1 /* Get the system load averages.
2 Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93, 1994, 1995
3 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20 /* Compile-time symbols that this file uses:
22 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
23 KERNEL_FILE Pathname of the kernel to nlist.
24 LDAV_CVT() Scale the load average from the kernel.
26 LDAV_SYMBOL Name of kernel symbol giving load average.
27 LOAD_AVE_TYPE Type of the load average array in the kernel.
28 Must be defined unless one of
29 apollo, DGUX, NeXT, or UMAX is defined;
30 otherwise, no load average is available.
31 NLIST_STRUCT Include nlist.h, not a.out.h, and
32 the nlist n_name element is a pointer,
34 NLIST_NAME_UNION struct nlist has an n_un member, not n_name.
35 LINUX_LDAV_FILE [__linux__]: File containing load averages.
37 Specific system predefines this file uses, aside from setting
38 default values if not emacs:
41 BSD Real BSD, not just BSD-like.
44 eunice UNIX emulator under VMS.
46 MSDOS No-op for MSDOS.
49 sequent Sequent Dynix 3.x.x (BSD)
50 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
51 sony_news NEWS-OS (works at least for 4.1C)
55 WIN32 No-op for Windows95/NT.
56 __linux__ Linux: assumes /proc filesystem mounted.
57 Support from Michael K. Johnson.
58 __NetBSD__ NetBSD: assumes /kern filesystem mounted.
60 In addition, to avoid nesting many #ifdefs, we internally set
61 LDAV_DONE to indicate that the load average has been computed.
63 We also #define LDAV_PRIVILEGED if a program will require
64 special installation to be able to call getloadavg. */
66 /* This should always be first. */
71 #include <sys/types.h>
73 /* Both the Emacs and non-Emacs sections want this. Some
74 configuration files' definitions for the LOAD_AVE_CVT macro (like
75 sparc.h's) use macros like FSCALE, defined here. */
77 #include <sys/param.h>
81 /* Exclude all the code except the test program at the end
82 if the system has its own `getloadavg' function.
84 The declaration of `errno' is needed by the test program
85 as well as the function itself, so it comes first. */
93 #ifndef HAVE_GETLOADAVG
96 /* The existing Emacs configuration files define a macro called
97 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
98 returns the load average multiplied by 100. What we actually want
99 is a macro called LDAV_CVT, which returns the load average as an
102 For backwards compatibility, we'll define LDAV_CVT in terms of
103 LOAD_AVE_CVT, but future machine config files should just define
104 LDAV_CVT directly. */
106 #if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
107 #define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
110 #if !defined (BSD) && defined (ultrix)
111 /* Ultrix behaves like BSD on Vaxen. */
116 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
117 conflicts with the definition understood in this file, that this
121 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
122 defined to mean that the nlist method should be used, which is not true. */
126 /* Set values that are different from the defaults, which are
127 set a little farther down with #ifndef. */
130 /* Some shorthands. */
132 #if defined (HPUX) && !defined (hpux)
136 #if defined (__hpux) && !defined (hpux)
140 #if defined (__sun) && !defined (sun)
144 #if defined(hp300) && !defined(hpux)
148 #if defined(ultrix) && defined(mips)
152 #if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
156 #if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
158 #include <sys/table.h>
161 #if defined (__osf__) && (defined (mips) || defined (__mips__))
163 #include <sys/table.h>
166 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
167 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
168 that with a couple of other things and we'll have a unique match. */
169 #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
170 #define tek4300 /* Define by emacs, but not by other users. */
174 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
175 #ifndef LOAD_AVE_TYPE
178 #define LOAD_AVE_TYPE long
182 #define LOAD_AVE_TYPE long
186 #define LOAD_AVE_TYPE long
