Tracking Native Memory used by Gurobi in Java

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Daniel Özcan

• 2024年10月16日 08:41

I am using Gurobi in Java with Gurobi's Java API. I would like to track the full memory footprint of a Gurobi-based solution to a problem with other solutions, such as SAT solvers. Currently I am using Java JMH garbage collection profiler, but I have become aware that this does not include Gurobi's native memory used during solving. Can anyone recommend a method to measure Gurobi's native memory on top the Java's heap allocations?

関連するエンティティ

• Memory
• Java

0

• 

  Riley Clement

  Gurobi Staff

  • 2024年10月20日 23:48

  Hi Daniel,

  I use psrecord when profiling memory with Gurobi through our Python API.

  According to ChatGPT you could also use it for Gurobi & Java API.  You would need to install it in a Python environment though and pass it the java command as an arguments.

  Yes, **`psrecord`** is a good choice for tracking memory usage, including native memory, while running a Java program that uses Gurobi. `psrecord` monitors and records the memory and CPU usage of a specific process over time. It works well for capturing the entire memory footprint, which includes both the Java heap and native memory allocated by the Gurobi solver.

  ### How to Use `psrecord`

  1. **Install psrecord**:
     You can install `psrecord` using `pip` if it's not already installed:
     ```bash
     pip install psrecord
     ```

  2. **Run psrecord**:
     Start your Java process and find its process ID (`PID`). Once you have the `PID`, use `psrecord` to track the memory and CPU usage. For example:
     ```bash
     psrecord <PID> --interval 1 --plot memory_cpu_usage.png --log memory_cpu_usage.txt
     ```

     This command will:
     - Record the memory and CPU usage of the process with the specified `PID`.
     - Take samples every second (`--interval 1`).
     - Save the results to a log file (`memory_cpu_usage.txt`) and generate a plot (`memory_cpu_usage.png`).

  3. **Monitor Both Heap and Native Memory**:
     `psrecord` captures the **resident set size (RSS)**, which is the portion of memory occupied by a process in RAM. This includes:
     - Java heap memory managed by the JVM.
     - Native memory allocations performed by the Gurobi C library.

     By analyzing the log file and generated plot, you can see how the memory usage evolves over time during the optimization process.

  ### Advantages of Using `psrecord`
  - **Easy setup**: No need for invasive instrumentation in your Java or Gurobi code.
  - **Comprehensive memory monitoring**: Tracks the entire process memory, including native allocations.
  - **CPU profiling**: Provides additional insight into CPU usage alongside memory data.

  This approach is especially useful when you want a high-level overview of memory usage without delving into deeper C/C++ integrations or setting up detailed memory profilers.

  It is a ChatGPT answer though so take it with a grain of salt.

  - Riley

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