Choppy performance on QNAP running Duplicati 2.0.3.6

I am running duplicati on my qnap ts-431+ (arm cpu). I am uploading files to jottacloud.
I discovered that the cpu usage is very high so I changed the compression setting to 1 (low compression).
Now I am observing the followong behaviour:
The CPU usage rises for some minutes and no upload is happening. After that the upload rate rises and the cpu usage drops. This repeats on and on. I am wondering why duplicati isn’t using the time it needs for uploading to continue the compression. In this case I would not have this type of upload interruptions.

Ressource monitor on my qnap:

(upload parts are 250MB)

After compression finishes:

Average time for compressing 250MB ~10min
Average upload time: ~3min

edit:

grafik

sgen is causing most of the load. Is this expected behaviour?

Edit2:
It gets even worse. In one hour I am just able to upload 750MB. Backing up about 800gb will take its time…

Better multi threading is a big goal right now starting with v2.0.3.6 canary (which has some issues, so as with all Canary versions we can’t recommend using it on important data).

That being said, I don’t know how much multi threading will help on an ARM chip… And of course there are other resources to consider including memory and disk IO.

If you look on your temp folder while a backup is running do you see a lot of dup*.dindex* files with current timestamps? If so, then the upload step is likely your bottleneck. If not, then it could be any combination of:

  • disk reads (source data)
  • hashing (deduplication)
  • compression (though you’ve already lowered that)
  • encryption
  • disk writes (archives to be uploaded, memory thrashing)

You could try making sure your temp folder is on a different did than source files, or better yet is an SSD or ramdrive.


Could find 310 files of this type in the backup directory on jotta cloud

The HDD does not seem the bottleneck, the usage is low. CPU (94% usage of mono sgen in top) seems to be the main culprit.
The weird thing is that I also have a backup on an sftp storage with the same options. The only difference is that the encryption key is much longer for jotta (both aes256) does this makes a difference in encyrption speed?

edit: you meant the local temp folder right? I am looking for it :slight_smile:


btw:
[/share/CE_CACHEDEV1_DATA/.qpkg/Duplicati/tmp] # du -hs .
52G .

is this size “normal”?

I am using Duplicati 2.0.3.6

I did some tests and the solution seems to be the compression settings. I had to choose 0
My suspicion is that in the new version there is someting wrong with these settings.
I had the same options on the same nas for another backup and did not had these problems.
I have no idea how to investigate this further at this point (if somebody gives me a hint I will try to verify my suspision).

Nevertheless, my ressources are not used efficently:

It looks like compression setting 1 is as hard as 9 and 0 disables it.

“Normal” is relative based on your settings. If you’re using defaults (such as “Upload volume size” (–dblock) of 50MB and --asynchronous-upload-limit=4 then you shouldn’t see more than maybe 500MB in use in the temp folder.

Are all 52G current files or do some of them look like orphans from previous runs?

Note that some issues have been identified in version 2.0.3.6, including performance related ones, so you might want to consider downgrading to 2.0.3.5 and see if that helps at all.

The files are looking like this:

