Sync to protondrive uses max CPU

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1

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What is the problem you are having with rclone?

I notice that when using sync to a protondrive destination, the local CPU cores get maxed out even when using options such as --max-age to minimise the number of files to be considered for transfer.

I use the --cpuprofile flag to generate a CPU profile and this is what I got:

Showing nodes accounting for 331.34s, 99.25% of 333.86s total
Dropped 551 nodes (cum <= 1.67s)
      flat  flat%   sum%        cum   cum%
   300.44s 89.99% 89.99%    300.44s 89.99%  crypto/internal/fips140/sha256.blockAVX2
    14.38s  4.31% 94.30%    328.17s 98.30%  crypto/internal/fips140/sha256.(*Digest).Write
     9.59s  2.87% 97.17%      9.59s  2.87%  runtime.memmove
     3.74s  1.12% 98.29%    304.20s 91.12%  crypto/internal/fips140/sha256.block
     3.17s  0.95% 99.24%    331.36s 99.25%  github.com/ProtonMail/go-crypto/openpgp/s2k.Iterated
     0.01s 0.003% 99.24%    331.38s 99.26%  github.com/ProtonMail/go-crypto/openpgp/s2k.(*Cache).GetOrComputeDerivedKey
     0.01s 0.003% 99.25%    331.57s 99.31%  github.com/ProtonMail/go-crypto/openpgp/v2.(*Entity).DecryptPrivateKeys
         0     0% 99.25%    331.56s 99.31%  github.com/ProtonMail/go-crypto/openpgp/packet.(*PrivateKey).decryptWithCache
         0     0% 99.25%    331.56s 99.31%  github.com/ProtonMail/go-crypto/openpgp/packet.DecryptPrivateKeys
         0     0% 99.25%    331.36s 99.25%  github.com/ProtonMail/go-crypto/openpgp/s2k.(*Params).Function.func3
         0     0% 99.25%    331.62s 99.33%  github.com/ProtonMail/gopenpgp/v3/crypto.(*Key).Unlock
         0     0% 99.25%    274.73s 82.29%  github.com/rclone/Proton-API-Bridge.(*ProtonDrive).GetActiveRevisionAttrs
         0     0% 99.25%     58.61s 17.56%  github.com/rclone/Proton-API-Bridge.(*ProtonDrive).ListDirectory
         0     0% 99.25%    282.42s 84.59%  github.com/rclone/Proton-API-Bridge.(*ProtonDrive).getLinkKR
         0     0% 99.25%     50.16s 15.02%  github.com/rclone/Proton-API-Bridge.(*ProtonDrive).getLinkKRByID
         0     0% 99.25%    332.06s 99.46%  github.com/rclone/go-proton-api.Link.GetKeyRing
         0     0% 99.25%    333.36s 99.85%  github.com/rclone/rclone/backend/protondrive.(*Fs).List
         0     0% 99.25%     58.61s 17.56%  github.com/rclone/rclone/backend/protondrive.(*Fs).List.func1
         0     0% 99.25%    274.73s 82.29%  github.com/rclone/rclone/backend/protondrive.(*Fs).newObjectWithLink
         0     0% 99.25%    274.73s 82.29%  github.com/rclone/rclone/backend/protondrive.(*Fs).readMetaDataForLink
         0     0% 99.25%    274.73s 82.29%  github.com/rclone/rclone/backend/protondrive.(*Fs).readMetaDataForLink.func1
         0     0% 99.25%    333.39s 99.86%  github.com/rclone/rclone/fs.pacerInvoker
         0     0% 99.25%    333.38s 99.86%  github.com/rclone/rclone/fs/list.DirSortedFn
         0     0% 99.25%    333.38s 99.86%  github.com/rclone/rclone/fs/list.listP
         0     0% 99.25%    333.38s 99.86%  github.com/rclone/rclone/fs/march.(*March).makeListDir.func1
         0     0% 99.25%    333.36s 99.85%  github.com/rclone/rclone/fs/march.(*March).processJob.func2
         0     0% 99.25%    333.39s 99.86%  github.com/rclone/rclone/lib/pacer.(*Pacer).Call
         0     0% 99.25%    333.39s 99.86%  github.com/rclone/rclone/lib/pacer.(*Pacer).call
         0     0% 99.25%    333.40s 99.86%  sync.(*WaitGroup).Go.func1

Should it really be spending all that time doing sha256 computation when it's doing literally a handful of checks and zero transfers ? (source tree contains a few thousand files).