190 #define LOAD_AVE_TYPE long
194 #define LOAD_AVE_TYPE long
198 #define LOAD_AVE_TYPE long
202 #define LOAD_AVE_TYPE long
206 #define LOAD_AVE_TYPE long
210 #define LOAD_AVE_TYPE long
213 #if defined (ardent) && defined (titan)
214 #define LOAD_AVE_TYPE long
218 #define LOAD_AVE_TYPE long
221 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
222 #define LOAD_AVE_TYPE long
226 #define LOAD_AVE_TYPE long
230 #define LOAD_AVE_TYPE double
232 #define LDAV_CVT(n) (n)
236 #endif /* No LOAD_AVE_TYPE. */
239 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
240 according to ghazi@noc.rutgers.edu. */
242 #define FSCALE 1024.0
245 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
246 /* <sys/param.h> defines an incorrect value for FSCALE on an
247 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
255 /* SunOS and some others define FSCALE in sys/param.h. */
258 #define FSCALE 2048.0
261 #if defined(MIPS) || defined(SVR4) || defined(decstation)
265 #if defined (sgi) || defined (sequent)
266 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
267 above under #ifdef MIPS. But we want the sgi value. */
269 #define FSCALE 1000.0
272 #if defined (ardent) && defined (titan)
273 #define FSCALE 65536.0
281 #define FSCALE 65536.0
284 #endif /* Not FSCALE. */
286 #if !defined (LDAV_CVT) && defined (FSCALE)
287 #define LDAV_CVT(n) (((double) (n)) / FSCALE)
290 /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */
309 #if defined (_SEQUENT_) || defined (sequent)
329 #if defined (ardent) && defined (titan)
341 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
349 #endif /* defined (NLIST_STRUCT) */
352 #if defined(sgi) || (defined(mips) && !defined(BSD))
353 #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
357 #if !defined (KERNEL_FILE) && defined (sequent)
358 #define KERNEL_FILE "/dynix"
361 #if !defined (KERNEL_FILE) && defined (hpux)
362 #define KERNEL_FILE "/hp-ux"
365 #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
366 #define KERNEL_FILE "/unix"
370 #if !defined (LDAV_SYMBOL) && defined (alliant)
371 #define LDAV_SYMBOL "_Loadavg"
374 #if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
375 #define LDAV_SYMBOL "avenrun"
384 /* LOAD_AVE_TYPE should only get defined if we're going to use the
386 #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
387 #define LOAD_AVE_TYPE double
395 #else /* NLIST_STRUCT */
397 #endif /* NLIST_STRUCT */
406 #define KERNEL_FILE "/vmunix"
407 #endif /* KERNEL_FILE */
410 #define LDAV_SYMBOL "_avenrun"
411 #endif /* LDAV_SYMBOL */
419 #include <vms/iodef.h>
424 #define LDAV_CVT(n) ((double) (n))
425 #endif /* !LDAV_CVT */
427 #endif /* LOAD_AVE_TYPE */
430 #ifdef HAVE_MACH_MACH_H
431 #include <mach/mach.h>
438 #include <sys/sysmp.h>
444 #include <sys/time.h>
445 #include <sys/wait.h>
446 #include <sys/syscall.h>
449 #include <machine/cpu.h>
450 #include <inq_stats/statistics.h>
451 #include <inq_stats/sysstats.h>
452 #include <inq_stats/cpustats.h>
453 #include <inq_stats/procstats.h>
454 #else /* Not UMAX_43. */
455 #include <sys/sysdefs.h>
456 #include <sys/statistics.h>
457 #include <sys/sysstats.h>
458 #include <sys/cpudefs.h>
459 #include <sys/cpustats.h>
460 #include <sys/procstats.h>
461 #endif /* Not UMAX_43. */
465 #include <sys/dg_sys_info.h>
468 #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
471 #include <sys/file.h>
474 /* Avoid static vars inside a function since in HPUX they dump as pure. */
477 static processor_set_t default_set;
478 static int getloadavg_initialized;
482 static unsigned int cpus = 0;
483 static unsigned int samples;
487 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
491 /* File descriptor open to /dev/kmem or VMS load ave driver. */
493 /* Nonzero iff channel is valid. */
494 static int getloadavg_initialized;
495 /* Offset in kmem to seek to read load average, or 0 means invalid. */
498 #if !defined(VMS) && !defined(sgi)
499 static struct nlist nl[2];
500 #endif /* Not VMS or sgi */
506 #endif /* LOAD_AVE_TYPE */
508 /* Put the 1 minute, 5 minute and 15 minute load averages
509 into the first NELEM elements of LOADAVG.
