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mdbx: radix sort for large chunks of PNL and DPL.
More for https://github.com/erthink/libmdbx/issues/132 Change-Id: I19b253f78069d4ecd4ec360a12121c78f182fc09
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.github/actions/spelling/expect.txt
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.github/actions/spelling/expect.txt
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@ -1304,6 +1304,7 @@ quanah
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quicksort
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quicksort
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Quinteiro
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Quinteiro
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qwest
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qwest
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radixsort
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radvisory
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radvisory
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RAII
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RAII
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ramdev
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ramdev
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77
src/core.c
77
src/core.c
@ -2686,6 +2686,68 @@ static int lcklist_detach_locked(MDBX_env *env) {
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} \
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} \
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}
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}
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/*------------------------------------------------------------------------------
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* LY: radix sort for large chunks */
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#define RADIXSORT_IMPL(NAME, TYPE, EXTRACT_KEY) \
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\
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__hot static bool NAME##_radixsort(TYPE *const begin, \
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const unsigned length) { \
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TYPE *tmp = mdbx_malloc(sizeof(TYPE) * length); \
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if (unlikely(!tmp)) \
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return false; \
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\
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unsigned key_shift = 0, key_diff_mask; \
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do { \
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struct { \
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unsigned a[256], b[256]; \
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} counters; \
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memset(&counters, 0, sizeof(counters)); \
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\
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key_diff_mask = 0; \
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unsigned prev_key = EXTRACT_KEY(begin) >> key_shift; \
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TYPE *r = begin, *end = begin + length; \
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do { \
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const unsigned key = EXTRACT_KEY(r) >> key_shift; \
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counters.a[key & 255]++; \
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counters.b[(key >> 8) & 255]++; \
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key_diff_mask |= prev_key ^ key; \
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prev_key = key; \
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} while (++r != end); \
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\
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unsigned ta = 0, tb = 0; \
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for (unsigned i = 0; i < 256; ++i) { \
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const unsigned ia = counters.a[i]; \
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counters.a[i] = ta; \
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ta += ia; \
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const unsigned ib = counters.b[i]; \
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counters.b[i] = tb; \
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tb += ib; \
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} \
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\
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r = begin; \
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do { \
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const unsigned key = EXTRACT_KEY(r) >> key_shift; \
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tmp[counters.a[key & 255]++] = *r; \
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} while (++r != end); \
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\
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if (unlikely(key_diff_mask < 256)) { \
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memcpy(begin, tmp, (char *)end - (char *)begin); \
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break; \
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} \
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end = (r = tmp) + length; \
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do { \
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const unsigned key = EXTRACT_KEY(r) >> key_shift; \
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begin[counters.b[(key >> 8) & 255]++] = *r; \
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} while (++r != end); \
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\
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key_shift += 16; \
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} while (key_diff_mask >> 16); \
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\
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mdbx_free(tmp); \
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return true; \
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}
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/*------------------------------------------------------------------------------
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/*------------------------------------------------------------------------------
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* LY: Binary search */
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* LY: Binary search */
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@ -2995,8 +3057,17 @@ static MDBX_PNL mdbx_spill_purge(MDBX_txn *txn) {
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return sl;
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return sl;
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}
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}
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#if MDBX_PNL_ASCENDING
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#define MDBX_PNL_EXTRACT_KEY(ptr) (*(ptr))
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#else
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#define MDBX_PNL_EXTRACT_KEY(ptr) (P_INVALID - *(ptr))
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#endif
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RADIXSORT_IMPL(pgno, pgno_t, MDBX_PNL_EXTRACT_KEY)
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SORT_IMPL(pgno_sort, false, pgno_t, MDBX_PNL_ORDERED)
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SORT_IMPL(pgno_sort, false, pgno_t, MDBX_PNL_ORDERED)
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static __hot void mdbx_pnl_sort(MDBX_PNL pnl) {
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static __hot void mdbx_pnl_sort(MDBX_PNL pnl) {
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if (likely(MDBX_PNL_SIZE(pnl) < MDBX_PNL_RADIXSORT_THRESHOLD) ||
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!pgno_radixsort(&MDBX_PNL_FIRST(pnl), MDBX_PNL_SIZE(pnl)))
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pgno_sort(MDBX_PNL_BEGIN(pnl), MDBX_PNL_END(pnl));
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pgno_sort(MDBX_PNL_BEGIN(pnl), MDBX_PNL_END(pnl));
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assert(mdbx_pnl_check(pnl, MAX_PAGENO + 1));
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assert(mdbx_pnl_check(pnl, MAX_PAGENO + 1));
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}
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}
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@ -3229,11 +3300,16 @@ static int mdbx_dpl_alloc(MDBX_txn *txn) {
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return MDBX_SUCCESS;
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return MDBX_SUCCESS;
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}
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}
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#define MDBX_DPL_EXTRACT_KEY(ptr) ((ptr)->pgno)
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RADIXSORT_IMPL(dpl, MDBX_dp, MDBX_DPL_EXTRACT_KEY)
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#define DP_SORT_CMP(first, last) ((first).pgno < (last).pgno)
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#define DP_SORT_CMP(first, last) ((first).pgno < (last).pgno)
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SORT_IMPL(dp_sort, false, MDBX_dp, DP_SORT_CMP)
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SORT_IMPL(dp_sort, false, MDBX_dp, DP_SORT_CMP)
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__hot static MDBX_dpl *mdbx_dpl_sort_slowpath(MDBX_dpl *dl) {
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__hot static MDBX_dpl *mdbx_dpl_sort_slowpath(MDBX_dpl *dl) {
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const unsigned unsorted = dl->length - dl->sorted;
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const unsigned unsorted = dl->length - dl->sorted;
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if (likely(unsorted < MDBX_PNL_RADIXSORT_THRESHOLD) ||
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!dpl_radixsort(dl->items + 1, dl->length)) {
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if (dl->sorted > unsorted / 4 + 4 &&
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if (dl->sorted > unsorted / 4 + 4 &&
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dl->length + unsorted < dl->detent + MDBX_DPL_GAP_FOR_MERGESORT) {
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dl->length + unsorted < dl->detent + MDBX_DPL_GAP_FOR_MERGESORT) {
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MDBX_dp *const sorted_begin = dl->items + 1;
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MDBX_dp *const sorted_begin = dl->items + 1;
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@ -3265,6 +3341,7 @@ __hot static MDBX_dpl *mdbx_dpl_sort_slowpath(MDBX_dpl *dl) {
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assert(dl->items[0].pgno == 0 &&
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assert(dl->items[0].pgno == 0 &&
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dl->items[dl->length + 1].pgno == P_INVALID);
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dl->items[dl->length + 1].pgno == P_INVALID);
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}
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}
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}
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dl->sorted = dl->length;
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dl->sorted = dl->length;
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return dl;
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return dl;
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}
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}
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@ -680,6 +680,7 @@ typedef struct MDBX_dpl {
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/* PNL sizes */
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/* PNL sizes */
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#define MDBX_PNL_GRANULATE 1024
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#define MDBX_PNL_GRANULATE 1024
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#define MDBX_PNL_RADIXSORT_THRESHOLD 1024
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#define MDBX_PNL_INITIAL \
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#define MDBX_PNL_INITIAL \
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(MDBX_PNL_GRANULATE - 2 - MDBX_ASSUME_MALLOC_OVERHEAD / sizeof(pgno_t))
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(MDBX_PNL_GRANULATE - 2 - MDBX_ASSUME_MALLOC_OVERHEAD / sizeof(pgno_t))
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