Ok, I'll see if I can spot some spare time to implement it :-) Regards, Tommaso
2012/9/14 Thomas Jungblut <[email protected]> > 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] > > > >> > > > > > > > > > > > > > >
