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Diagnóstico de servidor lento — identificação rápida de causas comuns: sessions explosion, cron duplicado, I/O wait em BTRFS, health monitors em conflito
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| name | bianinho-servidor-lento |
| description | Diagnóstico de servidor lento — identificação rápida de causas comuns: sessions explosion, cron duplicado, I/O wait em BTRFS, health monitors em conflito |
| category | devops |
| tags | ["servidor","diagnóstico","lentidão","performance","sessions","cron","iowait"] |
Servidor lento, load elevado (> 1.5), CPU com I/O wait alto, ou não saber porque o sistema está sobrecarregado.
uptime && top -b -n 1 | head -20
vmstat 1 3
ls ~/.hermes/sessions/*.json | wc -l && du -sh ~/.hermes/sessions/
crontab -l && hermes cron list
pgrep -a python | grep -v grep
Sintoma: ~/.hermes/sessions/ > 500MB ou > 500 ficheiros. Load alto, muitos processos python.
Causa: Scripts que usam delegate_task, hermes chat -Q, ou spawning de subagentes Hermes criam uma sessão por execução. Se um cron job corre a cada 30min há dias, multiplica-se rapidamente.
Identificar:
ls -lt ~/.hermes/sessions/session_*.json | head -20
ls -lt ~/.hermes/sessions/*.json | awk '{print $6,$7,$8}' | sort | uniq -c | sort -rn | head
Fix imediato:
ls -t ~/.hermes/sessions/*.json | tail -n +51 | xargs rm -f
Prevenir: Health monitors e scripts de monitorização devem usar subprocess directo em vez de delegate_task ou hermes chat -Q.
Sintoma: Load 2x o esperado, mesma verificação feita duas vezes.
Causa: Existe um health monitor no cron do sistema E outro via hermes cron. Ambos correm em paralelo.
Identificar:
crontab -l
cat /etc/cron.d/*
hermes cron list
Fix: Manter só UM health monitor — tipicamente o mais recente (hermes cron). Remover o legado:
crontab -l | grep -v "proativo_health_monitor.py" > /tmp/cron.txt && crontab /tmp/cron.txt
Sintoma: vmstat 1 mostra wa > 15%. Load alto mas CPU% normal.
Causa mais comum: timeshift --check --scripted a correr de hora em hora (:00). Em BTRFS, faz scan massivo de snapshots.
Identificar:
cat /etc/cron.d/timeshift-hourly
grep timeshift /var/log/syslog | tail -5
Fix:
sudo sed -i 's/^0 \* \* \* \* root/0 * * * * root #DISABLED: timeshift/' /etc/cron.d/timeshift-hourly
Sintoma: vmstat 1 mostra si/so > 0.
Fix:
sudo sync && echo 3 | sudo tee /proc/sys/vm/drop_caches
# Sessões Hermes antigas — manter 50 mais recentes
ls -t ~/.hermes/sessions/*.json | tail -n +51 | xargs rm -f
du -sh ~/.hermes/sessions/
| Métrica | Valor normal | Alerta |
|---|---|---|
| Load average | < 1.0 | > 1.5 |
| I/O wait (wa) | < 5% | > 15% |
| RAM disponível | > 5GB | < 2GB |
| Swap usado | < 10% | > 30% |
| Sessões Hermes | < 100 | > 500 |
| Disco sessions/ | < 100MB | > 500MB |
Descobertas em produção — 20/04/2026 — Álvaro reported server slowness.
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