It should take a little bit more than 2.2 Gb of memory to operate.
Check your shell memory limits:

$ ulimit -a

(or, in csh simply: limit)

You may need to override your default memory limit to get this
command to run.  See also:
http://www.cims.nyu.edu/cgi-comment/man.cgi?section=1&topic=limit

Or, you could use blat on each individual chromosome sequence.

--Hiram

Vinodh Srinivasasainagendra wrote:
> Many thanks for your recommendation.
> 
> I used the parameter settings mentioned in anchored section #5 on the
> page you recommended, but it spilts a ' needHugeMen' error message. I
> have loads of mem (~20GB) available on this workstation where I am
> performing blat.
> 
> blat -stepSize=5 -repMatch=2253 -minScore=0 -minIdentity=0 -out=blast9
> hg18.2bit test_seq.txt test_seq_blas9.out
>  
> needHugeMen: Out of huge memory - request size 2106194880 bytes
> 
> 
> Is the only difference between web-blat and command-line blat is
> 'repMatch' (command-line default is '1024' and web-based is '2253')?
> 
> If the answer to the above question is YES, then what should I be doing
> to handle this error message 'needHugeMen: Out of huge memory - request
> size 2106194880 bytes'.
> 
> Again, my execution line is ' blat -stepSize=5 -repMatch=2253
> -minScore=0 -minIdentity=0 -out=blast9 hg18.2bit test_seq.txt
> test_seq_blas9.out'
> 
> 
> vinodh
> 
> -----Original Message-----
> From: Hiram Clawson [mailto:[email protected]] 
> Sent: Thursday, February 11, 2010 4:08 PM
> To: Vinodh Srinivasasainagendra
> Cc: [email protected]
> Subject: Re: [Genome] Blat related question,
> 
> Good Afternoon Vinodh:
> 
> Please note this discussion about operating blat:
> http://genome.ucsc.edu/FAQ/FAQblat.html#blat5
> 
> --Hiram
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