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Cut the raw /proc/self/stat line up into named fields at collection time

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This commit is contained in:
Paul "LeoNerd" Evans 2016-10-19 18:21:40 +01:00
parent 3ae48a1f99
commit 6453d03edd
1 changed files with 22 additions and 8 deletions
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30
synapse/metrics/process_collector.py
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@ -41,9 +41,18 @@ TYPES = {
stat.S_IFIFO: "FIFO", stat.S_IFIFO: "FIFO",
} }
# Field indexes from /proc/self/stat, taken from the proc(5) manpage
STAT_FIELDS = {
"utime": 14,
"stime": 15,
"starttime": 22,
"vsize": 23,
"rss": 24,
}
rusage = None rusage = None
stats = None stats = {}
fd_counts = None fd_counts = None
# In order to report process_start_time_seconds we need to know the # In order to report process_start_time_seconds we need to know the
@ -66,7 +75,12 @@ def update_resource_metrics():
with open("/proc/self/stat") as s: with open("/proc/self/stat") as s:
line = s.read() line = s.read()
# line is PID (command) more stats go here ... # line is PID (command) more stats go here ...
stats = line.split(") ", 1)[1].split(" ") raw_stats = line.split(") ", 1)[1].split(" ")
for (name, index) in STAT_FIELDS.iteritems():
# subtract 3 from the index, because proc(5) is 1-based, and
# we've lost the first two fields in PID and COMMAND above
stats[name] = int(raw_stats[index - 3])
global fd_counts global fd_counts
fd_counts = _process_fds() fd_counts = _process_fds()
@ -119,24 +133,24 @@ def register_process_collector():
if HAVE_PROC_SELF_STAT: if HAVE_PROC_SELF_STAT:
process_metrics.register_callback( process_metrics.register_callback(
"cpu_user_seconds_total", lambda: float(stats[11]) / TICKS_PER_SEC "cpu_user_seconds_total", lambda: float(stats["utime"]) / TICKS_PER_SEC
) )
process_metrics.register_callback( process_metrics.register_callback(
"cpu_system_seconds_total", lambda: float(stats[12]) / TICKS_PER_SEC "cpu_system_seconds_total", lambda: float(stats["stime"]) / TICKS_PER_SEC
) )
process_metrics.register_callback( process_metrics.register_callback(
"cpu_seconds_total", lambda: (float(stats[11]) + float(stats[12])) / TICKS_PER_SEC "cpu_seconds_total", lambda: (float(stats["utime"]) + float(stats["stime"])) / TICKS_PER_SEC
) )
process_metrics.register_callback( process_metrics.register_callback(
"virtual_memory_bytes", lambda: int(stats[20]) "virtual_memory_bytes", lambda: int(stats["vsize"])
) )
process_metrics.register_callback( process_metrics.register_callback(
"resident_memory_bytes", lambda: int(stats[21]) * BYTES_PER_PAGE "resident_memory_bytes", lambda: int(stats["rss"]) * BYTES_PER_PAGE
) )
process_metrics.register_callback( process_metrics.register_callback(
"start_time_seconds", lambda: boot_time + int(stats[19]) / TICKS_PER_SEC "start_time_seconds", lambda: boot_time + int(stats["starttime"]) / TICKS_PER_SEC
) )
if HAVE_PROC_SELF_FD: if HAVE_PROC_SELF_FD: