Hi recently I had a need to find out the bus bandwidth. The bus had 64 lines and assume that the speed of the bus is xMHz. This implies the bandwidth = (no.of lines) * (speed of each line). Bus Bandwidth = ((64/8)*x*10^6)/(2^20) MBytes/sec. A simple use of this metric is suppose you have SMP(Shared memory processors) with a common bus and the bandwidth of the bus is 1 GBytes/sec and you have several processors which have an (memory) Instruction bandwidth of 250 MBytes/sec you cannot connect more than 4 processors to saturate the bus.

## Tuesday, February 27, 2007

### [Tech] How to determine the bus bandwidth.

## Thursday, February 22, 2007

### [Tech] Pathetic non unix standard matlab editor

Well I'm really pissed of this damn editor (matlab editor) , some how I cannot execute my program .m file from the command line so I had to use this matlab's editor to run my program, after using vi for long this is really pathetic, its more worse than windows I just did ctrl+c and ctrl+v it pased some junk instead of the code which I intended to paste.

## Monday, February 19, 2007

### [SPICE2LAYOUT] 40% Complete

Got back to the SPICE2LAYOUT project updated some Makefiles and added all the skeletal code today. By the mid of the week I should get this up and running, It also needs to have the channel router in that.

Need to get back home and study some stuff for a upcoming Friday jury.

Need to get back home and study some stuff for a upcoming Friday jury.

## Sunday, February 18, 2007

### Algorithm for Permuting in place

Problem: Given a set of numbers S = 1...n and a permutation PI(S), how can you rearrange elements in S in O(n) time with no extra space.

I don't like explaining things just code it., here's code below

The following are testcases

Have Fun.... Vamsi.

I don't like explaining things just code it., here's code below

#include#include #include int a[10]; int b[10]; void ResetArray(){ unsigned int i; for(i=0;i<10;i++){ a[i] = i; } } void swap_elements(unsigned int i,unsigned int j){ int temp; temp = a[i]; a[i] = a[j]; a[j] = temp; } /*b is the swap list*/ void InplacePermute(int *perm){ unsigned int i; for(i=0;i<10;i++){ if(perm[i] < i){ perm[i] = perm[perm[i]]; } if(a[i] < i){ perm[a[i]] = perm[i]; } swap_elements(i,perm[i]); } } void PrintPermutation(void){ unsigned int i; for(i=0;i<10;i++){ printf("%d ",a[i]); } } int main(){ int runs=10; unsigned int i; do{ ResetArray(); printf("Please enter the permutation of size 10, 10 unique digits from 0-9\n"); for(i=0;i<10;i++){ if(scanf("%d",&b[i])<=0){ break; } assert(b[i] >=0 && b[i] <=10); } if(i<10){ break; } InplacePermute(b); printf("The permutation is::"); PrintPermutation(); }while(1); }

The following are testcases

7 3 2 1 4 8 9 0 5 6 8 9 1 2 5 6 7 3 4 0 1 2 3 4 5 6 7 8 0 9 1 3 4 8 9 0 7 6 5 2Well this week has been a little productive, got the space for http://phaedrus.sourceforge.net a library of randomized algorithms

Have Fun.... Vamsi.

## Thursday, February 15, 2007

### Passing multidimensional arrays to functions

Got enlightened by this today. And realized the following.

int a[10][20]; int main(){ print_array(a); /*results in a crash.*/ } void print_array(int **a,int i,int j){ printf("%d",a[i][j]); /*How stupid this can be?*/ }

## Monday, February 12, 2007

### I love PHP

Have been using PHP with apache to build some stuff really like
programming in this I'am in love with PHP.

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