By: Bill Buros.
The Linux Performance customer profiling utility (lpcpu) has been updated with some enhancements and clarifications for easier use. The package is available for download here . The package is designed to capture performance information for analysis in one script invocation, gathering the profiler and system information into a packaged tarball. The modifications in this update include: Add capture of sysctl.conf to see explicit modifications of sysctl values Update script termination processes to not create an... [More]
By: Bill Buros.
An interesting new User Group is launching in Austin Tx this spring. Ben Collins provides an introduction over on Linux.com for the "founding meeting" coming up in March 2013. Looking forward to seeing more of what's happening around the broader arena of POWER processors and specifically with Linux. "The PLUG's founding meeting aims to bring together some of the top companies, developers and users to a common place to see, touch and discuss the future of Power platforms. By bringing... [More]
By: Bill Buros.
Across developerWorks, there are a number of related communities, blogs, and individuals focusing on technologies making things easier and simpler for customers. The most recent example is a blog which focuses on notes from the IBM Systems Electronic Support team. The team posted an entry on the YUM! Tools for PowerLinux servers - which nicely explains some of the background work that goes on with offerings like this. Check it out! There's some interesting news about work in progress and what to look... [More]
By: Breno Leitão.
This tutorial explains how to create a RAID device on PowerLinux machines using an array of disks. This step by step tutorial includes identifying the disks, formatting them, combining them in a RAID array, creating a partition and, finally, creating a file system on this partition.
The PowerLinux machines support a RAID (Redundant Array of Independent Disks) card. A RAID card is a device that combines a set of physical disks into a logical... [More]
By: Timothy Noonan. Recently, Red Hat announced that Red Hat Enterprise Linux 6 conforms with the USGv6 Host profile. See Red Hat Ready to Serve U.S. Government with IPv6 Conformity . Likewise, we can assert that IBM POWER7 Systems™, as well as SUSE Linux Enterprise Server 11, have met the National Institute of Standards and Technology’s USGv6 evaluation requirements. Why is this important? U.S. government agencies are migrating to Internet Protocol Version 6 (IPv6), as the pool of IPv4 addresses is being depleted. The move to IPv6 also... [More]
By: Wainer dos Santos Moschetta . Overview The Linux Trace Toolkit Next Generation (LTTng) is a toolkit for trace and visualization of events produced by both the Linux kernel and applications (user-space). Version 2.x offers several improvements in relation to previous 1.x series, including: Introduction of a new trace file format called CTF(Common Trace Format) Beyond default kernel events, it allows trace of user-space applications New implementation of ring buffer algorithm Able to attach context information to events
By: Jessica Erber-Stark. Mel Beckman at PowerITPro recently published a very nice overview of IBM PowerLinux systems. Mel states: "IBM’s PowerLinux
brings big-iron reliability and scalability to Linux while still
providing cost-competitive, Linux-friendly, entry-level server
offerings." Check out the article " PowerLinux Pumps Up Linux Apps " on PowerITPro to get Mel's take on: Application portability to PowerLinux systems Virtualization performance advantages PowerLinux 7R2 system summary Big Data Analytics... [More]
By: Jenifer Hopper, working closely with zswap developer: Seth Jennings Updates: Results for the new POWER7+ compression accelerator are provided inline A related article by Seth available on LWN.net: The zswap compressed swap cache With a short article here, we introduce some good work going on in the Linux community for memory compression techniques on a Linux system. A new proposed framework called " zswap " is discussed, with some initial performance data provided to demonstrate the potential benefits for a system... [More]
By: Bill Buros.
In November 2012, IBM launched a new POWER7+ enabled IBM Flex System p260 compute node. For the marketing and system details, see the IBM PureFlex Systems page . Here on the technical community, we wanted to take a minute to reference the "formal benchmark publishes" that are run and submitted to organizations like SPEC.org. Performance proof points like published benchmarks are a great way to keep score of performance improvements, not only with the hardware systems, but as in our case, the software... [More]
By: Bill Buros.
