From: Derrick Stolee <dstolee@microsoft.com>
To: git@vger.kernel.org
Cc: stolee@gmail.com, git@jeffhostetler.com, sbeller@google.com,
gitster@pobox.com, Derrick Stolee <dstolee@microsoft.com>
Subject: [PATCH v3 4/5] sha1_name: Parse less while finding common prefix
Date: Mon, 2 Oct 2017 10:56:50 -0400 [thread overview]
Message-ID: <20171002145651.204984-5-dstolee@microsoft.com> (raw)
In-Reply-To: <20170925095452.66833-1-dstolee@microsoft.com>
Create get_hex_char_from_oid() to parse oids one hex character at a
time. This prevents unnecessary copying of hex characters in
extend_abbrev_len() when finding the length of a common prefix.
p0008.1: find_unique_abbrev() for existing objects
--------------------------------------------------
For 10 repeated tests, each checking 100,000 known objects, we find the
following results when running in a Linux VM:
| | Pack | Packed | Loose | Base | New | |
| Repo | Files | Objects | Objects| Time | Time | Rel% |
|-------|-------|---------|--------|--------|--------|--------|
| Git | 1 | 230078 | 0 | 0.06 s | 0.05 s | -16.7% |
| Git | 5 | 230162 | 0 | 0.08 s | 0.08 s | 0.0% |
| Git | 4 | 154310 | 75852 | 0.07 s | 0.06 s | -14.3% |
| Linux | 1 | 5606645 | 0 | 0.32 s | 0.14 s | -56.3% |
| Linux | 24 | 5606645 | 0 | 1.12 s | 0.94 s | -16.1% |
| Linux | 23 | 5283204 | 323441 | 1.05 s | 0.86 s | -18.1% |
| VSTS | 1 | 4355923 | 0 | 0.23 s | 0.11 s | -52.2% |
| VSTS | 32 | 4355923 | 0 | 1.08 s | 0.95 s | -12.0% |
| VSTS | 31 | 4276829 | 79094 | 2.08 s | 1.82 s | -12.5% |
For the Windows repo running in Windows Subsystem for Linux:
Pack Files: 50
Packed Objects: 22,385,898
Loose Objects: 492
Base Time: 4.61 s
New Time: 4.61 s
Rel %: 0.0%
p0008.2: find_unique_abbrev() for missing objects
-------------------------------------------------
For 10 repeated tests, each checking 100,000 missing objects, we find
the following results when running in a Linux VM:
| | Pack | Packed | Loose | Base | New | |
| Repo | Files | Objects | Objects| Time | Time | Rel% |
|-------|-------|---------|--------|--------|--------|--------|
| Git | 1 | 230078 | 0 | 0.08 s | 0.07 s | -12.5% |
| Git | 5 | 230162 | 0 | 0.13 s | 0.12 s | - 7.7% |
| Git | 4 | 154310 | 75852 | 0.10 s | 0.09 s | -10.0% |
| Linux | 1 | 5606645 | 0 | 0.32 s | 0.13 s | -59.4% |
| Linux | 24 | 5606645 | 0 | 1.09 s | 0.89 s | -18.3% |
| Linux | 23 | 5283204 | 323441 | 0.99 s | 0.83 s | -16.2% |
| VSTS | 1 | 4355923 | 0 | 0.25 s | 0.11 s | -56.0% |
| VSTS | 32 | 4355923 | 0 | 1.15 s | 0.99 s | -13.9% |
| VSTS | 31 | 4276829 | 79094 | 1.18 s | 1.02 s | -13.6% |
For the Windows repo running in Windows Subsystem for Linux:
Pack Files: 50
Packed Objects: 22,385,898
Loose Objects: 492
Base Time: 3.91 s
New Time: 3.08 s
Rel %: -21.1%
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
sha1_name.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/sha1_name.c b/sha1_name.c
index f2a1ebe49..5081aeb71 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -480,13 +480,23 @@ struct min_abbrev_data {
char *hex;
};
+static inline char get_hex_char_from_oid(const struct object_id *oid,
