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From Kant Kodali <k...@peernova.com>
Subject Re: Java GC pauses, reality check
Date Mon, 28 Nov 2016 15:47:33 GMT
@Harikrishnan Pillai

Thanks for that. What about the following?


"We are using g1GC in most clusters with *26GB heap* and extra threads
given to parallel and old gen collection. Those clusters 99% is also under
5 ms and doing good".

*So with G1GC you are able get under 5ms not the C4 (Zing's Garbage
Collector?)*

*What timeouts are you referring to ?*

On Mon, Nov 28, 2016 at 7:39 AM, Harikrishnan Pillai <
HPillai@walmartlabs.com> wrote:

> Hi @Kant Kodali,
>
> 11 /11 , 11 nodes in DC1 and 11 nodes in DC2.
>
>
> ------------------------------
> *From:* Kant Kodali <kant@peernova.com>
> *Sent:* Monday, November 28, 2016 6:56 AM
>
> *To:* user@cassandra.apache.org
> *Subject:* Re: Java GC pauses, reality check
>
> Hi Hari,
>
> I am a little bit confused.
>
> What you mean 11/11 ?
>
> "We are using g1GC in most clusters with *26GB heap* and extra threads
> given to parallel and old gen collection. Those clusters 99% is also under
> 5 ms and doing good". So with G1GC you are able get under 5ms not the C4
> (Zing's Garbage Collector?)
>
> What timeouts are you referring to here?
>
> Thanks,
> kant
>
> On Sun, Nov 27, 2016 at 9:57 PM, Harikrishnan Pillai <
> HPillai@walmartlabs.com> wrote:
>
>> Hi @Kant Kodali,
>>
>> We have multiple clusters running zing .
>>
>> One cluster has 11/11 and another one also has 11/11.(190 GB mem,6TB hard
>> disk and 16 Physical core machines)
>>
>> The average read size is around 200KB and it can go upto 6 MB.
>>
>> We are using g1GC in most clusters with *26GB heap* and extra threads
>> given to parallel and old gen collection. Those clusters 99% is also under
>> 5 ms and doing good. We used Zing to remove all timeouts . If application
>> is not having that requirement G1GC is good.
>>
>> with g1gGC i have seen average 200-300 ms min pauses every 4 minutes and
>> 600 ms pauses every 6 hours and 99% latency is under 5-10 ms for most of
>> the clusters having 10- 100 KB of read data.
>>
>> Regards
>>
>> Hari
>> ------------------------------
>> *From:* Kant Kodali <kant@peernova.com>
>> *Sent:* Saturday, November 26, 2016 8:39:01 PM
>> *To:* user@cassandra.apache.org
>> *Subject:* Re: Java GC pauses, reality check
>>
>> @Harikrishnan Pillai: How many nodes you guys are running? and what is an
>> approximate read size and an approximate write size?
>>
>> On Fri, Nov 25, 2016 at 7:32 PM, Harikrishnan Pillai <
>> HPillai@walmartlabs.com> wrote:
>>
>>> We are running azul zing in prod with 1 million reads/s and 100 K
>>> writes/s with azul .we never had a major gc above 10 ms .
>>>
>>> Sent from my iPhone
>>>
>>> > On Nov 25, 2016, at 3:49 PM, Martin Schröder <martin@oneiros.de>
>>> wrote:
>>> >
>>> > 2016-11-25 23:38 GMT+01:00 Kant Kodali <kant@peernova.com>:
>>> >> I would also restate the following sentence "java GC pauses are
>>> pretty much
>>> >> a fact of life" to "Any GC based system pauses are pretty much a fact
>>> of
>>> >> life".
>>> >>
>>> >> I would be more than happy to see if someone can counter prove.
>>> >
>>> > Azul disagrees.
>>> > https://www.azul.com/products/zing/pgc/
>>> >
>>> > Best
>>> >   Martin
>>>
>>
>>
>

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