510 Return the number written (never more than 3, but may be less than NELEM),
511 or -1 if an error occurred. */
514 getloadavg (loadavg, nelem)
518 int elem = 0; /* Return value. */
520 #ifdef NO_GET_LOAD_AVG
522 /* Set errno to zero to indicate that there was no particular error;
523 this function just can't work at all on this system. */
528 #if !defined (LDAV_DONE) && defined (SUNOS_5)
529 /* Use libkstat because we don't have to be root. */
536 if (kc == 0) return -1;
537 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
538 if (ksp == 0 ) return -1;
539 if (kstat_read (kc, ksp, 0) == -1) return -1;
542 kn = kstat_data_lookup (ksp, "avenrun_1min");
545 /* Return -1 if no load average information is available. */
551 loadavg[elem++] = (double) kn->value.ul/FSCALE;
555 kn = kstat_data_lookup (ksp, "avenrun_5min");
558 loadavg[elem++] = (double) kn->value.ul/FSCALE;
562 kn = kstat_data_lookup (ksp, "avenrun_15min");
564 loadavg[elem++] = (double) kn->value.ul/FSCALE;
572 #if !defined (LDAV_DONE) && defined (__linux__)
576 #ifndef LINUX_LDAV_FILE
577 #define LINUX_LDAV_FILE "/proc/loadavg"
584 fd = open (LINUX_LDAV_FILE, O_RDONLY);
587 count = read (fd, ldavgbuf, 40);
592 count = sscanf (ldavgbuf, "%lf %lf %lf",
593 &load_ave[0], &load_ave[1], &load_ave[2]);
597 for (elem = 0; elem < nelem && elem < count; elem++)
598 loadavg[elem] = load_ave[elem];
602 #endif /* __linux__ */
604 #if !defined (LDAV_DONE) && defined (__NetBSD__)
608 #ifndef NETBSD_LDAV_FILE
609 #define NETBSD_LDAV_FILE "/kern/loadavg"
612 unsigned long int load_ave[3], scale;
616 fp = fopen (NETBSD_LDAV_FILE, "r");
619 count = fscanf (fp, "%lu %lu %lu %lu\n",
620 &load_ave[0], &load_ave[1], &load_ave[2],
626 for (elem = 0; elem < nelem; elem++)
627 loadavg[elem] = (double) load_ave[elem] / (double) scale;
631 #endif /* __NetBSD__ */
633 #if !defined (LDAV_DONE) && defined (NeXT)
635 /* The NeXT code was adapted from iscreen 3.2. */
638 struct processor_set_basic_info info;
641 /* We only know how to get the 1-minute average for this system,
642 so even if the caller asks for more than 1, we only return 1. */
644 if (!getloadavg_initialized)
646 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
647 getloadavg_initialized = 1;
650 if (getloadavg_initialized)
652 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
653 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
654 (processor_set_info_t) &info, &info_count)
656 getloadavg_initialized = 0;
660 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
664 if (!getloadavg_initialized)
668 #if !defined (LDAV_DONE) && defined (UMAX)
670 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
671 have a /dev/kmem. Information about the workings of the running kernel
672 can be gathered with inq_stats system calls.
