many sync - big battery drain

[progserega]

Android Element use many sync calls at every day and it is in top of battery usage.

Element do many sync periodicaly - this is strange. For example - we get 2021-01-26 (graphs show only syncs-requests of my phone to my matrix-server) - every 2 hour we get many syncs. And get every hour at second part of day:

Statistics from server logs about this day:

cat /var/log/matrix-synapse/homeserver.log* | grep 2021-01-26 | grep '@progserega:rsprim.ru' | grep YD201 | cut -d ' ' -f26 | cut -d '?' -f1 | cut -d '+' -f1 | cut -d '!' -f1 | sort | uniq -c | sort -n
      1 /_matrix/client/r0/sendToDevice/m.room_key_request/$local.602bef93-d447-4c45-a028-16e224105c75
      2 /_matrix/client/r0/capabilities
      2 /_matrix/client/r0/pushers/set
      2 /_matrix/client/r0/voip/turnServer
      2 /_matrix/media/r0/config
      6 /_matrix/client/r0/pushers
      6 /_matrix/media/r0/upload
      7 /_matrix/client/unstable/room_keys/version
      9 /_matrix/client/r0/user/@progserega:rsprim.ru/account_data/im.vector.setting.breadcrumbs
     11 /_matrix/client/r0/devices
     16 /_matrix/media/r0/preview_url
     18 /_matrix/client/unstable/room_keys/keys
     32 /_matrix/client/r0/rooms/
     80 /_matrix/client/r0/keys/query
    423 /_matrix/client/r0/groups/
   4013 /_matrix/client/r0/sync

I think ~4000 syncs per day - big value. I wont show number events received by me at this day, but I do not know sql query for that. If you help me - I will attach this information in comment.

For example - week syncs:

We see periodicaly strange big number of syncs...

this essue as continue of #2163

Element Android: 1.0.13 gplay
Phone: Yotaphone2
Server: matrix-synapse-py3 1.21.2+stretch1 amd64 on debian 9

[progserega]

Yesterday, I get more big battery drain again:
Phone:

Syncs log on my server (this is syncs only from my phone, which I grep from server log):

500 syncs every ~2 hour... :-/ It is not normal. What is occur?

[Beiri22]

I did not measure syncs; but from time to time my android complains about high battery drain caused by element...

[progserega]

2 days ago my frends said me - change element to fluffy chat and see what I get.

So, I setup some monitoring sync for fluffy chat and element desktop (some account). And I get some statistic from phone for fluffy chat.
So...
Syncs on server for element-desktop:

Syncs on my server for fluffy chat:

Battery use by fluffy chat:
First day:

Second day:

Stat for second day:

For example battery use element-desktop some day ago:

Result:

1. Some strange situation for all clients: every 2 hour occure many syncs to server (I use ii matrix-synapse-py3 1.21.2+stretch1 amd64 Open federated Instant Messaging and VoIP server - debian 9.13)
2. But with this syncs - fluffy chat not use so more battery then element-android.

[progserega]

Today I restore Element-android (clear all cache in element options for clear test) and from second half of day I also use element-android. Fluffy chat stay work from day begin. And I see that element use more battery then Fluffy chat. And after restore element-android phone become freeze and heat and battery drain.

I can not use phone - element-android freeze phone to unusable state... :-(

[progserega]

Today I logout from my account on android-element, clear all data from app, login again and get new situation on server:

And on phone:

So, battery drain gone... I think problem in code, which resend unsent file. Some time ago I was seeing such situation.
May be element regularly try send unsent file - this not success, he tray again and again.
I will try test this steps to reproduce:

1. set on "airplane mode"
2. send file
3. wait ~2-3 minutes
4. set "airplane mode" off
5. see - how file will be sent. If it is not sent success - see how battery drain will be occur.

[progserega]

Today I test this steps:
#2803 (comment)
So, battery drain become occur. Phone not sleep all this day and at servers logs I see many-many syncs:

For example at screen show last 7 days.
And screenshots from phone (at first we see, that phone not sleep today, but today I do not use phone - he simply stay on table):

[progserega]

My phone very freeze. And today I start android console for see which app eat CPU:

I remove element from "running app list" (swipe element in list), eating CPU lost, but when phone receive new message in chat - "top" again show element with 12-40% CPU 1-2 minutes. Some times it is not use CPU, but some times phone freeze and top show big cpu use by element.

[ouchadam]

#4225 may have helped with this (included in EA 1.3.4)

@progserega could I ask for you check again with a recent version of the app? 🤞