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### What changes were proposed in this pull request? Introduce JVM profiling `JVMProfier` in Celeborn Worker using async-profiler to capture CPU and memory profiles. ### Why are the changes needed? [async-profiler](https://github.com/async-profiler) is a sampling profiler for any JDK based on the HotSpot JVM that does not suffer from Safepoint bias problem. It has low overhead and doesn’t rely on JVMTI. It avoids the safepoint bias problem by using the `AsyncGetCallTrace` API provided by HotSpot JVM to profile the Java code paths, and Linux’s perf_events to profile the native code paths. It features HotSpot-specific APIs to collect stack traces and to track memory allocations. The feature introduces a profier plugin that does not add any overhead unless enabled and can be configured to accept profiler arguments as a configuration parameter. It should support to turn profiling on/off, includes the jar/binaries needed for profiling. Backport [[SPARK-46094] Support Executor JVM Profiling](https://github.com/apache/spark/pull/44021). ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Worker cluster test. Closes #2409 from SteNicholas/CELEBORN-1299. Authored-by: SteNicholas <programgeek@163.com> Signed-off-by: Shuang <lvshuang.xjs@alibaba-inc.com>
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| Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at https://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. |
JVM Profiler
Since version 0.5.0, Celeborn supports JVM sampling profiler to capture CPU and memory profiles. This article provides a detailed guide of Celeborn Worker's code profiling.
Worker Code Profiling
The JVM profiler enables code profiling of workers based on the async profiler, a low overhead sampling profiler.
This allows a Worker instance to capture CPU and memory profiles for Worker which is later analyzed for performance issues.
The profiler captures Java Flight Recorder (jfr) files for each worker that can be read by tools like Java Mission Control and Intellij etc.
The profiler writes the jfr files to the Worker's working directory in the Worker's local file system and the files can grow to be large,
so it is advisable that the Worker machines have adequate storage.
Code profiling is currently only supported for
- Linux (x64)
- Linux (arm 64)
- Linux (musl, x64)
- MacOS
To get maximum profiling information set the following jvm options for the Worker :
-XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints -XX:+PreserveFramePointer
For more information on async_profiler see the Async Profiler Manual.
To enable code profiling, enable the code profiling in the configuration.
celeborn.worker.jvmProfiler.enabled true
For more configuration of code profiling refer to celeborn.worker.jvmProfiler.*.
Profiling Configuration Example
celeborn.worker.jvmProfiler.enabled true
celeborn.worker.jvmProfiler.options event=wall,interval=10ms,alloc=2m,lock=10ms,chunktime=300s