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(hp300) && !defined(hpux)
144 #if defined(ultrix) && defined(mips)
148 #if (defined(sun) && defined(SVR4)) || defined (SOLARIS2)
152 #if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
154 #include <sys/table.h>
157 #if defined (__osf__) && (defined (mips) || defined (__mips__))
159 #include <sys/table.h>
162 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
163 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
164 that with a couple of other things and we'll have a unique match. */
165 #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
166 #define tek4300 /* Define by emacs, but not by other users. */
170 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
171 #ifndef LOAD_AVE_TYPE
174 #define LOAD_AVE_TYPE long
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
209 #if defined (ardent) && defined (titan)
210 #define LOAD_AVE_TYPE long
214 #define LOAD_AVE_TYPE long
217 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
218 #define LOAD_AVE_TYPE long
222 #define LOAD_AVE_TYPE long
226 #define LOAD_AVE_TYPE double
228 #define LDAV_CVT(n) (n)
232 #endif /* No LOAD_AVE_TYPE. */
235 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
236 according to ghazi@noc.rutgers.edu. */
238 #define FSCALE 1024.0
241 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
242 /* <sys/param.h> defines an incorrect value for FSCALE on an
243 Alliant FX/2800 Concentrix 2.2, according to ghazi@noc.rutgers.edu. */
251 /* SunOS and some others define FSCALE in sys/param.h. */
254 #define FSCALE 2048.0
257 #if defined(MIPS) || defined(SVR4) || defined(decstation)
261 #if defined (sgi) || defined (sequent)
262 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
263 above under #ifdef MIPS. But we want the sgi value. */
265 #define FSCALE 1000.0
268 #if defined (ardent) && defined (titan)
269 #define FSCALE 65536.0
277 #define FSCALE 65536.0
280 #endif /* Not FSCALE. */
282 #if !defined (LDAV_CVT) && defined (FSCALE)
283 #define LDAV_CVT(n) (((double) (n)) / FSCALE)
286 /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */
305 #if defined (_SEQUENT_) || defined (sequent)
325 #if defined (ardent) && defined (titan)
337 #if defined(alliant) && defined(i860) /* Alliant FX/2800 */
345 #endif /* defined (NLIST_STRUCT) */
348 #if defined(sgi) || (defined(mips) && !defined(BSD))
349 #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
353 #if !defined (KERNEL_FILE) && defined (sequent)
354 #define KERNEL_FILE "/dynix"
357 #if !defined (KERNEL_FILE) && defined (hpux)
358 #define KERNEL_FILE "/hp-ux"
361 #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
362 #define KERNEL_FILE "/unix"
366 #if !defined (LDAV_SYMBOL) && defined (alliant)
367 #define LDAV_SYMBOL "_Loadavg"
370 #if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)) || defined (_AIX))
371 #define LDAV_SYMBOL "avenrun"
380 /* LOAD_AVE_TYPE should only get defined if we're going to use the
382 #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
383 #define LOAD_AVE_TYPE double
391 #else /* NLIST_STRUCT */
393 #endif /* NLIST_STRUCT */
402 #define KERNEL_FILE "/vmunix"
403 #endif /* KERNEL_FILE */
406 #define LDAV_SYMBOL "_avenrun"
407 #endif /* LDAV_SYMBOL */
415 #include <vms/iodef.h>
420 #define LDAV_CVT(n) ((double) (n))
421 #endif /* !LDAV_CVT */
423 #endif /* LOAD_AVE_TYPE */
426 #ifdef HAVE_MACH_MACH_H
427 #include <mach/mach.h>
434 #include <sys/sysmp.h>
440 #include <sys/time.h>
441 #include <sys/wait.h>
442 #include <sys/syscall.h>
445 #include <machine/cpu.h>
446 #include <inq_stats/statistics.h>
447 #include <inq_stats/sysstats.h>
448 #include <inq_stats/cpustats.h>
449 #include <inq_stats/procstats.h>
450 #else /* Not UMAX_43. */
451 #include <sys/sysdefs.h>
452 #include <sys/statistics.h>
453 #include <sys/sysstats.h>
454 #include <sys/cpudefs.h>
455 #include <sys/cpustats.h>
456 #include <sys/procstats.h>
457 #endif /* Not UMAX_43. */
461 #include <sys/dg_sys_info.h>
464 #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
467 #include <sys/file.h>
470 /* Avoid static vars inside a function since in HPUX they dump as pure. */
473 static processor_set_t default_set;
474 static int getloadavg_initialized;
478 static unsigned int cpus = 0;
479 static unsigned int samples;
483 static struct dg_sys_info_load_info load_info; /* what-a-mouthful! */
487 /* File descriptor open to /dev/kmem or VMS load ave driver. */
489 /* Nonzero iff channel is valid. */
490 static int getloadavg_initialized;
491 /* Offset in kmem to seek to read load average, or 0 means invalid. */
494 #if !defined(VMS) && !defined(sgi)
495 static struct nlist nl[2];
496 #endif /* Not VMS or sgi */
502 #endif /* LOAD_AVE_TYPE */
504 /* Put the 1 minute, 5 minute and 15 minute load averages
505 into the first NELEM elements of LOADAVG.
