[SOLVED] Cse 3100 systems programming lab #7

Part 1. Matrix addition (100 Points). An implementation of matrix ADT (abstract data type) is given in matrix.c. The API (application programming interface) functions that operates on the matrices are listed in matrix.h. One of the functions, addMatrix(), performs matrix addition, which is implemented in matrix.c. In this lab, we implement addMatrix thread() in madd.c.

The function performs matrix addition with two threads. It has the same interface as addMatrix(), but performs matrix addition with two threads. We only need to change madd.c. test-madd.c is provided to test our implementation. The program takes the number of rows and columns from the command line, fills two matrices with random numbers, and compares the result of addMatrix() and addMatrix thread(). If no argument is specified, the program works on matrices of size 6 × 6. In addition, if a command line option -t is present, test-madd prints the time (in seconds) spent on matrix additions, using the average of calls.

Here are some sample sessions of running test-madd. In the second session, the program call the functions 20 times to collect timing information. time1 is the average time on addMatrix() and time2 is the average time on addMatrix thread(). The numbers are likely to change in different runs. $./test-madd Good work! $./test-madd 1000 2000 -t20 Good work! num_runs=20 time1=0.0107 time2=0.0058 speedup=1.8545 Debugging. gdb supports multithreading.

Run your code in gdb until it stops at a breakpoint or appears to stop making progress. If threads are not making progress, interrupt the execution with Ctrl-C to get to the gdb prompt. Here are some commonly used thread commands. • info threads See what threads are running. • thread n Switch to thread n, where n is a thread number. • thread apply [threadno] [all] args Apply commands to one or more threads.