673 We only know how to get the 1-minute average for this system. */
675 struct proc_summary proc_sum_data;
676 struct stat_descr proc_info;
678 register unsigned int i, j;
682 register unsigned int c, i;
683 struct cpu_config conf;
684 struct stat_descr desc;
687 desc.sd_subsys = SUBSYS_CPU;
688 desc.sd_type = CPUTYPE_CONFIG;
689 desc.sd_addr = (char *) &conf;
690 desc.sd_size = sizeof conf;
692 if (inq_stats (1, &desc))
696 for (i = 0; i < conf.config_maxclass; ++i)
698 struct class_stats stats;
699 bzero ((char *) &stats, sizeof stats);
701 desc.sd_type = CPUTYPE_CLASS;
703 desc.sd_addr = (char *) &stats;
704 desc.sd_size = sizeof stats;
706 if (inq_stats (1, &desc))
709 c += stats.class_numcpus;
712 samples = cpus < 2 ? 3 : (2 * cpus / 3);
715 proc_info.sd_next = 0;
716 proc_info.sd_subsys = SUBSYS_PROC;
717 proc_info.sd_type = PROCTYPE_SUMMARY;
718 proc_info.sd_addr = (char *) &proc_sum_data;
719 proc_info.sd_size = sizeof (struct proc_summary);
720 proc_info.sd_sizeused = 0;
722 if (inq_stats (1, &proc_info) != 0)
725 load = proc_sum_data.ps_nrunnable;
727 for (i = samples - 1; i > 0; --i)
729 load += proc_sum_data.ps_nrun[j];
730 if (j++ == PS_NRUNSIZE)
735 loadavg[elem++] = load / samples / cpus;
738 #if !defined (LDAV_DONE) && defined (DGUX)
740 /* This call can return -1 for an error, but with good args
741 it's not supposed to fail. The first argument is for no
742 apparent reason of type `long int *'. */
743 dg_sys_info ((long int *) &load_info,
744 DG_SYS_INFO_LOAD_INFO_TYPE,
745 DG_SYS_INFO_LOAD_VERSION_0);
748 loadavg[elem++] = load_info.one_minute;
750 loadavg[elem++] = load_info.five_minute;
752 loadavg[elem++] = load_info.fifteen_minute;
755 #if !defined (LDAV_DONE) && defined (apollo)
757 /* Apollo code from lisch@mentorg.com (Ray Lischner).
759 This system call is not documented. The load average is obtained as
760 three long integers, for the load average over the past minute,
761 five minutes, and fifteen minutes. Each value is a scaled integer,
762 with 16 bits of integer part and 16 bits of fraction part.
764 I'm not sure which operating system first supported this system call,
765 but I know that SR10.2 supports it. */
767 extern void proc1_$get_loadav ();
768 unsigned long load_ave[3];
770 proc1_$get_loadav (load_ave);
773 loadavg[elem++] = load_ave[0] / 65536.0;
775 loadavg[elem++] = load_ave[1] / 65536.0;
777 loadavg[elem++] = load_ave[2] / 65536.0;
780 #if !defined (LDAV_DONE) && defined (OSF_MIPS)
783 struct tbl_loadavg load_ave;
784 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
786 = (load_ave.tl_lscale == 0
787 ? load_ave.tl_avenrun.d[0]
788 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
789 #endif /* OSF_MIPS */
791 #if !defined (LDAV_DONE) && (defined (MSDOS) || defined (WIN32))
794 /* A faithful emulation is going to have to be saved for a rainy day. */
795 for ( ; elem < nelem; elem++)
801 #if !defined (LDAV_DONE) && defined (OSF_ALPHA)
804 struct tbl_loadavg load_ave;
805 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
806 for (elem = 0; elem < nelem; elem++)
808 = (load_ave.tl_lscale == 0
809 ? load_ave.tl_avenrun.d[elem]
810 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
811 #endif /* OSF_ALPHA */
813 #if !defined (LDAV_DONE) && defined (VMS)
814 /* VMS specific code -- read from the Load Ave driver. */
816 LOAD_AVE_TYPE load_ave[3];
817 static int getloadavg_initialized = 0;
