Traditionally cat-file's batch-mode does not do any output
buffering. The reason is that a caller may have pipes
connected to its input and output, and would want to use
cat-file interactively, getting output immediately for each
input it sends.
This may involve a lot of small write() calls, which can be
slow. So we introduced --buffer to improve this, but we
can't turn it on by default, as it would break the
interactive case above.
However, when --batch-all-objects is used, we do not read
stdin at all. We generate the output ourselves as quickly as
possible, and then exit. In this case buffering is a strict
win, and it is simply a hassle for the user to have to
remember to specify --buffer.
This patch makes --buffer the default when --batch-all-objects
is used. Specifying "--buffer" manually is still OK, and you
can even override it with "--no-buffer" if you're a
masochist (or debugging).
For some real numbers, running:
git cat-file --batch-all-objects --batch-check='%(objectname)'
on torvalds/linux goes from:
real 0m1.464s
user 0m1.208s
sys 0m0.252s
to:
real 0m1.230s
user 0m1.172s
sys 0m0.056s
for a 16% speedup.
Suggested-by: Charles Bailey <char...@hashpling.org>
Signed-off-by: Jeff King <p...@peff.net>
---
builtin/cat-file.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 5d3180e..618103f 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -504,6 +504,7 @@ int cmd_cat_file(int argc, const char **argv, const char
*prefix)
git_config(git_cat_file_config, NULL);
+ batch.buffer_output = -1;
argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
if (opt) {
@@ -527,6 +528,9 @@ int cmd_cat_file(int argc, const char **argv, const char
*prefix)
usage_with_options(cat_file_usage, options);
}
+ if (batch.buffer_output < 0)
+ batch.buffer_output = batch.all_objects;
+
if (batch.enabled)
return batch_objects(&batch);
--
2.8.2.888.gecb1fe3
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