2012-04-26 23:25:54 +00:00
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.\" Copyright (c) 2012 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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intro.1, _exit.2, access.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bind.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, close.2, connect.2, delete_module.2, dup.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, fork.2, fstatat.2, fsync.2, futimesat.2, get_robust_list.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getpagesize.2, getpid.2, getresuid.2, getrlimit.2, getrusage.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, idle.2, init_module.2, intro.2, iopl.2, kcmp.2, kexec_load.2, kill.2, link.2, linkat.2, llseek.2, lookup_dcookie.2, madvise.2, mincore.2, mkdirat.2, mknodat.2, mmap.2, mmap2.2, mount.2, mprotect.2, mq_getsetattr.2, msgctl.2, msgget.2, msgop.2, msync.2, nice.2, open.2, openat.2, pause.2, perfmonctl.2, personality.2, pipe.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, quotactl.2, read.2, readahead.2, readdir.2, readlinkat.2, readv.2, reboot.2, recvmmsg.2, remap_file_pages.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, select.2, select_tut.2, semctl.2, semget.2, semop.2, sendmmsg.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setresuid.2, setuid.2, setup.2, sgetmask.2, shmctl.2, shmget.2, shmop.2, sigaction.2, sigaltstack.2, signal.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, splice.2, stat.2, statfs.2, stime.2, subpage_prot.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, syscalls.2, sysctl.2, sysfs.2, syslog.2, tee.2, time.2, timer_create.2, timer_delete.2, timer_getoverrun.2, timer_settime.2, times.2, tkill.2, umask.2, umount.2, uname.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, abort.3, abs.3, acos.3, acosh.3, adjtime.3, aio_init.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, byteorder.3, bzero.3, catgets.3, catopen.3, cbrt.3, ceil.3, clearenv.3, clock.3, clock_getcpuclockid.3, closedir.3, confstr.3, copysign.3, cos.3, cosh.3, ctermid.3, ctime.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, end.3, endian.3, erf.3, erfc.3, ether_aton.3, euidaccess.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fcloseall.3, fexecve.3, ffs.3, fgetgrent.3, fgetpwent.3, finite.3, flockfile.3, floor.3, fmod.3, fnmatch.3, fopencookie.3, fpathconf.3, fpurge.3, frexp.3, fseeko.3, ftok.3, futimes.3, gcvt.3, get_nprocs_conf.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getifaddrs.3, getipnodebyname.3, getline.3, getlogin.3, getmntent.3, getnetent.3, getnetent_r.3, getopt.3, getprotoent.3, getprotoent_r.3, getpw.3, getpwent.3, getpwnam.3, getrpcent_r.3, gets.3, getservent.3, getservent_r.3, getumask.3, getusershell.3, getutmp.3, getw.3, glob.3, gnu_get_libc_version.3, gsignal.3, hypot.3, if_nameindex.3, if_nametoindex.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, j0.3, ldexp.3, localeconv.3, log.3, log10.3, log1p.3, log2.3, logb.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, mallinfo.3, malloc.3, malloc_get_state.3, malloc_info.3, malloc_stats.3, malloc_trim.3, malloc_usable_size.3, mallopt.3, matherr.3, mcheck.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, on_exit.3, opendir.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, profil.3, psignal.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_cleanup_push_defer_np.3, pthread_create.3, pthread_detach.3, pthread_equal.3, pthread_exit.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_join.3, pthread_kill.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setname_np.3, pthread_setschedparam.3, pthread_setschedprio.3, pthread_sigmask.3, pthread_sigqueue.3, pthread_testcancel.3, pthread_tryjoin_np.3, pthread_yield.3, putenv.3, putpwent.3, puts.3, qecvt.3, qsort.3, raise.3, rand.3, random.3, random_r.3, re_comp.3, readdir.3, realpath.3, regex.3, remainder.3, remove.3, resolver.3, rewinddir.3, rint.3, round.3, scalb.3, scalbln.3, scandir.3, sched_getcpu.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setenv.3, setlocale.3, setlogmask.3, shm_open.3, siginterrupt.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sigwait.3, sin.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdio_ext.3, stpcpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfry.3, strftime.3, string.3, strlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, trunc.3, tsearch.3, ttyslot.3, tzset.3, ulimit.3, undocumented.3, unlocked_stdio.3, usleep.3, y0.3, cpuid.4, full.4, initrd.4, mouse.4, msr.4, sd.4, st.4, acct.5, core.5, services.5, slabinfo.5, aio.7, capabilities.7, credentials.7, feature_test_macros.7, hier.7, inotify.7, libc.7, locale.7, man-pages.7, man.7, math_error.7, mq_overview.7, numa.7, path_resolution.7, pipe.7, pthreads.7, pty.7, rtld-audit.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, suffixes.7, svipc.7, termio.7, time.7, udplite.7, units.7, uri.7, sln.8: s/LICENSE_START(verbatim)/LICENSE_START(VERBATIM)/
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:29:01 +00:00
