Question: When (not to) pre-build a STAR index
gravatar for jhanks1981
11 months ago by
jhanks198110 wrote:

I am soon to lose my institutional HPC access, and want to port some of my projects to run on a commercial cloud. To avoid excessive costs, I only want to pay when I am using it, and not pay for any more resources than I need. Ideally, I would rent a high memory system for a short period of time in order to build genome indexes for STAR (which requires 64GB of memory, far more than any of my subsequent jobs should need). I also might need to provide other people with pre-built virtual machines that already have genome indexes built on them.

However, it seems that people recommend against using pre-built indexes. Or at least it was the overwhelming consensus in this thread: Pre made STAR Index?

So my question is: How I know when I need to build a new index? Every time I create a new installation? When I change versions of STAR? What kinds of problems can arise from pre-building a genome index?

star genome-index • 294 views
ADD COMMENTlink modified 5 months ago by Biostar ♦♦ 20 • written 11 months ago by jhanks198110
gravatar for Thibault D.
11 months ago by
Thibault D.690
European Union
Thibault D.690 wrote:

AFAIK, unless it is clearly written by developers, I build one index for a genome version/patch, for one version of a software (either majors or minors).

There is not software I know deep enough to be 100% sure the last commit did not change the index, even by a single maybe-very-important octet.

For STAR,, if you're upgrading from, then it requires new index build, and release notes are clear about that:

Important: the genome index has to be re-generated with the latest 2.7.0x release.

Authors did not mention new index changes with the last version. It's likely to be unnecessary, but I would re-build index.

ADD COMMENTlink written 11 months ago by Thibault D.690
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