diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py
index a79fb026d4..323328061a 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -115,6 +115,10 @@ def render_all():
TICKS_PER_SEC = 100
BYTES_PER_PAGE = 4096
+HAVE_PROC_STAT = os.path.exists("/proc/stat")
+HAVE_PROC_SELF_STAT = os.path.exists("/proc/self/stat")
+HAVE_PROC_SELF_LIMITS = os.path.exists("/proc/self/limits")
+
rusage = None
stats = None
fd_counts = None
@@ -122,13 +126,11 @@ fd_counts = None
# In order to report process_start_time_seconds we need to know the machine's
# boot time, because the value in /proc/self/stat is relative to this
boot_time = None
-try:
+if HAVE_PROC_STAT:
with open("/proc/stat") as _procstat:
for line in _procstat:
if line.startswith("btime "):
boot_time = int(line.split()[1])
-except IOError:
- pass
TYPES = {
stat.S_IFSOCK: "SOCK",
@@ -144,11 +146,12 @@ def update_resource_metrics():
global rusage
rusage = getrusage(RUSAGE_SELF)
- global stats
- with open("/proc/self/stat") as s:
- line = s.read()
- # line is PID (command) more stats go here ...
- stats = line.split(") ", 1)[1].split(" ")
+ if HAVE_PROC_SELF_STAT:
+ global stats
+ with open("/proc/self/stat") as s:
+ line = s.read()
+ # line is PID (command) more stats go here ...
+ stats = line.split(") ", 1)[1].split(" ")
global fd_counts
fd_counts = _process_fds()
@@ -195,43 +198,45 @@ get_metrics_for("process").register_callback("fds", _process_fds, labels=["type"
## New prometheus-standard metric names
process_metrics = get_metrics_for("process");
-process_metrics.register_callback(
- "cpu_user_seconds_total", lambda: float(stats[11]) / TICKS_PER_SEC
-)
-process_metrics.register_callback(
- "cpu_system_seconds_total", lambda: float(stats[12]) / TICKS_PER_SEC
-)
-process_metrics.register_callback(
- "cpu_seconds_total", lambda: (float(stats[11]) + float(stats[12])) / TICKS_PER_SEC
-)
-
-process_metrics.register_callback(
- "virtual_memory_bytes", lambda: int(stats[20])
-)
-process_metrics.register_callback(
- "resident_memory_bytes", lambda: int(stats[21]) * BYTES_PER_PAGE
-)
-
-process_metrics.register_callback(
- "open_fds", lambda: sum(fd_counts.values())
-)
-
-def _get_max_fds():
- with open("/proc/self/limits") as limits:
- for line in limits:
- if not line.startswith("Max open files "):
- continue
- # Line is Max open files $SOFT $HARD
- return int(line.split()[3])
- return None
-
-process_metrics.register_callback(
- "max_fds", lambda: _get_max_fds()
-)
-
-process_metrics.register_callback(
- "start_time_seconds", lambda: boot_time + int(stats[19]) / TICKS_PER_SEC
-)
+if HAVE_PROC_SELF_STAT:
+ process_metrics.register_callback(
+ "cpu_user_seconds_total", lambda: float(stats[11]) / TICKS_PER_SEC
+ )
+ process_metrics.register_callback(
+ "cpu_system_seconds_total", lambda: float(stats[12]) / TICKS_PER_SEC
+ )
+ process_metrics.register_callback(
+ "cpu_seconds_total", lambda: (float(stats[11]) + float(stats[12])) / TICKS_PER_SEC
+ )
+
+ process_metrics.register_callback(
+ "virtual_memory_bytes", lambda: int(stats[20])
+ )
+ process_metrics.register_callback(
+ "resident_memory_bytes", lambda: int(stats[21]) * BYTES_PER_PAGE
+ )
+
+ process_metrics.register_callback(
+ "open_fds", lambda: sum(fd_counts.values())
+ )
+
+ process_metrics.register_callback(
+ "start_time_seconds", lambda: boot_time + int(stats[19]) / TICKS_PER_SEC
+ )
+
+if HAVE_PROC_SELF_LIMITS:
+ def _get_max_fds():
+ with open("/proc/self/limits") as limits:
+ for line in limits:
+ if not line.startswith("Max open files "):
+ continue
+ # Line is Max open files $SOFT $HARD
+ return int(line.split()[3])
+ return None
+
+ process_metrics.register_callback(
+ "max_fds", lambda: _get_max_fds()
+ )
reactor_metrics = get_metrics_for("reactor")
tick_time = reactor_metrics.register_distribution("tick_time")
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