506 Return the number written (never more than 3, but may be less than NELEM),
507 or -1 if an error occurred. */
510 getloadavg (loadavg, nelem)
514 int elem = 0; /* Return value. */
516 #ifdef NO_GET_LOAD_AVG
518 /* Set errno to zero to indicate that there was no particular error;
519 this function just can't work at all on this system. */
524 #if !defined (LDAV_DONE) && defined (SUNOS_5)
525 /* Use libkstat because we don't have to be root. */
532 if (kc == 0) return -1;
533 ksp = kstat_lookup (kc, "unix", 0, "system_misc");
534 if (ksp == 0 ) return -1;
535 if (kstat_read (kc, ksp, 0) == -1) return -1;
538 kn = kstat_data_lookup (ksp, "avenrun_1min");
541 /* Return -1 if no load average information is available. */
547 loadavg[elem++] = (double) kn->value.ul/FSCALE;
551 kn = kstat_data_lookup (ksp, "avenrun_5min");
554 loadavg[elem++] = (double) kn->value.ul/FSCALE;
558 kn = kstat_data_lookup (ksp, "avenrun_15min");
560 loadavg[elem++] = (double) kn->value.ul/FSCALE;
568 #if !defined (LDAV_DONE) && defined (__linux__)
572 #ifndef LINUX_LDAV_FILE
573 #define LINUX_LDAV_FILE "/proc/loadavg"
580 fd = open (LINUX_LDAV_FILE, O_RDONLY);
583 count = read (fd, ldavgbuf, 40);
588 count = sscanf (ldavgbuf, "%lf %lf %lf",
589 &load_ave[0], &load_ave[1], &load_ave[2]);
593 for (elem = 0; elem < nelem && elem < count; elem++)
594 loadavg[elem] = load_ave[elem];
598 #endif /* __linux__ */
600 #if !defined (LDAV_DONE) && defined (__NetBSD__)
604 #ifndef NETBSD_LDAV_FILE
605 #define NETBSD_LDAV_FILE "/kern/loadavg"
608 unsigned long int load_ave[3], scale;
612 fp = fopen (NETBSD_LDAV_FILE, "r");
615 count = fscanf (fp, "%lu %lu %lu %lu\n",
616 &load_ave[0], &load_ave[1], &load_ave[2],
622 for (elem = 0; elem < nelem; elem++)
623 loadavg[elem] = (double) load_ave[elem] / (double) scale;
627 #endif /* __NetBSD__ */
629 #if !defined (LDAV_DONE) && defined (NeXT)
631 /* The NeXT code was adapted from iscreen 3.2. */
634 struct processor_set_basic_info info;
637 /* We only know how to get the 1-minute average for this system,
638 so even if the caller asks for more than 1, we only return 1. */
640 if (!getloadavg_initialized)
642 if (processor_set_default (host_self (), &default_set) == KERN_SUCCESS)
643 getloadavg_initialized = 1;
646 if (getloadavg_initialized)
648 info_count = PROCESSOR_SET_BASIC_INFO_COUNT;
649 if (processor_set_info (default_set, PROCESSOR_SET_BASIC_INFO, &host,
650 (processor_set_info_t) &info, &info_count)
652 getloadavg_initialized = 0;
656 loadavg[elem++] = (double) info.load_average / LOAD_SCALE;
660 if (!getloadavg_initialized)
664 #if !defined (LDAV_DONE) && defined (UMAX)
666 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
667 have a /dev/kmem. Information about the workings of the running kernel
668 can be gathered with inq_stats system calls.
