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authorJohn Cai <johncai86@gmail.com>2022-03-15 02:40:36 (GMT)
committerJunio C Hamano <gitster@pobox.com>2022-03-15 17:15:32 (GMT)
commiteb54a3391bb3bdd6806ebffc21281eae8d9c0dca (patch)
tree84fe0c8ec07b5842f866f840f64080b3aa7a8106
parentc2162907e9aa884bdb70208389cb99b181620d51 (diff)
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cat-file: skip expanding default format
When format is passed into --batch, --batch-check, --batch-command, the format gets expanded. When nothing is passed in, the default format is set and the expand_format() gets called. We can save on these cycles by hardcoding how to print the information when nothing is passed as the format, or when the default format is passed. There is no need for the fully expanded format with the default. Since batch_object_write() happens on every object provided in batch mode, we get a nice performance improvement. git rev-list --all > /tmp/all-obj.txt git cat-file --batch-check </tmp/all-obj.txt with HEAD^: Time (mean ± σ): 57.6 ms ± 1.7 ms [User: 51.5 ms, System: 6.2 ms] Range (min … max): 54.6 ms … 64.7 ms 50 runs with HEAD: Time (mean ± σ): 49.8 ms ± 1.7 ms [User: 42.6 ms, System: 7.3 ms] Range (min … max): 46.9 ms … 55.9 ms 56 runs If nothing is provided as a format argument, or if the default format is passed, skip expanding of the format and print the object info with a default format. See https://lore.kernel.org/git/87eecf8ork.fsf@evledraar.gmail.com/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: John Cai <johncai86@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--builtin/cat-file.c29
-rwxr-xr-xt/perf/p1006-cat-file.sh12
2 files changed, 35 insertions, 6 deletions
diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 7b3f429..650920e 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -351,6 +351,13 @@ static void print_object_or_die(struct batch_options *opt, struct expand_data *d
}
}
+static void print_default_format(struct strbuf *scratch, struct expand_data *data)
+{
+ strbuf_addf(scratch, "%s %s %"PRIuMAX"\n", oid_to_hex(&data->oid),
+ type_name(data->type),
+ (uintmax_t)data->size);
+}
+
/*
* If "pack" is non-NULL, then "offset" is the byte offset within the pack from
* which the object may be accessed (though note that we may also rely on
@@ -382,8 +389,14 @@ static void batch_object_write(const char *obj_name,
}
strbuf_reset(scratch);
- strbuf_expand(scratch, opt->format, expand_format, data);
- strbuf_addch(scratch, '\n');
+
+ if (!opt->format) {
+ print_default_format(scratch, data);
+ } else {
+ strbuf_expand(scratch, opt->format, expand_format, data);
+ strbuf_addch(scratch, '\n');
+ }
+
batch_write(opt, scratch->buf, scratch->len);
if (opt->print_contents) {
@@ -508,6 +521,8 @@ static int batch_unordered_packed(const struct object_id *oid,
data);
}
+#define DEFAULT_FORMAT "%(objectname) %(objecttype) %(objectsize)"
+
static int batch_objects(struct batch_options *opt)
{
struct strbuf input = STRBUF_INIT;
@@ -516,9 +531,6 @@ static int batch_objects(struct batch_options *opt)
int save_warning;
int retval = 0;
- if (!opt->format)
- opt->format = "%(objectname) %(objecttype) %(objectsize)";
-
/*
* Expand once with our special mark_query flag, which will prime the
* object_info to be handed to oid_object_info_extended for each
@@ -526,12 +538,17 @@ static int batch_objects(struct batch_options *opt)
*/
memset(&data, 0, sizeof(data));
data.mark_query = 1;
- strbuf_expand(&output, opt->format, expand_format, &data);
+ strbuf_expand(&output,
+ opt->format ? opt->format : DEFAULT_FORMAT,
+ expand_format,
+ &data);
data.mark_query = 0;
strbuf_release(&output);
if (opt->cmdmode)
data.split_on_whitespace = 1;
+ if (opt->format && !strcmp(opt->format, DEFAULT_FORMAT))
+ opt->format = NULL;
/*
* If we are printing out the object, then always fill in the type,
* since we will want to decide whether or not to stream.
diff --git a/t/perf/p1006-cat-file.sh b/t/perf/p1006-cat-file.sh
new file mode 100755
index 0000000..dcd8015
--- /dev/null
+++ b/t/perf/p1006-cat-file.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+test_description='Tests listing object info performance'
+. ./perf-lib.sh
+
+test_perf_large_repo
+
+test_perf 'cat-file --batch-check' '
+ git cat-file --batch-all-objects --batch-check
+'
+
+test_done