GC Tuning

[Joseph]

Hi Tao,

Servers currently respond within  1.2 seconds .But this response may take more time, when there is garbage related issue. Servers logs ‘response is too slow’  which is usually occur due to the garbage pauses.

We need to deliver data within one second .Data size is not so large which is approximately 3 MB .

From: Tao Mao [mailto:yiyeguhu at gmail.com]
Sent: Saturday, September 19, 2015 8:23 AM
To: Joseph James
Cc: hotspot-gc-use
Subject: Re: GC Tuning

Hi Joseph,

What's the average response time under current settings?

What typical use cases are you expecting from HBase (get to know some basic idea of your application)? How large is your data set?

Thanks.
Tao Mao

On Fri, Sep 18, 2015 at 4:06 AM, Joseph <josephj at arssoftware.com<mailto:josephj at arssoftware.com>> wrote:
Hi Tao,

Thank you for your quick response.

I am trying to tune the No SQL database which require real time response. Here in some cases server not responding due to the garbage pauses. Maximum response pause allowed is below or equal to 100. When I set -XX:MaxGCPauseMillis=100 flag, each collection pause exceeds  at most of  100 milliseconds?. I want reduce the total pause time maximum of  100 milliseconds . Because server needs to respond within milliseconds.


Regards
Joseph

From: Tao Mao [mailto:yiyeguhu at gmail.com<mailto:yiyeguhu at gmail.com>]
Sent: Friday, September 18, 2015 2:21 AM
To: Joseph James
Cc: hotspot-gc-use
Subject: Re: GC Tuning

Hi,

What's the goal here (latency or throughput)? What's the bottom line now?

Thanks.
Tao Mao


On Thu, Sep 17, 2015 at 6:02 AM, Joseph <josephj at arssoftware.com<mailto:josephj at arssoftware.com>> wrote:
Hi ,

I am Joseph. I am trying to tune performance of  our server .I run server with following g1 gc options.

Maximum heap allocated to server is 5GB.

“ -XX:+UseG1GC -XX:MaxGCPauseMillis=100 -XX:ParallelGCThreads=4 -XX:InitiatingHeapOccupancyPercent=65 -XX:+ParallelRefProcEnabled -XX:-ResizePLAB -Xloggc:/var/log/hbase/gc-hbase.log -XX:+PrintGCDetails -XX:+PrintAdaptiveSizePolicy -XX:+PrintGCTimeStamps”

The gc logs resulted with above gc flags are attached with the mail.How to reduce garbage pause time in our server.

Thank you for your valuble time


Regards,
Joseph


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