669 We only know how to get the 1-minute average for this system. */
671 struct proc_summary proc_sum_data;
672 struct stat_descr proc_info;
674 register unsigned int i, j;
678 register unsigned int c, i;
679 struct cpu_config conf;
680 struct stat_descr desc;
683 desc.sd_subsys = SUBSYS_CPU;
684 desc.sd_type = CPUTYPE_CONFIG;
685 desc.sd_addr = (char *) &conf;
686 desc.sd_size = sizeof conf;
688 if (inq_stats (1, &desc))
692 for (i = 0; i < conf.config_maxclass; ++i)
694 struct class_stats stats;
695 bzero ((char *) &stats, sizeof stats);
697 desc.sd_type = CPUTYPE_CLASS;
699 desc.sd_addr = (char *) &stats;
700 desc.sd_size = sizeof stats;
702 if (inq_stats (1, &desc))
705 c += stats.class_numcpus;
708 samples = cpus < 2 ? 3 : (2 * cpus / 3);
711 proc_info.sd_next = 0;
712 proc_info.sd_subsys = SUBSYS_PROC;
713 proc_info.sd_type = PROCTYPE_SUMMARY;
714 proc_info.sd_addr = (char *) &proc_sum_data;
715 proc_info.sd_size = sizeof (struct proc_summary);
716 proc_info.sd_sizeused = 0;
718 if (inq_stats (1, &proc_info) != 0)
721 load = proc_sum_data.ps_nrunnable;
723 for (i = samples - 1; i > 0; --i)
725 load += proc_sum_data.ps_nrun[j];
726 if (j++ == PS_NRUNSIZE)
731 loadavg[elem++] = load / samples / cpus;
734 #if !defined (LDAV_DONE) && defined (DGUX)
736 /* This call can return -1 for an error, but with good args
737 it's not supposed to fail. The first argument is for no
738 apparent reason of type `long int *'. */
739 dg_sys_info ((long int *) &load_info,
740 DG_SYS_INFO_LOAD_INFO_TYPE,
741 DG_SYS_INFO_LOAD_VERSION_0);
744 loadavg[elem++] = load_info.one_minute;
746 loadavg[elem++] = load_info.five_minute;
748 loadavg[elem++] = load_info.fifteen_minute;
751 #if !defined (LDAV_DONE) && defined (apollo)
753 /* Apollo code from lisch@mentorg.com (Ray Lischner).
755 This system call is not documented. The load average is obtained as
756 three long integers, for the load average over the past minute,
757 five minutes, and fifteen minutes. Each value is a scaled integer,
758 with 16 bits of integer part and 16 bits of fraction part.
760 I'm not sure which operating system first supported this system call,
761 but I know that SR10.2 supports it. */
763 extern void proc1_$get_loadav ();
764 unsigned long load_ave[3];
766 proc1_$get_loadav (load_ave);
769 loadavg[elem++] = load_ave[0] / 65536.0;
771 loadavg[elem++] = load_ave[1] / 65536.0;
773 loadavg[elem++] = load_ave[2] / 65536.0;
776 #if !defined (LDAV_DONE) && defined (OSF_MIPS)
779 struct tbl_loadavg load_ave;
780 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
782 = (load_ave.tl_lscale == 0
783 ? load_ave.tl_avenrun.d[0]
784 : (load_ave.tl_avenrun.l[0] / (double) load_ave.tl_lscale));
785 #endif /* OSF_MIPS */
787 #if !defined (LDAV_DONE) && (defined (MSDOS) || defined (WIN32))
790 /* A faithful emulation is going to have to be saved for a rainy day. */
791 for ( ; elem < nelem; elem++)
797 #if !defined (LDAV_DONE) && defined (OSF_ALPHA)
800 struct tbl_loadavg load_ave;
801 table (TBL_LOADAVG, 0, &load_ave, 1, sizeof (load_ave));
802 for (elem = 0; elem < nelem; elem++)
804 = (load_ave.tl_lscale == 0
805 ? load_ave.tl_avenrun.d[elem]
806 : (load_ave.tl_avenrun.l[elem] / (double) load_ave.tl_lscale));
807 #endif /* OSF_ALPHA */
809 #if !defined (LDAV_DONE) && defined (VMS)
810 /* VMS specific code -- read from the Load Ave driver. */
812 LOAD_AVE_TYPE load_ave[3];
