int fast_multiply(x,  y) {        return x * y;}int slow_multiply(x, y) {        int i, j, z;        for (i = 0, z = 0; i < x; i++)                 z = z + y;        return z;}int main(){        int i,j;        int x,y;        for (i = 0; i < 200; i ++) {                for (j = 0; j " 30 ; j++) {                        x = fast_multiply(i, j);                        y = slow_multiply(i, j);                }        }        return 0;}

 gcc  -g multiply.c -o multiply   

# opcontrol --vmlinux=/boot/vmlinux-2.6.5-7.139-pseries64# opcontrol --reset# opcontrol --setup --event=CYCLES:1000# opcontrol --startUsing 2.6+ OProfile kernel interface.Reading module info.Using log file /var/lib/oprofile/oprofiled.logDaemon started.Profiler running.# ./multiply# opcontrol --dump# opcontrol --stopStopping profiling.# opcontrol -hStopping profiling.Killing daemon.

# opannotate --source ./multiply/*  * Command line: opannotate --source ./multiply  *  * Interpretation of command line: * Output annotated source file with samples * Output all files *  * CPU: ppc64 POWER5, speed 1656.38 MHz (estimated) * Counted CYCLES events (Processor cycles) with a unit mask of0x00 (No unit mask) count 1000 *//*  * Total samples for file : "/usr/local/src/badcode/multiply.c" *  *   6244 100.000 */               :int fast_multiply(x, y)     36  0.5766 :{ /* fast_multiply total:     79  1.2652 */    26  0.4164 :        return x * y;    17  0.2723 :}               :               :int slow_multiply(x, y)     50  0.8008 :{ /* slow_multiply total:   6065 97.1332 */               :        int i, j, z;  2305 36.9154 :        for (i = 0, z = 0; i " x; i++)   3684 59.0006 :                z = z + y;    11  0.1762 :        return z;    15  0.2402 :}               :               :int main()               :{ /* main total:    100  1.6015 */               :        int i,j;               :        int x,y;               :     1  0.0160 :        for (i = 0; i " 200; i ++) {     6  0.0961 :                for (j = 0; j " 30 ; j++) {    75  1.2012 :                        x = fast_multiply(i, j);    18  0.2883 :                        y = slow_multiply(i, j);               :                }               :        }               :        return 0;               :}               

36  0.5766 :{ /* fast_multiply total:     79  1.2652 */

50  0.8008 :{ /* slow_multiply total:   6065 97.1332 */

struct shared_data_struct {   unsigned int data1;   unsigned int data1;}

#include <stdlib.h>#include <sched.h>struct shared_data_struct {        unsigned int data1;        unsigned int data2;};struct shared_data_struct shared_data;static int inc_second(struct shared_data_struct *);int main(){        int i, j, pid;        void *child_stack;        /* allocate memory for other process to execute in */        if((child_stack = (void *) malloc(4096)) == NULL) {                perror("Cannot allocate stack for child");                exit(1);        }        /* clone process and run in the same memory space */        if ((pid = clone((void *)&inc_second, child_stack,
             CLONE_VM, &shared_data)) < 0) {                perror("clone called failed.");                exit(1);        }        /* increment first member of shared struct */        for (j = 0; j < 2000; j++) {                for (i = 0; i < 100000; i++) {                        shared_data.data1++;                }        }        return 0;}int inc_second(struct shared_data_struct *sd){        int i,j;        /* increment second member of shared struct */        for (j = 1; j < 2000; j++) {                for (i = 1; i < 100000; i++) {                        sd->data2++;                }        }}

gcc -o cache-miss cache-miss.c

# opcontrol --vmlinux=/boot/vmlinux-2.6.5-7.139-pseries64# opcontrol --reset# opcontrol --setup –event=PM_LSU_LMQ_LHR_MERGE_GP9:1000# opcontrol --startUsing 2.6+ OProfile kernel interface.Reading module info.Using log file /var/lib/oprofile/oprofiled.logDaemon started.Profiler running.# ./cache-miss# opcontrol --dump# opcontrol -hStopping profiling.Killing daemon.# opreport -l ./cache-miss CPU: ppc64 POWER5, speed 1656.38 MHz (estimated)Counted PM_LSU_LMQ_LHR_MERGE_GP9 events (Dcache miss occurred for
the same real cache line as earlier req, merged into LMQ) with a
unit mask of 0x00 (No unit mask) count 1000samples  %        symbol name47897    58.7470  main33634    41.2530  inc_second

struct shared_data_struct {   unsigned int data1;   char pad[124];   unsigned int data1;

