Re: Scaled down a bit.

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On Wed, 28 Nov 2007, Kevan Benson wrote:

     Ok, better.  Does work on the client side though.  Doesn't seem
to be to great on the server side for some reason.

     I just tried my simple test with readahead on the cl;ient side.
No difference.  Here's what I used.

volume readahead
  type performance/read-ahead
  option page-size 128kb ### in bytes
  option page-count 2 ### memory cache size is page-count x page-size per file
  subvolumes client
end-volume
~ Maybe the page size or count needs to be bigger?

Krishna Srinivas wrote:
On Nov 28, 2007 11:11 PM, Chris Johnson <johnson@xxxxxxxxxxxxxxxxxxx> wrote:
On Wed, 28 Nov 2007, Kevan Benson wrote:
Chris Johnson wrote:
     I also tried the io-cache on the client side.  MAN does that
work.  I had a 256 MB cache defind.  A reread of my 24 MB file took 72
MS.  I don't think it even bothered with the server much.  I need to
try that on the server.  Might help if a bunch of computer nodes
hammer on the same file at the same time.
Careful with io-cache and io-threads together, depending on where you define it (I think), the cache is per-thread. so if you have 8 threads and a 256 MB
cache defined, be prepared for 2 GB of cache use...


No, If you define one io-cache translator there is only one cache. All the
threads will refer to the same io-cache translator with which it is associated

Ah. Is this newer? I thought I tried this a few months ago and saw a lot of memory usage. Maybe I just ASSumed. ;)

--

-Kevan Benson
-A-1 Networks




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