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patch 8.1.1752: resizing hashtable is inefficient

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Problem:    Resizing hashtable is inefficient.
Solution:   Avoid resizing when the final size is predictable.
This commit is contained in:
Bram Moolenaar
2019-07-26 21:26:34 +02:00
parent 9d5ffceb3f
commit 7b73d7ebf7
4 changed files with 10 additions and 5 deletions
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8
src/hashtab.c
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@@ -286,7 +286,6 @@ hash_lock(hashtab_T *ht)
++ht->ht_locked;
}
#if 0 /* currently not used */
/*
* Lock a hashtable at the specified number of entries.
* Caller must make sure no more than "size" entries will be added.
@@ -298,7 +297,6 @@ hash_lock_size(hashtab_T *ht, int size)
(void)hash_may_resize(ht, size);
++ht->ht_locked;
}
#endif
/*
* Unlock a hashtable: allow ht_array changes again.
@@ -368,10 +366,10 @@ hash_may_resize(
}
else
{
/* Use specified size. */
if ((long_u)minitems < ht->ht_used) /* just in case... */
// Use specified size.
if ((long_u)minitems < ht->ht_used) // just in case...
minitems = (int)ht->ht_used;
minsize = minitems * 3 / 2; /* array is up to 2/3 full */
minsize = (minitems * 3 + 1) / 2; // array is up to 2/3 full
}
newsize = HT_INIT_SIZE;

4
src/popupwin.c
View File

@@ -2032,7 +2032,9 @@ f_popup_getpos(typval_T *argvars, typval_T *rettv)
top_extra = popup_top_extra(wp);
left_extra = wp->w_popup_border[3] + wp->w_popup_padding[3];
// we know how much space we need, avoid resizing halfway
dict = rettv->vval.v_dict;
hash_lock_size(&dict->dv_hashtab, 11);
dict_add_number(dict, "line", wp->w_winrow + 1);
dict_add_number(dict, "col", wp->w_wincol + 1);
@@ -2050,6 +2052,8 @@ f_popup_getpos(typval_T *argvars, typval_T *rettv)
dict_add_number(dict, "firstline", wp->w_topline);
dict_add_number(dict, "visible",
win_valid(wp) && (wp->w_popup_flags & POPF_HIDDEN) == 0);
hash_unlock(&dict->dv_hashtab);
}
}
/*

1
src/proto/hashtab.pro
View File

@@ -9,6 +9,7 @@ int hash_add(hashtab_T *ht, char_u *key);
int hash_add_item(hashtab_T *ht, hashitem_T *hi, char_u *key, hash_T hash);
void hash_remove(hashtab_T *ht, hashitem_T *hi);
void hash_lock(hashtab_T *ht);
void hash_lock_size(hashtab_T *ht, int size);
void hash_unlock(hashtab_T *ht);
hash_T hash_hash(char_u *key);
/* vim: set ft=c : */

2
src/version.c
View File

@@ -777,6 +777,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
1752,
/**/
1751,
/**/