UProcTrace: User-space Process Tracing

UProcTrace traces process executions and process ends on Linux systems.

On process starts, UProcTrace records the time, the entire command line, working directory and environment. On process end, it logs the CPU time used by the process (split by user and kernel time) and the peak memory usage.

UProcTrace is implemented in user-space, so does not reuire any special kernel modules. This means it can also be used in containers (e.g. docker) without any changes the to conteiner host. The implementation is based on the LD_PRELOAD mechanism. A shared library is injected into each process started. This libarary records trace events at begin of the process (when the preload library is initialized) and at the end of the process (when the library is de-initiazlied).

Building

UProcTrace is developed on Debian Linux 10 "buster".

Install the prerequisites:

apt-get install -y build-essential cmake gcc \
                   libprotobuf-c-dev libprotobuf-dev
                   ninja-build \
                   protobuf-c-compiler protobuf-compiler \
                   python3 python3-protobuf

Change to the directory of this REAMDE.md file.

Configure a build directory:

mkdir build
cd build
cmake -G Ninja -D CMAKE_BUILD_TYPE=Release ..

Build:

ninja

Run tests:

ctest

Set up for direct usage from build directory (to be done in each shell):

source exports

Tracing Applications

To trace an application, prefix the command with upt-trace and the file name for the trace. For example, to trace the command

/usr/bin/printf "trace me"

run the following command:

upt-trace mytrace.proto /usr/bin/printf "trace me"

To show the recorded events, run:

upt-dump mytrace.proto

Example: Trace Build Process

To show the capabilities of the UProcTrace, a process that calls several child processes is required. In this example, the build of UProcTrace is used for this purpose.

Change to the build directory.

Start a new shell to be traced:

upt-trace mytrace.proto bash

Configure another build directory for this tracing example and run the build:

mkdir example_trace_build
cd example_trace_build
cmake -G Ninja -D CMAKE_BUILD_TYPE=Release ../..
ninja

Stop tracing by ending the shell:

exit

Show traced information:

upt-dump mytrace.proto