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Analyzer java-allocation

java-allocation: Java Runtime Allocation Slow-Path Sizes.

Name

java-allocation - Java Runtime Allocation Slow-Path Sizes

This analyzer measures object allocations that enter HotSpot’s runtime allocation slow path and groups the retained samples by object size. The summary shows the number of retained samples, their minimum, average, and maximum sizes, the summed bytes in those samples, and the long-tail size buckets. Normal JIT-inlined TLAB allocations do not enter these probes, and max_samples also limits how many samples are kept, so this is not a complete heap-allocation census.

Resource Category

Memory.

Application Type & Technical Stack

  • Java

Command Line Syntax

The analyzer can be invoked directly on the command-line via the orxray utility from the openresty-xray-cli software package.

Alternatively, the analyzer can also be invoked manually or automatically on the web console UI of OpenResty XRay (like on the Advanced web page).

# PID is the target process PID.
orxray analyzer run java-allocation -p PID

# trace a shell command directly
orxray analyzer run java-allocation -c SHELL_CMD

# PGID is the process group ID or any process's PID within the target process
# group.
orxray analyzer run java-allocation -p -PGID

# trace any processes started from the specified executable path.
orxray analyzer run java-allocation --exe /path/to/exe/file

Tracing Multiple Processes

Supported.

Output Formats

  • Histogram Bar Charts
  • Plain Texts

Author

The OpenResty Inc. Team.

Copyright (C) by OpenResty Inc. All rights reserved.