+1 1.8G heap is on a very low side. 32-64GB is more interesting cases.
Best regards, Vladimir Rodionov Principal Platform Engineer Carrier IQ, www.carrieriq.com e-mail: [email protected] ________________________________________ From: Kevin O'dell [[email protected]] Sent: Wednesday, July 10, 2013 2:27 PM To: [email protected] Subject: Re: G1 before/after GC time graph Anyway you can test this with a 32GB heap? :) On Wed, Jul 10, 2013 at 5:23 PM, Otis Gospodnetic < [email protected]> wrote: > But, very importantly: > > CPU after changes: https://apps.sematext.com/spm/s/CpZ9aPhL9L > Load after changes: https://apps.sematext.com/spm/s/i7f3x6MXdZ > > So in practical terms, use something like -XX:MaxGCPauseMillis=200 > -XX:NewRatio=4 to force short GC pauses, but count on having more of > them and CPU sweating more. This gives you smaller pauses, no big STW > pauses, but be prepared to pay in CPU cycles. > > HTH > > Otis > -- > HBase Performance Monitoring -- http://sematext.com/spm > > > > On Wed, Jul 10, 2013 at 4:20 PM, Otis Gospodnetic > <[email protected]> wrote: > > Not big in this case - 1800m > > > > Otis > > -- > > HBase Performance Monitoring -- http://sematext.com/spm > > > > > > > > On Wed, Jul 10, 2013 at 3:57 PM, Vladimir Rodionov > > <[email protected]> wrote: > >> > >> What is -Xmx heap size? > >> > >> Best regards, > >> Vladimir Rodionov > >> Principal Platform Engineer > >> Carrier IQ, www.carrieriq.com > >> e-mail: [email protected] > >> > >> ________________________________________ > >> From: Otis Gospodnetic [[email protected]] > >> Sent: Wednesday, July 10, 2013 12:00 PM > >> To: [email protected] > >> Subject: G1 before/after GC time graph > >> > >> Hi, > >> > >> There was talk of G1 and HBase here over the past few days. I wanted > >> to share a fresh and telling SPM graph showing G1 + some other params > >> in action: > >> > >> Result first: https://apps.sematext.com/spm/s/wN0hKVixxX > >> > >> This is what we had before: > >> -XX:+HeapDumpOnOutOfMemoryError -XX:+UseG1GC > >> -XX:InitiatingHeapOccupancyPercent=35 -XX:G1ReservePercent=25 > >> > >> And then we added: > >> -XX:MaxGCPauseMillis=200 -XX:NewRatio=4 > >> > >> I hope this helps. > >> > >> Otis > >> -- > >> HBase Performance Monitoring -- http://sematext.com/spm > >> > >> Confidentiality Notice: The information contained in this message, > including any attachments hereto, may be confidential and is intended to be > read only by the individual or entity to whom this message is addressed. If > the reader of this message is not the intended recipient or an agent or > designee of the intended recipient, please note that any review, use, > disclosure or distribution of this message or its attachments, in any form, > is strictly prohibited. If you have received this message in error, please > immediately notify the sender and/or [email protected] and > delete or destroy any copy of this message and its attachments. > -- Kevin O'Dell Systems Engineer, Cloudera Confidentiality Notice: The information contained in this message, including any attachments hereto, may be confidential and is intended to be read only by the individual or entity to whom this message is addressed. If the reader of this message is not the intended recipient or an agent or designee of the intended recipient, please note that any review, use, disclosure or distribution of this message or its attachments, in any form, is strictly prohibited. If you have received this message in error, please immediately notify the sender and/or [email protected] and delete or destroy any copy of this message and its attachments.
