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Sep 12, 2025
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remove batchSize from performance.md recommendations #34

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AskAlexSharov Sep 12, 2025
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31 changes: 7 additions & 24 deletions src/advanced/performance.md
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@@ -1,47 +1,30 @@
# Performance Tricks


These instructions are designed to improve the performance of Erigon 3, particularly for synchronization and memory management, on cloud drives and other systems with specific performance characteristics.


## Increase Sync Speed

* Set `--sync.loop.block.limit=10_000` and `--batchSize=2g` to speed up the synchronization process.
```bash
--sync.loop.block.limit=10_000 --batchSize=2g
```
* Increase download speed with flag ```--torrent.download.rate=[value]``` setting your max speed (default value is 128MB). For example:
```bash
--torrent.download.rate=512mb
```

## Optimize for Cloud Drives

* Set `SNAPSHOT_MADV_RND=false` to enable the operating system's cache prefetching for better performance on cloud drives with good throughput but bad latency.
```bash
SNAPSHOT_MADV_RND=false
```

## Lock Latest State in RAM

* Use `vmtouch -vdlw /mnt/erigon/snapshots/domain/*bt` to lock the latest state in RAM, preventing it from being evicted due to high historical RPC traffic.
* Use `vmtouch -vdlw /mnt/erigon/snapshots/domain/*bt` to lock the "latest state indices" in RAM, preventing it from being evicted due to high historical RPC traffic.
```bash
vmtouch -vdlw /mnt/erigon/snapshots/domain/*bt
```

* Run `ls /mnt/erigon/snapshots/domain/*.kv | parallel vmtouch -vdlw` to apply the same locking to all relevant files.

## Handle Memory Allocation Issues

* If you encounter issues with memory allocation, run the following to flush any pending write operations and free up memory:
* Or same for "whole latest sate": `ls /mnt/erigon/snapshots/domain/*.kv | parallel vmtouch -vdlw`
* If you encounter "cannot allocate memory" issues with above commands, then free memory by next command and re-try:
```bash
sync && sudo sysctl vm.drop_caches=3
sync && sudo sysctl vm.drop_caches=3 && echo 1 > /proc/sys/vm/compact_memory
```

* Alternatively, set:
## Optimize for Cloud Drives

* Cloud Drives (gp3, pd-ssd) have good throughput but bad latency. So, we don't recommend them to Erigon. But still can set `SNAPSHOT_MADV_RND=false` to enable the operating system's cache prefetching - but it will lead to huge IO if RAM is small.
```bash
echo 1 > /proc/sys/vm/compact_memory
SNAPSHOT_MADV_RND=false
```

to help with memory allocation.