[ceph-users] Confusion in Erasure Code benchmark app

2015-07-14 Thread Nitin Saxena 
Hi All,

I am trying to debug ceph_erasure_code_benchmark_app available in ceph
repo. using cauchy_good technique. I am running gdb using following command:

src/ceph_erasure_code_benchmark --plugin jerasure_neon --workload encode
--iterations 10 --size 1048576 --parameter k=6 --parameter m=2 --parameter
directory=src/.libs --parameter packetsize=3072 --parameter
technique=cauchy_good

My confusion here is why underlying GF(32) function galois_w32_region_xor()
is called even if the parameter value of w passed in
jerasure_schedule_encode() is 8.

According to me since GF(8) is passed in jerasure_schedule_encode() (with
parameter w==8) then underlying gf function galois_w8_region_xor() should
have been called instead of GF(32) function galois_w32_region_xor

Thanks in advance
Nitin
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Re: [ceph-users] Confusion in Erasure Code benchmark app

2015-07-14 Thread Loic Dachary 
Hi,

I've observed the same thing but never spent time to figure that out. It would 
be nice to know. I don't think it's a bug, just something slightly confusing.

Cheers

On 14/07/2015 14:52, Nitin Saxena wrote:
 Hi All,
 
 I am trying to debug ceph_erasure_code_benchmark_app available in ceph repo. 
 using cauchy_good technique. I am running gdb using following command:
 
 src/ceph_erasure_code_benchmark --plugin jerasure_neon --workload encode 
 --iterations 10 --size 1048576 --parameter k=6 --parameter m=2 --parameter 
 directory=src/.libs --parameter packetsize=3072 --parameter 
 technique=cauchy_good
 
 My confusion here is why underlying GF(32) function galois_w32_region_xor() 
 is called even if the parameter value of w passed in 
 jerasure_schedule_encode() is 8. 
 
 According to me since GF(8) is passed in jerasure_schedule_encode() (with 
 parameter w==8) then underlying gf function galois_w8_region_xor() should 
 have been called instead of GF(32) function galois_w32_region_xor
 
 Thanks in advance
 Nitin
 
 
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-- 
Loïc Dachary, Artisan Logiciel Libre



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