Remote development becomes unstable on 1 vCPU servers after Zed 0.200+ (heartbeat timeouts) #43809
Description
Reproduction steps
Reproduction Steps
- Create any VPS with:
- 1 vCPU AMD EPYC
- 1–2 GB RAM
- open remote development SSH into the machine with Zed 0.200+.
- open big project example ipfs/kubo
- Wait 300–600 seconds (even idle).
- Heartbeats begin to fail.
- Zed goes into a reconnect loop.
Upgrading this exact instance to 2 vCPU fixes the issue immediately.
Current vs. Expected behavior
Expected Behavior
Zed Remote Server should not lose heartbeat on idle workload, even on minimal CPUs.
Versions before 0.200 handled 1 vCPU environments normally.
Actual Behavior
On a 1 vCPU host, Zed Remote Server misses heartbeats and enters an infinite reconnect loop.
Zed version and system specs
zed 0.212.5
os: Distributor ID: ManjaroLinux
Description: Manjaro Linux
Release: 25.0.0
Codename: Zetar
Linux d469f12fd92c 6.8.0-58-generic #60-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 14 18:29:48 UTC 2025 x86_64 GNU/Linux
memory 2GB
cpu: AMD EPYC 7001
Attach Zed log file
Zed.log
25-11-14T18:21:14+02:00 INFO [remote_server::unix] (remote server) Got new node settings: NodeBinarySettings { path: None, npm_path: None, ignore_system_version: false }
2025-11-14T18:21:15+02:00 INFO [extension_host::headless_host] (remote server) Loaded language server: vscode-html-language-server
2025-11-14T18:21:15+02:00 INFO [lsp] (remote server) starting language server process. binary path: "/home/ptrzx/.local/share/zed/languages/gopls/gopls_0.20.0_go_1.24.3", working directory: "/home/ptrzx/nb/tpb/gtpb", args: ["-mode=stdio"]
2025-11-14T18:21:16+02:00 INFO [extension_host::headless_host] (remote server) Loaded language server: intelephense
2025-11-14T18:21:16+02:00 INFO [extension_host::headless_host] (remote server) Loaded language server: phpactor
2025-11-14T18:21:16+02:00 INFO [extension_host::headless_host] (remote server) Loaded language server: phptools
2025-11-14T18:21:16+02:00 INFO [extension_host::headless_host] (remote server) Loaded debug adapter: Xdebug
2025-11-14T18:21:27+02:00 WARN [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 1 out of 5.
2025-11-14T18:21:27+02:00 INFO [remote::remote_client] setting state to 'heartbeat missed'
2025-11-14T18:21:37+02:00 WARN [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 2 out of 5.
2025-11-14T18:21:47+02:00 WARN [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 3 out of 5.
2025-11-14T18:21:57+02:00 WARN [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 4 out of 5.
2025-11-14T18:22:07+02:00 WARN [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 5 out of 5.
2025-11-14T18:22:07+02:00 ERROR [remote::remote_client] Missed last 5 heartbeats. Reconnecting...
2025-11-14T18:22:07+02:00 INFO [remote::remote_client] setting state to 'reconnecting'
2025-11-14T18:22:07+02:00 INFO [remote::remote_client] Trying to reconnect to ssh server... Attempt 1
2025-11-14T18:22:08+02:00 INFO [remote::transport::ssh] Remote shell discovered: /usr/bin/bash
2025-11-14T18:22:08+02:00 INFO [remote::transport::ssh] Remote platform discovered: /usr/bin/bash
2025-11-14T18:22:13+02:00 ERROR [remote::remote_client] Reconnect attempt 1 failed: Timed out resyncing remote client. Starting new attempt...
2025-11-14T18:22:13+02:00 INFO [remote::remote_client] Trying to reconnect to ssh server... Attempt 2
2025-11-14T18:22:14+02:00 INFO [remote::transport::ssh] Remote shell discovered: /usr/bin/bash
2025-11-14T18:22:14+02:00 INFO [remote::transport::ssh] Remote platform discovered: /usr/bin/bash
2025-11-14T18:22:19+02:00 ERROR [remote::remote_client] Reconnect attempt 2 failed: Timed out resyncing remote client.
2025-11-14T18:22:19+02:00 INFO [remote::remote_client] Trying to reconnect to ssh server... Attempt 3
2025-11-14T18:22:20+02:00 INFO [remote::transport::ssh] Remote shell discovered: /usr/bin/bash
2025-11-14T18:22:20+02:00 INFO [remote::transport::ssh] Remote platform discovered: /usr/bin/bash
2025-11-14T18:22:26+02:00 ERROR [remote::remote_client] Reconnect attempt 3 failed: Timed out resyncing remote client.
2025-11-14T18:22:26+02:00 ERROR [remote::remote_client] Failed to reconnect after 3 attempts, giving up
Relevant Zed settings
settings.json
(for AI issues) Model provider details
No response
If you are using WSL on Windows, what flavor of Linux are you using?
None