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.\" %%%LICENSE_START(VERBATIM)
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2012-04-26 23:25:54 +00:00
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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intro.1, _exit.2, access.2, alarm.2, alloc_hugepages.2, arch_prctl.2, bind.2, chdir.2, chmod.2, chown.2, chroot.2, clock_getres.2, clock_nanosleep.2, close.2, connect.2, delete_module.2, dup.2, execve.2, exit_group.2, faccessat.2, fchmodat.2, fchownat.2, fcntl.2, fork.2, fstatat.2, fsync.2, futimesat.2, get_robust_list.2, getdents.2, getdomainname.2, getgid.2, getgroups.2, gethostname.2, getpagesize.2, getpid.2, getresuid.2, getrlimit.2, getrusage.2, gettid.2, gettimeofday.2, getuid.2, getunwind.2, idle.2, init_module.2, intro.2, iopl.2, kcmp.2, kexec_load.2, kill.2, link.2, linkat.2, llseek.2, lookup_dcookie.2, madvise.2, mincore.2, mkdirat.2, mknodat.2, mmap.2, mmap2.2, mount.2, mprotect.2, mq_getsetattr.2, msgctl.2, msgget.2, msgop.2, msync.2, nice.2, open.2, openat.2, pause.2, perfmonctl.2, personality.2, pipe.2, poll.2, posix_fadvise.2, prctl.2, pread.2, process_vm_readv.2, quotactl.2, read.2, readahead.2, readdir.2, readlinkat.2, readv.2, reboot.2, recvmmsg.2, remap_file_pages.2, rename.2, renameat.2, rmdir.2, rt_sigqueueinfo.2, select.2, select_tut.2, semctl.2, semget.2, semop.2, sendmmsg.2, set_tid_address.2, seteuid.2, setfsgid.2, setfsuid.2, setgid.2, setresuid.2, setuid.2, setup.2, sgetmask.2, shmctl.2, shmget.2, shmop.2, sigaction.2, sigaltstack.2, signal.2, sigpending.2, sigprocmask.2, sigreturn.2, sigsuspend.2, sigwaitinfo.2, splice.2, stat.2, statfs.2, stime.2, subpage_prot.2, swapon.2, symlink.2, symlinkat.2, sync.2, sync_file_range.2, syscalls.2, sysctl.2, sysfs.2, syslog.2, tee.2, time.2, timer_create.2, timer_delete.2, timer_getoverrun.2, timer_settime.2, times.2, tkill.2, umask.2, umount.2, uname.2, unlink.2, unlinkat.2, uselib.2, ustat.2, utime.2, utimensat.2, vfork.2, vhangup.2, vm86.2, vmsplice.2, wait.2, wait4.2, write.2, CPU_SET.3, INFINITY.3, abort.3, abs.3, acos.3, acosh.3, adjtime.3, aio_init.3, asin.3, asinh.3, asprintf.3, assert.3, assert_perror.3, atan.3, atan2.3, atanh.3, atexit.3, atof.3, atoi.3, basename.3, bcmp.3, bcopy.3, bindresvport.3, bsd_signal.3, bsearch.3, bstring.3, byteorder.3, bzero.3, catgets.3, catopen.3, cbrt.3, ceil.3, clearenv.3, clock.3, clock_getcpuclockid.3, closedir.3, confstr.3, copysign.3, cos.3, cosh.3, ctermid.3, ctime.3, difftime.3, dirfd.3, div.3, dl_iterate_phdr.3, dprintf.3, drand48.3, drand48_r.3, dysize.3, ecvt.3, ecvt_r.3, end.3, endian.3, erf.3, erfc.3, ether_aton.3, euidaccess.3, exit.3, exp.3, exp10.3, exp2.3, expm1.3, fabs.3, fcloseall.3, fexecve.3, ffs.3, fgetgrent.3, fgetpwent.3, finite.3, flockfile.3, floor.3, fmod.3, fnmatch.3, fopencookie.3, fpathconf.3, fpurge.3, frexp.3, fseeko.3, ftok.3, futimes.3, gcvt.3, get_nprocs_conf.3, getaddrinfo.3, getaddrinfo_a.3, getauxval.3, getcontext.3, getcwd.3, getdate.3, getdirentries.3, getdtablesize.3, getenv.3, getfsent.3, getgrent.3, getgrnam.3, getgrouplist.3, gethostbyname.3, gethostid.3, getifaddrs.3, getipnodebyname.3, getline.3, getlogin.3, getmntent.3, getnetent.3, getnetent_r.3, getopt.3, getprotoent.3, getprotoent_r.3, getpw.3, getpwent.3, getpwnam.3, getrpcent_r.3, gets.3, getservent.3, getservent_r.3, getumask.3, getusershell.3, getutmp.3, getw.3, glob.3, gnu_get_libc_version.3, gsignal.3, hypot.3, if_nameindex.3, if_nametoindex.3, ilogb.3, index.3, inet.3, inet_ntop.3, inet_pton.3, infnan.3, initgroups.3, insque.3, intro.3, isalpha.3, isatty.3, j0.3, ldexp.3, localeconv.3, log.3, log10.3, log1p.3, log2.3, logb.3, lrint.3, lround.3, lsearch.3, lseek64.3, makecontext.3, makedev.3, mallinfo.3, malloc.3, malloc_get_state.3, malloc_info.3, malloc_stats.3, malloc_trim.3, malloc_usable_size.3, mallopt.3, matherr.3, mcheck.3, memccpy.3, memchr.3, memcmp.3, memcpy.3, memfrob.3, memmem.3, memmove.3, memset.3, mkdtemp.3, mkfifo.3, mkfifoat.3, mkstemp.3, mktemp.3, modf.3, mq_close.3, mq_getattr.3, mq_notify.3, mq_open.3, mq_receive.3, mq_send.3, mq_unlink.3, mtrace.3, on_exit.3, opendir.3, posix_fallocate.3, posix_memalign.3, posix_openpt.3, pow.3, pow10.3, profil.3, psignal.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_cleanup_push_defer_np.3, pthread_create.3, pthread_detach.3, pthread_equal.3, pthread_exit.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_join.3, pthread_kill.3, pthread_kill_other_threads_np.3, pthread_self.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setname_np.3, pthread_setschedparam.3, pthread_setschedprio.3, pthread_sigmask.3, pthread_sigqueue.3, pthread_testcancel.3, pthread_tryjoin_np.3, pthread_yield.3, putenv.3, putpwent.3, puts.3, qecvt.3, qsort.3, raise.3, rand.3, random.3, random_r.3, re_comp.3, readdir.3, realpath.3, regex.3, remainder.3, remove.3, resolver.3, rewinddir.3, rint.3, round.3, scalb.3, scalbln.3, scandir.3, sched_getcpu.3, seekdir.3, sem_close.3, sem_destroy.3, sem_getvalue.3, sem_init.3, sem_open.3, sem_post.3, sem_unlink.3, sem_wait.3, setenv.3, setlocale.3, setlogmask.3, shm_open.3, siginterrupt.3, sigpause.3, sigqueue.3, sigset.3, sigsetops.3, sigvec.3, sigwait.3, sin.3, sinh.3, sleep.3, sockatmark.3, sqrt.3, statvfs.3, stdio_ext.3, stpcpy.