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# GATK-Snp calling

Posts: 9

hi,

can anyone help to advice if splitting the bam files Versus splitting the -L region, which one could speed up faster? asssume that i have 500 bam files, will splitting the bam files to 22 different chromosomes will increase the speed further as compare to splitting the -L region (intervals)? Can anyone help to advice or probably had experienced it before. thank you.

Tagged:

• Posts: 9

hi, i was referring to Unified Genotyper (Snp Calling) in GATK.

Have a look at these documents, which cover the available parallelism modes:

Note that the -L argument is meant to specify target intervals if you are working with exome data.

Geraldine Van der Auwera, PhD

• Posts: 9

Thanks Geraldine for your answer,i understand that parellism(multi-threading) -nt do help. but i just want to confirm if the speed is equivalent? (with same -nt settings) whether splitting the -L region is equivalent to splitting the bam file?i really need this answer on top of -nt multi-threading to speed up my very huge sample sizes. i just dont want to spend time in splitting the bam file if it is equivalant (speed wise) to splitting the -L interval regions. thank you for help and advice:)

• Posts: 9
edited March 2013