The lockless page cache

Posted Jul 31, 2008 15:31 UTC (Thu) by intgr (subscriber, #39733)
Parent article: The lockless page cache

Do these changes have a measurable speed gain with practical workloads on dual-core or
quad-core processors? The only benchmark I found was a synthetic benchmark from April 2006 by
Jens Axboe. The patch has probably been turned inside out since then.

The lockless page cache

Posted Aug 3, 2008 0:00 UTC (Sun) by Nick (guest, #15060) [Link] (1 responses)

I would be surprised if there was anything too noticeable for desktop types of workloads,
however 
the nice thing about these patches is that they actually speed up single threaded performance
as 
well as improve scalability.

Here is my justification to have them merged, which includes some numbers:
http://lwn.net/Articles/285339/

For server workloads using threads and direct IO, there should be some improvement at even 2
or 4 
cores. The OLTP database workload that gained nearly 10% throughput was run on a 2s/8c system,

so a 4 core system should see a few %.

Performance booster ?

Posted Oct 15, 2008 5:50 UTC (Wed) by RTT (guest, #54698) [Link]

What if instead there were multiple page files for each core.

And plus, what if each of those page file is on a separate SAS hard disk ?