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strdup.3, strerror.3, strfry.3, strftime.3, string.3, strlen.3, strpbrk.3, strptime.3, strsep.3, strsignal.3, strspn.3, strstr.3, strtok.3, strtol.3, strtoul.3, strverscmp.3, strxfrm.3, swab.3, sysconf.3, syslog.3, system.3, sysv_signal.3, tan.3, tanh.3, tcgetpgrp.3, tcgetsid.3, telldir.3, tempnam.3, timegm.3, timeradd.3, tmpfile.3, tmpnam.3, toascii.3, toupper.3, trunc.3, tsearch.3, ttyslot.3, tzset.3, ulimit.3, undocumented.3, unlocked_stdio.3, usleep.3, y0.3, cpuid.4, full.4, initrd.4, mouse.4, msr.4, sd.4, st.4, acct.5, core.5, services.5, slabinfo.5, aio.7, capabilities.7, credentials.7, feature_test_macros.7, hier.7, inotify.7, libc.7, locale.7, man-pages.7, man.7, math_error.7, mq_overview.7, numa.7, path_resolution.7, pipe.7, pthreads.7, pty.7, rtld-audit.7, sem_overview.7, shm_overview.7, sigevent.7, signal.7, suffixes.7, svipc.7, termio.7, time.7, udplite.7, units.7, uri.7, sln.8: Global fix: Add LICENSE_START(verbatim)
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2013-03-10 09:28:40 +00:00
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.\" %%%LICENSE_END
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2012-04-26 23:25:54 +00:00
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.\"
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_exit.2, dup.2, execve.2, execveat.2, fallocate.2, fcntl.2, get_robust_list.2, getrlimit.2, mbind.2, memfd_create.2, mmap.2, open.2, ptrace.2, readv.2, select.2, sigaction.2, syscall.2, syscalls.2, truncate.2, utimensat.2, write.2, errno.3, exec.3, fclose.3, fexecve.3, fmemopen.3, fopencookie.3, getgrent_r.3, getline.3, getmntent.3, getpw.3, getpwent_r.3, getspnam.3, malloc_info.3, posix_fallocate.3, putgrent.3, shm_open.3, locale.5, proc.5: tstamp
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2015-01-22 22:29:25 +00:00
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.TH MALLOC_INFO 3 2015-01-22 "GNU" "Linux Programmer's Manual"
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2012-04-26 23:25:54 +00:00
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.SH NAME
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malloc_info \- export malloc state to a stream
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.SH SYNOPSIS
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.nf
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.B #include <malloc.h>
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.sp
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2015-01-16 03:18:29 +00:00
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.BI "int malloc_info(int " options ", FILE *" stream );
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2012-04-26 23:25:54 +00:00
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.fi
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.SH DESCRIPTION
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The
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.BR malloc_info ()
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function exports an XML string that describes the current state
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of the memory-allocation
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implementation in the caller.
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The string is printed on the file stream
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2015-01-16 03:18:29 +00:00
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.IR stream .
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2012-04-26 23:25:54 +00:00
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The exported string includes information about all arenas (see
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.BR malloc (3)).
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As currently implemented,
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.I options
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must be zero.
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.SH RETURN VALUE
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On success,
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.BR malloc_info ()
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returns 0;
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2013-04-19 07:18:51 +00:00
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on error, it returns \-1, with
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.I errno
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set to indicate the cause.
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2012-04-26 23:25:54 +00:00
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.SH ERRORS
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.TP
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.B EINVAL
