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Re: [Libunwind-devel] Status of "libunwind" on HPUX/IA64

From: Jim Galarowicz
Subject: Re: [Libunwind-devel] Status of "libunwind" on HPUX/IA64
Date: Mon, 07 Nov 2011 11:52:36 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0) Gecko/20110927 Thunderbird/7.0

Hi all,

As a data point, we are using a snapshot of libunwind from July, 2011 in our OpenSpeedShop performance tool for the Columbia IA64 platform at NASA and it works well for our purposes.  I have not tried the 1.0.1 release, there, but we are in the process of testing how version 1.0.1 works in our tool.

Jim G.

On 11/07/2011 11:45 AM, David Mosberger-Tang wrote:

I don't think anybody every seriously pursued libunwind on HP-UX since HP-UX already had a processor-specific unwind API.  I just did some basic work to verify that libunwind could work in principle on HP-UX.  It's a fair amount of work to properly validate an unwind library on IA-64, so if you can live with a processor-specific API, you might be better off with Unwind or Unwind Express.

Having said that, the IA-64 tests in libunwind are quite extensive and if you could "make check" to pass (mostly) you'd probably be in good shape.

I haven't worked on IA-64 in several years, but I still have an Itanium box, so I might be able to at least help make sure the current libunwind works properly on IA-64 Linux.


On Mon, Nov 7, 2011 at 9:12 AM, Volker Simonis <address@hidden> wrote:
Hi David,

back in 2006, you advised to better not use libunwind on HPUX/IA64:

Now I saw in the current README file that the implementation on
HPUX/IA64 "Mostly works but [is] known to have some serious

What are these "serious limitations"?
Is there any documentation where we can find out more about the
limitations on HPUX?

If you would have to unwind mixed native(i.e. C/C++)/Java(i.e.
JITed/interpreted frames) on HPUX/IA64 today, would you advise to use

1. vanilla libunwind
2. Unwind Express Library
3. Unwind Library

Thank you in advance and best regards,

eGauge Systems LLC,, 1.877-EGAUGE1, fax 720.545.9768

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