Expand system tuning docs
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@ -46,10 +46,14 @@ that CUDA is enabled: `"[<timestamp> solana::validator] CUDA is enabled"`
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## System Tuning
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For Linux validators, the solana repo includes a daemon to adjust system settings to optimize
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performance (namely by increasing the OS UDP buffer limits, and scheduling PoH with realtime policy).
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### Linux
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#### Automatic
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The solana repo includes a daemon to adjust system settings to optimize performance
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(namely by increasing the OS UDP buffer limits, and scheduling PoH with realtime policy).
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The daemon (`solana-sys-tuner`) is included in the solana binary release.
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The daemon (`solana-sys-tuner`) is included in the solana binary release. Restart
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it, *before* restarting your validator, after each software upgrade to ensure that
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the latest recommended settings are applied.
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To run it:
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@ -57,6 +61,53 @@ To run it:
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sudo solana-sys-tuner --user $(whoami) > sys-tuner.log 2>&1 &
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```
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#### Manual
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If you would prefer to manage system settings on your own, you may do so with
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the following commands.
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##### **Increase UDP buffers**
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```bash
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sudo bash -c "cat >/etc/sysctl.d/20-solana-udp-buffers.conf <<EOF
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# Increase UDP buffer size
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net.core.rmem_default = 134217728
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net.core.rmem_max = 134217728
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net.core.wmem_default = 134217728
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net.core.wmem_max = 134217728
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EOF"
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```
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```bash
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sudo sysctl -p /etc/sysctl.d/20-solana-udp-buffers.conf
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```
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##### **Increased memory mapped files limit**
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```bash
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sudo bash -c "cat >/etc/sysctl.d/20-solana-mmaps.conf <<EOF
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# Increase memory mapped files limit
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vm.max_map_count = 500000
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EOF"
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```
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```bash
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sudo sysctl -p /etc/sysctl.d/20-solana-mmaps.conf
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```
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Add
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```
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LimitNOFILE=500000
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```
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to the `[Service]` section of your systemd service file, if you use one,
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otherwise add it to `/etc/systemd/system.conf`.
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```bash
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sudo systemctl daemon-reload
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```
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```bash
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sudo bash -c "cat >/etc/security/limits.d/90-solana-nofiles.conf <<EOF
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# Increase process file descriptor count limit
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* - nofile 500000
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EOF"
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```
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```bash
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### Close all open sessions (log out then, in again) ###
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```
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## Generate identity
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Create an identity keypair for your validator by running:
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