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From: Melzzzzz <mel@zzzzz.invalid>
Newsgroups: comp.programming
Subject: Re: Research to Create Automated Buffer Overflow Protection
Date: Tue, 26 Aug 2014 20:16:34 +0200
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On Tue, 26 Aug 2014 18:16:47 +0100
Richard Heathfield <invalid@see.sig.invalid> wrote:

> 
> If you add bounds-checking to C (which is what we're talking about,
> really), (a) you discover eventually that people have already done
> it, and (b) bounds-checking imposes a performance penalty that at
> least some people are not prepared to tolerate.

For example take scimark2 in "go" language:
with bounds checking
 bmaxa@maxa:~/examples/go/src/github.com/bmaxa/sci$ go build -o scimark2
bmaxa@maxa:~/examples/go/src/github.com/bmaxa/sci$ time ./scimark2
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to pozo@nist.gov)     **
**                                                              **
Using       2.00 seconds min time per kernel.
Composite Score:         1060.91
FFT             Mflops:   933.39    (N=1024)
SOR             Mflops:  1235.80    (100 x 100)
MonteCarlo:     Mflops:   179.01
Sparse matmult  Mflops:  1485.93    (N=1000, nz=5000)
LU              Mflops:  1470.43    (M=100, N=100)

real	0m34.279s
user	0m34.232s
sys	0m0.055s
without:
bmaxa@maxa:~/examples/go/src/github.com/bmaxa/sci$ go build -o scimark2 -gcflags -B
bmaxa@maxa:~/examples/go/src/github.com/bmaxa/sci$ time ./scimark2
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to pozo@nist.gov)     **
**                                                              **
Using       2.00 seconds min time per kernel.
Composite Score:         1231.16
FFT             Mflops:  1177.07    (N=1024)
SOR             Mflops:  1258.24    (100 x 100)
MonteCarlo:     Mflops:   168.89
Sparse matmult  Mflops:  1702.12    (N=1000, nz=5000)
LU              Mflops:  1849.46    (M=100, N=100)

real	0m30.569s
user	0m30.531s
sys	0m0.046s

It is 20% faster without bounds checking !



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