For performance reasons I switched to memory mapped IO. Is there a way to make memory-mapped IO work in Windows?
Thanks! 2012/9/10 Viktor Jevdokimov <viktor.jevdoki...@adform.com> > Do not use mmap/auto on Windows, standard access mode only. In > cassandra.yaml:**** > > disk_access_mode: standard**** > > ** ** > > ** ** > Best regards / Pagarbiai > *Viktor Jevdokimov* > Senior Developer > > Email: viktor.jevdoki...@adform.com > Phone: +370 5 212 3063, Fax +370 5 261 0453 > J. Jasinskio 16C, LT-01112 Vilnius, Lithuania > Follow us on Twitter: @adforminsider <http://twitter.com/#!/adforminsider> > What is Adform: watch this short video <http://vimeo.com/adform/display> > [image: Adform News] <http://www.adform.com> > * * > *Visit us at Dmexco:* Hall: 7, Aisle: A, Stand: 030 > September 12-13 Cologne, Germany > [image: dmexco] <http://www.dmexco.de/> > > Disclaimer: The information contained in this message and attachments is > intended solely for the attention and use of the named addressee and may be > confidential. If you are not the intended recipient, you are reminded that > the information remains the property of the sender. You must not use, > disclose, distribute, copy, print or rely on this e-mail. If you have > received this message in error, please contact the sender immediately and > irrevocably delete this message and any copies. > > *From:* Rene Kochen [mailto:rene.koc...@emea.schange.com] > *Sent:* Monday, September 10, 2012 14:47 > *To:* user@cassandra.apache.org > *Subject:* Re: High commit size**** > > ** ** > > The problem is that the system just freezes and nodes are dying. The > system becomes very unresponsive and it always happens when the shareable > amount of RAM reaches the total number of bytes in the system. > > Is there something in Windows that I can tune in order to avoid this > behavior? I cannot easily migrate to Linux right now. > > Thanks, > > Rene > > **** > > 2012/9/10 Oleg Dulin <oleg.du...@gmail.com>**** > > It is memory-mapped I/O. I wouldn't worry about it. > > BTW, Windows might not be the best choice to run Cassandra on. My > experience running Cassandra on Windows has not been positive one. We no > longer support Windows as our production platform. > > Regards, > Oleg > > > On 2012-09-10 09:00:02 +0000, Rene Kochen said:**** > > Hi all, > > On my test cluster I have three Windows Server 2008 R2 machines running > Cassandra 1.0.11 > > If i use memory mapped IO (the default), then the nodes freeze after a > while. Paging is disabled. > > The private bytes are OK (8GB). That is the amount I use in the -Xms and > -Xmx arguments. The virtual size is big as expected because of the memory > mapped IO. However, the working set size (size in RAM) is 24 GB (my total > RAM usage). If I look with Process Explorer to the physical memory section > I see a very high value in the "WS Sharable" section. > > Anyone has a clue what is going om here? > > Many thanks! > > Rene > <image>**** > > > > -- > Regards, > Oleg Dulin > NYC Java Big Data Engineer > http://www.olegdulin.com/ > > **** > > ** ** >
<<signature-logoc64.png>>
<<dmexco-logofa6.png>>
