Continuous out-of-memory

m.holmes · January 18, 2021, 7:54pm

Hi everyone,

I’m trying to run Syncthing on an IoT device, basically a raspberry pi2 that has ssh enabled, an ethernet connection and a large hard drive (!). My goal is to transfer some files from a large directory that is already shared by Syncthing on the same local network, so I simply scp’ed the arm binary, shared the folder (as receive-only), and put in place some additional filters, to select precisely the subset of files I need.

It was all working perfectly, but at some point the process started crashing continuously, likely out-of-memory:

[monitor] 17:20:23 INFO: Syncthing exited: signal: killed
[start] 17:20:25 INFO: syncthing v1.12.1 "Fermium Flea" (go1.15.6 linux-arm) teamcity@build.syncthing.net 2020-12-06 12:46:27 UTC

is there any combination of settings that is advised to keep memory usage down? Note that in my case, I’m in the same LAN as the other machine.

I’m able to start Syncthing with -paused, but as soon as I unpause it, it crashes and restarts within a minute or so.

thanks in advance MH

calmh · January 18, 2021, 8:15pm

One gig of RAM, right? I’d think that should be plenty for one folder, one device with default settings, I think. Under the assumption that most of it is free and/or you have swap set up. What’s the actual, full, error trace when it dies?

m.holmes · January 18, 2021, 8:53pm

Not sure precisely, but I think it may be 512MB. top says:

Mem: 300540K used, 105676K free, 16284K shrd, 140156K buff, 88444K cached

Here’s roughly when the crashes started:

