[lttng-docs.git] / contents / using-lttng / instrumenting / advanced-techniques / 32-bit-on-64-bit / intro.md

---
id: instrumenting-32-bit-app-on-64-bit-system
---

In order to trace a 32-bit application running on a 64-bit system,
LTTng must use a dedicated 32-bit
[consumer daemon](#doc-lttng-consumerd). This section discusses how to
build that daemon (which is _not_ part of the default 64-bit LTTng
build) and the LTTng 32-bit tracing libraries, and how to instrument
a 32-bit application in that context.

Make sure you install all 32-bit versions of LTTng dependencies.
Their names can be found in the `README.md` files of each LTTng package
source. How to find and install them depends on your target's
Linux distribution. `gcc-multilib` is a common package name for the
multilib version of GCC, which you also need.

The following packages will be built for 32-bit support on a 64-bit
system: <a href="http://urcu.so/" class="ext">Userspace RCU</a>,
LTTng-UST and LTTng-tools.
Commit	Line	Data
5e0cbfb0 PP	1	---
	2	id: instrumenting-32-bit-app-on-64-bit-system
	3	---
	4
	5	In order to trace a 32-bit application running on a 64-bit system,
	6	LTTng must use a dedicated 32-bit
	7	[consumer daemon](#doc-lttng-consumerd). This section discusses how to
	8	build that daemon (which is _not_ part of the default 64-bit LTTng
	9	build) and the LTTng 32-bit tracing libraries, and how to instrument
	10	a 32-bit application in that context.
	11
	12	Make sure you install all 32-bit versions of LTTng dependencies.
	13	Their names can be found in the `README.md` files of each LTTng package
47bfcb75	14	source. How to find and install them depends on your target's
5e0cbfb0	15	Linux distribution. `gcc-multilib` is a common package name for the
47bfcb75	16	multilib version of GCC, which you also need.
5e0cbfb0 PP	17
	18	The following packages will be built for 32-bit support on a 64-bit
	19	system: <a href="http://urcu.so/" class="ext">Userspace RCU</a>,
	20	LTTng-UST and LTTng-tools.