A new IBM Redbooks publication is now available which provides great advice on optimizing application codes for POWER7 and POWER7+ systems POWER7 and POWER7+ Optimization and Tuning Guide Chapter 1. Optimization and tuning on IBM POWER7 and IBM POWER7+ Chapter 2. The POWER7 processor Chapter 3. The POWER Hypervisor Chapter 4. AIX Chapter 5. Linux Chapter 6. Compilers and optimization tools for C, C++, and Fortran Chapter 7. Java Chapter 8. DB2 Chapter 9. WebSphere Application Server Appendix A. Analyzing malloc... [More]
By: Carlos Seo. The IBM Advance Toolchain for PowerLinux is a set of open source
development tools and runtime libraries that allow users to take leading
edge advantage of IBM's latest POWER hardware features on Linux. A new
update release is now available, and it includes the following:
Time zone automatically set to system's time zone. New advance-toolchain-at6.0-selinux rpm, which sets the correct labels for key files so the Advance Toolchain works when SELinux is enabled. New ldconfig wrapper (installed in /usr/sbin/) that wraps... [More]
By: Aravinda Prasad. Problem determination is
definitely a key area when it comes to systems administrators
(sysadmins). Sysadmins tend to spend hours debugging and trying to
find out what is wrong with the system. Engineers at the IBM Linux
Technology Center around the world are working on ways to simplify the
experience of sysadmins in managing IBM systems. An outcome of such
an effort is the upcoming facilities like Light Path Diagnostics,
improved diagnostic tools and other features in IBM PowerLinux, which
integrates well with the... [More]
By: Mahesh Salgaonkar. Any Enterprise deployment needs facilities to trace, record, and analyze system state for serviceability. We would ideally want to capture all relevant information to debug a problem at the first occurrence of the problem. In IBM parlance, we call this First Failure Data Capture (FFDC). While FFDC is important for all components of the system, it is critical for the operating system (OS) which is the heart of the running software. Gathering the state of the OS at the time of a crash/hang is the first step to finding out... [More]
by: Kleber Sacilotto de Souza The default iptables rules that come with most of the Enterprise Linux distributions (e.g. RHEL and SLES) prevent multicast IP packets from reaching client applications that have joined multicast groups. This article will explain how to configure or disable iptables so client multicast applications can receive multicast packets. Disabling iptables If your multicast client system doesn't need to be protected by a firewall the easiest way to make a multicast application to work is by disabling iptables or any... [More]
By: Fabio Dassan dos Santos The IBM Installation Toolkit for PowerLinux goes beyond just trying to speed-up your typical Linux installation, by also delivering an interesting set of tools around system update and recovery. One of the new and noteworthy features for this 5.3 release, the LPAR Cloning and Restoration tool , focuses on extending value in this category by providing a quick and easy way of creating re-usable system images across LPARs. Through very few steps, it is possible to achieve the following with this new tool: Save... [More]
By: Anibal Carvalho . One of the
main new features of IBM® Installation Toolkit for PowerLinux version
5.3 is the support for facilitating Linux installations, on top of multipath devices. Multipath I/O Linux layers can be enabled on IBM PowerLinux servers with multiple physical paths to storage devices (through SANs or direct attached), where they can be used to increase storage path redundancy, as well as to enhance server performance though typical features, such as: Dynamic load balancing Traffic shaping Automatic path management... [More]
By: Ricardo M. Matinata. About IBM Installation Toolkit for PowerLinux version 5.3 The IBM® Installation Toolkit for PowerLinux is an optional tool that speeds up the installation of Linux, and gives you access to the IBM value-added software necessary to fully use the capabilities of the Power® platform. You can use the IBM Installation Toolkit on PowerLinux servers, including IBM PowerLinux™ and IBM Power Systems™ servers running Linux. New in IBM Installation Toolkit version 5.3: Support for installing Linux on multipath devices... [More]
By: Beth Taylor and Walt Madden. Several previous blog posts have told of the
advantages of IBM ®
Advance Toolchain for PowerLinux for application performance analysis on IBM
Power Systems ™
servers. Likewise, you've heard about
IBM Software Development Kit for PowerLinux ™ , which combines C/C++ source
development with the Advance Toolchain and classic Linux debugging and
performance analysis tools like OProfile. Recently, the IBM InfoSphere Streams development
team has had the positive experience to give credit to these claims... [More]
By: Bill Buros. Within the Linux open-source community, and across the Power systems, there are a number of new, emerging, and in some cases maturing technologies actively being worked on, prototyped, and prepared for enterprise-class deployment. Members of the IBM Linux Technology Center around the world are involved with these projects, collaborating with peers across the open-source community. Over the coming weeks and rolling into next year, here on the PowerLinux Technical Community we plan to begin highlighting these technologies in... [More]
By: Wainer dos Santos Moschetta. As of Version 1.2, the IBM SDK for PowerLinux comes with IBM Java 6 SDK required to run the Eclipse instance. Users sometimes ask me how they can change JVM (Java Virtual Machine) parameters according to their specific needs (e.g. increase jvm heap size due to big projects being imported into the SDK). Here is an answer: The JVM parameters are defined in the following file where any options under -vmargs will be passed to the JVM. /opt/ibm/ibm-sdk-lop/sdk_launcher.ini Here is an example of... [More]