StackOverflow2013

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12882910
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0
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0
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2012-10-14T13:58:45.820
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2012-10-14T13:58:45.820
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0
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323249
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12871090
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2
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2
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0
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text
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And of course you can do it in hardcore-way using good old C find_cpu.c <pre><code>#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #define MAX_CHILDREN 100 /** * System command execution output * @param <char> command - system command to execute * @returb <char> execution output */ char *system_output (const char *command) { FILE *pipe; static char out[1000]; pipe = popen (command, "r"); fgets (out, sizeof(out), pipe); pclose (pipe); return out; } /** * Finding all process's children * @param <Int> - process ID * @param <Int> - array of childs */ void find_children (int pid, int children[]) { char empty_command[] = "/bin/ps h -o pid --ppid "; char pid_string[5]; snprintf(pid_string, 5, "%d", pid); char *command = (char*) malloc(strlen(empty_command) + strlen(pid_string) + 1); sprintf(command, "%s%s", empty_command, pid_string); FILE *fp = popen(command, "r"); int child_pid, i = 1; while (fscanf(fp, "%i", &child_pid) != EOF) { children[i] = child_pid; i++; } } /** * Parsign `ps` command output * @param <char> out - ps command output * @return <int> cpu utilization */ float parse_cpu_utilization (const char *out) { float cpu; sscanf (out, "%f", &cpu); return cpu; } int main(void) { unsigned pid = 1; // getting array with process children int process_children[MAX_CHILDREN] = { 0 }; process_children[0] = pid; // parent PID as first element find_children(pid, process_children); // calculating summary processor utilization unsigned i; float common_cpu_usage = 0.0; for (i = 0; i < sizeof(process_children)/sizeof(int); ++i) { if (process_children[i] > 0) { char *command = (char*)malloc(1000); sprintf (command, "/bin/ps -p %i -o 'pcpu' --no-headers", process_children[i]); common_cpu_usage += parse_cpu_utilization(system_output(command)); } } printf("%f\n", common_cpu_usage); return 0; } </code></pre> Compile: <pre><code>gcc -Wall -pedantic --std=gnu99 find_cpu.c </code></pre> Enjoy!
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1. POHow to calculate CPU utilization of a process & all its child processes in Linux?
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1. USSergey Gerasimov
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