Yes, I wanted to have direct memory in Hama months ago, but hadn't managed to find enough time. That is a very good idea.
2012/9/14 Tommaso Teofili <[email protected]> > I think we may also create an Apache DirectMemory based DiskQueue which > cache things on disk but hides most of the complexity. > My 2 cents, > Tommaso > > 2012/9/14 Thomas Jungblut <[email protected]> > > > I have created an issue for that: > > HAMA-642<https://issues.apache.org/jira/browse/HAMA-642> > > > > 2012/9/14 Thomas Jungblut <[email protected]> > > > > > Basically I think that the graph should fit into memory of your task. > > > So the messages could cause the overflow. > > > > > > You can try out the DiskQueue, this can be configured with setting the > > > property "hama.messenger.queue.class" to > > > "org.apache.hama.bsp.message.DiskQueue". > > > > > > This will immediately flush the messages to disk. However this is > > > experimental currently, so if you try it out please tell us if it > helped. > > > > > > Thanks. > > > > > > To further scale this, we should write vertices that don't fit in > memory > > > on the disk. I will add another jira for that soon. > > > > > > 2012/9/14 庄克琛 <[email protected]> > > > > > >> oh, the HDFS block size is 128Mb, not 64Mb, so the 73Mb graph will not > > >> be split-ed on the HDFS. > > >> > > >> 2012/9/14 庄克琛 <[email protected]> > > >> > > >> > em... I have try your configure advise and restart the hama. > > >> > I use the Google web graph( > > >> > http://wiki.apache.org/hama/WriteHamaGraphFile ), > > >> > Nodes: 875713 Edges: 5105039, which is about 73Mb, upload to a small > > >> HDFS > > >> > cluster(block size is 64Mb), test the PageRank in ( > > >> > http://wiki.apache.org/hama/WriteHamaGraphFile ), got the result > as: > > >> > ################ > > >> > function@624-PC:~/hadoop-1.0.3/hama-0.6.0$ hama jar hama-6-P* > > >> > input-google ouput-google > > >> > 12/09/14 14:27:50 INFO bsp.FileInputFormat: Total input paths to > > >> process : > > >> > 1 > > >> > 12/09/14 14:27:50 INFO bsp.FileInputFormat: Total # of splits: 3 > > >> > 12/09/14 14:27:50 INFO bsp.BSPJobClient: Running job: > > >> job_201008141420_0004 > > >> > 12/09/14 14:27:53 INFO bsp.BSPJobClient: Current supersteps number: > 0 > > >> > Java HotSpot(TM) Server VM warning: Attempt to allocate stack guard > > >> pages > > >> > failed. > > >> > ################### > > >> > > > >> > Last time the supersteps could be 1 or 2, then the same result. > > >> > the task attempt****.err files are empty. > > >> > Is the graph too large? > > >> > I test on a small graph, get the right Rank results > > >> > > > >> > > > >> > 2012/9/14 Edward J. Yoon <[email protected]> > > >> > > > >> > I've added multi-step partitioning method to save memory[1]. > > >> >> > > >> >> Please try to configure below property to hama-site.xml. > > >> >> > > >> >> <property> > > >> >> <name>hama.graph.multi.step.partitioning.interval</name> > > >> >> <value>10000000</value> > > >> >> </property> > > >> >> > > >> >> 1. https://issues.apache.org/jira/browse/HAMA-599 > > >> >> > > >> >> On Fri, Sep 14, 2012 at 3:13 PM, 庄克琛 <[email protected]> > wrote: > > >> >> > HI, Actually I use this ( > > >> >> > > > >> >> > > >> > > > https://builds.apache.org/job/Hama-Nightly/672/artifact/.repository/org/apache/hama/hama-dist/0.6.0-SNAPSHOT/ > > >> >> > ) > > >> >> > to test again, I mean use this 0.6.0SNAPSHOT version replace > > >> everything, > > >> >> > got the same out of memory results. I just don't know what cause > > the > > >> >> out of > > >> >> > memory fails, only some small graph computing can be finished. Is > > >> this > > >> >> > version finished the " > > >> >> > [HAMA-596<https://issues.apache.org/jira/browse/HAMA-596 > > >]:Optimize > > >> >> > memory usage of graph job" ? > > >> >> > Thanks > > >> >> > > > >> >> > 2012/9/14 Thomas Jungblut <[email protected]> > > >> >> > > > >> >> >> Hey, what jar did you exactly replace? > > >> >> >> Am 14.09.2012 07:49 schrieb "庄克琛" <[email protected]>: > > >> >> >> > > >> >> >> > hi, every one: > > >> >> >> > I use the hama-0.5.0 with the hadoop-1.0.3, try to do some > large > > >> >> graphs > > >> >> >> > analysis. > > >> >> >> > When I test the PageRank examples, as the ( > > >> >> >> > http://wiki.apache.org/hama/WriteHamaGraphFile) shows, I > > download > > >> >> the > > >> >> >> > graph > > >> >> >> > data, and run the PageRank job on a small distributed cluser, > I > > >> can > > >> >> only > > >> >> >> > get the out of memory failed, with Superstep 0,1,2 works well, > > >> then > > >> >> get > > >> >> >> the > > >> >> >> > memory out fail.(Each computer have 2G memory) But when I test > > >> some > > >> >> small > > >> >> >> > graph, everything went well. > > >> >> >> > Also I try the trunk version( > > >> >> >> > > https://builds.apache.org/job/Hama-Nightly/672/changes#detail3 > > ), > > >> >> replace > > >> >> >> > my > > >> >> >> > hama-0.5.0 with the hama-0.6.0-snapshot, only get the same > > >> results. > > >> >> >> > Anyone got better ideas? > > >> >> >> > > > >> >> >> > Thanks! > > >> >> >> > > > >> >> >> > -- > > >> >> >> > > > >> >> >> > *Zhuang Kechen > > >> >> >> > * > > >> >> >> > > > >> >> >> > > >> >> > > > >> >> > > > >> >> > > > >> >> > -- > > >> >> > > > >> >> > *Zhuang Kechen* > > >> >> > > > >> >> > School of Computer Science & Technology > > >> >> > > > >> >> > ** > > >> >> > Nanjing University of Science & Technology > > >> >> > > > >> >> > Lab.623, School of Computer Sci. & Tech. > > >> >> > > > >> >> > No.200, Xiaolingwei Street > > >> >> > > > >> >> > Nanjing, Jiangsu, 210094 > > >> >> > > > >> >> > P.R. China > > >> >> > > > >> >> > Tel: 025-84315982** > > >> >> > > > >> >> > Email: [email protected] > > >> >> > > >> >> > > >> >> > > >> >> -- > > >> >> Best Regards, Edward J. Yoon > > >> >> @eddieyoon > > >> >> > > >> > > > >> > > > >> > > > >> > -- > > >> > > > >> > *Zhuang Kechen > > >> > * > > >> > > > >> > > > >> > > > >> > > >> > > >> -- > > >> > > >> *Zhuang Kechen* > > >> > > >> School of Computer Science & Technology > > >> > > >> ** > > >> Nanjing University of Science & Technology > > >> > > >> Lab.623, School of Computer Sci. & Tech. > > >> > > >> No.200, Xiaolingwei Street > > >> > > >> Nanjing, Jiangsu, 210094 > > >> > > >> P.R. China > > >> > > >> Tel: 025-84315982** > > >> > > >> Email: [email protected] > > >> > > > > > > > > >
