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Re: [RFC PATCH] pack-objects: write objects packed to trace2

On 4/9/2019 5:44 PM, Jonathan Tan wrote:
This is useful when investigating performance of pushes, and other times
when no progress information is written (because the pack is written to

Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx>
We're trying to improve push performance, and it would be nice to be
able to observe the number of objects sent over each push, both to
correlate it with time taken (which is already traced) and to notice
situations when significantly more objects are being sent than needed.

Sending this as an RFC because this patch works but is somewhat ad-hoc -
perhaps someone else has a more comprehensive solution.
  builtin/pack-objects.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index a154fc29f6..ac464d7d07 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -964,6 +964,7 @@ static void write_pack_file(void)
  	if (written != nr_result)
  		die(_("wrote %"PRIu32" objects while expecting %"PRIu32),
  		    written, nr_result);
+	trace2_printf("packed %d objects", nr_result);

For a simple field like this, you might want to use:

	trace2_data_intmax("pack-objects", the_repository,
			   "write_pack_file/wrote", nr_result);

This will give your message visibility in both the perf and event
targets.  The latter makes it easier for post-processing.