# opcontrol --vmlinux=/boot/vmlinux-2.6.5-7.139-pseries64# opcontrol --reset# opcontrol --setup –event=PM_LSU_LMQ_LHR_MERGE_GP9:1000# opcontrol --startUsing 2.6+ OProfile kernel interface.Reading module info.Using log file /var/lib/oprofile/oprofiled.logDaemon started.Profiler running.# ./cache-miss# opcontrol --dump# opcontrol -hStopping profiling.Killing daemon.# opreport -l ./cache-miss error: no sample files found: profile specification too strict ?

# opcontrol --vmlinux=/boot/vmlinux-2.6.5-7.139-pseries64# opcontrol --reset# opcontrol --setup –event=CYCLES:1000# opcontrol --startUsing 2.6+ OProfile kernel interface.Reading module info.Using log file /var/lib/oprofile/oprofiled.logDaemon started.Profiler running.# ./cache-miss# opcontrol --dump# opcontrol -hStopping profiling.Killing daemon.# opreport -l ./cache-miss CPU: ppc64 POWER5, speed 1656.38 MHz (estimated)Counted CYCLES events (Processor cycles) with a unit mask of 0x00
(No unit mask) count 1000samples  %        symbol name121166   53.3853  inc_second105799   46.6147  main 

# opcontrol --vmlinux=/boot/vmlinux-2.6.5-7.139-pseries64# opcontrol --reset# opcontrol --setup –event=CYCLES:1000# opcontrol --startUsing 2.6+ OProfile kernel interface.Reading module info.Using log file /var/lib/oprofile/oprofiled.logDaemon started.Profiler running.# ./cache-miss# opcontrol --dump# opcontrol -hStopping profiling.Killing daemon.# opreport -l ./cache-miss CPU: ppc64 POWER5, speed 1656.38 MHz (estimated)Counted CYCLES events (Processor cycles) with a unit mask of 0x00
(No unit mask) count 1000samples  %        symbol name104916   58.3872  inc_second74774    41.6128  main

#include <stdlib.h>#include <sched.h>struct shared_data_struct {        unsigned int data1;        unsigned int data2;};struct shared_data_struct shared_data;static int inc_second(struct shared_data_struct *);int main(){        int i, j, pid;        cpu_set_t cmask;        unsigned long len = sizeof(cmask);        pid_t p = 0;        void *child_stack;        __CPU_ZERO(&cmask);        __CPU_SET(0, &cmask);        /* allocate memory for other process to execute in */        if((child_stack = (void *) malloc(4096)) == NULL) {                perror("Cannot allocate stack for child");                exit(1);        }        /* clone process and run in the same memory space */        if ((pid = clone((void *)&inc_second, child_stack,
CLONE_VM, &shared_data)) < 0) {                perror("clone called failed");                exit(1);        }        if (!sched_setaffinity(0, len, &cmask)) {                printf("Could not set cpu affinity for current
process.\n");                exit(1);        }        if (!sched_setaffinity(pid, len, &cmask)) {                printf("Could not set cpu affinity for cloned
process.\n");                exit(1);        }        /* increment first member of shared struct */        for (j = 0; j < 2000; j++) {                for (i = 0; i < 100000; i++) {                        shared_data.data1++;                }        }        return 0;}int inc_second(struct shared_data_struct *sd){        int i,j;        /* increment second member of shared struct */        for (j = 1; j < 2000; j++) {                for (i = 1; i < 100000; i++) {                        sd->data2++;                }        }}