[PVCOA] 10:52:03 INFO: c.S.listenerSupervisor: Entering the backoff state.
[PVCOA] 10:52:03 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (2.963105 failures of 2.000000), restarting: false, error: %!s(<nil>)
[PVCOA] 11:02:15 INFO: c.S.listenerSupervisor: Exiting backoff state.
[PVCOA] 11:02:15 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:02:16 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:02:16 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:02:16 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.000000 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:02:16 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:02:17 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:02:17 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:02:17 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.987327 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:02:17 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:02:17 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:02:17 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:02:17 INFO: c.S.listenerSupervisor: Entering the backoff state.
[PVCOA] 11:02:17 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (2.955315 failures of 2.000000), restarting: false, error: %!s(<nil>)
[monitor] 11:04:28 INFO: Syncthing exited: signal: killed
[start] 11:04:31 INFO: syncthing v1.12.1 "Fermium Flea" (go1.15.6 linux-arm) teamcity@build.syncthing.net 2020-12-06 12:46:27 UTC
[PVCOA] 11:04:40 INFO: My ID: PVCOALW-VXLFTYA-4HPJX3M-JUYVHDB-MNSKMX5-Y74JAO4-EL7XE27-CDEPJAQ
[PVCOA] 11:04:41 INFO: Single thread SHA256 performance is 4.2 MB/s using minio/sha256-simd (4.2 MB/s using crypto/sha256).
[PVCOA] 11:04:43 INFO: Hashing performance is 3.74 MB/s
[PVCOA] 11:04:43 INFO: Overall send rate is unlimited, receive rate is unlimited
[PVCOA] 11:04:43 INFO: Using discovery mechanism: global discovery server https://discovery.syncthing.net/v2/?noannounce&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW
[PVCOA] 11:04:43 INFO: Using discovery mechanism: global discovery server https://discovery-v4.syncthing.net/v2/?nolookup&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW
[PVCOA] 11:04:43 INFO: Using discovery mechanism: global discovery server https://discovery-v6.syncthing.net/v2/?nolookup&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW
[PVCOA] 11:04:43 INFO: Stored folder metadata for "kerq9-hpdtz" is inconsistent; recalculating
[PVCOA] 11:04:43 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:04:43 INFO: Using discovery mechanism: IPv4 local broadcast discovery on port 21027
2021/01/18 11:04:43 connection doesn't allow setting of receive buffer size. See https://github.com/lucas-clemente/quic-go/wiki/UDP-Receive-Buffer-Size for details.
[PVCOA] 11:04:43 INFO: Using discovery mechanism: IPv6 local multicast discovery on address [ff12::8384]:21027
[PVCOA] 11:04:43 INFO: QUIC listener ([::]:22000) starting
[PVCOA] 11:04:43 INFO: TCP listener ([::]:22000) starting
[PVCOA] 11:04:43 INFO: quic://0.0.0.0:22000 detected NAT type: Full cone NAT
[PVCOA] 11:04:43 INFO: quic://0.0.0.0:22000 resolved external address quic://95.232.25.97:64594 (via stun.syncthing.net:3478)
[PVCOA] 11:04:44 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:04:44 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:04:44 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.000000 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:04:44 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:04:44 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:04:44 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:04:44 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.983902 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:04:44 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:04:45 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:04:45 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:04:45 INFO: c.S.listenerSupervisor: Entering the backoff state.
[PVCOA] 11:04:45 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (2.952322 failures of 2.000000), restarting: false, error: %!s(<nil>)
[PVCOA] 11:04:47 INFO: GUI and API listening on [::]:8384
[PVCOA] 11:04:47 INFO: Access the GUI via the following URL: http://127.0.0.1:8384/
[PVCOA] 11:04:47 INFO: My name is "temp"
[PVCOA] 11:04:47 INFO: Device B3TV5JK-7WSO5HH-5VD4XMG-NOV6TK5-MVT2Z57-5LPWSDM-H45OI67-3ALLEQV is "SyncThingSrv" at [dynamic]
[PVCOA] 11:04:47 WARNING: Syncthing should not run as a privileged or system user. Please consider using a normal user account.
[PVCOA] 11:04:53 INFO: Detected 0 NAT services
[PVCOA] 11:05:10 INFO: Established secure connection to B3TV5JK-7WSO5HH-5VD4XMG-NOV6TK5-MVT2Z57-5LPWSDM-H45OI67-3ALLEQV at 192.168.1.158:22000-192.168.1.170:22000/tcp-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[PVCOA] 11:05:10 INFO: Device B3TV5JK-7WSO5HH-5VD4XMG-NOV6TK5-MVT2Z57-5LPWSDM-H45OI67-3ALLEQV client is "syncthing v1.12.1" named "SyncThingSrv" at 192.168.1.158:22000-192.168.1.170:22000/tcp-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[PVCOA] 11:11:07 INFO: Device B3TV5JK-7WSO5HH-5VD4XMG-NOV6TK5-MVT2Z57-5LPWSDM-H45OI67-3ALLEQV folder "Main Library" (kerq9-hpdtz) has a new index ID (0x989F5108B952D2B2)
[PVCOA] 11:12:42 INFO: Ready to synchronize "Main Library" (kerq9-hpdtz) (receiveonly)
[PVCOA] 11:19:21 INFO: c.S.listenerSupervisor: Exiting backoff state.
[PVCOA] 11:19:22 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:19:26 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:19:26 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:19:26 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:19:26 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.000000 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:19:27 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:19:27 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:19:27 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.972294 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:19:27 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:19:28 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:19:28 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:19:28 INFO: c.S.listenerSupervisor: Entering the backoff state.
[PVCOA] 11:19:28 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (2.917575 failures of 2.000000), restarting: false, error: %!s(<nil>)
[monitor] 11:23:13 INFO: Syncthing exited: signal: killed
[start] 11:23:15 INFO: syncthing v1.12.1 "Fermium Flea" (go1.15.6 linux-arm) teamcity@build.syncthing.net 2020-12-06 12:46:27 UTC
[PVCOA] 11:23:19 INFO: My ID: PVCOALW-VXLFTYA-4HPJX3M-JUYVHDB-MNSKMX5-Y74JAO4-EL7XE27-CDEPJAQ
[PVCOA] 11:23:20 INFO: Single thread SHA256 performance is 4.4 MB/s using crypto/sha256 (4.2 MB/s using minio/sha256-simd).
[PVCOA] 11:23:22 INFO: Hashing performance is 3.73 MB/s
