On Fri, Jul 23, 2010 at 8:47 AM, dormando dorma...@rydia.net wrote:
I tried.
Try the engine branch?
I guess, I'll have to at some point.
Just wanted to say, that LRU was designed as an algorithm for a uniform cost
model, where all elements are almost equally important (have
Thanks for an explanation.
I see that we have entirely different points of view, probably caused by
totally different identified sets of bottlenecks, different usage, different
configurations etc (I assume that you have greater experience, since my is
restricted to one company, with just 55
On Sun, 25 Jul 2010, Jakub Łopuszański wrote:
Thanks for an explanation.
I see that we have entirely different points of view, probably caused by
totally different identified sets of bottlenecks, different
usage, different configurations etc (I assume that you have greater
experience,
While I agree with most of your thesis, I can't see how GC is against the
LRU.
I agree, that often accessed keys with short TTL seem strange, and so do
rarely accessed keys with long TTL. But there are lots of perfect reasons to
have such situation, and we do.
GC does not work against the LRU (at
I tried.
Try the engine branch?
On Fri, 23 Jul 2010, Jakub Łopuszański wrote:
While I agree with most of your thesis, I can't see how GC is against the LRU.
I agree, that often accessed keys with short TTL seem strange, and so do
rarely accessed keys with long TTL. But there are lots of
On Fri, Jul 23, 2010 at 8:47 AM, dormando dorma...@rydia.net wrote:
I tried.
Try the engine branch?
I guess, I'll have to at some point.
Just wanted to say, that LRU was designed as an algorithm for a uniform cost
model, where all elements are almost equally important (have the same cost
of
: Re: Using PCIe SSDs instead of RAM
On Fri, Jul 23, 2010 at 8:47 AM, dormando dorma...@rydia.net wrote:
I tried.
Try the engine branch?
I guess, I'll have to at some point.
Just wanted to say, that LRU was designed as an algorithm for a uniform cost
model, where all elements are almost
On Jul 23, 11:31 am, Ben Manes ben_ma...@yahoo.com wrote:
There are alternatives to LRU, which is generally chosen for being extremely
simple to implement, fast, and has a reasonable hit rate. The
Greedy-Dual-Size-Frequency policy may be more appropriate for memcached as it
accounts a value's
I see that my patch for garbage collection is still being ignored, and your
post gives me some idea about why it is so.
I think that RAM is a real problem, because currently (without GC) you have
no clue about how much RAM you really need. So you can end up blindly buying
more and more machines,
On 7/22/10 5:46 AM, Jakub Łopuszański wrote:
I see that my patch for garbage collection is still being ignored, and
your post gives me some idea about why it is so.
I think that RAM is a real problem, because currently (without GC) you
have no clue about how much RAM you really need. So you can
Well, I beg to differ.
We used to have evictions 0, actually around 200 (per whatever munin
counts them), so we used to think, that we have too small number of
machines, and kept adding them.
After using the patch, the memory usage dropped by 80%, and we have no
evictions since a long time, which
On 7/22/10 2:02 PM, Jakub Łopuszański wrote:
Well, I beg to differ.
We used to have evictions 0, actually around 200 (per whatever munin
counts them), so we used to think, that we have too small number of
machines, and kept adding them.
After using the patch, the memory usage dropped by 80%,
http://code.google.com/p/memcached/wiki/NewServerMaint#Looks_Can_be_Deceiving
Think I'll write a separate page about managing memory, based off of the
slides from my mysqlconf presentation about monitoring memcached...
We're not ignoring you, the patch is against what the LRU is designed for.
increasing every year.
When I thought of using PCIe SSDs instead of RAM I wasn't doing this
with regard to persistence of objects. I just noticed, that the Fusion-
io's ioDrives are working with near-RAM speed, having the PCIe bus as
the only bottleneck in speed (don't mix it up with SATA SSDs
access to RAM. But RAM is still very expensive - even with the amount
of RAM you get for the same money increasing every year.
When I thought of using PCIe SSDs instead of RAM I wasn't doing this
with regard to persistence of objects. I just noticed, that the Fusion-
io's ioDrives are working
Hello,
I know that memcached is designed to get its speed from the fast
access to RAM. But RAM is still very expensive - even with the amount
of RAM you get for the same money increasing every year.
When I thought of using PCIe SSDs instead of RAM I wasn't doing this
with regard to persistence
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