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.I options
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was nonzero.
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.SH VERSIONS
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2013-02-18 11:54:15 +00:00
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.BR malloc_info ()
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2012-04-26 23:25:54 +00:00
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was added to glibc in version 2.10.
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2015-05-13 06:53:46 +00:00
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lb lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR malloc_info ()
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T} Thread safety MT-Safe
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.TE
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2012-04-26 23:25:54 +00:00
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.SH CONFORMING TO
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This function is a GNU extension.
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.SH NOTES
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The memory-allocation information is provided as an XML string
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(rather than a C structure)
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because the information may change over time
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(according to changes in the underlying implementation).
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The output XML string includes a version field.
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2012-04-28 04:41:35 +00:00
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The
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.BR open_memstream (3)
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function can be used to send the output of
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.BR malloc_info ()
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directly into a buffer in memory, rather than to a file.
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2012-04-26 23:25:54 +00:00
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The
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.BR malloc_info ()
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function is designed to address deficiencies in
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.BR malloc_stats (3)
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and
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.BR mallinfo (3).
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.SH EXAMPLE
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The program below takes up to four command-line arguments,
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of which the first three are mandatory.
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The first argument specifies the number of threads that
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the program should create.
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All of the threads, including the main thread,
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allocate the number of blocks of memory specified by the second argument.
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The third argument controls the size of the blocks to be allocated.
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The main thread creates blocks of this size,
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the second thread created by the program allocates blocks of twice this size,
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the third thread allocates blocks of three times this size, and so on.
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The program calls
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.BR malloc_info ()
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twice to display the memory-allocation state.
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The first call takes place before any threads
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are created or memory allocated.
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The second call is performed after all threads have allocated memory.
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In the following example,
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the command-line arguments specify the creation of one additional thread,
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and both the main thread and the additional thread
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allocate 10000 blocks of memory.
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After the blocks of memory have been allocated,
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.BR malloc_info ()
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shows the state of two allocation arenas.