[PVCOA] 11:23:22 INFO: Overall send rate is unlimited, receive rate is unlimited
[PVCOA] 11:23:22 INFO: Using discovery mechanism: global discovery server https://discovery.syncthing.net/v2/?noannounce&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW
[PVCOA] 11:23:22 INFO: Using discovery mechanism: global discovery server https://discovery-v4.syncthing.net/v2/?nolookup&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW
[PVCOA] 11:23:22 INFO: Using discovery mechanism: global discovery server https://discovery-v6.syncthing.net/v2/?nolookup&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW
2021/01/18 11:23:23 connection doesn't allow setting of receive buffer size. See https://github.com/lucas-clemente/quic-go/wiki/UDP-Receive-Buffer-Size for details.
[PVCOA] 11:23:23 INFO: QUIC listener ([::]:22000) starting
[PVCOA] 11:23:23 INFO: TCP listener ([::]:22000) starting
[PVCOA] 11:23:23 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:23:23 INFO: Using discovery mechanism: IPv4 local broadcast discovery on port 21027
[PVCOA] 11:23:23 INFO: Using discovery mechanism: IPv6 local multicast discovery on address [ff12::8384]:21027
[PVCOA] 11:23:23 INFO: Ready to synchronize "Main Library" (kerq9-hpdtz) (receiveonly)
[PVCOA] 11:23:24 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:23:24 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:23:24 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.000000 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:23:24 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:23:25 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:23:25 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:23:25 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.972814 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:23:25 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:23:26 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:23:26 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:23:26 INFO: c.S.listenerSupervisor: Entering the backoff state.
[PVCOA] 11:23:26 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (2.930912 failures of 2.000000), restarting: false, error: %!s(<nil>)
[PVCOA] 11:23:29 INFO: GUI and API listening on [::]:8384
[PVCOA] 11:23:29 INFO: Access the GUI via the following URL: http://127.0.0.1:8384/
[PVCOA] 11:23:29 INFO: My name is "temp"
[PVCOA] 11:23:29 INFO: Device B3TV5JK-7WSO5HH-5VD4XMG-NOV6TK5-MVT2Z57-5LPWSDM-H45OI67-3ALLEQV is "SyncThingSrv" at [dynamic]
[PVCOA] 11:23:29 WARNING: Syncthing should not run as a privileged or system user. Please consider using a normal user account.
[PVCOA] 11:23:33 INFO: Detected 0 NAT services
[PVCOA] 11:24:58 INFO: Established secure connection to B3TV5JK-7WSO5HH-5VD4XMG-NOV6TK5-MVT2Z57-5LPWSDM-H45OI67-3ALLEQV at 192.168.1.158:22000-192.168.1.170:22000/tcp-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[PVCOA] 11:24:58 INFO: Device B3TV5JK-7WSO5HH-5VD4XMG-NOV6TK5-MVT2Z57-5LPWSDM-H45OI67-3ALLEQV client is "syncthing v1.12.1" named "SyncThingSrv" at 192.168.1.158:22000-192.168.1.170:22000/tcp-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[PVCOA] 11:28:33 INFO: quic://0.0.0.0:22000 detected NAT type: Full cone NAT
[PVCOA] 11:28:33 INFO: quic://0.0.0.0:22000 resolved external address quic://95.232.25.97:64594 (via stun.syncthing.net:3478)
[PVCOA] 11:38:06 INFO: c.S.listenerSupervisor: Exiting backoff state.
[PVCOA] 11:38:07 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:38:08 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:38:08 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:38:08 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:38:08 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.000000 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:38:09 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:38:09 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:38:09 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.985104 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:38:09 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:38:09 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:38:09 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:38:09 INFO: c.S.listenerSupervisor: Entering the backoff state.
[PVCOA] 11:38:09 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (2.961271 failures of 2.000000), restarting: false, error: %!s(<nil>)
[PVCOA] 11:43:16 INFO: Completed initial scan of receiveonly folder "Main Library" (kerq9-hpdtz)
[PVCOA] 11:51:00 INFO: c.S.listenerSupervisor: Exiting backoff state.
[PVCOA] 11:51:00 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:51:02 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:51:02 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:51:02 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:51:02 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.000000 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:51:02 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:51:02 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:51:02 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.987572 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 11:51:02 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 11:51:03 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 11:51:03 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 11:51:03 INFO: c.S.listenerSupervisor: Entering the backoff state.
[PVCOA] 11:51:03 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (2.960581 failures of 2.000000), restarting: false, error: %!s(<nil>)
[PVCOA] 12:05:30 INFO: c.S.listenerSupervisor: Exiting backoff state.
[PVCOA] 12:05:31 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 12:05:32 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 12:05:32 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 12:05:32 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.000000 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 12:05:32 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 12:05:33 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 12:05:33 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 12:05:33 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (1.980551 failures of 2.000000), restarting: true, error: %!s(<nil>)
[PVCOA] 12:05:33 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[PVCOA] 12:05:34 INFO: Listen (BEP/relay): Get "https://relays.syncthing.net/endpoint": x509: certificate signed by unknown authority
[PVCOA] 12:05:34 INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) shutting down
[PVCOA] 12:05:34 INFO: c.S.listenerSupervisor: Entering the backoff state.
[PVCOA] 12:05:34 INFO: c.S.listenerSupervisor: Failed service 'dynamic+https://relays.syncthing.net/endpoint' (2.947724 failures of 2.000000), restarting: false, error: %!s(<nil>)
[monitor] 12:14:12 INFO: Syncthing exited: signal: killed

