measure task cpu and disk percentage

Author: elfkuzco

backend/src/zimfarm_backend/common/schemas/orms.py

@@ -113,14 +113,18 @@ class TaskContainerProgressSchema(BaseModel):
     total: int | None = None
 
 
-class TaskContainerMemoryStatsSchema(BaseModel):
-    max_usage: int | None = None
+class TaskResourceUsageSchema(BaseModel):
+    max_usage: int | float | None = Field(default=None, alias="max")
 
 
-class TaskContainerStatsSchema(BaseModel):
-    memory: TaskContainerMemoryStatsSchema = Field(
-        default_factory=TaskContainerMemoryStatsSchema
-    )
+class TaskCPUUsageSchema(TaskResourceUsageSchema):
+    avg_usage: float | None = Field(default=None, alias="avg")
+
+
+class TaskStatsSchema(BaseModel):
+    memory: TaskResourceUsageSchema = Field(default_factory=TaskResourceUsageSchema)
+    cpu: TaskCPUUsageSchema = Field(default_factory=TaskCPUUsageSchema)
+    disk: TaskResourceUsageSchema = Field(default_factory=TaskResourceUsageSchema)
 
 
 class TaskContainerSchema(BaseModel):
@@ -130,7 +134,7 @@ class TaskContainerSchema(BaseModel):
 
     log: str | None = None
     image: str | None = None
-    stats: dict[str, Any] | None = None
+    stats: TaskStatsSchema | None = None
     artifacts: str | None = None
     stderr: str | None = None
     stdout: str | None = None

frontend-ui/src/types/tasks.ts

@@ -32,6 +32,15 @@ export interface TaskFile {
   info?: TaskFileInfo
 }
 
+export interface TaskResourceUsage {
+  max?: number | null
+}
+
+export interface TaskCPUUsage {
+  max?: number
+  avg?: number
+}
+
 export interface TaskContainer {
   command: string[]
   exit_code?: number
@@ -46,9 +55,9 @@ export interface TaskContainer {
     total: number
   } | null
   stats?: {
-    memory?: {
-      max_usage?: number | null
-    }
+    memory?: TaskResourceUsage
+    disk?: TaskResourceUsage
+    cpu?: TaskCPUUsage
   }
 }
 

frontend-ui/src/views/TaskDetailView.vue

@@ -324,13 +324,55 @@
                       <code class="text-pink-accent-2">{{ taskContainer.exit_code }}</code>
                     </td>
                   </tr>
-                  <tr v-if="maxMemory != null">
+                  <tr v-if="hasStats">
                     <th class="text-left w-20">Stats</th>
                     <td>
-                      <v-chip size="small" class="mr-2">
-                        <v-icon size="small" class="mr-1">mdi-memory</v-icon>
-                        {{ maxMemory }} (max)
-                      </v-chip>
+                      <div class="d-flex flex-wrap ga-2">
+                        <v-tooltip
+                          v-if="maxMemory"
+                          text="Maximum memory used during task execution"
+                        >
+                          <template #activator="{ props }">
+                            <v-chip v-bind="props" size="small">
+                              <v-icon size="small" class="mr-1">mdi-memory</v-icon>
+                              {{ maxMemory }} (max)
+                            </v-chip>
+                          </template>
+                        </v-tooltip>
+                        <v-tooltip
+                          v-if="maxDisk"
+                          text="Maximum disk space used during task execution"
+                        >
+                          <template #activator="{ props }">
+                            <v-chip v-bind="props" size="small">
+                              <v-icon size="small" class="mr-1">mdi-harddisk</v-icon>
+                              {{ maxDisk }} (max)
+                            </v-chip>
+                          </template>
+                        </v-tooltip>
+                        <v-tooltip
+                          v-if="hasCpuStats && cpuStats && cpuStats.max !== null"
+                          text="Maximum CPU usage percentage during task execution"
+                        >
+                          <template #activator="{ props }">
+                            <v-chip v-bind="props" size="small">
+                              <v-icon size="small" class="mr-1">mdi-cpu-64-bit</v-icon>
+                              {{ cpuStats.max.toFixed(1) }}% (max)
+                            </v-chip>
+                          </template>
+                        </v-tooltip>
+                        <v-tooltip
+                          v-if="hasCpuStats && cpuStats && cpuStats.avg !== null"
+                          text="Average CPU usage percentage during task execution"
+                        >
+                          <template #activator="{ props }">
+                            <v-chip v-bind="props" size="small">
+                              <v-icon size="small" class="mr-1">mdi-chart-line</v-icon>
+                              {{ cpuStats.avg.toFixed(1) }}% (avg)
+                            </v-chip>
+                          </template>
+                        </v-tooltip>
+                      </div>
                     </td>
                   </tr>
                   <tr v-if="taskProgress">
@@ -578,12 +620,37 @@ const canCancel = computed(() => {
 
 const maxMemory = computed(() => {
   try {
-    return formattedBytesSize(taskContainer.value?.stats?.memory?.max_usage || 0)
+    return formattedBytesSize(taskContainer.value?.stats?.memory?.max || 0)
+  } catch {
+    return null
+  }
+})
+
+const maxDisk = computed(() => {
+  try {
+    return formattedBytesSize(taskContainer.value?.stats?.disk?.max || 0)
   } catch {
     return null
   }
 })
 
