This is indeed probably not a hardware issue but related to the new database abstraction layer (Hibernate), similar to https://jira.duraspace.org/browse/DS-3004
Can someone share the profiling report of a case where it runs really slow? [image: logo] Tom Desair 250-B Suite 3A, Lucius Gordon Drive, West Henrietta, NY 14586 Esperantolaan 4, Heverlee 3001, Belgium www.atmire.com <http://atmire.com/website/?q=services&utm_source=emailfooter&utm_medium=email&utm_campaign=tomdesair> 2016-12-02 16:11 GMT+01:00 <wltant...@gmail.com>: > I have similar specs, except for ssd drives: > > 8 CPUs, GenuineIntel, 2299.998 MHz > 32 GB with -Xmx16384m > tomcat 8,0.33 > postgresql-9.5.1 > > Like I said, this same machine cruised nicely with v5.6. Page loads are > subjectively slower across the board, but the Submission page load time is > an upgrade killer. > > On Friday, December 2, 2016 at 4:08:02 AM UTC-6, Joan Caparros wrote: >> >> We are experiencing the something similar but in all our repository >> (except the home page), almost all pages in DSpace 6x takes between 6s to >> 60seconds, we have tried to increase the memory of the tomcat, changed the >> SO (Centos7 to Ubuntu), upgrading tomcat (8.0.5 to 8.5), giving more cpus, >> changing data to ssd hard drive... all without a signigicant improvements >> of performance. >> >> Our configs are: >> >> Vcpus : 8 (GenuineIntel 2099.998MHz) >> >> Tomcat (8.5.8) config: -Xmx4072M -Xms512M -XX:PermSize=256M >> -XX:MaxPermSize=512m >> >> Items: arroung 120k >> >> Now we have in production DSpace 3_x and this situation is preventing us >> from upgrading also. >> >> Bests >> >> Joan >> El 01/12/16 a les 22:15, wlta...@gmail.com ha escrit: >> >> In DSpace 6x, it takes an intolerable 10 minutes (!!!) to populate the >> Select Collection drop-down in my instance when logging in as a regular >> user as opposed to an administrator. >> >> I can add hardware details if anybody is interested, but I'm pretty sure >> it's not the problem -- this is a beefy machine that hummed along nicely >> with version 5.x... >> >> We have a little over 1000 collections in our repository, and we use >> shibboleth for authentication so findAuthorizedPerformanceOptimize is >> set to it's default of false. >> >> Some rudimentary profiling suggests that the isAdmin() call in >> authorize() is the bottleneck. In a recent test (pretty typical), the >> findAuthorized() function takes 704,040 ms to return. The time spent in >> the isAdmin() call amounts to 590,691 ms, or about 83% of the time. >> Another bottleneck within this bottleneck is the recursive call to >> isAdmin(parent collection) -- about 400,000 ms. Clearly there is a lot of >> waste in this call because many many collections will be tested over and >> over. In our case, we have a single community that is the ancestor of >> every community/collection, and isAdmin() winds up being called against it >> 1012 times -- same as the number of collections in the repository -- and >> 1011 of them are redundant. >> >> As a further test, I have short-circuited isAdmin() to return false >> immediately. The results in the rendering of the drop-down in about 94,000 >> msec. Still way too long, but a drastic improvement. >> >> When logging in as an administrator, isAdmin() returns rather quickly and >> the list is populated much quicker as well. But for the everyday user, the >> performance is a big red light preventing us from upgrading. >> >> Sorry, this is simply stating the problem with no solution. But has >> anybody else with a similarly sized repository experienced this slow down? >> >> Regards, >> Bill >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "DSpace Technical Support" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to dspace-tech...@googlegroups.com. >> To post to this group, send email to dspac...@googlegroups.com. >> Visit this group at https://groups.google.com/group/dspace-tech. >> For more options, visit https://groups.google.com/d/optout. >> >> >> -- >> ......................................................................... >> >> Joan Caparrós >> Tècnic de Projectes >> Consorci de Serveis Universitaris de Catalunya (CSUC) >> >> Gran Capità, 2 (Edifici Nexus)•08034 Barcelona >> T.93 551 6204•F.93 205 6979•joan.c...@csuc.catwww.csuc.cat •Twitter >> @CSUC_info•Facebook•Linkedin >> Subscriu-te al butlletí; (www.csuc.cat/butlleti) >> ......................................................................... >> >> -- > You received this message because you are subscribed to the Google Groups > "DSpace Technical Support" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to dspace-tech+unsubscr...@googlegroups.com. > To post to this group, send email to dspace-tech@googlegroups.com. > Visit this group at https://groups.google.com/group/dspace-tech. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "DSpace Technical Support" group. 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