llvm dev - Dec 2018 - Memory Consumption and Execution Time static Statistics in LLVM. Can llvm-mca help?

Hello,
I am PhD student. My work deals with finding the *memory (RAM) consumption*
as indicated by *linux RSS* output and *execution time *as indicated by*
linux time* command at compile time using LLVM. How can I do this? Like if
i pass dataset size and application to llvm compiler, it should tell
the *estimated
memory consumption* and *time taken* to execute given application with
given dataset, but all at compile time? I am trying to avoid profiling
here. I wont get accurate values, hence rough estimated values of memory
consumption and time are enough...

Can llvm-mca help me in finding these statistics? or I need to write a new
compiler analysis pass to find these values?

Please help  how to proceed.

 Thank You
Regards
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Hello,
It seems that you are asking whether LLVM can provide a time- and
memory-complexity analysis of the source code, and then estimate how a specific
given dataset would be handled by that source code.
It's not the kind of thing that compilers do, and I cannot imagine that LLVM
has any way to provide this analysis.  The compiler's task is to create a
semantically equivalent transformation of the source code into machine code, it
has no need to understand the algorithmic complexity of the input source code.
I don't claim intimate knowledge of llvm-mca, but my understanding is that
it looks at relatively small fragments of the compiled code; I'm not aware
that it really understands control-flow, and it certainly has no understanding
of memory consumption.
Best regards,
--paulr

From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of hameeza
ahmed via llvm-dev
Sent: Thursday, December 20, 2018 3:08 PM
To: llvm-dev
Subject: [llvm-dev] Memory Consumption and Execution Time static Statistics in
LLVM. Can llvm-mca help?

Hello,
I am PhD student. My work deals with finding the memory (RAM) consumption as
indicated by linux RSS output and execution time as indicated by linux time
command at compile time using LLVM. How can I do this? Like if i pass dataset
size and application to llvm compiler, it should tell the estimated memory
consumption and time taken to execute given application with given dataset, but
all at compile time? I am trying to avoid profiling here. I wont get accurate
values, hence rough estimated values of memory consumption and time are
enough...

Can llvm-mca help me in finding these statistics? or I need to write a new
compiler analysis pass to find these values?

Please help  how to proceed.

 Thank You
Regards
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