Thanks for the awesome reply. It has really helped me clear a lot. You are really an awesome and great individual Andy.
So that means (if I am not wrong) that --time gives the cold cache time. On Fri, Dec 20, 2013 at 8:41 PM, Andy Seaborne <a...@apache.org> wrote: > On 20/12/13 14:16, Rose Beck wrote: > >> Ok. Thanks a lot Andy for the link. >> > > Mainly for Maria who has asked the question before > > > >> But now from the question ...I am bit curious to understand what is meant >> by a running system and time taken to attach a store..in Jena docs. Can >> you >> please clarify? >> > > The store is the database on disk. > > Opening it means access the disk so depending on the setup, that can be > distorting on the figures. TDB caches heavily (all databases do - disks > are slow) so it takes time to settle down for meaningful timing figures. > > Anyone serious about benchmarks needs to use a framework e.g. > > http://www.slideshare.net/RobVesse/practical-sparql-benchmarking > > as well as be clear about what exactly they are testing. > > The number of academic papers that have weak benchmarks is really quite > alarming. Reviewers are letting through material that does little to > contribute to the literature. Failures include not comparing > like-with-like (e.g memory vs disk, systems that were designed for > something else, ...), and, my pet hate, not running at large enough scale, > so it is running a disk database out of RAM cache. > > Useful figures are hard to obtain - not a last minute addition. > > Andy > > > >> >> On Fri, Dec 20, 2013 at 7:43 PM, Andy Seaborne <a...@apache.org> wrote: >> >> On 20/12/13 14:00, Maria Jackson wrote: >>> >>> Is it possible to find the time that a particular query takes to >>>> run(compilatiion + execution time) in Jena TDB. >>>> >>>> I think it is possible add these within the code. But is there any other >>>> way out...is there some build-in Jena TDB feature which allows me to >>>> find >>>> the time a query takes in total (i..e plan generation + executing it). >>>> >>>> I'll be highly grateful to you for the same. >>>> I have a paper submission deadline tomorrow..an early response is highly >>>> appreciated. >>>> >>>> >>>> This is a repeat question: >>> >>> http://mail-archives.apache.org/mod_mbox/jena-users/201311.mbox/% >>> 3CCALZBbQs4PqmX9JXha2EDw3ywRfyFixoJmsZyCMYCFAfYdps3Pw%40mail.gmail.com >>> %3E >>> >>> >> > > > store -= >
