Astronomy

A new open-source application lets professional and amateur astronomers explore space from their We've been fascinated by astronomy since the ancient Chinese first charted the skies. The computerization of astronomy, some would argue, is its greatest leap forward yet. Today, unattended robotic telescopes scan skies that have been charted over centuries, recording their findings in modern databases. CCD cameras capture images impossible to define on film. It's an exciting time to be an...

With Bx Pro you get

WYSIWYG Visual Development Environment Optimized Environment for C C++ Development Copyright 2002 Integrated Computer Solutions, Inc. All rights reserved, all trademarks are the property of their respective companies. Now that we have a key, we can use it to sign a kernel module. To sign a module, use the sign script, which is a simple shell script strip out only the sections that we care about . mod module module.out sha1sum module.out awk print 1 > module.sha1 gpg --no-greeting -e -o - -r...

Signed Kernel Modules

Now you can make the kernel check modules for a cryptographic signature before inserting them. Here's the detail of how it's done. Signed kernel modules have been a feature of other operating systems for a number of years. Some people and companies like the idea of installing only modules (or drivers, as they are sometimes called) that are known to be blessed by some authority in their operating systems. Given the changes in how Linux loads kernel modules, signed kernel modules easily can be...

Scaling dcache with RCU

Reorganizing the way Linux caches filename lookups is a big win for helping to scale to large servers. by paul e. mckenney, dipankar RCU read-copy update , a synchronization technique optimized for read-mostly data structures, recently was added to the Linux 2.6 kernel. This article describes how RCU improved the scalability of Linux's directory-entry cache dcache . For some more background, see Using RCU in the Linux 2.5 Kernel, in the October 2003 issue of Linux Journal. Linux's dcache...

Start configuring your companys high performance supercomputlng solution now by visiting Rack Saver online at

All Rights Reserved. RackSaver, the RackSaver logo, BladeRack, and NemeSys are trademarks or registered trademarks of RackSaver Inc. Intel and Xeon and combinations thereof are trademarks of Intel Corporation or its subsidiaries in the United States or other countries. 0 20 40 60 80 100 120 140 Number of Users Figure 9. Multiuser Benchmark Performance Performance and Complexity Comparisons Although this change in dcache was relatively small, it had far-reaching...