Intel® Parallel Studio XE 2018 Composer Edition Fortran - Debug Solutions Release Notes

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已更新 6/28/2017
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This page provides the current Release Notes for the Debug Solutions from Intel® Parallel Studio XE 2018 Composer Edition for Fortran Linux*, Windows* and OS X*/macOS* products.

To get product updates, log in to the Intel® Software Development Products Registration Center.

For questions or technical support, visit Intel® Software Products Support.

For the top-level Release Notes, visit:

Table of Contents:

Change History

This section highlights important from the previous product version and changes in product updates.

Changes since Intel® Parallel Studio XE 2017 Composer Edition

  • Support for Intel(R) Xeon Phi(TM) Product Family x200 (formerly code named Knights Landing)
  • BKM provided below If Knights Landing debugging inside Visual Studio fails to attach to the Knights Landing targets

Product Contents

  • Linux*:
    • GNU* Project Debugger (GDB) 7.12:
      Command line for host CPU and Intel® Xeon Phi™ coprocessor, and Eclipse* IDE plugin for offload enabled applications.
  • OS X*/macOS*:
    • GNU* Project Debugger (GDB) 7.12:
      Command line for CPU only.
  • Windows*:
    • Intel® Debugger Extension for Intel® Many Integrated Core Architecture (Intel® MIC Architecture)
    • Fortran Expression Evaluator (FEE) as extension to debugger of Microsoft Visual Studio* 

GNU* GDB

This section summarizes the changes, new features, customizations and known issues related to the GNU* GDB provided with Intel® Parallel Studio XE 2018 Composer Edition.
 

Features

GNU* GDB provided with Intel® Parallel Studio XE 2018 Composer Edition and above is based on GDB 7.12 with additional enhancements provided by Intel. This debugger replaces the Intel® Debugger from previous releases. In addition to features found in GDB 7.12, there are several other new features:
  • Intel® Processor Trace (Intel® PT) support for 5th generation Intel® Core™ Processors:
    (gdb) record btrace pt
  • Support for Intel® Xeon Phi™ coprocessor & processor X200
  • Support for Intel® Transactional Synchronization Extensions (Intel® TSX) (Linux & OSX)
  • Register support for Intel® Memory Protection Extensions (Intel® MPX) and Intel® Advanced Vector Extensions 512 (Intel® AVX-512)
  • Data Race Detection (pdbx):
    Detect and locate data races for applications threaded using POSIX* thread (pthread) or OpenMP* models
  • Branch Trace Store (btrace):
    Record branches taken in the execution flow to backtrack easily after events like crashes, signals, exceptions, etc.
All features are available for Linux*, but only Intel® TSX is supported for OS X*/macOS*.
 

Using GNU* GDB

GNU* GDB provided with Intel® Parallel Studio XE 2018 Composer Edition comes in different versions:
  • IA-32/Intel® 64 debugger:
    Debug applications natively on IA-32 or Intel® 64 systems with gdb-ia on the command line.
    A standard Eclipse* IDE can be used for this as well if a graphical user interface is desired.
  • Intel® Xeon Phi™ coprocessor debugger (only for Linux*):
    Debug applications remotely on Intel® Xeon Phi™ coprocessor systems. The debugger will run on a host system and a debug agent (gdbserver) on the coprocessor.
    There are two options:
    • Use the command line version of the debugger with gdb-mic.
      This only works for native Intel® Xeon Phi™ coprocessor X100 applications. For Intel® Xeon Phi™ coprocessor & processor X200 use gdb-ia.
      A standard Eclipse* IDE can be used for this as well if a graphical user interface is desired.
    • Use an Eclipse* IDE plugin shipped with Intel® Parallel Studio XE 2018 Composer Edition.
      This works only for offload enabled Intel® Xeon Phi™ coprocessor applications. Instructions on how to use GNU* GDB can be found in the Documentation section.

Documentation

The documentation for the provided GNU* GDB can be found here:
<install-dir>/documentation_2018/en/debugger/gdb-ia/gdb.pdf
<install-dir>/documentation_2018/en/debugger/ps2018/get_started.htm

The latter is available online as well:

Known Issues and Changes

Knights Landing Debugging in Visual Studio

If Knights Landing debugging inside Visual Studio fails to attach to the Knights Landing targets, try the following 2 steps:
1) Resolving the IP address of the mic card

  • Open the Intel Compiler x64 environment command prompt.
  • Check if the mic0 card address can be resolved: DOS> ping mic0
  • If that fails to find the mic0 card, then you need to register it manually, otherwise continue with 2).
  • First we need to find out the IP address of the mic0 card: DOS> ipconfig
  • Search for the mic0 adapter IP address. The mic0 card IP address is the same just with 1 as last digit.
  • Then add the following line to the hosts file in C:\Windows\system32\drivers\etc\hosts.
  • <mic0-IP-address> mic0
  • (If you have more then 1 mic card, you need to make the same also for mic1, …)
  • Afterwards reboot your PC.

