Re: ParNew and caching

2011-12-10 Thread Edward Capriolo
I am not sure if there is a ticket on this but I have always thought the row cache should not bother caching an entry bigger then n columns. Murmurs of a slice cache might help as well. On Saturday, December 10, 2011, Peter Schuller wrote: >> After re-reading my post, what I meant to say is that

Re: ParNew and caching

2011-12-10 Thread Peter Schuller
> After re-reading my post, what I meant to say is that I switched from > Serializing cache provider to ConcurrentLinkedHash cache provider and then > saw better performance, but still far worse than no caching at all: > > - no caching at all : 25-30ms > - with Serializing provider : 1300+ms > - wi

Re: ParNew and caching

2011-11-18 Thread Mohit Anchlia
2011/11/18 Todd Burruss : > After re-reading my post, what I meant to say is that I switched from > Serializing cache provider to ConcurrentLinkedHash cache provider and then > saw better performance, but still far worse than no caching at all: > > - no caching at all : 25-30ms > - with Serializing

Re: ParNew and caching

2011-11-18 Thread Jonathan Ellis
No i/o? No sstable counts going up in cfhistograms? Is the heap so full you're experiencing GC pressure that way? On Fri, Nov 18, 2011 at 3:46 PM, Todd Burruss wrote: > Ok, I figured something like that.  Switching to > ConcurrentLinkedHashCacheProvider I see it is a lot better, but still > ins

Re: ParNew and caching

2011-11-18 Thread Todd Burruss
After re-reading my post, what I meant to say is that I switched from Serializing cache provider to ConcurrentLinkedHash cache provider and then saw better performance, but still far worse than no caching at all: - no caching at all : 25-30ms - with Serializing provider : 1300+ms - with Concurrent

Re: ParNew and caching

2011-11-18 Thread Mohit Anchlia
On Fri, Nov 18, 2011 at 1:46 PM, Todd Burruss wrote: > Ok, I figured something like that.  Switching to > ConcurrentLinkedHashCacheProvider I see it is a lot better, but still > instead of the 25-30ms response times I enjoyed with no caching, I'm > seeing 500ms at 100% hit rate on the cache.  No o

Re: ParNew and caching

2011-11-18 Thread Todd Burruss
Ok, I figured something like that. Switching to ConcurrentLinkedHashCacheProvider I see it is a lot better, but still instead of the 25-30ms response times I enjoyed with no caching, I'm seeing 500ms at 100% hit rate on the cache. No old gen pressure at all, just ParNew crazy. More info on my us

Re: ParNew and caching

2011-11-18 Thread Mohit Anchlia
On Fri, Nov 18, 2011 at 9:42 AM, Sylvain Lebresne wrote: > On Fri, Nov 18, 2011 at 6:31 PM, Mohit Anchlia wrote: >> On Fri, Nov 18, 2011 at 7:47 AM, Sylvain Lebresne >> wrote: >>> On Fri, Nov 18, 2011 at 4:23 PM, Mohit Anchlia >>> wrote: On Fri, Nov 18, 2011 at 6:39 AM, Sylvain Lebresne

Re: ParNew and caching

2011-11-18 Thread Sylvain Lebresne
On Fri, Nov 18, 2011 at 6:31 PM, Mohit Anchlia wrote: > On Fri, Nov 18, 2011 at 7:47 AM, Sylvain Lebresne > wrote: >> On Fri, Nov 18, 2011 at 4:23 PM, Mohit Anchlia >> wrote: >>> On Fri, Nov 18, 2011 at 6:39 AM, Sylvain Lebresne >>> wrote: On Fri, Nov 18, 2011 at 1:53 AM, Todd Burruss

Re: ParNew and caching

2011-11-18 Thread Mohit Anchlia
On Fri, Nov 18, 2011 at 7:47 AM, Sylvain Lebresne wrote: > On Fri, Nov 18, 2011 at 4:23 PM, Mohit Anchlia wrote: >> On Fri, Nov 18, 2011 at 6:39 AM, Sylvain Lebresne >> wrote: >>> On Fri, Nov 18, 2011 at 1:53 AM, Todd Burruss wrote: I'm using cassandra 1.0.  Been doing some testing on usi

Re: ParNew and caching

2011-11-18 Thread Sylvain Lebresne
On Fri, Nov 18, 2011 at 4:23 PM, Mohit Anchlia wrote: > On Fri, Nov 18, 2011 at 6:39 AM, Sylvain Lebresne > wrote: >> On Fri, Nov 18, 2011 at 1:53 AM, Todd Burruss wrote: >>> I'm using cassandra 1.0.  Been doing some testing on using cass's cache. >>>  When I turn it on (using the CLI) I see Pa

Re: ParNew and caching

2011-11-18 Thread Mohit Anchlia
On Fri, Nov 18, 2011 at 6:39 AM, Sylvain Lebresne wrote: > On Fri, Nov 18, 2011 at 1:53 AM, Todd Burruss wrote: >> I'm using cassandra 1.0.  Been doing some testing on using cass's cache. >>  When I turn it on (using the CLI) I see ParNew jump from 3-4ms to >> 200-300ms.  This really screws with

Re: ParNew and caching

2011-11-18 Thread Sylvain Lebresne
On Fri, Nov 18, 2011 at 1:53 AM, Todd Burruss wrote: > I'm using cassandra 1.0.  Been doing some testing on using cass's cache. >  When I turn it on (using the CLI) I see ParNew jump from 3-4ms to > 200-300ms.  This really screws with response times, which jump from ~25-30ms > to 1300+ms.  I've in

ParNew and caching

2011-11-17 Thread Todd Burruss
I'm using cassandra 1.0. Been doing some testing on using cass's cache. When I turn it on (using the CLI) I see ParNew jump from 3-4ms to 200-300ms. This really screws with response times, which jump from ~25-30ms to 1300+ms. I've increase new gen and that helps, but still this is suprising