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mdbx-chk: count and report %-filling histogram of tree(s).

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Леонид Юрьев (Leonid Yuriev)
2025-07-29 14:50:47 +03:00
parent 0cc52a3cc3
commit 933565b1b2
2 changed files with 20 additions and 0 deletions
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4
mdbx.h
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@@ -6552,6 +6552,10 @@ typedef struct MDBX_chk_table {
struct MDBX_chk_histogram val_len;
/// Number of multi-values (aka duplicates) histogram
struct MDBX_chk_histogram multival;
/// Histogram of branch and leaf pages filling in percents
struct MDBX_chk_histogram tree_filling;
/// Histogram of nested tree(s) branch and leaf pages filling in percents
struct MDBX_chk_histogram nested_tree_filling;
} histogram;
} MDBX_chk_table_t;

16
src/chk.c
View File

@@ -722,6 +722,7 @@ __cold static int chk_pgvisitor(const size_t pgno, const unsigned npages, void *
const char *pagetype_caption;
bool branch = false;
struct MDBX_chk_histogram *filling = nullptr;
switch (pagetype) {
default:
chk_object_issue(scope, "page", pgno, "unknown page-type", "type %u, deep %i, parent %zu", (unsigned)pagetype, deep,
@@ -751,9 +752,11 @@ __cold static int chk_pgvisitor(const size_t pgno, const unsigned npages, void *
if (!nested) {
pagetype_caption = "branch";
tbl->pages.branch += 1;
filling = &tbl->histogram.tree_filling;
} else {
pagetype_caption = "nested-branch";
tbl->pages.nested_branch += 1;
filling = &tbl->histogram.nested_tree_filling;
}
break;
case page_dupfix_leaf:
@@ -766,12 +769,14 @@ __cold static int chk_pgvisitor(const size_t pgno, const unsigned npages, void *
if (!nested) {
pagetype_caption = "leaf";
tbl->pages.leaf += 1;
filling = &tbl->histogram.tree_filling;
if (height != tbl_info->internal->height)
chk_object_issue(scope, "page", pgno, "wrong tree height", "actual %i != %i table %s, parent %zu", height,
tbl_info->internal->height, chk_v2a(chk, &tbl->name), parent_pgno);
} else {
pagetype_caption = (pagetype == page_leaf) ? "nested-leaf" : "nested-leaf-dupfix";
tbl->pages.nested_leaf += 1;
filling = &tbl->histogram.nested_tree_filling;
if (chk->last_nested != nested) {
histogram_acc(height, &tbl->histogram.nested_tree);
chk->last_nested = nested;
@@ -788,9 +793,14 @@ __cold static int chk_pgvisitor(const size_t pgno, const unsigned npages, void *
if ((tbl->flags & MDBX_DUPSORT) == 0 || nested)
chk_object_issue(scope, "page", pgno, "unexpected", "type %u, table %s flags 0x%x, deep %i, parent %zu",
(unsigned)pagetype, chk_v2a(chk, &tbl->name), tbl->flags, deep, parent_pgno);
else
filling = &tbl->histogram.nested_tree_filling;
break;
}
if (filling)
histogram_acc((page_size - unused_bytes) * 100 / page_size, filling);
if (npages) {
if (tbl->cookie) {
MDBX_chk_line_t *line = chk_line_begin(scope, MDBX_chk_extra);
@@ -965,6 +975,12 @@ __cold static int chk_tree(MDBX_chk_scope_t *const scope) {
line = chk_print(line, ", %" PRIuSIZE " empty pages", tbl->pages.empty);
if (tbl->lost_bytes)
line = chk_print(line, ", %" PRIuSIZE " bytes lost", tbl->lost_bytes);
line =
histogram_dist(chk_line_feed(line), &tbl->histogram.tree_filling, "tree %-filling density", "1", false);
if (tbl->histogram.nested_tree_filling.count)
line = histogram_dist(chk_line_feed(line), &tbl->histogram.nested_tree_filling,
"nested tree(s) %-filling density", "1", false);
chk_line_end(line);
}
}