+ int pos)
+{
+ static const char hex[] = "0123456789abcdef";
+
+ if ((pos & 1) == 0)
+ return hex[oid->hash[pos >> 1] >> 4];
+ else
+ return hex[oid->hash[pos >> 1] & 0xf];
+}
+
static int extend_abbrev_len(const struct object_id *oid, void *cb_data)
{
struct min_abbrev_data *mad = cb_data;
- char *hex = oid_to_hex(oid);
unsigned int i = mad->init_len;
- while (mad->hex[i] && mad->hex[i] == hex[i])
+ while (mad->hex[i] && mad->hex[i] == get_hex_char_from_oid(oid, i))
i++;
if (i < GIT_MAX_RAWSZ && i >= mad->cur_len)
--
2.14.1.538.g56ec8fc98.dirty
next prev parent reply other threads:[~2017-10-02 14:57 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-25 9:54 [PATCH v2 0/5] Improve abbreviation disambiguation Derrick Stolee
2017-09-25 9:54 ` [PATCH v2 1/5] test-list-objects: List a subset of object ids Derrick Stolee
2017-09-26 9:24 ` Junio C Hamano
2017-10-05 8:42 ` Jeff King
2017-10-05 9:48 ` Junio C Hamano
2017-10-05 10:00 ` Jeff King
2017-10-05 10:16 ` Junio C Hamano
2017-10-05 12:39 ` Derrick Stolee
2017-10-06 14:11 ` Jeff King
2017-10-07 19:12 ` Derrick Stolee
2017-10-07 19:33 ` Jeff King
2017-10-08 1:46 ` Junio C Hamano
2017-09-25 9:54 ` [PATCH v2 2/5] p0008-abbrev.sh: Test find_unique_abbrev() perf Derrick Stolee
2017-09-26 9:27 ` Junio C Hamano
2017-10-05 8:55 ` Jeff King
2017-10-05 8:57 ` Jeff King
2017-09-25 9:54 ` [PATCH v2 3/5] sha1_name: Unroll len loop in find_unique_abbrev_r Derrick Stolee
2017-09-25 9:54 ` [PATCH v2 4/5] sha1_name: Parse less while finding common prefix Derrick Stolee
2017-09-25 23:42 ` Stefan Beller
2017-10-02 14:52 ` Derrick Stolee
2017-09-25 9:54 ` [PATCH v2 5/5] sha1_name: Minimize OID comparisons during disambiguation Derrick Stolee
2017-10-02 14:56 ` [PATCH v3 0/5] Improve abbreviation disambituation Derrick Stolee
2017-10-05 9:49 ` Jeff King
2017-10-02 14:56 ` [PATCH v3 1/5] test-list-objects: List a subset of object ids Derrick Stolee
2017-10-03 4:16 ` Junio C Hamano
2017-10-02 14:56 ` [PATCH v3 2/5] p0008-abbrev.sh: Test find_unique_abbrev() perf Derrick Stolee
2017-10-02 14:56 ` [PATCH v3 3/5] sha1_name: Unroll len loop in find_unique_abbrev_r Derrick Stolee
2017-10-03 10:49 ` Junio C Hamano
2017-10-03 11:26 ` Derrick Stolee
2017-10-04 6:10 ` Junio C Hamano
2017-10-04 13:06 ` Derrick Stolee
2017-10-04 6:07 ` Junio C Hamano
2017-10-04 13:19 ` Derrick Stolee
2017-10-05 1:26 ` Junio C Hamano
2017-10-05 9:13 ` Jeff King
2017-10-05 9:50 ` Junio C Hamano
2017-10-02 14:56 ` Derrick Stolee [this message]
2017-10-04 6:14 ` [PATCH v3 4/5] sha1_name: Parse less while finding common prefix Junio C Hamano
2017-10-02 14:56 ` [PATCH v3 5/5] sha1_name: Minimize OID comparisons during disambiguation Derrick Stolee
2017-10-03 15:55 ` Stefan Beller
2017-10-03 17:05 ` Derrick Stolee
2017-10-05 9:44 ` Jeff King
2017-10-06 13:52 ` [PATCH] cleanup: fix possible overflow errors in binary search Derrick Stolee
2017-10-06 14:18 ` Jeff King
2017-10-06 14:41 ` Derrick Stolee
2017-10-08 18:29 ` [PATCH v2] " Derrick Stolee
2017-10-09 13:33 ` Jeff King
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