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FAQ: Run time

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Alexander Dobin edited this page Jun 16, 2020 · 2 revisions

Run-time resources

Q: How much RAM does STAR use?

STAR major memory requirements are:

  • Genome + Suffix Array: *~(1+8/genomeSAsparseD)**GenomeLength bytes.
  • SAindex: ~6*4^(genomeSAindexNbases) bytes. By default --genomeSAindexNbases 14 and it takes 1.5GB of RAM. If you reduce --genomeSAindexNbases to 12 you can make it <100MB.
  • limitIObufferSize*NumberOfThreads for I/O buffers. By default, it's 150MB per thread, but you can probably go as low as 50MB per thread.
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