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.in +4
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.nf
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.RB "$ " "getconf GNU_LIBC_VERSION"
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glibc 2.13
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.RB "$ " "./a.out 1 10000 100"
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============ Before allocating blocks ============
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<malloc version="1">
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<heap nr="0">
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<sizes>
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</sizes>
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<total type="fast" count="0" size="0"/>
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<total type="rest" count="0" size="0"/>
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<system type="current" size="135168"/>
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<system type="max" size="135168"/>
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<aspace type="total" size="135168"/>
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<aspace type="mprotect" size="135168"/>
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</heap>
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<total type="fast" count="0" size="0"/>
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<total type="rest" count="0" size="0"/>
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<system type="current" size="135168"/>
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<system type="max" size="135168"/>
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<aspace type="total" size="135168"/>
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<aspace type="mprotect" size="135168"/>
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</malloc>
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============ After allocating blocks ============
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<malloc version="1">
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<heap nr="0">
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<sizes>
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</sizes>
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<total type="fast" count="0" size="0"/>
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<total type="rest" count="0" size="0"/>
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<system type="current" size="1081344"/>
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<system type="max" size="1081344"/>
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<aspace type="total" size="1081344"/>
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<aspace type="mprotect" size="1081344"/>
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</heap>
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<heap nr="1">
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<sizes>
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</sizes>
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<total type="fast" count="0" size="0"/>
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<total type="rest" count="0" size="0"/>
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<system type="current" size="1032192"/>
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<system type="max" size="1032192"/>
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<aspace type="total" size="1032192"/>
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<aspace type="mprotect" size="1032192"/>
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</heap>
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<total type="fast" count="0" size="0"/>
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<total type="rest" count="0" size="0"/>
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<system type="current" size="2113536"/>
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<system type="max" size="2113536"/>
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<aspace type="total" size="2113536"/>
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<aspace type="mprotect" size="2113536"/>
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</malloc>
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.fi
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.in
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.SS Program source
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.nf
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#include <unistd.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <malloc.h>
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#include <errno.h>
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static size_t blockSize;
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static int numThreads, numBlocks;
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#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE); \\
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} while (0)
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static void *
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thread_func(void *arg)
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{
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int j;
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int tn = (int) arg;
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/* The multiplier \(aq(2 + tn)\(aq ensures that each thread (including
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the main thread) allocates a different amount of memory */
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for (j = 0; j < numBlocks; j++)
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if (malloc(blockSize * (2 + tn)) == NULL)
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errExit("malloc\-thread");
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sleep(100); /* Sleep until main thread terminates */
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return NULL;
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}
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int
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main(int argc, char *argv[])
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{
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int j, tn, sleepTime;
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pthread_t *thr;
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if (argc < 4) {
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fprintf(stderr,
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"%s num\-threads num\-blocks block\-size [sleep\-time]\\n",
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argv[0]);
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exit(EXIT_FAILURE);
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}
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numThreads = atoi(argv[1]);
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numBlocks = atoi(argv[2]);
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blockSize = atoi(argv[3]);
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sleepTime = (argc > 4) ? atoi(argv[4]) : 0;
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thr = calloc(numThreads, sizeof(pthread_t));
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if (thr == NULL)
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errExit("calloc");
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printf("============ Before allocating blocks ============\\n");
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malloc_info(0, stdout);
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/* Create threads that allocate different amounts of memory */
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for (tn = 0; tn < numThreads; tn++) {
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errno = pthread_create(&thr[tn], NULL, thread_func,
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(void *) tn);
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if (errno != 0)
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errExit("pthread_create");
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/* If we add a sleep interval after the start\-up of each
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thread, the threads likely won\(aqt contend for malloc
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mutexes, and therefore additional arenas won\(aqt be
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allocated (see malloc(3)). */
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if (sleepTime > 0)
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sleep(sleepTime);
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}
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/* The main thread also allocates some memory */
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2012-05-10 20:13:04 +00:00
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2012-04-26 23:25:54 +00:00
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for (j = 0; j < numBlocks; j++)
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if (malloc(blockSize) == NULL)
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errExit("malloc");
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sleep(2); /* Give all threads a chance to
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complete allocations */
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printf("\\n============ After allocating blocks ============\\n");
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malloc_info(0, stdout);
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exit(EXIT_SUCCESS);
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}
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.fi
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.SH SEE ALSO
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.BR mallinfo (3),
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.BR malloc (3),
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.BR malloc_stats (3),
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2012-04-28 04:41:35 +00:00
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.BR mallopt (3),
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.BR open_memstream (3)
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