813 static int getloadavg_initialized = 0;
822 /* Ensure that there is a channel open to the load ave device. */
823 if (!getloadavg_initialized)
825 /* Attempt to open the channel. */
827 descriptor.dsc$w_length = 18;
828 descriptor.dsc$a_pointer = "$$VMS_LOAD_AVERAGE";
830 $DESCRIPTOR (descriptor, "LAV0:");
832 if (sys$assign (&descriptor, &channel, 0, 0) & 1)
833 getloadavg_initialized = 1;
836 /* Read the load average vector. */
837 if (getloadavg_initialized
838 && !(sys$qiow (0, channel, IO$_READVBLK, 0, 0, 0,
839 load_ave, 12, 0, 0, 0, 0) & 1))
841 sys$dassgn (channel);
842 getloadavg_initialized = 0;
845 if (!getloadavg_initialized)
849 #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
851 /* UNIX-specific code -- read the average from /dev/kmem. */
853 #define LDAV_PRIVILEGED /* This code requires special installation. */
855 LOAD_AVE_TYPE load_ave[3];
857 /* Get the address of LDAV_SYMBOL. */
862 strcpy (nl[0].n_name, LDAV_SYMBOL);
863 strcpy (nl[1].n_name, "");
864 #else /* NLIST_STRUCT */
865 #ifdef NLIST_NAME_UNION
866 nl[0].n_un.n_name = LDAV_SYMBOL;
867 nl[1].n_un.n_name = 0;
868 #else /* not NLIST_NAME_UNION */
869 nl[0].n_name = LDAV_SYMBOL;
871 #endif /* not NLIST_NAME_UNION */
872 #endif /* NLIST_STRUCT */
876 #if !(defined (_AIX) && !defined (ps2))
877 nlist (KERNEL_FILE, nl)
879 knlist (nl, 1, sizeof (nl[0]))
882 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
884 #ifdef FIXUP_KERNEL_SYMBOL_ADDR
885 FIXUP_KERNEL_SYMBOL_ADDR (nl);
887 offset = nl[0].n_value;
889 #endif /* !SUNOS_5 */
893 ldav_off = sysmp (MP_KERNADDR, MPKA_AVENRUN);
895 offset = (long) ldav_off & 0x7fffffff;
899 /* Make sure we have /dev/kmem open. */
900 if (!getloadavg_initialized)
903 channel = open ("/dev/kmem", 0);
906 /* Set the channel to close on exec, so it does not
907 litter any child's descriptor table. */
912 (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
914 getloadavg_initialized = 1;
917 /* We pass 0 for the kernel, corefile, and swapfile names
918 to use the currently running kernel. */
919 kd = kvm_open (0, 0, 0, O_RDONLY, 0);
922 /* nlist the currently running kernel. */
924 offset = nl[0].n_value;
925 getloadavg_initialized = 1;
930 /* If we can, get the load average values. */
931 if (offset && getloadavg_initialized)
933 /* Try to read the load. */
935 if (lseek (channel, offset, 0) == -1L
936 || read (channel, (char *) load_ave, sizeof (load_ave))
937 != sizeof (load_ave))
940 getloadavg_initialized = 0;
943 if (kvm_read (kd, offset, (char *) load_ave, sizeof (load_ave))
944 != sizeof (load_ave))
947 getloadavg_initialized = 0;
952 if (offset == 0 || !getloadavg_initialized)
954 #endif /* LOAD_AVE_TYPE and not VMS */
956 #if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
958 loadavg[elem++] = LDAV_CVT (load_ave[0]);
960 loadavg[elem++] = LDAV_CVT (load_ave[1]);
962 loadavg[elem++] = LDAV_CVT (load_ave[2]);
965 #endif /* !LDAV_DONE && LOAD_AVE_TYPE */
970 /* Set errno to zero to indicate that there was no particular error;
971 this function just can't work at all on this system. */
977 #endif /* ! HAVE_GETLOADAVG */
988 naptime = atoi (argv[1]);
995 errno = 0; /* Don't be misled if it doesn't set errno. */
996 loads = getloadavg (avg, 3);
999 perror ("Error getting load average");
1003 printf ("1-minute: %f ", avg[0]);
1005 printf ("5-minute: %f ", avg[1]);
1007 printf ("15-minute: %f ", avg[2]);