After this, crashes became more and more frequent, every 2 minutes or so, but the log is similar. Anyway, now I disabled basically everything except “local discovery”. At the moment the local state is ~90GB and there are still ~60GB to go, but I’m not sure it will survive an “unpause”.

Mem: 401748K used, 4468K free, 19724K shrd, 24376K buff, 284312K cached
CPU:   5% usr  14% sys  60% nic   0% idle   0% io   0% irq  19% sirq
Load average: 2.44 2.39 2.06 3/115 4719
  PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
 1785  1779 root     SN    795m 200%  82% ./syncthing -no-browser -paused
 1779   426 root     T     793m 200%   0% ./syncthing -no-browser -paused

Would for example wipe the db help somehow?

calmh · January 18, 2021, 8:57pm

I doubt it. I’d add some swap to help it over the peak.

m.holmes · January 18, 2021, 8:59pm

Unfortunately, as it’s an IoT device, I have very little control on the OS (“very little” is an euphemism)

m.holmes · January 18, 2021, 9:01pm

Would it help if I scp the initial set of files manually?

calmh · January 18, 2021, 9:02pm

I doubt that too. You can apparently ssh in and run things as root, so dd if=/dev/zero of=/some/place/with/space bs=1024k count=4096; mkswap /some/place/with/space; swapon /some/place/with/space and you should be good to go.

I would also moderate my expections on how well this will run. This:

[PVCOA] 11:04:43 INFO: Hashing performance is 3.74 MB/s

is literally two hundred times slower than a modern computer or even a phone.

m.holmes · January 18, 2021, 9:17pm

Thanks for the hint. Actually the problem is not root access, but the lack of tools, however all the binaries you mention are there, so I may want to try.

Performance is definitely not an issue here, we’re talking about a low-power device, I will consider success if it finishes sooner or later…

tomasz86 · January 19, 2021, 5:44am

There are a few settings that you can tweak to lower the resource usage, although how much impact it has you will need to verify yourself.

I gathered some tweaks last year in Optimising Syncthing for low end hardware.

m.holmes · January 19, 2021, 7:09am

Thanks. That’s really useful!

m.holmes · January 19, 2021, 12:26pm

Curiously, the swap space is active

# free 
              total        used        free      shared  buff/cache   available
Mem:         406216      168280       70932       13360      167004      331940
Swap:       4194296        8192     4186104

but Syncthing keeps on crashing, same message (killed)

calmh · January 19, 2021, 1:30pm

Maybe there are ulimits or other process limits in place. Since the kill is from the outside there is little we can do about it.

system · February 18, 2021, 1:30pm

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