File list

[/share/CE_CACHEDEV1_DATA/.qpkg/Duplicati/tmp] # ls -ltra
drwxrwx— 6 admin administ 4096 May 4 14:07 …/
-rw-rw-rw- 1 admin administ 4612726 May 17 16:13 dup-f6fd3afd-f238-4644-80b0-bdd5622e082e
-rw-rw-rw- 1 admin administ 6386056 May 17 16:14 dup-ba4d927c-51fa-4820-9122-bb0f235de0d8
-rw-rw-rw- 1 admin administ 4508 May 17 16:15 dup-e60bc4d8-52a1-4161-bf94-4e68952ae1ae
-rw-rw-rw- 1 admin administ 338 May 17 19:08 dup-b6f21554-5550-4c36-bb26-2b6505338f7b
-rw-rw-rw- 1 admin administ 42502544 May 17 22:06 dup-1b48add9-197d-484d-8f9c-18c020782078
-rw-rw-rw- 1 admin administ 6389866 May 17 22:07 dup-5e8a50b3-b2ca-4694-bae1-9a8831a8d4a1
-rw-rw-rw- 1 admin administ 35056 May 17 22:15 dup-0f53426c-6ad4-4d31-8d3c-63a43f1431c1
-rw-rw-rw- 1 admin administ 338 May 18 01:07 dup-e27a1f06-15fc-4a25-bdca-5f21e7e6e1c4
-rw-rw-rw- 1 admin administ 337 May 18 04:08 dup-626a5449-4736-4d5d-b091-0f22f55d860a
-rw-rw-rw- 1 admin administ 338 May 18 07:07 dup-367c341c-f8c4-4636-ba44-bff22961f81d
-rw-rw-rw- 1 admin administ 338 May 18 10:09 dup-ccb910b8-f201-422d-b7da-a4dab502462e
-rw-rw-rw- 1 admin administ 338 May 18 13:09 dup-44be5d07-f09f-4954-9e27-20aa326c04ed
-rw-rw-rw- 1 admin administ 844142 May 18 16:06 dup-78367731-9a28-42cd-9864-8d8a8df1f165
-rw-rw-rw- 1 admin administ 6391202 May 18 16:06 dup-8dacc737-6bce-4183-979c-65636413ef1d
-rw-rw-rw- 1 admin administ 2628 May 18 16:07 dup-af359359-0127-48e6-bc4a-6c92b1d345ac
-rw-rw-rw- 1 admin administ 5563839 May 18 19:06 dup-04042e5b-10b9-4861-9e38-7a3ad49cc982
-rw-rw-rw- 1 admin administ 6392406 May 18 19:07 dup-a0ffb61b-5f0b-4bbb-bd8e-b2285f56cab0
-rw-rw-rw- 1 admin administ 6877 May 18 19:08 dup-1c05e6af-ac2d-45bd-aaa1-914f940fda13
-rw-rw-rw- 1 admin administ 4039294 May 18 22:06 dup-212ecc0d-e8f4-4b4a-9ce6-efc0746264da
-rw-rw-rw- 1 admin administ 6395461 May 18 22:06 dup-f371a8dd-b4f6-4a26-9223-2bc9786caf30
-rw-rw-rw- 1 admin administ 7234 May 18 22:08 dup-5663c282-cdd6-43ab-b44e-83434851aa03
-rw-rw-rw- 1 admin administ 338 May 19 01:09 dup-af3669e3-e80a-4374-8473-bf5dcdcd25dd
-rw-rw-rw- 1 admin administ 337 May 19 04:08 dup-50f8d26c-3793-4b9c-a836-a9b3f39f04f3
-rw-rw-rw- 1 admin administ 338 May 19 07:07 dup-016e0a66-f9fc-47e2-ae28-a891eac76ac6
-rw-rw-rw- 1 admin administ 338 May 19 10:09 dup-19312e16-53fb-4a7b-940a-75766f25b104
-rw-rw-rw- 1 admin administ 338 May 19 13:07 dup-57b5fa48-76f9-4c5a-ad1d-0c9b3392750f
-rw-rw-rw- 1 admin administ 52421908 May 19 14:44 dup-7123dc2c-4811-4269-9d10-67af4b0226ff
-rw-rw-rw- 1 admin administ 52365630 May 19 14:44 dup-29a0dbec-83f1-40df-866c-8d2c625499d6
-rw-rw-rw- 1 admin administ 52400727 May 19 14:44 dup-4baf4e2d-6221-4240-abc2-dc78875a0199
-rw-rw-rw- 1 admin administ 52428135 May 19 14:44 dup-d585236e-394b-49fd-9391-13eec2a98cf6
-rw-rw-rw- 1 admin administ 48177 May 19 14:45 dup-99169300-9d21-44c0-80a9-9183cb39bd12
-rw-rw-rw- 1 admin administ 37620 May 19 14:46 dup-bfffd6ba-3dd8-4ce1-a465-85bd64d4d5df
-rw-rw-rw- 1 admin administ 51620 May 19 14:47 dup-a10ca18a-e65c-4e37-948d-3014dd5eb142
-rw-rw-rw- 1 admin administ 35341 May 19 14:47 dup-539b8bb9-de57-4db0-ae8b-d0365d802419
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-rw-rw-rw- 1 admin administ 48227 May 19 14:49 dup-d65e2325-69af-4f64-9b64-80f6bd66aaec
-rw-rw-rw- 1 admin administ 41643 May 19 14:49 dup-3fb95f29-3ce2-4dbc-bcf9-2af4ff799821
-rw-rw-rw- 1 admin administ 52341176 May 19 14:50 dup-f68d6d46-c6dc-4b80-a177-59eceb74b385
-rw-rw-rw- 1 admin administ 52403627 May 19 14:50 dup-56b294ce-8698-4206-8b10-939ad8ac1c66
-rw-rw-rw- 1 admin administ 52389931 May 19 14:50 dup-2e6c5fdb-3c41-4c7b-997c-03d5d26a57d5
-rw-rw-rw- 1 admin administ 52358765 May 19 14:50 dup-9634ede9-1b01-4e7d-a92b-8dc540f625f6
-rw-rw-rw- 1 admin administ 42947 May 19 14:51 dup-50d951e7-e94c-436b-97cc-522c62623008
-rw-rw-rw- 1 admin administ 48274 May 19 14:52 dup-7e2a0030-a512-4dd1-88bd-8df1ce374818
-rw-rw-rw- 1 admin administ 41243 May 19 14:52 dup-7b481bca-b5d2-41d4-9d3a-47d35e801a2f
-rw-rw-rw- 1 admin administ 38877 May 19 14:53 dup-2a859db8-a6d6-4c29-8716-09719ec35e68
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-rw-rw-rw- 1 admin administ 42771 May 19 15:07 dup-f4c3d825-ff5b-437e-bfdb-985457652908
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[…]
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drwxrwxrwx 3 admin administ 135168 May 23 06:59 ./
-rw-rw-rw- 1 admin administ 76349708 May 23 07:00 dup-bb850cf9-9221-4d8f-a8e8-46207744a558
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The actual running process has been started on the 22.05. and nothing else is running at the moment.

How can I downgrade? Just replacing the executable?
Found it

edit:
seems that the hint with the downgrade did the job:


CPU and Upload are now working in parallel. I also left the compression activated.
And I also get this message:
grafik
which I didn’t had with 2.0.3.6 (collecting data)

Glad to hear it! (Sorry I didn’t include the link to the How-To - it’s still new so I keep forgetting it’s there.)

The “Collecting data” message issue has mostly just been a browser caching problem of some updated CSS - a few ctrl+f5 refreshes or a new incognito / private window generally resolves that issue.

I’ve gone ahead and flagged your post as the solution as well as updated the topic title to better reflect the specific issue that was address. Please let me know if you disagree with either! :slight_smile: