Memray Profiling Example

Once you have a Union account, install union:

pip install union

Export the following environment variable to build and push images to your own container registry:

        
# replace with your registry name
export IMAGE_SPEC_REGISTRY="<your-container-registry>"

Then run the following commands to run the workflow:

        
    
$ git clone https://github.com/unionai/unionai-examples
$ cd unionai-examples
$ union run --remote <path/to/file.py> <workflow_name> <params>

The source code for this tutorial can be found here.

Memray tracks and reports memory allocations, both in python code and in compiled extension modules. This Memray Profiling plugin enables memory tracking on the Flyte task level and renders a memgraph profiling graph on Flyte Deck.

        
import time

from flytekit import ImageSpec, task, workflow
from flytekitplugins.memray import memray_profiling

First, we use ImageSpec to construct a container that contains the dependencies for the tasks, we want to profile:

        
    
image = ImageSpec(
    name="memray_demo",
    packages=["flytekitplugins_memray"],
    registry="ghcr.io/flyteorg",  # Use your image registry
)

Next, we define a dummy function that generates data in memory without releasing:

        
    
def generate_data(n: int):
    leak_list = []
    for _ in range(n):  # Arbitrary large number for demonstration
        large_data = " " * 10**6  # 1 MB string
        leak_list.append(large_data)  # Keeps appending without releasing
        time.sleep(0.1)  # Slow down the loop to observe memory changes

Example of profiling the memory usage of generate_data() via the memray table html reporter

        
    
@task(container_image=image, enable_deck=True)
@memray_profiling(memray_html_reporter="table")
def memory_usage(n: int) -> str:
    generate_data(n=n)

    return "Well"

Example of profiling the memory leackage of generate_data() via the memray flamegraph html reporter

        
    
@task(container_image=image, enable_deck=True)
@memray_profiling(trace_python_allocators=True, memray_reporter_args=["--leaks"])
def memory_leakage(n: int) -> str:
    generate_data(n=n)

    return "Well"

Put everything together in a workflow.

        
    
@workflow
def wf(n: int = 500):
    memory_usage(n=n)
    memory_leakage(n=n)