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Using Read-Copy-Update Techniques for System V IPC in the Linux 2.5 Kernel

Read-Copy Update RCU allows lock-free read-only access to data structures that are concurrently modified on SMP systems. Despite the concurrent modifications, read-only access requires neither locks nor atomic instructions, and can often be written as if the data were unchanging, in a "CS 101" style. RCU is typically applied to...

Tags: Implementation, Kernel, IBM Corp., RCU, Linux, UNIX, Operating Systems, Open Source, Software

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Making RCU Safe for Deep Sub-Millisecond Response Realtime Applications

Linux has long been used for soft realtime applications. More recent work is preparing Linux for more aggressive realtime use, with scheduling latencies in the small number of hundreds of microseconds (that is right, microseconds, not milliseconds). The current Linux 2.6 RCU implementation both helps and hurts. It helps by...

Tags: Latency, Linux, UNIX, Open Source, Operating Systems, Software

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RCU Vs. Locking Performance on Different CPUs

This paper fills the gap of comparing RCU to other locking techniques on a number of CPUs using a hash-lookup micro-benchmark. The read intensity, number of the CPUs, and number of searches/updates per grace period are varied to gain better insight into which tool is right for a particular job.

Tags: Performance, CPU, IBM Corp., Processors, Semiconductors, Hardware, Components

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SCO seeks to buttress case against Big Blue

Stay on top of the latest tech news with our free IT News Digest e-newsletter, delivered each weekday. Automatically sign up today!By ...

Tags: OPEN SOURCE, Operating systems, summary judgment, SCO Group Inc., Linux, AutoZone Inc., IBM Corp., Unix

Technical articles 2004-07-16