Run the command 'rclone version' and share the full output of the command.

rclone v1.76.0-beta.10399.cfb90e3eb

  • os/version: ubuntu 22.04 (64 bit)
  • os/kernel: 6.8.0-124-generic (x86_64)
  • os/type: linux
  • os/arch: amd64
  • go/version: go1.26.5
  • go/linking: dynamic
  • go/tags: none

Which cloud storage system are you using? (eg Google Drive)

protondrive

The command you were trying to run (eg rclone copy /tmp remote:tmp)

rclone sync /home/markb/smartavionics/XXX proton:smartavionics/XXX -P --links --protondrive-replace-existing-draft=true --no-update-modtime \
  --log-file backup.log --log-file-max-size 1M --log-file-max-backups 3 --max-age 1w

Please run 'rclone config redacted' and share the full output. If you get command not found, please make sure to update rclone.

[proton]
type = protondrive
username = burtoogle
password = XXX
client_uid = XXX
client_access_token = XXX
client_refresh_token = XXX
client_salted_key_pass = XXX

A log from the command that you were trying to run with the -vv flag

2026/09/26 07:54:37 NOTICE: proton drive root link ID 'smartavionics/projects/pb5-ui': 401 GET https://drive-api.proton.me/core/v4/users: Invalid access tok
en (Code=401, Status=401), Attempt 1
2026/09/26 07:54:37 ERROR : proton drive root link ID 'smartavionics/projects/pb5-ui': 401 GET https://drive-api.proton.me/core/v4/users: Invalid access tok
en (Code=401, Status=401)
2026/09/26 07:55:16 NOTICE: proton drive root link ID 'smartavionics/projects/pb5-ui': 422 POST https://drive-api.proton.me/drive/shares/1du46izARGQ4uEzIJ4w
VXA/files: A file or folder with that name already exists (Code=2500, Status=422), Attempt 1
2026/09/26 07:55:16 ERROR : proton drive root link ID 'smartavionics/projects/pb5-ui': 422 POST https://drive-api.proton.me/drive/shares/1du46izARGQ4uEzIJ4w
VXA/files: A file or folder with that name already exists (Code=2500, Status=422)
2026/09/26 07:55:16 NOTICE: proton drive root link ID 'smartavionics/projects/pb5-ui': 422 POST https://drive-api.proton.me/drive/shares/1du46izARGQ4uEzIJ4wVXA/files: A file or folder with that name already exists (Code=2500, Status=422), Attempt 1
2026/09/26 07:55:16 ERROR : proton drive root link ID 'smartavionics/projects/pb5-ui': 422 POST https://drive-api.proton.me/drive/shares/1du46izARGQ4uEzIJ4wVXA/files: A file or folder with that name already exists (Code=2500, Status=422)
2026/09/26 07:55:32 NOTICE: proton drive root link ID 'smartavionics/projects/pb5-ui': 422 POST https://drive-api.proton.me/drive/shares/1du46izARGQ4uEzIJ4wVXA/files: A file or folder with that name already exists (Code=2500, Status=422), Attempt 1
2026/09/26 07:55:32 ERROR : proton drive root link ID 'smartavionics/projects/pb5-ui': 422 POST https://drive-api.proton.me/drive/shares/1du46izARGQ4uEzIJ4wVXA/files: A file or folder with that name already exists (Code=2500, Status=422)
2026/09/26 07:55:32 NOTICE: proton drive root link ID 'smartavionics/projects/pb5-ui': 422 POST https://drive-api.proton.me/drive/shares/1du46izARGQ4uEzIJ4wVXA/files: A file or folder with that name already exists (Code=2500, Status=422), Attempt 1
2026/09/26 07:55:32 ERROR : proton drive root link ID 'smartavionics/projects/pb5-ui': 422 POST https://drive-api.proton.me/drive/shares/1du46izARGQ4uEzIJ4wVXA/files: A file or folder with that name already exists (Code=2500, Status=422)
2

yeah that profile is the proton link key unlock path.

s2k.Iterated + sha256 is chewing cpu while List / GetActiveRevisionAttrs walks the remote. --max-age still has to decrypt those link keys so it doesnt save u there.

-cut --checkers to 1 or 2
-same for --transfers
-rclone copy --max-age 1w ... instead of sync if u only need new local stuff pushed (less march work)

big trees on protondrive just do this for me.

3

Hi, thanks a lot for the swift reply, I will try those suggestions.

4

hi,

can you pick just one single file. post for both the source flle and the dest file.
rclone hashsum sha1
rclone lsl

not sure about your use-case, but might want to experiment with flags such as
--ignore-checksum
--size-only