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package/pkg-generic.mk: increase precision of timestamps

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Currently, the timestamps that we keep in build-time.log use a
second-level precision. However, as we are going to introduce a new
type of graph to draw the time line of a build, this precision is
going to be insufficient, as a number of steps are so short that they
are not even one second long, and generally the rounding to the second
gives a not so great looking graph.

Therefore, we add to the timestamps the nanoseconds using the %N date
specifier. A milli-second precision would have been sufficient, but %N
is all what date(1) provides at the sub-second level.

Since this is changing the format of the build-time.log file, this
commit adjusts the support/scripts/graph-build-time script
accordingly, to account for the floating point numbers that we have as
timestamps.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Thomas Petazzoni 2018-09-21 15:31:16 +02:00
parent cf9344c45e
commit b2c24f584d
2 changed files with 2 additions and 2 deletions
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2
package/pkg-generic.mk
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@ -50,7 +50,7 @@ endef
# Time steps # Time steps
define step_time define step_time
printf "%s:%-5.5s:%-20.20s: %s\n" \ printf "%s:%-5.5s:%-20.20s: %s\n" \
"$$(date +%s)" "$(1)" "$(2)" "$(3)" \ "$$(date +%s.%N)" "$(1)" "$(2)" "$(3)" \
>>"$(BUILD_DIR)/build-time.log" >>"$(BUILD_DIR)/build-time.log"
endef endef
GLOBAL_INSTRUMENTATION_HOOKS += step_time GLOBAL_INSTRUMENTATION_HOOKS += step_time

2
support/scripts/graph-build-time
View File

@ -260,7 +260,7 @@ def read_data(input_file):
return None return None
for row in reader: for row in reader:
time = int(row[0].strip()) time = float(row[0].strip())
state = row[1].strip() state = row[1].strip()
step = row[2].strip() step = row[2].strip()
pkg = row[3].strip() pkg = row[3].strip()