826 /* Ensure that there is a channel open to the load ave device. */
827 if (!getloadavg_initialized)
829 /* Attempt to open the channel. */
831 descriptor.dsc$w_length = 18;
832 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
834 $DESCRIPTOR (descriptor, "LAV0:");
836 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
837 getloadavg_initialized = 1;
840 /* Read the load average vector. */
841 if (getloadavg_initialized
842 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
843 load_ave, 12, 0, 0, 0, 0) & 1))
845 sys$dassgn (channel);
846 getloadavg_initialized = 0;
849 if (!getloadavg_initialized)
853 #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
855 /* UNIX-specific code -- read the average from /dev/kmem. */
857 #define LDAV_PRIVILEGED /* This code requires special installation. */
859 LOAD_AVE_TYPE load_ave[3];
861 /* Get the address of LDAV_SYMBOL. */
866 strcpy (nl[0].n_name, LDAV_SYMBOL);
867 strcpy (nl[1].n_name, "");
868 #else /* NLIST_STRUCT */
869 #ifdef NLIST_NAME_UNION
870 nl[0].n_un.n_name = LDAV_SYMBOL;
871 nl[1].n_un.n_name = 0;
872 #else /* not NLIST_NAME_UNION */
873 nl[0].n_name = LDAV_SYMBOL;
875 #endif /* not NLIST_NAME_UNION */
876 #endif /* NLIST_STRUCT */
880 #if !(defined (_AIX) && !defined (ps2))
881 nlist (KERNEL_FILE, nl)
883 knlist (nl, 1, sizeof (nl[0]))
886 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
888 #ifdef FIXUP_KERNEL_SYMBOL_ADDR
889 FIXUP_KERNEL_SYMBOL_ADDR (nl);
891 offset = nl[0].n_value;
893 #endif /* !SUNOS_5 */
897 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
899 offset = (long) ldav_off & 0x7fffffff;
903 /* Make sure we have /dev/kmem open. */
904 if (!getloadavg_initialized)
907 channel = open ("/dev/kmem", 0);
910 /* Set the channel to close on exec, so it does not
911 litter any child's descriptor table. */
916 (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
918 getloadavg_initialized = 1;
921 /* We pass 0 for the kernel, corefile, and swapfile names
922 to use the currently running kernel. */
923 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
926 /* nlist the currently running kernel. */
928 offset = nl[0].n_value;
929 getloadavg_initialized = 1;
934 /* If we can, get the load average values. */
935 if (offset && getloadavg_initialized)
937 /* Try to read the load. */
939 if (lseek (channel, offset, 0) == -1L
940 || read (channel, (char *) load_ave, sizeof (load_ave))
941 != sizeof (load_ave))
944 getloadavg_initialized = 0;
947 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
948 != sizeof (load_ave))
951 getloadavg_initialized = 0;
956 if (offset == 0 || !getloadavg_initialized)
958 #endif /* LOAD_AVE_TYPE and not VMS */
960 #if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
962 loadavg[elem++] = LDAV_CVT (load_ave[0]);
964 loadavg[elem++] = LDAV_CVT (load_ave[1]);
966 loadavg[elem++] = LDAV_CVT (load_ave[2]);
969 #endif /* !LDAV_DONE && LOAD_AVE_TYPE */
974 /* Set errno to zero to indicate that there was no particular error;
975 this function just can't work at all on this system. */
981 #endif /* ! HAVE_GETLOADAVG */
992 naptime = atoi (argv[1]);
999 errno = 0; /* Don't be misled if it doesn't set errno. */
1000 loads = getloadavg (avg, 3);
1003 perror ("Error getting load average");
1007 printf ("1-minute: %f ", avg[0]);
1009 printf ("5-minute: %f ", avg[1]);
1011 printf ("15-minute: %f ", avg[2]);