Actually its not hanging, I tried to run it in isolation.

Without Vectorization With Vectorization Time Value Time Value S1115 67.98 0.065529 1186.44 0.065536

That means degradation of -1645.28%

Regards RKS -----Original Message----- From: Ramana Radhakrishnan [mailto:ramana.radhakrishnan@linaro.org] Sent: Thursday, May 03, 2012 12:38 PM To: Singh, Ravi Kumar (Ravi) Cc: Ulrich Weigand; linaro-toolchain Subject: Re: Vectorization paper / kernels.

On 30 April 2012 15:10, Singh, Ravi Kumar (Ravi) Ravi.Singh@lsi.com wrote:

Ramana,

My tests S115 is hanging in the vectorized version of TSVC benchmark.

Thanks for trying it out - I hadn't really tried it out when I had sent the mail. Uli is planning to look into these in the next few days.

Ramana

Regards RKS

-----Original Message----- From: linaro-toolchain-bounces@lists.linaro.org [mailto:linaro-toolchain-bounces@lists.linaro.org] On Behalf Of Ramana Radhakrishnan Sent: Monday, April 30, 2012 3:44 AM To: Ulrich Weigand Cc: linaro-toolchain Subject: Vectorization paper / kernels.

Hi Uli,

While looking into something else I ran into these - I wonder how many of these GCC manages to vectorize ...

http://www.netlib.org/benchmark/livermorec . These look interesting from a vectorizer kernels point of view.

The other interesting paper of note was this PACT paper on vectorization benchmarks comparing icc , xlc and GCC which might provide some interesting hints / reading. http://polaris.cs.uiuc.edu/~garzaran/doc/pact11.pdf . The appropriate benchmarks kernels are linked to below.

http://polaris.cs.uiuc.edu/ ̃maleki1/TSVC.tar.gz.

regards, Ramana

---

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Ramana,

If I use -fvect-cost-model it reverts bacl to novec perf

regards RKS ________________________________________ From: Ramana Radhakrishnan [ramana.radhakrishnan@linaro.org] Sent: Thursday, May 03, 2012 3:03 PM To: Singh, Ravi Kumar (Ravi) Cc: Ulrich Weigand; linaro-toolchain Subject: Re: Vectorization paper / kernels.

On 3 May 2012 19:30, Singh, Ravi Kumar (Ravi) Ravi.Singh@lsi.com wrote:

Actually its not hanging, I tried to run it in isolation.

     Without Vectorization    With Vectorization
     Time     Value           Time         Value

S1115 67.98 0.065529 1186.44 0.065536

That means degradation of -1645.28%

Sounds to me like vectorization might have gone awry - What happens if you use something like -fvect-cost-model ? Does that make any difference ? It sounds to me like a pathological runaway vectorization which might have resulted in massive spills causing such a regression. For the record this was just a pointer to a paper that might be of interest . I haven't really investigated the kernels to see how useful they really are :) .

regards, Ramana

Regards RKS -----Original Message----- From: Ramana Radhakrishnan [mailto:ramana.radhakrishnan@linaro.org] Sent: Thursday, May 03, 2012 12:38 PM To: Singh, Ravi Kumar (Ravi) Cc: Ulrich Weigand; linaro-toolchain Subject: Re: Vectorization paper / kernels.

On 30 April 2012 15:10, Singh, Ravi Kumar (Ravi) Ravi.Singh@lsi.com wrote:

...

Ramana,

My tests S115 is hanging in the vectorized version of TSVC benchmark.

Thanks for trying it out - I hadn't really tried it out when I had sent the mail. Uli is planning to look into these in the next few days.

Ramana

...

Regards RKS

-----Original Message----- From: linaro-toolchain-bounces@lists.linaro.org [mailto:linaro-toolchain-bounces@lists.linaro.org] On Behalf Of Ramana Radhakrishnan Sent: Monday, April 30, 2012 3:44 AM To: Ulrich Weigand Cc: linaro-toolchain Subject: Vectorization paper / kernels.

Hi Uli,

While looking into something else I ran into these - I wonder how many of these GCC manages to vectorize ...

http://www.netlib.org/benchmark/livermorec . These look interesting from a vectorizer kernels point of view.

The other interesting paper of note was this PACT paper on vectorization benchmarks comparing icc , xlc and GCC which might provide some interesting hints / reading. http://polaris.cs.uiuc.edu/~garzaran/doc/pact11.pdf . The appropriate benchmarks kernels are linked to below.

http://polaris.cs.uiuc.edu/ ̃maleki1/TSVC.tar.gz.

regards, Ramana

---

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Gentle reminder ________________________________________ From: Singh, Ravi Kumar (Ravi) Sent: Thursday, May 03, 2012 3:33 PM To: Ramana Radhakrishnan Cc: Ulrich Weigand; linaro-toolchain Subject: RE: Vectorization paper / kernels.

Ramana,

Can you suggest the flags used for optimal vectorization on A15 using GNU GCC 4.7.

Perhaps specific optimization flags for A15 would also help

regards RKSingh

________________________________________ From: Ramana Radhakrishnan [ramana.radhakrishnan@linaro.org] Sent: Thursday, May 03, 2012 3:03 PM To: Singh, Ravi Kumar (Ravi) Cc: Ulrich Weigand; linaro-toolchain Subject: Re: Vectorization paper / kernels.

On 3 May 2012 19:30, Singh, Ravi Kumar (Ravi) Ravi.Singh@lsi.com wrote:

Actually its not hanging, I tried to run it in isolation.

     Without Vectorization    With Vectorization
     Time     Value           Time         Value

S1115 67.98 0.065529 1186.44 0.065536

That means degradation of -1645.28%

Sounds to me like vectorization might have gone awry - What happens if you use something like -fvect-cost-model ? Does that make any difference ? It sounds to me like a pathological runaway vectorization which might have resulted in massive spills causing such a regression. For the record this was just a pointer to a paper that might be of interest . I haven't really investigated the kernels to see how useful they really are :) .

regards, Ramana

Regards RKS -----Original Message----- From: Ramana Radhakrishnan [mailto:ramana.radhakrishnan@linaro.org] Sent: Thursday, May 03, 2012 12:38 PM To: Singh, Ravi Kumar (Ravi) Cc: Ulrich Weigand; linaro-toolchain Subject: Re: Vectorization paper / kernels.

On 30 April 2012 15:10, Singh, Ravi Kumar (Ravi) Ravi.Singh@lsi.com wrote:

...

Ramana,

My tests S115 is hanging in the vectorized version of TSVC benchmark.

Thanks for trying it out - I hadn't really tried it out when I had sent the mail. Uli is planning to look into these in the next few days.

Ramana

...

Regards RKS

-----Original Message----- From: linaro-toolchain-bounces@lists.linaro.org [mailto:linaro-toolchain-bounces@lists.linaro.org] On Behalf Of Ramana Radhakrishnan Sent: Monday, April 30, 2012 3:44 AM To: Ulrich Weigand Cc: linaro-toolchain Subject: Vectorization paper / kernels.

Hi Uli,

While looking into something else I ran into these - I wonder how many of these GCC manages to vectorize ...

http://www.netlib.org/benchmark/livermorec . These look interesting from a vectorizer kernels point of view.

The other interesting paper of note was this PACT paper on vectorization benchmarks comparing icc , xlc and GCC which might provide some interesting hints / reading. http://polaris.cs.uiuc.edu/~garzaran/doc/pact11.pdf . The appropriate benchmarks kernels are linked to below.

http://polaris.cs.uiuc.edu/ ̃maleki1/TSVC.tar.gz.

regards, Ramana

---

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