Hi, 

We usually download the pygr NLMSA from the UCLA server. However, the 
latest mm10 - multiz60way alignment does not exist there so we decided to 
build it. 

First I ran into issues with max size, 

*       1 msa = cnestedlist.NLMSA(pathstem=pathstem,*
*       2                             seqDict=genomeUnion,*
*----> 3                             mafFiles=maflist, mode="w")*
*
*
*site-packages/pygr-0.8.2-py2.7-linux-x86_64.egg/pygr/cnestedlist.so in 
pygr.cnestedlist.NLMSA.__init__()*
*site-packages/pygr-0.8.2-py2.7-linux-x86_64.egg/pygr/cnestedlist.so in 
pygr.cnestedlist.NLMSA.readMAFfiles()
*
*
*
*ValueError: MAF block too long!  Increase max size*

Setting the maxlen and maxint to a billion also did not help so I set it to 
sys.maxint. 

However this code still fails because it open 1000's of ".build" files and 
fails because it does not have "write permission" on the next file handle 
it tries to open. Basically hits the max open files limit. I increased the 
ulimit to 10,000 files at which point it fails with "Segmentation fault 
(core dumped)"

Here is lsof out every 0.1 s when it failed, 
170 # these are file handles to genome files
170
170
170
170
170
170
726 # starts creating .build files
1682
2443
3706
6300
7209
9160 # hits the upper limit again and fails with a core dump. 

I have tried this with py2.6/pygr0.8.1 and py2.7/pygr0.8.2 and get the same 
error. 

Has anyone experienced this? 
What are the .build files?

Vishal








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