diff options
Diffstat (limited to 'cpu.c')
| -rw-r--r-- | cpu.c | 157 |
1 files changed, 157 insertions, 0 deletions
@@ -0,0 +1,157 @@ +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include <ctype.h> +#include <stdlib.h> +#include "common.h" + +#define SYSWARNING 30 +#define SYSCRITICAL 50 +#define USRWARNING 80 + +int cpu(int argc, char **argv) { + FILE *f; + char buff[256], *s; + int ncpu=0, extinfo=0, scaleto100=0; + if(argc > 1) { + if(!strcmp(argv[1], "config")) { + s = getenv("scaleto100"); + if(s && !strcmp(s, "yes")) + scaleto100=1; + + if(!(f=fopen("/proc/stat", "r"))) { + fputs("cannot open /proc/stat\n", stderr); + return 1; + } + while(fgets(buff, 256, f)) { + if(!strncmp(buff, "cpu", 3)) { + if(isdigit(buff[3])) + ncpu++; + if(buff[3] == ' ') { + s = strtok(buff+4, " \t"); + for(extinfo=0;strtok(NULL, " \t");extinfo++) + ; + } + } + } + fclose(f); + + if(ncpu < 1 || extinfo < 4) { + fputs("cannot parse /proc/stat\n", stderr); + return 1; + } + + puts("graph_title CPU usage"); + if(extinfo == 7) + puts("graph_order system user nice idle iowait irq softirq"); + else + puts("graph_order system user nice idle"); + if(scaleto100) + puts("graph_args --base 1000 -r --lower-limit 0 --upper-limit 100"); + else + printf("graph_args --base 1000 -r --lower-limit 0 --upper-limit %d\n", 100 * ncpu); + puts("graph_vlabel %\n" + "graph_scale no\n" + "graph_info This graph shows how CPU time is spent.\n" + "graph_category system\n" + "graph_period second\n" + "system.label system\n" + "system.draw AREA"); + printf("system.max %d\n", 100 * ncpu); + puts("system.min 0\n" + "system.type DERIVE"); + printf("system.warning %d\n", SYSWARNING * ncpu); + printf("system.critical %d\n", SYSCRITICAL * ncpu); + puts("system.info CPU time spent by the kernel in system activities\n" + "user.label user\n" + "user.draw STACK\n" + "user.min 0"); + printf("user.max %d\n", 100 * ncpu); + printf("user.warning %d\n", USRWARNING * ncpu); + puts("user.type DERIVE\n" + "user.info CPU time spent by normal programs and daemons\n" + "nice.label nice\n" + "nice.draw STACK\n" + "nice.min 0"); + printf("nice.max %d\n", 100 * ncpu); + puts("nice.type DERIVE\n" + "nice.info CPU time spent by nice(1)d programs\n" + "idle.label idle\n" + "idle.draw STACK\n" + "idle.min 0"); + printf("idle.max %d\n", 100 * ncpu); + puts("idle.type DERIVE\n" + "idle.info Idle CPU time"); + if(scaleto100) + printf("system.cdef system,%d,/\n" + "user.cdef user,%d,/\n" + "nice.cdef nice,%d,/\n" + "idle.cdef idle,%d,/\n", ncpu, ncpu, ncpu, ncpu); + if(extinfo == 7) { + puts("iowait.label iowait\n" + "iowait.draw STACK\n" + "iowait.min 0"); + printf("iowait.max %d\n", 100 * ncpu); + puts("iowait.type DERIVE\n" + "iowait.info CPU time spent waiting for I/O operations to finish\n" + "irq.label irq\n" + "irq.draw STACK\n" + "irq.min 0"); + printf("irq.max %d\n", 100 * ncpu); + puts("irq.type DERIVE\n" + "irq.info CPU time spent handling interrupts\n" + "softirq.label softirq\n" + "softirq.draw STACK\n" + "softirq.min 0"); + printf("softirq.max %d\n", 100 * ncpu); + puts("softirq.type DERIVE\n" + "softirq.info CPU time spent handling \"batched\" interrupts"); + if(scaleto100) + printf("iowait.cdef iowait,%d,/\n" + "irq.cdef irq,%d,/\n" + "softirq.cdef softirq,%d,/\n", ncpu, ncpu, ncpu); + } + return 0; + } + if(!strcmp(argv[1], "autoconf")) { + if(0 == access("/proc/stat", R_OK)) + return writeyes(); + else + return writeno("/proc/stat not readable"); + } + } + if(!(f=fopen("/proc/stat", "r"))) { + fputs("cannot open /proc/stat\n", stderr); + return 1; + } + while(fgets(buff, 256, f)) { + if(!strncmp(buff, "cpu ", 4)) { + fclose(f); + if(!(s = strtok(buff+4, " \t"))) + break; + printf("user.value %s\n", s); + if(!(s = strtok(NULL, " \t"))) + break; + printf("nice.value %s\n", s); + if(!(s = strtok(NULL, " \t"))) + break; + printf("system.value %s\n", s); + if(!(s = strtok(NULL, " \t"))) + break; + printf("idle.value %s\n", s); + if(!(s = strtok(NULL, " \t"))) + return 0; + printf("iowait.value %s\n", s); + if(!(s = strtok(NULL, " \t"))) + return 0; + printf("irq.value %s\n", s); + if(!(s = strtok(NULL, " \t"))) + return 0; + printf("softirq.value %s\n", s); + return 0; + } + } + fclose(f); + fputs("no cpu line found in /proc/stat\n", stderr); + return 1; +} |