Can processor cores thrash each other's caches?

Posted by Jørgen Fogh on Stack Overflow See other posts from Stack Overflow or by Jørgen Fogh
Published on 2010-05-23T22:31:43Z Indexed on 2010/05/23 22:41 UTC
Read the original article Hit count: 254

Filed under:

cache

|

multicore

|

shared-memory

If more than one core on a processor is accessing the same memory address, will they thrash each other's caches or will some snooping protocol allow each to keep the data in L1-cache?

I am interested in a general answer as well as answers for specific processors. How many layers of cache are invalidated? Will accessing another address within the same cache-line invalidate the entire line? What can you do to alleviate these problems?

© Stack Overflow or respective owner

Related posts about cache

How to remove a package entirely?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
Hi I'm quite new to Linux, but before using it I was hearing that Windows programs, after uninstallation, leaves a lot of remains on the hard disc, and Linux removes all. I'm using Ubuntu 10.04. To uninstall packages I'm using sudo apt-get autoremove application_name or sudo aptitude purge application_name… >>> More
LVM / Device Mapper maps wrong device

as seen on Server Fault - Search for 'Server Fault'
Hi, I run a LVM setup on a raid1 created by mdadm. md2 is based on sda6 (major:minor 8:6) and sdb6 (8:22). md2 is partition 9:2. The VG on top of md2 has 4 LVs, var, home, usr, tmp. First the problem: While booting it seems as if the device mapper takes the wrong partition for the mapping! Immediately… >>> More
Application throws NotSerializableException when run on an jboss cluster

as seen on Stack Overflow - Search for 'Stack Overflow'
Environment: JBoss 5.1.0, JBoss Seam 2.2.0 While trying to get my application running in a clustered environment after login I am getting the following exception. Post login we try to store the currentUser in jboss seam session context. java.io.NotSerializableException: org.jboss.seam.util.AnnotatedBeanProperty How… >>> More
Windows Azure Evolution – Caching (Preview)

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Caching is a popular topic when we are building a high performance and high scalable system not only on top of the cloud platform but the on-premise environment as well. On March 2011 the Windows Azure AppFabric Caching had been production launched. It provides an in-memory, distributed caching service… >>> More
Locking Cache Key without Locking the entire Cache

as seen on Stack Overflow - Search for 'Stack Overflow'
I have servlets that caches user information rather then retrieving it from the user store on every request (shared Ehcache). The issue I have is that if a client is multi-threaded and they make more then one simultaneous request, before they have been authenticated, then I get this in my log: Retrieving… >>> More

Related posts about multicore

Multicore Chips Require OS Rework, Windows Architect Advises

as seen on Devx - Search for 'Devx'
Microsoft's Dave Probert says the OS kernel needs to act more like a hypervisor. >>> More
Multicore Chips Require OS Rework, Windows Architect Advises

as seen on Internet.com - Search for 'Internet.com'
Microsoft's Dave Probert says the OS kernel needs to act more like a hypervisor. >>> More
Ct Technology: A Flexible Parallel Programming Model for Multicore and Many-Core Architectures

as seen on Dr Dobbs - Search for 'Dr Dobbs'
Ct leverages the strengths of data parallel programming to help address challenges of software development for multicore and many-core Parallel computing - Multi-core processor - Programming - Microsoft - Languages >>> More
A Real-Time HPC Approach for Optimizing Multicore Architectures

as seen on Dr Dobbs - Search for 'Dr Dobbs'
Complex math is at the heart of many of the biggest technical challenges. With multicore processors, the type of calculations that would have required a supercomputer can now be performed in real-time, embedded environments. High-performance computing - Supercomputer - Real-time computing - Operating… >>> More
How are you taking advantage of Multicore?

as seen on Stack Overflow - Search for 'Stack Overflow'
As someone in the world of HPC who came from the world of enterprise web development, I'm always curious to see how developers back in the "real world" are taking advantage of parallel computing. This is much more relevant now that all chips are going multicore, and it'll be even more relevant when… >>> More