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reftable/merged: remove unnecessary null check for subiters

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Whenever we advance a subiter we first call `iterator_is_null()`. This
is not needed though because we only ever advance subiters which have
entries in the priority queue, and we do not end entries to the priority
queue when the subiter has been exhausted.

Drop the check as well as the now-unused function. This results in a
surprisingly big speedup:

    Benchmark 1: show-ref: single matching ref (revision = HEAD~)
      Time (mean ± σ):     138.1 ms ±   4.4 ms    [User: 135.1 ms, System: 2.8 ms]
      Range (min … max):   133.4 ms … 167.3 ms    1000 runs

    Benchmark 2: show-ref: single matching ref (revision = HEAD)
      Time (mean ± σ):     134.4 ms ±   4.2 ms    [User: 131.5 ms, System: 2.8 ms]
      Range (min … max):   130.0 ms … 164.0 ms    1000 runs

    Summary
      show-ref: single matching ref (revision = HEAD) ran
        1.03 ± 0.05 times faster than show-ref: single matching ref (revision = HEAD~)

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2024-03-04 11:49:03 +01:00 committed by Junio C Hamano
parent bb2d6be4c1
commit 2d71a1d4a2
3 changed files with 1 additions and 18 deletions
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5
reftable/iter.c
View File

@ -16,11 +16,6 @@ https://developers.google.com/open-source/licenses/bsd
#include "reader.h"
#include "reftable-error.h"
int iterator_is_null(struct reftable_iterator *it)
{
return !it->ops;
}
static void filtering_ref_iterator_close(void *iter_arg)
{
struct filtering_ref_iterator *fri = iter_arg;

4
reftable/iter.h
View File

@ -16,10 +16,6 @@ https://developers.google.com/open-source/licenses/bsd
#include "reftable-iterator.h"
#include "reftable-generic.h"
/* Returns true for a zeroed out iterator, such as the one returned from
* iterator_destroy. */
int iterator_is_null(struct reftable_iterator *it);
/* iterator that produces only ref records that point to `oid` */
struct filtering_ref_iterator {
int double_check;

10
reftable/merged.c
View File

@ -70,8 +70,7 @@ static void merged_iter_close(void *p)
reftable_free(mi->subiters);
}
static int merged_iter_advance_nonnull_subiter(struct merged_iter *mi,
size_t idx)
static int merged_iter_advance_subiter(struct merged_iter *mi, size_t idx)
{
struct pq_entry e = {
.index = idx,
@ -92,13 +91,6 @@ static int merged_iter_advance_nonnull_subiter(struct merged_iter *mi,
return 0;
}
static int merged_iter_advance_subiter(struct merged_iter *mi, size_t idx)
{
if (iterator_is_null(&mi->subiters[idx].iter))
return 0;
return merged_iter_advance_nonnull_subiter(mi, idx);
}
static int merged_iter_next_entry(struct merged_iter *mi,
struct reftable_record *rec)
{