2) Running the MIC application in the Intel Compiler Environment

  • If you want to run or debug a MIC application ALWAYS use the Intel Compiler x64 environment command prompt!
  • To debug the mic application start Visual Studio from this corrected the Intel Compiler x64 environment command prompt:
  • DOS> C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\devenv.com

Not found: libncurses.so.5

On some systems, using the GNU* GDB version that is provided by Intel, fails due to a missing libncurses.so.5 (e.g. Fedora 24 and 25). Please install the package ncurses-compat-libs which provides the missing library.

Not found: libtinfo.so.5

On some systems, using the GNU* GDB version that is provided by Intel, fails due to a missing libtinfo.so.5 (e.g. SLES 11 SP3). If a package for libtinfo is not available, the following workaround can be applied:

$ sudo ln -s <path>/libncurses.so.5.6 <path>/libtinfo.so.5

As <path>, use the location of the system's ncurses library.

Safely ending offload debug sessions

To avoid issues like orphan processes or stale debugger windows when ending offload applications, manually end the debugging session before the application is reaching its exit code. The following procedure is recommended for terminating a debug session:
  1. Manually stop a debug session before the application reaches the exit-code.
  2. When stopped, press the red stop button in the tool-bar in the Intel® MIC Architecture-side debugger first. This will end the offloaded part of the application.
  3. Next, do the same for the CPU-side debugger.
  4. The link between the two debuggers will be kept alive. The Intel® MIC Architecture-side debugger will stay connected to the debug agent and the application will remain loaded in the CPU-side debugger, including all breakpoints that have been set.
  5. At this point, both debugger windows can safely be closed.

Intel® MIC Architecture-side debugger asserts on setting source directories

Setting source directories in the GNU* GDB might lead to an assertion.
Resolution:
The assertion should not affect debugger operation. To avoid the assertion anyway, don’t use source directory settings. The debugger will prompt you to browse for files it cannot locate automatically.
 

Debugger and debugged application required to be located on local drive (OS X*/macOS* only)

In order to use the provided GNU* GDB (gdb-ia), it has to be installed on a local drive. As such, the entire Intel® Parallel Studio XE 2018 package has to be installed locally. Any application that is being debugged needs to be located on a local drive as well. This is a general requirement that’s inherent to GNU GDB with OS X*/macOS*.
 

Debugging Fortran applications with Eclipse* IDE plugin for Intel® Xeon Phi™ coprocessor

If the Eclipse* IDE plugin for the Intel® Xeon Phi™ coprocessor is used for debugging Fortran applications, evaluation of arrays in the locals window might be incorrect. The underlying CDT applies the C/C++ syntax with brackets to arrays to retrieve their contents. This does not work for Fortran.
Solution: Use a fully qualified Fortran expression to retrieve the contents of arrays (e.g. with array sections like  array(1:10)).
 
 
This section summarizes new features and changes, usage and known issues related to the Intel® Debugger Extension. This debugger extension only supports code targeting Intel® Many Integrated Core Architecture (Intel® MIC Architecture).
 

Features

  • Support for both native Intel® Xeon Phi™ coprocessor applications and host applications with offload extensions
  • Debug multiple Intel® Xeon Phi™ coprocessors at the same time (with offload extension)

Using the Intel® Debugger Extension

The Intel® Debugger Extension is a plug-in for the Microsoft Visual Studio* IDE. It transparently enables debugging of projects defined by  that IDE. Applications for Intel® Xeon Phi™ coprocessors can be either loaded and executed or attached to. This extension supports debugging of offload enabled code, using:
  • Microsoft Visual Studio* 2013
  • Microsoft Visual Studio* 2015
  • Microsoft Visual Studio* 2017

Documentation

The full documentation for the Intel® Debugger Extension can be found here:
<install-dir>\documentation_2018\en\debugger\ps2018\get_started.htm

This is available online as well:

