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Track DB scheduling delay per-request

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For each request, track the amount of time spent waiting for a db
connection. This entails adding it to the LoggingContext and we may as well add
metrics for it while we are passing.
This commit is contained in:
Richard van der Hoff 2018-01-12 00:27:14 +00:00
parent 0f5d2cc37c
commit 3d12d97415
5 changed files with 43 additions and 4 deletions
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14
synapse/util/metrics.py
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@ -80,6 +80,11 @@ block_db_txn_duration = metrics.register_counter(
),
)
# seconds spent waiting for a db connection, in this block
block_db_sched_duration = metrics.register_counter(
"block_db_sched_duration_seconds", labels=["block_name"],
)
def measure_func(name):
def wrapper(func):
@ -96,7 +101,9 @@ def measure_func(name):
class Measure(object):
__slots__ = [
"clock", "name", "start_context", "start", "new_context", "ru_utime",
"ru_stime", "db_txn_count", "db_txn_duration_ms", "created_context"
"ru_stime",
"db_txn_count", "db_txn_duration_ms", "db_sched_duration_ms",
"created_context",
]
def __init__(self, clock, name):
@ -117,6 +124,7 @@ class Measure(object):
self.ru_utime, self.ru_stime = self.start_context.get_resource_usage()
self.db_txn_count = self.start_context.db_txn_count
self.db_txn_duration_ms = self.start_context.db_txn_duration_ms
self.db_sched_duration_ms = self.start_context.db_sched_duration_ms
def __exit__(self, exc_type, exc_val, exc_tb):
if isinstance(exc_type, Exception) or not self.start_context:
@ -149,6 +157,10 @@ class Measure(object):
(context.db_txn_duration_ms - self.db_txn_duration_ms) / 1000.,
self.name
)
block_db_sched_duration.inc_by(
(context.db_sched_duration_ms - self.db_sched_duration_ms) / 1000.,
self.name
)
if self.created_context:
self.start_context.__exit__(exc_type, exc_val, exc_tb)