Use table lookup for run_quantize_{floor,ceil}().

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Reduce run quantization overhead by generating lookup tables during
bootstrapping, and using the tables for all subsequent run quantization.
This commit is contained in:
Jason Evans
2016-02-22 16:20:56 -08:00
parent 08551eee58
commit 0da8ce1e96
4 changed files with 90 additions and 32 deletions
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12
test/unit/run_quantize.c
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@@ -93,19 +93,14 @@ TEST_END
TEST_BEGIN(test_monotonic)
{
bool cache_oblivious;
unsigned nbins, nlruns, i;
size_t sz, max_run_size, floor_prev, ceil_prev;
size_t sz, floor_prev, ceil_prev;
/*
* Iterate over all run sizes and verify that
* run_quantize_{floor,ceil}() are monotonic.
*/
sz = sizeof(bool);
assert_d_eq(mallctl("config.cache_oblivious", &cache_oblivious, &sz,
NULL, 0), 0, "Unexpected mallctl failure");
sz = sizeof(unsigned);
assert_d_eq(mallctl("arenas.nbins", &nbins, &sz, NULL, 0), 0,
"Unexpected mallctl failure");
@@ -114,12 +109,9 @@ TEST_BEGIN(test_monotonic)
assert_d_eq(mallctl("arenas.nlruns", &nlruns, &sz, NULL, 0), 0,
"Unexpected mallctl failure");
max_run_size = (large_maxclass > small_maxrun) ? large_maxclass :
small_maxrun;
floor_prev = 0;
ceil_prev = 0;
for (i = 1; i < max_run_size >> LG_PAGE; i++) {
for (i = 1; i < run_quantize_max >> LG_PAGE; i++) {
size_t run_size, floor, ceil;
run_size = i << LG_PAGE;