Meilisearch High Memory Usage
Quick answer
Meilisearch memory-maps its database, so virtual memory looks huge but real RAM use is much smaller. During large indexing or dump imports memory does spike, so size the server accordingly.
Most likely fix: Read the right metric
How to fix it
Try these in order — the most common fix is first.
1. Read the right metric
- Check resident (RSS) memory, not virtual memory
- Page cache use is normally released when other processes need RAM
Did this fix it?2. Size and isolate
- Keep RAM around a third or less of the database size for fast search; exceeding RAM won't crash it
- Use NVMe SSD rather than HDD or network storage
- Avoid sharing the machine with other heavy services
- Send settings first and moderate batch sizes to limit indexing peaks
Did this fix it?
Symptoms
Monitoring shows hundreds of GB of virtual memory or the process using all available RAM.
Why it happens
- Virtual memory is address space reserved for the LMDB map, not real RAM
- LMDB uses free RAM as cache on a standalone server
- Large indexing jobs and dump imports spike memory
This guide also covers
- meilisearch high memory usage
- meilisearch out of memory
- meilisearch ram usage
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Other Meilisearch errors
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- Meilisearch Indexing Slow
- Meilisearch Documents Not Showing Up
- Meilisearch Primary Key Error
- Meilisearch Filter Not Working (Attribute Not Filterable)
- Meilisearch Invalid API Key / Missing Authorization Header
- Meilisearch Database Version Incompatible After Upgrade
- Meilisearch Disk Usage Keeps Growing / No Space Left on Device