Hi everybody, just to add our observation: at least in a mixed mode, where write and read queries happen in parallel, we also see this kind of behavior, that the system "seems" to serialize accesses in some way under certain circumstances. I say "seems", as we can only judge from the blocking behavior of the UI.
This is especially obvious, when EDG queries available collections for a user (e.g. when the user for the first time opens the collection dropdown). When this somewhat costly operation runs, many operations of other users seem to get serialized, and the world has to wait, until that one operation has finished (which takes ~36 seconds in our case - that's why it got so obvious). We see this (in the UI) by the spinning IO indicator - and it affects read and write operations (not only writes). However, we cannot exclude that this is not blocking, but just a tremendous slowdown of parallel running queries, which might seem like blocking. Maybe this observation helps to pinpoint potential causes. LG Bernd On Tuesday, February 11, 2025 at 7:40:57 PM UTC+1 Holger Knublauch wrote: > I would encourage you to submit this to our support portal so that our > support team can better understand why this would happen in your setup. > > Thanks > Holger > > > On 11 Feb 2025, at 4:00 pm, bostoM <tayeb....@gmail.com> wrote: > > > Hi Holger and thank's for your answer. > > Yes queries against the sparql-endoint and no updates onyl RO queries ? > > Best > > Le mardi 11 février 2025 à 15:57:37 UTC+1, Holger Knublauch a écrit : > > Hello, > > No, EDG can definitely run multiple queries in parallel, especially > read-only queries. > > What in particular are you running in parallel? Queries against the SPARQL > endpoint? Are some of them UPDATEs? > > Holger > > > On Feb 11, 2025, at 15:54, bostoM <tayeb....@gmail.com> wrote: > > Hello, > > I am reaching out because we have encountered an issue with EDG version > 7.8. It appears that we cannot execute multiple queries simultaneously; > instead, each query must wait for the previous one to finish. I believe > this limitation was not present in version 5. > > Could you please confirm whether the inability to execute simultaneous > queries in EDG 7.8 is an intentional limitation or simply a configuration > issue on our side? > > Thank you for your assistance. > > Best, > > -- > The topics of this mailing list include TopBraid EDG and related > technologies such as SHACL. > To post to this group, send email to topbrai...@googlegroups.com > --- > You received this message because you are subscribed to the Google Groups > "TopBraid Suite Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to topbraid-user...@googlegroups.com. > To view this discussion visit > https://groups.google.com/d/msgid/topbraid-users/7b0d5794-06c1-4bbb-a64f-71ec6b1479e9n%40googlegroups.com > > <https://groups.google.com/d/msgid/topbraid-users/7b0d5794-06c1-4bbb-a64f-71ec6b1479e9n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > > -- > The topics of this mailing list include TopBraid EDG and related > technologies such as SHACL. > To post to this group, send email to topbrai...@googlegroups.com > --- > You received this message because you are subscribed to the Google Groups > "TopBraid Suite Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to topbraid-user...@googlegroups.com. > > To view this discussion visit > https://groups.google.com/d/msgid/topbraid-users/451ff270-d448-476b-9490-17d948c02928n%40googlegroups.com > > <https://groups.google.com/d/msgid/topbraid-users/451ff270-d448-476b-9490-17d948c02928n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > -- The topics of this mailing list include TopBraid EDG and related technologies such as SHACL. To post to this group, send email to topbraid-users@googlegroups.com --- You received this message because you are subscribed to the Google Groups "TopBraid Suite Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to topbraid-users+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/topbraid-users/f37acb24-8cdf-4984-b274-8212b7249a2cn%40googlegroups.com.
