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QINSB is not a Software Blog

QINSB is not a Software Blog. Thursday, November 8, 2012. Funny performance characteristics of DBI tools. These days I'm working on dynamic binary instrumentation (DBI) tools built with DynamoRIO, in particular Dr. Memory. One of the things people always as is, "So what's the slowdown? Are you faster than Valgrind? The answer is incredibly complicated, as performance questions usually are. The easy answer is, "On SPEC? 10x slowdown, and yes, we are faster than Valgrind." Go to the drmemory.org. And total...

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QINSB is not a Software Blog | qinsb.blogspot.com Reviews
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QINSB is not a Software Blog. Thursday, November 8, 2012. Funny performance characteristics of DBI tools. These days I'm working on dynamic binary instrumentation (DBI) tools built with DynamoRIO, in particular Dr. Memory. One of the things people always as is, So what's the slowdown? Are you faster than Valgrind? The answer is incredibly complicated, as performance questions usually are. The easy answer is, On SPEC? 10x slowdown, and yes, we are faster than Valgrind. Go to the drmemory.org. And total...
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QINSB is not a Software Blog | qinsb.blogspot.com Reviews

https://qinsb.blogspot.com

QINSB is not a Software Blog. Thursday, November 8, 2012. Funny performance characteristics of DBI tools. These days I'm working on dynamic binary instrumentation (DBI) tools built with DynamoRIO, in particular Dr. Memory. One of the things people always as is, "So what's the slowdown? Are you faster than Valgrind? The answer is incredibly complicated, as performance questions usually are. The easy answer is, "On SPEC? 10x slowdown, and yes, we are faster than Valgrind." Go to the drmemory.org. And total...

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1

QINSB is not a Software Blog: March 2010

http://qinsb.blogspot.com/2010_03_01_archive.html

QINSB is not a Software Blog. Wednesday, March 17, 2010. Hey, this is cool:. Http:/ blog.chromium.org/2010/03/native-client-and-web-portability.html. Http:/ nativeclient.googlecode.com/svn/data/site/pnacl.pdf. I'm not sure) lower things like sizeof(int) in the frontend. Therefore, they claim, it is essentially impossible to compile C and C down to a portable representation. Still, it's a cool project. Links to this post. Subscribe to: Posts (Atom). View my complete profile.

2

QINSB is not a Software Blog: March 2009

http://qinsb.blogspot.com/2009_03_01_archive.html

QINSB is not a Software Blog. Wednesday, March 11, 2009. Blocks," or "lambdas in a non-sexp language". Last week there was a lot of discussion around tav's proposal to add Ruby blocks to Python. Eventually, the proposal went to python-ideas. And got ground into the dust by all of the objections. The idea has been proposed. Consider the Ruby blocks examples on the c2 wiki. Collection.each do element. For x in collection:. Numbers = [1,2,3,4]. Squares = numbers.map { n n*n }. Numbers = [1, 2, 3, 4]. First ...

3

QINSB is not a Software Blog: July 2012

http://qinsb.blogspot.com/2012_07_01_archive.html

QINSB is not a Software Blog. Monday, July 16, 2012. The environment is a command line with a standard format. This isn't particularly deep, but I was playing with start. And totally static ELF exes yesterday, and I had this minor realization about the environment. It lives completely in userspace, and it's basically just a command line with a standard format. Int execve(const char *fname, char * argv, char * envp);. There's really nothing special about envp. You can pass argv. On the other hand, it's a ...

4

QINSB is not a Software Blog: December 2011

http://qinsb.blogspot.com/2011_12_01_archive.html

QINSB is not a Software Blog. Monday, December 12, 2011. Stack crawling in DrMemory without frame pointers or debug info. I work on DrMemory, a dynamic instrumentation tool for finding memory bugs in native apps similar to memcheck, more widely known as just Valgrind. We have to be able to generate stack traces in a wide variety of interesting situations, and we want to do it quickly and without depending on slow, non-portable, and hard to integrate libraries. If we don't have frame pointers, we start wi...

5

QINSB is not a Software Blog: FLAGS dependencies on x86

http://qinsb.blogspot.com/2011/05/flags-dependencies-on-x86.html

QINSB is not a Software Blog. Thursday, May 5, 2011. FLAGS dependencies on x86. You wanted to subtract a constant? Instead of "sub $-1, %rax" try "lea -1(%rax), %rax". Works for add, too. With the more complex base, displacement, index, scale, and offset form of the x86 memory operand, you can get even more fancy, accomplishing small shifts and multiplies and register to register adds using the LEA instruction. You can even get a 3-operand add like so:. Lea 0(%rax, %rbx, 1), %rcx. Cmp %rdi, %rsi. I haven...

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qinsb.blogspot.com qinsb.blogspot.com

QINSB is not a Software Blog

QINSB is not a Software Blog. Thursday, November 8, 2012. Funny performance characteristics of DBI tools. These days I'm working on dynamic binary instrumentation (DBI) tools built with DynamoRIO, in particular Dr. Memory. One of the things people always as is, "So what's the slowdown? Are you faster than Valgrind? The answer is incredibly complicated, as performance questions usually are. The easy answer is, "On SPEC? 10x slowdown, and yes, we are faster than Valgrind." Go to the drmemory.org. And total...

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