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https://github.com/element-hq/synapse
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Guard registration of process-wide metrics by existence of the requisite /proc entries
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parent
981f852d54
commit
1b179455fc
1 changed files with 45 additions and 40 deletions
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@ -115,6 +115,10 @@ def render_all():
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TICKS_PER_SEC = 100
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BYTES_PER_PAGE = 4096
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HAVE_PROC_STAT = os.path.exists("/proc/stat")
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HAVE_PROC_SELF_STAT = os.path.exists("/proc/self/stat")
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HAVE_PROC_SELF_LIMITS = os.path.exists("/proc/self/limits")
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rusage = None
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stats = None
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fd_counts = None
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@ -122,13 +126,11 @@ fd_counts = None
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# In order to report process_start_time_seconds we need to know the machine's
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# boot time, because the value in /proc/self/stat is relative to this
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boot_time = None
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try:
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if HAVE_PROC_STAT:
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with open("/proc/stat") as _procstat:
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for line in _procstat:
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if line.startswith("btime "):
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boot_time = int(line.split()[1])
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except IOError:
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pass
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TYPES = {
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stat.S_IFSOCK: "SOCK",
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@ -144,11 +146,12 @@ def update_resource_metrics():
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global rusage
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rusage = getrusage(RUSAGE_SELF)
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global stats
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with open("/proc/self/stat") as s:
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line = s.read()
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# line is PID (command) more stats go here ...
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stats = line.split(") ", 1)[1].split(" ")
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if HAVE_PROC_SELF_STAT:
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global stats
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with open("/proc/self/stat") as s:
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line = s.read()
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# line is PID (command) more stats go here ...
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stats = line.split(") ", 1)[1].split(" ")
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global fd_counts
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fd_counts = _process_fds()
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@ -195,43 +198,45 @@ get_metrics_for("process").register_callback("fds", _process_fds, labels=["type"
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## New prometheus-standard metric names
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process_metrics = get_metrics_for("process");
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process_metrics.register_callback(
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"cpu_user_seconds_total", lambda: float(stats[11]) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"cpu_system_seconds_total", lambda: float(stats[12]) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"cpu_seconds_total", lambda: (float(stats[11]) + float(stats[12])) / TICKS_PER_SEC
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)
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if HAVE_PROC_SELF_STAT:
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process_metrics.register_callback(
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"cpu_user_seconds_total", lambda: float(stats[11]) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"cpu_system_seconds_total", lambda: float(stats[12]) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"cpu_seconds_total", lambda: (float(stats[11]) + float(stats[12])) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"virtual_memory_bytes", lambda: int(stats[20])
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)
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process_metrics.register_callback(
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"resident_memory_bytes", lambda: int(stats[21]) * BYTES_PER_PAGE
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)
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process_metrics.register_callback(
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"virtual_memory_bytes", lambda: int(stats[20])
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)
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process_metrics.register_callback(
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"resident_memory_bytes", lambda: int(stats[21]) * BYTES_PER_PAGE
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)
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process_metrics.register_callback(
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"open_fds", lambda: sum(fd_counts.values())
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)
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process_metrics.register_callback(
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"open_fds", lambda: sum(fd_counts.values())
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)
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def _get_max_fds():
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with open("/proc/self/limits") as limits:
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for line in limits:
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if not line.startswith("Max open files "):
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continue
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# Line is Max open files $SOFT $HARD
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return int(line.split()[3])
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return None
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process_metrics.register_callback(
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"start_time_seconds", lambda: boot_time + int(stats[19]) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"max_fds", lambda: _get_max_fds()
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)
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if HAVE_PROC_SELF_LIMITS:
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def _get_max_fds():
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with open("/proc/self/limits") as limits:
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for line in limits:
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if not line.startswith("Max open files "):
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continue
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# Line is Max open files $SOFT $HARD
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return int(line.split()[3])
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return None
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process_metrics.register_callback(
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"start_time_seconds", lambda: boot_time + int(stats[19]) / TICKS_PER_SEC
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)
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process_metrics.register_callback(
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"max_fds", lambda: _get_max_fds()
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)
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reactor_metrics = get_metrics_for("reactor")
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tick_time = reactor_metrics.register_distribution("tick_time")
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