I should clarify the first sentence. With a bunch of external machinery to support a distributed transaction model, it's possible to run BDB across machines, but Elephant doesn't have any of it so can only use the built-in shared memory locking facility. There was some talk a year or two ago about doing a distributed locking solution for Elephant, but I don't know the status of it.
Thanks, Ian On May 4, 2011, at 11:51 AM, Ian Eslick wrote: > BDB does not work across multiple machines, its transaction support relies on > a shared memory region to handle locking so any shared memory architecture > (with multiple CPUs) works fine but separate machines and a NAS device don't > work. You'll have to use the Postgres store (5x slower, but reasonably > scalable) if you want concurrent access to a single Elephant DB from multiple > machines. > > On May 4, 2011, at 11:37 AM, Lukas Georgieff wrote: > >> Hi Leslie, >> >>> Hi Lukas, >>> >>>> Has someone any experience using elephant in that manner? >>> >>> Yes -- lots in fact. But you need to ask a specific question. >> >> well, if the points I've mentioned before are correct, I've only one >> specific question :-) >> >> We want to share a network device that contains the Berkeley-DB files. >> This BDB shall be accessed by two or more other machines that execute a SBCL >> interpreter with our program. >> >> I am not sure if this works similar to executing two SBCL instances on one >> machine, because I don't know if the elephant-bdb-locking works >> Across several machines! >> >> >> Thanks in advance, >> >> Lukas >> >> >> _______________________________________________ >> elephant-devel site list >> elephant-devel@common-lisp.net >> http://common-lisp.net/mailman/listinfo/elephant-devel > > > _______________________________________________ > elephant-devel site list > elephant-devel@common-lisp.net > http://common-lisp.net/mailman/listinfo/elephant-devel _______________________________________________ elephant-devel site list elephant-devel@common-lisp.net http://common-lisp.net/mailman/listinfo/elephant-devel
