https://bugs.kde.org/show_bug.cgi?id=364114
Bug ID: 364114 Summary: moving a folder within one maildir resource is extremely slow and inefficient Product: Akonadi Version: 16.04 Platform: Other OS: Linux Status: UNCONFIRMED Severity: normal Priority: NOR Component: Maildir Resource Assignee: kdepim-bugs@kde.org Reporter: mar...@lichtvoll.de Today I dared moving .Computer.directory/mesa-dev-ml with about 86730 mails to .Linux.directory by drag and drop within KMail. After the move operation completed kmail crashed. The operation took at least one and a half hour on a ThinkPad T520 with Intel Sandybridge i5-2520m dual core CPU and dual SSD BTRFS RAID 1 and 16 GiB of RAM! Reproducible: Always Steps to Reproduce: 1. Have a large maildir folder inside another folder. 2. Move it to a different folder Actual Results: 1. Akonadi first moves all mails into database or file_db_data depending on threshold. This process is extremely slow at a rate of about 20000-40000 mails in half an hour. During that the mysqld database process frequently uses about 90-99% of one logical core. This process takes about 1,5 hours for 86000 mails. martin@merkaba:~/.local/share/akonadi/file_db_data> date ; find -type f | wc -l Mi 8. Jun 20:41:59 CEST 2016 30339 martin@merkaba:~/.local/share/akonadi/file_db_data> date ; find -type f | wc -l Mi 8. Jun 20:42:07 CEST 2016 30473 martin@merkaba:~/.local/share/akonadi/file_db_data> date ; find -type f | wc -l Mi 8. Jun 20:42:16 CEST 2016 30494 martin@merkaba:~/.local/share/akonadi/file_db_data> date ; find -type f | wc -l Mi 8. Jun 20:42:32 CEST 2016 30708 martin@merkaba:~/.local/share/akonadi/file_db_data> date ; find -type f | wc -l Mi 8. Jun 20:42:53 CEST 2016 31131 martin@merkaba:~/.local/share/akonadi/file_db_data> date ; find -type f | wc -l Mi 8. Jun 20:45:58 CEST 2016 34562 martin@merkaba:~/.local/share/akonadi/file_db_data> date ; find -type f | wc -l Mi 8. Jun 21:28:28 CEST 2016 67480 martin@merkaba:~/.local/share/akonadi/file_db_data> cd .. martin@merkaba:~/.local/share/akonadi> date ; find file_db_data -type f | wc -l ; du -sh db_data Mi 8. Jun 21:28:58 CEST 2016 68099 4,9G db_data martin@merkaba:~/.local/share/akonadi> date ; find file_db_data -type f | wc -l ; du -sh db_data Mi 8. Jun 21:33:16 CEST 2016 74039 5,0G db_data martin@merkaba:~/.local/share/akonadi> date ; find file_db_data -type f | wc -l ; du -sh db_data Mi 8. Jun 21:45:13 CEST 2016 95529 5,1G db_data 2. Then after moving completed it copies the mails to the destination folder. This is quite quick. The mains still remain in file_db_data: martin@merkaba:~/.local/share/akonadi> date ; find file_db_data -type f | wc -l ; du -sh db_data Mi 8. Jun 21:53:26 CEST 2016 98737 5,1G db_data 3. KMail crashes. During the whole operation KMail does not respond to user input. It is completely blocked. Expected Results: When moving a folder within a local maildir resource, Akonadi does the following: 1. Rename the folder. 2. Store the folder renaming within the database. 3. KMail remains responsive at all times. In other words: The operation is completed within 10 seconds no matter how many mails are in the folder. Specifically Akonadi does not move each mail one time and then copying it. -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ Kdepim-bugs mailing list Kdepim-bugs@kde.org https://mail.kde.org/mailman/listinfo/kdepim-bugs