Ubuntu
ubuntuone-client package

ubuntuone-syncdaemon hashing slows down session startup

Bug #1044942 reported by Sebastien
14
This bug affects 3 people
Affects Status Importance Assigned to Milestone
ubuntuone-client (Ubuntu)
Triaged
High
Ubuntu One Client Engineering team

Bug Description

ubuntuone-syncd is usually hashing during the first minutes of my desktop sessions.

For some reasons (GMA500 video card not supported https://wiki.ubuntu.com/HardwareSupportComponentsVideoCardsPoulsbo/) my laptop is "naturally" running slowly, especially just after login when the unity desktop is starting.

The "top" command shows me that ubuntuone-syncdaemon is consuming 100% of my CPU during and still after the desktop startup, which I suppose contributes greatly to the impression of slowness I have

I see no reason why a synchronization daemon should have same priority that processes of the user interface and I think the user experience could be improved by changing the process niceness.

I've tried and it's a bit better, that's why I wish the line "os.nice(19)" could be added in the ubuntuone-syncd python script.

Alejandro J. Cura (alecu)
Changed in ubuntuone-client (Ubuntu):
status: New → Triaged
importance: Undecided → High
assignee: nobody → Ubuntu One Desktop+ team (ubuntuone-desktop+)
Revision history for this message
Sebastien (tuzisan) wrote :

This screenshot taken just after desktop login shows a system load greater than 4 while the laptop has only 2 cores, and ubuntuone-syncdaemon hashing. Before I modified its nice value to 19, it was 0 and interactivity was really bad.

Revision history for this message
Sebastien (tuzisan) wrote :

This screenshot shows that few minutes after having opened the desktop session, after startup application have initialized, ubuntuone-syncdaemon is still hashing and consumes lot of resources.

The size of files in my Ubuntu One account is about 300M each, which is a possible explanation for such a long time spent in hashing. However I tried this command to get a hash value of one of these files on the same computer:

$ time sha1sum 300.mega.bytes.file
9ee2e5689ece78a5644aa357597473cb127a7e4c 300.mega.bytes.file

real 0m12.493s
user 0m3.976s
sys 0m8.189s

And I get a result in 12s, which makes me think that the right solution for ubuntuone-syncdaemon could be not only executing with a higher nice value, but also using a less time consuming hashing algorithm.

Cheers.

Revision history for this message
JohnRB (rbxtnc) wrote :

I have the same issue, ubuntuone-syncd uses an extreme amount of cpu for the first few minutes after login. I am running and Intel NUC D54250WYK.

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