+const cpuStats = computed(() => {
+  const stats = taskContainer.value?.stats?.cpu
+  if (!stats) return null
+  return {
+    max: stats.max ?? null,
+    avg: stats.avg ?? null,
+  }
+})
+
+const hasCpuStats = computed(() => {
+  return cpuStats.value && (cpuStats.value.max !== null || cpuStats.value.avg !== null)
+})
+
+const hasStats = computed(() => {
+  return maxMemory.value || maxDisk.value || hasCpuStats.value
+})
+
 const monitoringUrl = computed(() => {
   return `http://monitoring.openzim.org/host/${scheduleName.value}_${shortId.value}.${
     task.value?.worker_name

worker/src/zimfarm_worker/task/worker.py

@@ -40,6 +40,9 @@
 from zimfarm_worker.task.zim import get_zim_info
 
 SLEEP_INTERVAL = 60  # nb of seconds to sleep before watching
+CPU_EWMA_ALPHA = 0.01  # EWMA smoothing factor for CPU percentage samples (0..1)
+
+
 PENDING = "pending"
 DOING = "doing"
 DONE = "done"
@@ -132,6 +135,9 @@ def __init__(
         self.scraper_succeeded: bool | None = None  # whether scraper succeeded
 
         self.max_memory_usage: int = 0  # maximum memory used by scraper
+        self.max_disk_usage: int = 0  # maximum disk used by scraper
+        self.avg_cpu_usage: float = 0.0  # cpu exponential moving weighted average
+        self.max_cpu_usage: float = 0.0  # maximum cpu percentage used by scraper
 
         # register stop/^C
         self.register_signals()
@@ -192,8 +198,62 @@ def mark_scraper_completed(self, exit_code: int, stdout: str, stderr: str):
             }
         )
 
+    def _get_scraper_disk_usage(self) -> int:
+        """
+        Get disk usage of scraper container's task workdir in bytes.
+
+        Calculates the actual disk space used by files in the scraper's
+        task workdir (where ZIM files and other outputs are written).
+        """
+        if not self.task_workdir:
+            return 0
+
+        try:
+            if self.task_workdir.exists() and self.task_workdir.is_dir():
+                return sum(
+                    f.stat().st_size
+                    for f in self.task_workdir.rglob("*")
+                    if f.is_file()
+                )
+            return 0
+        except Exception:
+            logger.exception("Failed to get scraper disk usage")
+            return 0
+
+    def _compute_scraper_cpu_stats(self, scraper_stats: dict[str, Any]) -> float:
+        """
+        Compute CPU usage statistics from scraper container stats.
+
+        Calculates CPU percentage with EWMA smoothing to reduce effect of
+        short spikes.
+        """
+        cpu_sample = 0.0
+        cpu_stats = scraper_stats.get("cpu_stats", {})
+        precpu_stats = scraper_stats.get("precpu_stats", {})
+        prev_total = precpu_stats.get("cpu_usage", {}).get("total_usage", 0)
+        curr_total = cpu_stats.get("cpu_usage", {}).get("total_usage", 0)
+        prev_system = precpu_stats.get("system_cpu_usage", 0)
+        curr_system = cpu_stats.get("system_cpu_usage", 0)
+
+        delta_cpu = curr_total - prev_total
+        delta_system = curr_system - prev_system
+        online_cpus = cpu_stats.get("online_cpus", 0)
+
+        if delta_system > 0 and delta_cpu >= 0 and online_cpus > 0:
+            cpu_sample = (delta_cpu / float(delta_system)) * float(online_cpus) * 100.0
+
+        # apply EWMA smoothing to reduce effect of short spikes
+        if self.avg_cpu_usage == 0.0:
+            self.avg_cpu_usage = cpu_sample
+        else:
+            self.avg_cpu_usage = (
+                CPU_EWMA_ALPHA * cpu_sample
+                + (1.0 - CPU_EWMA_ALPHA) * self.avg_cpu_usage
+            )
+        return cpu_sample
+
     def submit_scraper_progress(self):
-        """report last lines of scraper to the API"""
+        """report scraper statistics and logs to the API"""
         if not self.scraper:
             logger.error("No scraper to update")
             return
@@ -204,17 +264,32 @@ def submit_scraper_progress(self):
             stream=False
         )
         scraper_stats = cast(dict[str, Any], scraper_stats)
+
         # update statistics
         self.max_memory_usage = max(
             [
                 scraper_stats.get("memory_stats", {}).get("usage", 0),
                 self.max_memory_usage,
             ]
         )
+
+        cpu_sample = self._compute_scraper_cpu_stats(scraper_stats)
+        self.max_cpu_usage = max([cpu_sample, self.max_cpu_usage])
+
+        disk_usage = self._get_scraper_disk_usage()
+        self.max_disk_usage = max([disk_usage, self.max_disk_usage])
+
         stats: dict[str, Any] = {
             "memory": {
                 "max_usage": self.max_memory_usage,
-            }
+            },
+            "cpu": {
+                "max_usage": self.max_cpu_usage,
+                "avg_usage": round(self.avg_cpu_usage, 2),
+            },
+            "disk": {
+                "max_usage": self.max_disk_usage,
+            },
         }
 
         # fetch and compute progression from progress file