Known Issues and Limitations

  • Disassembly window cannot be scrolled outside of 1024 bytes from the starting address within an offload section.
  • Handling of exceptions from the Intel® MIC Architecture application is not supported.
  • Starting an Intel® MIC Architecture native application is not supported. You can attach to a currently running application, though.
  • The Thread Window in Microsoft Visual Studio* offers context menu actions to Freeze, Thaw and Rename threads. These context menu actions are not functional when the thread is on an Intel® Xeon Phi™ coprocessor.
  • Setting a breakpoint right before an offload section sets a breakpoint at the first statement of the offload section. This only is true if there is no statement for the host between set breakpoint and offload section. This is normal Microsoft Visual Studio* breakpoint behavior but might become more visible with interweaved code from host and Intel® Xeon Phi™ coprocessor. The superfluous breakpoint for the offload section can be manually disabled (or removed) if desired.
  • Only Intel® 64 applications containing offload sections can be debugged with the Intel® Debugger Extension for Intel® Many Integrated Core Architecture.
  • Stepping out of an offload section does not step back into the host code. It rather continues execution without stopping (unless another event occurs). This is intended behavior.
  • The functionality “Set Next Statement” is not working within an offload section.
  • If breakpoints have been set for an offload section in a project already, starting the debugger might show bound breakpoints without addresses. Those do not have an impact on functionality.
  • For offload sections, using breakpoints with the following conditions of hit counts do not work: “break when the hit count is equal to” and “break when the hit count is a multiple of”.
  • The following options in the Disassembly window do not work within offload sections: “Show Line Numbers”, “Show Symbol Names” and “Show Source Code”
  • Evaluating variables declared outside the offload section shows wrong values.
  • Please consult the Output (Debug) window for detailed reporting. It will name unimplemented features (see above) or provide additional information required to configuration problems in a debugging session. You can open the window in Microsoft Visual Studio* via menu Debug->Windows->Output.
  • When debugging an offload-enabled application and a variable assignment is entered in the Immediate Window, the debugger may hang if assignments read memory locations before writing to them (for example, x=x+1). Please do not use the Immediate Window for changing variable values for offload-enabled applications.
  • Depending on the debugger extensions provided by Intel, the behavior (for example, run control) and output (for example, disassembly) could differ from what is experienced with the Microsoft Visual Studio* debugger. This is because of the different debugging technologies implemented by each and should not have a significant impact to the debugging experience.

Fortran Expression Evaluator (FEE) for debugging Fortran applications with Microsoft Visual Studio*

Fortran Expression Evaluator (FEE) is a plug-in for Microsoft Visual Studio* that is installed with Intel® Visual Fortran Compiler. It extends the standard debugger in Microsoft Visual Studio* IDE by handling Fortran expressions. There is no other change in usability.

Known Issues and Limitations

Conditional breakpoints limited

Conditional breakpoints that contain expressions with allocatable variables are not supported for Microsoft Visual Studio 2012* or later.

Debugging mixed language programs with Fortran does not work

To enable debugging Fortran code called from a .NET managed code application in Visual Studio 2012 or later, unset the following configuration:
Menu Tools->Options, under section Debugging->General, clear the "Managed C++ Compatibility Mode" or "Use Managed Compatibility Mode" check box

For any managed code application, one must also check the project property Debug > Enable unmanaged code debugging.

Native edit and continue

With Microsoft Visual Studio 2015*, Fortran debugging of mixed code applications is enabled if "native edit and continue" is enabled for the C/C++ part of the code. In earlier versions this is not supported.

FEE truncates entries in locals window

To increase debugging performance, the maximum number of locals queried by the debug engine is limited with Intel® Parallel Studio XE 2016 and later releases. If a location in the source code has more than that number of locals, they are truncated and a note is shown:

Note: Too many locals! For performance reasons the list got cut after 500 entries!

The threshold can be controlled via the environment variable FEE_MAX_LOCALS. Specify a positive value for the new threshold (default is 500). A value of -1 can be used to turn off truncation entirely (restores previous behavior) - but at the cost of slower debug state transitions. In order to take effect, Microsoft Visual Studio* needs to be restarted.

Problem with debugging C# applications

If Microsoft Visual Studio 2015* is used, debugging of C# applications might cause problems, i.e. evaluations like watches won't work.If you experience issues like that, try to enable "Managed Compatibility Mode". More details how to enable it can be found here:
http://blogs.msdn.com/b/visualstudioalm/archive/2013/10/16/switching-to-managed-compatibility-mode-in-visual-studio-2013.aspx

The problem is known and will be fixed with a future version.

Attributions

This product includes software developed at:

GDB – The GNU* Project Debugger

Copyright Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

This program is free software; you can redistribute it and/or modify it under the terms and conditions of the GNU General Public License, version 2, as published by the Free Software Foundation.

This program is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

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You may also lend copies, under the same conditions stated above, and you may publicly display copies.

 

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4. MODIFICATIONS

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9. TERMINATION

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10. FUTURE REVISIONS OF THIS LICENSE

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11. RELICENSING

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"CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 license published by Creative Commons Corporation, a not-for-profit corporation with a principal place of business in San Francisco, California, as well as future copyleft versions of that license published by that same organization.

"Incorporate" means to publish or republish a Document, in whole or in part, as part of another Document.

An MMC is "eligible for relicensing" if it is licensed under this License, and if all works that were first published under this License somewhere other than this MMC, and subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or invariant sections, and (2) were thus incorporated prior to November 1, 2008.

The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA on the same site at any time before August 1, 2009, provided the MMC is eligible for relicensing.

 

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